CONTENTS

SECTION 1 GENERAL

Group 1 Safety Hints ---------------------------------------------------------------------------------------------------- 1-1

Group 2 Specifications ------------------------------------------------------------------------------------------------- 1-9

SECTION 2 STRUCTURE AND FUNCTION

Group 1 Pump Device -------------------------------------------------------------------------------------------------- 2-1

Group 2 Main Control Valve ----------------------------------------------------------------------------------------- 2-10
Group 3 Swing Device ------------------------------------------------------------------------------------------------- 2-31
Group 4 Travel Device -------------------------------------------------------------------------------------------------- 2-41
Group 5 RCV Lever ------------------------------------------------------------------------------------------------------ 2-57
Group 6 RCV Pedal ------------------------------------------------------------------------------------------------------ 2-64

SECTION 3 HYDRAULIC SYSTEM

Group 1 Hydraulic Circuit --------------------------------------------------------------------------------------------- 3-1

Group 2 Main Circuit ----------------------------------------------------------------------------------------------------- 3-4
Group 3 Pilot Circuit ------------------------------------------------------------------------------------------------------ 3-7
Group 4 Single Operation -------------------------------------------------------------------------------------------- 3-12
Group 5 Combined Operation ------------------------------------------------------------------------------------- 3-24

SECTION 4 ELECTRICAL SYSTEM

Group 1 Component Location ------------------------------------------------------------------------------------- 4-1

Group 2 Monitoring system ------------------------------------------------------------------------------------------ 4-3
Group 3 Electrical Circuit ---------------------------------------------------------------------------------------------- 4-42
Group 4 Electrical Component Specification ------------------------------------------------------------- 4-59
Group 5 Connectors ----------------------------------------------------------------------------------------------------- 4-66
Group 6 Fault codes ----------------------------------------------------------------------------------------------------- 4-83

SECTION 5 TROUBLESHOOTING

Group 1 Before Troubleshooting ---------------------------------------------------------------------------------- 5-1

Group 2 Hydraulic and Mechanical System --------------------------------------------------------------- 5-4
Group 3 Electrical System ------------------------------------------------------------------------------------------- 5-24
SECTION 6 MAINTENANCE STANDARD

Group 1 Operational Performance Test ----------------------------------------------------------------------- 6-1

Group 2 Major Components ---------------------------------------------------------------------------------------- 6-21
Group 3 Track and Work Equipment ---------------------------------------------------------------------------- 6-30

SECTION 7 DISASSEMBLY AND ASSEMBLY

Group 1 Precaution ------------------------------------------------------------------------------------------------------ 7-1

Group 2 Tightening Torque ------------------------------------------------------------------------------------------ 7-4
Group 3 Pump Device -------------------------------------------------------------------------------------------------- 7-7
Group 4 Main Control Valve ----------------------------------------------------------------------------------------- 7-27
Group 5 Swing Device -------------------------------------------------------------------------------------------------- 7-32
Group 6 Travel Device -------------------------------------------------------------------------------------------------- 7-54
Group 7 RCV Lever ------------------------------------------------------------------------------------------------------ 7-94
Group 8 Turning Joint ---------------------------------------------------------------------------------------------------
7-108
Group 9 Boom, Arm and Bucket Cylinder ------------------------------------------------------------------ 7-113
Group 10 Undercarriage ------------------------------------------------------------------------------------------------ 7-132
Group 11 Work Equipment -------------------------------------------------------------------------------------------- 7-144
 FOREWORD

1. STRUCTURE
This service manual has been prepared as an aid to improve the quality of repairs by giving the
serviceman an accurate understanding of the product and by showing him the correct way to
perform repairs and make judgements. Make sure you understand the contents of this manual and
use it to full effect at every opportunity.
This service manual mainly contains the necessary technical information for operations performed in
a service workshop.
For ease of understanding, the manual is divided into the following sections.

SECTION 1 GENERAL
This section explains the safety hints and gives the specification of the machine and major
components.
SECTION 2 STRUCTURE AND FUNCTION
This section explains the structure and function of each component. It serves not only to give an
understanding of the structure, but also serves as reference material for troubleshooting.
SECTION 3 HYDRAULIC SYSTEM
This section explains the hydraulic circuit, single and combined operation.
SECTION 4 ELECTRICAL SYSTEM
This section explains the electrical circuit, monitoring system and each component. It serves not
only to give an understanding electrical system, but also serves as reference material for trouble
shooting.
SECTION 5 MECHATRONICS SYSTEM
This section explains the computer aided power optimization system and each component.
SECTION 6 TROUBLESHOOTING
This section explains the troubleshooting charts correlating problems to causes.
SECTION 7 MAINTENANCE STANDARD
This section gives the judgement standards when inspecting disassembled parts.
SECTION 8 DISASSEMBLY AND ASSEMBLY
This section explains the order to be followed when removing, installing, disassembling or
assembling each component, as well as precautions to be taken for these operations.
SECTION 9 COMPONENT MOUNTING TORQUE
This section shows bolt specifications and standard torque values needed when mounting
components to the machine.
The specifications contained in this shop manual are subject to change at any time and without any
advance notice. Contact your HYUNDAI distributor for the latest information.

0-1
2. HOW TO READ THE SERVICE MANUAL
Distribution and updating Revised edition mark(೵೶೷…)
Any additions, amendments or other changes will When a manual is revised, an edition mark is
be sent to HYUNDAI distributors. recorded on the bottom outside corner of the
Get the most up-to-date information before you pages.
start any work.
Revisions
Filing method Revised pages are shown at the list of revised
1. See the page number on the bottom of the pages on the between the contents page and
page. section 1 page.
File the pages in correct order.
2. Following examples shows how to read the Symbols
page number. So that the shop manual can be of ample
Example 1 practical use, important places for safety and
2-3 quality are marked with the following symbols.
Item number(2. Structure and
Function)
Consecutive page number for Symbol Item Remarks
each item.
Special safety precautions are
3. Additional pages : Additional pages are necessary when performing the
indicated by a hyphen(-) and number after the work.
Safety
page number. File as in the example. Extra special safety precautions
10 - 4 are necessary when performing
10 - 4 - 1 the work because it is under
Added pages internal pressure.
10 - 4 - 2
10 - 5 Special technical precautions or

੔
other precautions for preserving
Caution
standards are necessary when
performing the work.

0-2
 3. CONVERSION TABLE
Method of using the Conversion Table
The Conversion Table in this section is provided to enable simple conversion of figures. For details of
the method of using the Conversion Table, see the example given below.

Example
1. Method of using the Conversion Table to convert from millimeters to inches
Convert 55mm into inches.
(1) Locate the number 50in the vertical column at the left side, take this as ೛, then draw a
horizontal line from ೛"
(2) Locate the number 5in the row across the top, take this as ೜, then draw a perpendicular line
down from ೜"
(3) Take the point where the two lines cross as ೝ" This point ೝgives the value when converting
from millimeters to inches. Therefore, 55mm = 2.165 inches.

2. Convert 550mm into inches.

(1) The number 550 does not appear in the table, so divide by 10(Move the decimal point one place
to the left) to convert it to 55mm.
(2) Carry out the same procedure as above to convert 55mm to 2.165 inches.
(3) The original value(550mm) was divided by 10, so multiply 2.165 inches by 10(Move the decimal
point one place to the right) to return to the original value.
This gives 550mm = 21.65 inches.

Millimeters to inches ೜
1mm = 0.03937 in

0 1 2 3 4 5 6 7 8 9

0 0.039 0.079 0.118 0.157 0.197 0.236 0.276 0.315 0.354

10 0.394 0.433 0.472 0.512 0.551 0.591 0.630 0.669 0.709 0.748
20 0.787 0.827 0.866 0.906 0.945 0.984 1.024 1.063 1.102 1.142
30 1.181 1.220 1.260 1.299 1.339 1.378 1.417 1.457 1.496 1.536
40 1.575 1.614 1.654 1.693 1.732 1.772 1.811 1.850 1.890 1.929
ೝ
50 1.969 2.008 2.047 2.087 2.126 2.165 2.205 2.244 2.283 2.323
೛
60 2.362 2.402 2.441 2.480 2.520 2.559 2.598 2.638 2.677 2.717
70 2.756 2.795 2.835 2.874 2.913 2.953 2.992 3.032 3.071 3.110
80 3.150 3.189 3.228 3.268 3.307 3.346 3.386 3.425 3.465 3.504
90 3.543 3.583 3.622 3.661 3.701 3.740 3.780 3.819 3.858 3.898

0-3
Millimeters to inches 1mm = 0.03937in

0 1 2 3 4 5 6 7 8 9

0 0.039 0.079 0.118 0.157 0.197 0.236 0.276 0.315 0.354

10 0.394 0.433 0.472 0.512 0.551 0.591 0.630 0.669 0.709 0.748
20 0.787 0.827 0.866 0.906 0.945 0.984 1.024 1.063 1.102 1.142
30 1.181 1.220 1.260 1.299 1.339 1.378 1.417 1.457 1.496 1.536
40 1.575 1.614 1.654 1.693 1.732 1.772 1.811 1.850 1.890 1.929

50 1.969 2.008 2.047 2.087 2.126 2.165 2.205 2.244 2.283 2.323
60 2.362 2.402 2.441 2.480 2.520 2.559 2.598 2.638 2.677 2.717
70 2.756 2.795 2.835 2.874 2.913 2.953 2.992 3.032 3.071 3.110
80 3.150 3.189 3.228 3.268 3.307 3.346 3.386 3.425 3.465 3.504
90 3.543 3.583 3.622 3.661 3.701 3.740 3.780 3.819 3.858 3.898

Kilogram to Pound 1kg = 2.2046lb

0 1 2 3 4 5 6 7 8 9

0 2.20 4.41 6.61 8.82 11.02 13.23 15.43 17.64 19.84

10 22.05 24.25 26.46 28.66 30.86 33.07 35.27 37.48 39.68 41.89
20 44.09 46.30 48.50 50.71 51.91 55.12 57.32 59.5. 61.73 63.93
30 66.14 68.34 70.55 72.75 74.96 77.16 79.37 81.57 83.78 85.98
40 88.18 90.39 92.59 94.80 97.00 99.21 101.41 103.62 105.82 108.03

50 110.23 112.44 114.64 116.85 119.05 121.25 123.46 125.66 127.87 130.07
60 132.28 134.48 136.69 138.89 141.10 143.30 145.51 147.71 149.91 152.12
70 154.32 156.53 158.73 160.94 163.14 165.35 167.55 169.76 171.96 174.17
80 176.37 178.57 180.78 182.98 185.19 187.39 189.60 191.80 194.01 196.21
90 198.42 200.62 202.83 205.03 207.24 209.44 211.64 213.85 216.05 218.26

0-4
Liter to U.S. Gallon 1l = 0.2642 U.S.Gal

0 1 2 3 4 5 6 7 8 9

0 0.264 0.528 0.793 1.057 1.321 1.585 1.849 2.113 2.378

10 2.642 2.906 3.170 3.434 3.698 3.963 4.227 4.491 4.755 5.019
20 5.283 5.548 5.812 6.6076 6.340 6.604 6.869 7.133 7.397 7.661
30 7.925 8.189 8.454 8.718 8.982 9.246 9.510 9.774 10.039 10.303
40 10.567 10.831 11.095 11.359 11.624 11.888 12.152 12.416 12.680 12.944

50 13.209 13.473 13.737 14.001 14.265 14.529 14.795 15.058 15.322 15.586
60 15.850 16.115 16.379 16.643 16.907 17.171 17.435 17.700 17.964 18.228
70 18.492 18.756 19.020 19.285 19.549 19.813 20.077 20.341 20.605 20.870
80 21.134 21.398 21.662 21.926 22.190 22.455 22.719 22.983 23.247 23.511
90 23.775 24.040 24.304 24.568 24.832 25.096 25.631 25.625 25.889 26.153

Liter to U.K. Gallon 1l = 0.21997 U.K.Gal

0 1 2 3 4 5 6 7 8 9

0 0.220 0.440 0.660 0.880 1.100 1.320 1.540 1.760 1.980

10 2.200 2.420 2.640 2.860 3.080 3.300 3.520 3.740 3.950 4.179
20 4.399 4.619 4.839 5.059 5.279 5.499 5.719 5.939 6.159 6.379
30 6.599 6.819 7.039 7.259 7.479 7.969 7.919 8.139 8.359 8.579
40 8.799 9.019 9.239 9.459 9.679 9.899 10.119 10.339 10.559 10.778

50 10.998 11.281 11.438 11.658 11.878 12.098 12.318 12.528 12.758 12.978
60 13.198 13.418 13.638 13.858 14.078 14.298 14.518 14.738 14.958 15.178
70 15.398 15.618 15.838 16.058 16.278 16.498 16.718 16.938 17.158 17.378
80 17.598 17.818 18.037 18.257 18.477 18.697 18.917 19.137 19.357 19.577
90 19.797 20.017 20.237 20.457 20.677 20.897 21.117 21.337 21.557 21.777

0-5
kgf·m to lbf·ft 1kgf·m = 7.233lbf·ft

0 1 2 3 4 5 6 7 8 9

7.2 14.5 21.7 28.9 36.2 43.4 50.6 57.9 65.1

10 72.3 79.6 86.8 94.0 101.3 108.5 115.7 123.0 130.2 137.4
20 144.7 151.9 159.1 166.4 173.6 180.8 188.1 195.3 202.5 209.8
30 217.0 224.2 231.5 238.7 245.9 253.2 260.4 267.6 274.9 282.1
40 289.3 396.6 303.8 311.0 318.3 325.5 332.7 340.0 347.2 354.4

50 361.7 368.9 376.1 383.4 390.6 397.8 405.1 412.3 419.5 426.8
60 434.0 441.2 448.5 455.7 462.9 470.2 477.4 484.6 491.8 499.1
70 506.3 513.5 520.8 528.0 535.2 542.5 549.7 556.9 564.2 571.4
80 578.6 585.9 593.1 600.3 607.6 614.8 622.0 629.3 636.5 643.7
90 651.0 658.2 665.4 672.7 679.9 687.1 694.4 701.6 708.8 716.1

100 723.3 730.5 737.8 745.0 752.2 759.5 766.7 773.9 781.2 788.4
110 795.6 802.9 810.1 817.3 824.6 831.8 839.0 846.3 853.5 860.7
120 868.0 875.2 882.4 889.7 896.9 904.1 911.4 918.6 925.8 933.1
130 940.3 947.5 954.8 962.0 969.2 976.5 983.7 990.9 998.2 10005.4
140 1012.6 1019.9 1027.1 1034.3 1041.5 1048.8 1056.0 1063.2 1070.5 1077.7

150 1084.9 1092.2 1099.4 1106.6 1113.9 1121.1 1128.3 1135.6 1142.8 1150.0
160 1157.3 1164.5 1171.7 1179.0 1186.2 1193.4 1200.7 1207.9 1215.1 1222.4
170 1129.6 1236.8 1244.1 1251.3 1258.5 1265.8 1273.0 1280.1 1287.5 1294.7
180 1301.9 1309.2 1316.4 1323.6 1330.9 1338.1 1345.3 1352.6 1359.8 1367.0
190 1374.3 1381.5 1388.7 1396.0 1403.2 1410.4 1417.7 1424.9 1432.1 1439.4

0-6
kgf/cm2 to lbf/in2 1kgf / cm2 = 14.2233lbf / in2

0 1 2 3 4 5 6 7 8 9

14.2 28.4 42.7 56.9 71.1 85.3 99.6 113.8 128.0

10 142.2 156.5 170.7 184.9 199.1 213.4 227.6 241.8 256.0 270.2
20 284.5 298.7 312.9 327.1 341.4 355.6 369.8 384.0 398.3 412.5
30 426.7 440.9 455.1 469.4 483.6 497.8 512.0 526.3 540.5 554.7
40 568.9 583.2 597.4 611.6 625.8 640.1 654.3 668.5 682.7 696.9

50 711.2 725.4 739.6 753.8 768.1 782.3 796.5 810.7 825.0 839.2
60 853.4 867.6 881.8 896.1 910.3 924.5 938.7 953.0 967.2 981.4
70 995.6 1010 1024 1038 1053 1067 1081 1095 1109 1124
80 1138 1152 1166 1181 1195 1209 1223 1237 1252 1266
90 1280 1294 1309 1323 1337 1351 1365 1380 1394 1408

100 1422 1437 1451 1465 1479 1493 1508 1522 1536 1550
110 1565 1579 1593 1607 1621 1636 1650 1664 1678 1693
120 1707 1721 1735 1749 1764 1778 1792 1806 1821 1835
130 1849 2863 1877 1892 1906 1920 1934 1949 1963 1977
140 1991 2005 2020 2034 2048 2062 2077 2091 2105 2119

150 2134 2148 2162 2176 2190 2205 2219 2233 2247 2262
160 2276 2290 2304 2318 2333 2347 2361 2375 2389 2404
170 2418 2432 2446 2460 2475 2489 2503 2518 2532 2546
180 2560 2574 2589 5603 2617 2631 2646 2660 2674 2688

200 2845 2859 2873 2887 2901 2916 2930 2944 2958 2973
210 2987 3001 3015 3030 3044 3058 3072 3086 3101 3115
220 3129 3143 3158 3172 3186 3200 3214 3229 3243 3257
230 3271 3286 3300 3314 3328 3343 3357 3371 3385 3399
240 3414 3428 3442 3456 3470 3485 3499 3513 3527 3542

0-7
TEMPERATURE
Fahrenheit-Centigrade Conversion.
A simple way to convert a fahrenheit temperature reading into a centigrade temperature reading or vice verse
is to enter the accompanying table in the center or boldface column of figures.
These figures refer to the temperature in either Fahrenheit or Centigrade degrees.
If it is desired to convert from Fahrenheit to Centigrade degrees, consider the center column as a table of
Fahrenheit temperatures and read the corresponding Centigrade temperature in the column at the left.
If it is desired to convert from Centigrade to Fahrenheit degrees, consider the center column as a table of
Centigrade values, and read the corresponding Fahrenheit temperature on the right.

˚C ˚F ˚C ˚F ˚C ˚F ˚C ˚F
-40.4 -40 -40.0 -11.7 11 51.8 7.8 46 114.8 27.2 81 117.8
-37.2 -35 -31.0 -11.1 12 53.6 8.3 47 116.6 27.8 82 179.6
-34.4 -30 -22.0 -10.6 13 55.4 8.9 48 118.4 28.3 83 181.4
-31.7 -25 -13.0 -10.0 14 57.2 9.4 49 120.2 28.9 84 183.2
-28.9 -20 -4.0 -9.4 15 59.0 10.0 50 122.0 29.4 85 185.0

-28.3 -19 -2.2 -8.9 16 60.8 10.6 51 123.8 30.0 86 186.8

-27.8 -18 -0.4 -8.3 17 62.6 11.1 52 125.6 30.6 87 188.6
-27.2 -17 1.4 -7.8 18 64.4 11.7 53 127.4 31.1 88 190.4
-26.7 -16 3.2 -6.7 20 68.0 12.8 55 131.0 32.2 90 194.0
-26.1 -15 5.0 -6.7 20 68.0 12.8 55 131.0 32.2 90 194.0

-25.6 -14 6.8 -6.1 21 69.8 13.3 56 132.8 32.8 91 195.8

-25.0 -13 8.6 -5.6 22 71.6 13.9 57 134.6 33.3 92 197.6
-24.4 -12 10.4 -5.0 23 73.4 14.4 58 136.4 33.9 93 199.4
-23.9 -11 12.2 -4.4 24 75.2 15.0 59 138.2 34.4 94 201.2
-23.3 -10 14.0 -3.9 25 77.0 15.6 60 140.0 35.0 95 203.0

-22.8 -9 15.8 -3.3 26 78.8 16.1 61 141.8 35.6 96 204.8

-22.2 -8 17.6 -2.8 27 80.6 16.7 62 143.6 36.1 97 206.6
-21.7 -7 19.4 -2.2 28 82.4 17.2 63 145.4 36.7 98 208.4
-21.1 -6 21.2 -1.7 29 84.2 17.8 64 147.2 37.2 99 210.2
-20.6 -5 23.0 -1.1 35 95.0 21.1 70 158.0 51.7 125 257.0

-20.0 -4 24.8 -0.6 31 87.8 18.9 66 150.8 40.6 105 221.0

-19.4 -3 26.6 0 32 89.6 19.4 67 152.6 43.3 110 230.0
-18.9 -2 28.4 0.6 33 91.4 20.0 68 154.4 46.1 115 239.0
-18.3 -1 30.2 1.1 34 93.2 20.6 69 156.2 48.9 120 248.0
-17.8 0 32.0 1.7 35 95.0 21.1 70 158.0 51.7 125 257.0

-17.2 1 33.8 2.2 36 96.8 21.7 71 159.8 54.4 130 266.0

-16.7 2 35.6 2.8 37 98.6 22.2 72 161.6 57.2 135 275.0
-16.1 3 37.4 3.3 38 100.4 22.8 73 163.4 60.0 140 284.0
-15.6 4 39.2 3.9 39 102.2 23.3 74 165.2 62.7 145 293.0
-15.0 5 41.0 4.4 40 104.0 23.9 75 167.0 65.6 150 302.0

-14.4 6 42.8 5.0 41 105.8 24.4 76 168.8 68.3 155 311.0

-13.9 7 44.6 5.6 42 107.6 25.0 77 170.6 71.1 160 320.0
-13.3 8 46.4 6.1 43 109.4 25.6 78 172.4 73.9 165 329.0
-12.8 9 48.2 6.7 44 111.2 26.1 79 174.2 76.7 170 338.0
-12.2 10 50.0 7.2 45 113.0 26.7 80 176.0 79.4 172 347.0

0-8
 SECTION 1 GENERAL

Group 1 Safety Hints -------------------- -------------------------------------------------------------------------------- 1-1

Group 2 Specifications ----------------- -------------------------------------------------------------------------------- 1-9
 SECTION 1 GENERAL
GROUP 1 SAFETY

FOLLOW SAFE PROCEDURE

Unsafe wor k practices are dangerous.
Understand service procedure before doing
work; Do not attempt shortcuts.

WEAR PROTECTIVE CLOTHING

Wear close fitting clothing and safety equipment
appropriate to the job.

13031GE01

WARN OTHERS OF SERVICE WORK

Unexpected machine movement can cause
serious injury.
Before performing any work on the excavator,
attach a ਴Do Not Operateਵ tag on the right
side control lever.

13031GE02

USE HANDHOLDS AND STEPS

Falling is one of the major causes of personal
injury.
When you get on and off the machine, always
maintain a three point contact with the steps
and handrails and face the machine. Do not
use any controls as handholds.
Never jump on or off the machine. Never mount
or dismount a moving machine.
Be careful of slippery conditions on platforms, 13031GE03

steps, and handrails when leaving the machine.

1-1
PREPARE FOR EMERGENCIES
Be prepared if a fire starts.
Keep a first aid kit and fire extinguisher handy.
Keep emergency numbers for doctors,
ambulance ser vice, hospital, and fire
department near your telephone.

13031GE04

PROTECT AGAINST FLYING DEBRIS

Guard against injury from flying pieces of metal
or debris; Wear goggles or safety glasses.

13031GE05

PROTECT AGAINST NOISE

Prolonged exposure to loud noise can cause
impairment or loss of hearing.
Wear a suitable hearing protective device such
as earmuffs or earplugs to protect against
objectionable or uncomfortable loud noises.

13031GE06

AVOID POWER LINES

Serious injury or death can result from contact
with electric lines.
Never move any part of the machine or load
closer to electric line than 3m(10ft) plus twice the
line insulator length.

13031GE07

1-2
KEEP RIDERS OFF EXCAVATOR
Only allow the operator on the excavator. Keep
riders off.
Riders on excavator are subject to injury such
as being struck by foreign objects and being
thrown off the excavator. Riders also obstruct
the operator's view resulting in the excavator
being operated in an unsafe manner.
13031GE08

MOVE AND OPERATE MACHINE SAFELY

Bystanders can be run over. Know the location
of bystanders before moving, swinging, or
operating the machine.
Always keep the travel alarm in working
condition. It warns people when the excavator
starts to move.
Use a signal person when moving, swinging, or
operating the machine in congested areas. 13031GE09

Coordinate hand signals before starting the

excavator.

OPERATE ONLY FORM OPERATOR'S SEAT

Avoid possible injury machine damage. Do not
star t engine by shor ting across star ter
terminals.
NEVER start engine while standing on ground.
Start engine only from operator's seat.

13031GE26

PARK MACHINE SAFELY

Before working on the machine:
·Park machine on a level surface.
·Lower bucket to the ground.
·Turn auto idle switch off.
·Run engine at 1/2 speed without load for 2 minutes.
·Turn key switch to OFF to stop engine.
Remove key from switch.
·Move pilot control shutoff lever to locked position.
·Allow engine to cool.

1-3
SUPPORT MACHINE PROPERLY
Always lower the attachment or implement to the
ground before you work on the machine. If you
must work on a lifted machine or attachment,
securely support the machine or attachment.
Do not support the machine on cinder blocks,
hollow tiles, or props that may crumble under
continuous load.
Do not work under a machine that is supported
13031GE10
solely by a jack. Follow recommended
procedures in this manual.

SERVICE COOLING SYSTEM SAFELY

Explosive release of fluids from pressurized
cooling system can cause serious burns.
Shut off engine. Only remove filler cap when
cool enough to touch with bare hands.

13031GE11

HANDLE FLUIDS SAFELY-AVOID FIRES

Handle fuel with care; It is highly flammable.
Do not refuel the machine while smoking or
when near open flame or sparks. Always stop
engine before refueling machine.
Fill fuel tank outdoors.

13031GE12

Store flammable fluids away from fire hazards.

Do not incinerate or puncture pressurized
containers.
Make sure machine is clean of trash, grease,
and debris.
Do not store oily rags; They can ignite and burn
spontaneously.

13031GE13

1-4
BEWARE OF EXHAUST FUMES
Prevent asphyxiation. Engine exhaust fumes
can cause sickness or death.
If you must operate in a building, be positive
there is adequate ventilation. Either use an
exhaust pipe extension to remove the exhaust
fumes or open doors and windows to bring
enough outside air into the area.

REMOVE PAINT BEFORE WELDING OR

HEATING
Avoid potentially toxic fumes and dust.
Hazardous fumes can be generated when paint
is heated by welding, soldering, or using a torch.
Do all work outside or in a well ventilated area.
Dispose of paint and solvent properly.
Remove paint before welding or heating:
· If you sand or grind paint, avoid breathing the dust.
Wear an approved respirator.
· If you use solvent or paint stripper, remove
stripper with soap and water before welding.
Remove solvent or paint stripper containers
13031GE14
and other flammable material from area.
Allow fumes to disperse at least 15 minutes
before welding or heating.

ILLUMINATE WORK AREA SAFELY

Illuminate your work area adequately but safely.
Use a portable safety light for working inside or
under the machine. Make sure the bulb is
enclosed by a wire cage. The hot filament of an
accidentally broken bulb can ignite spilled fuel
or oil.

13031GE15

1-5
SERVICE MACHINE SAFELY
Tie long hair behind your head. Do not wear a
necktie, scarf, loose clothing or necklace when
you work near machine tools or moving parts.
If these items were to get caught, severe injury
could result.
Remove rings and other jewelry to prevent
electrical shorts and entanglement in moving
parts.
13031GE16

STAY CLEAR OF MOVING PARTS

Entanglements in moving parts can cause
serious injury.
To prevent accidents, use care when working
around rotating parts.

13031GE17

AVOID HIGH PRESSURE FLUIDS

Escaping fluid under pressure can penetrate the
skin causing serious injury.
Avoid the hazard by relieving pressure before
disconnecting hydraulic or other lines. Tighten
all connections before applying pressure.
Search for leaks with a piece of cardboard.
Protect hands and body from high pressure
fluids. 13031GE18

If an accident occurs, see a doctor immediately.

Any fluid injected into the skin must be
surgically removed within a few hours or
gangrene may result.

13031GE19

1-6
AVOID HEATING NEAR PRESSURIZED
FLUID LINES
Flammable spray can be generated by heating
near pressurized fluid lines, resulting in severe
burns to yourself and bystanders. Do not heat
by welding, soldering, or using a torch near
pressurized fluid lines or other flammable
materials.
Pressurized lines can be accidentally cut when
13031GE20
heat goes beyond the immediate flame area.
Install fire resisting guards to protect hoses or
other materials.

PREVENT BATTERY EXPLOSIONS

Keep sparks, lighted matches, and flame away
from the top of battery. Battery gas can
explode.
Never check battery charge by placing a metal
object across the posts. Use a volt-meter or
hydrometer.
Do not charge a frozen battery; It may explode.
Warm battery to 16˚C (60˚F). 13031GE21

PREVENT ACID BURNS

Sulfuric acid in battery electrolyte is poisonous. It
is strong enough to burn skin, eat holes in
clothing, and cause blindness if splashed into
eyes.
Avoid the hazard by:
1. Filling batteries in a well-ventilated area.
2. Wearing eye protection and rubber gloves.
3. Avoiding breathing fumes when electrolyte
is added.
4. Avoiding spilling of dripping electrolyte.
5. Use proper jump start procedure.
If you spill acid on yourself:
1. Flush your skin with water.
2. Apply baking soda or lime to help neutralize
the acid.
3. Flush your eyes with water for 10-15
minutes. Get medical attention immediately.
If acid is swallowed:
1. Drink large amounts of water or milk.
13031GE22
2. Then drink milk of magnesia, beaten eggs,
or vegetable oil.
3. Get medical attention immediately.

1-7
USE TOOLS PROPERLY
Use tools appropriate to the work. Makeshift
tools, parts, and procedures can create safety
hazards.
Use power tools only to loosen threaded tools
and fasteners.
For loosening and tightening hardware, use the
c o r r e c t s i ze t o o l s. D O N OT u s e U. S.
measurement tools on metric fasteners. Avoid
bodily injury caused by slipping wrenches.
Use only recommended replacement parts.(aee 13031GE23

Parts catalogue.)

DISPOSE OF FLUIDS PROPERLY

Improperly disposing of fluids can harm the
environment and ecology. Before draining any
fluids, find out the proper way to dispose of
waste from your local environmental agency.
Use proper containers when draining fluids. Do
not use food or beverage containers that may
mislead someone into drinking from them.
DO NOT pour oil into the ground, down a drain,
or into a stream, pond, or lake. Observe
13031GE24
relevant environmental protection regulations
when disposing of oil, fuel, coolant, brake fluid,
filters, batteries, and other harmful waste.

REPLACE SAFETY SIGNS

Replace missing or damaged safety signs. See
the machine operator's manual for correct
safety sign placement.

13031GE25

LIVE WITH SAFETY

Before returning machine to customer, make
sure machine is functioning properly, especially
the safety systems. Install all guards and
shields.

1-8
GROUP 2 SPECIFICATIONS

1. MAJOR COMPONENT

Main control valve

Oil cooler

Radiator

Engine

Main pump

Tooth Bucket Turning joint

Arm cylinder Boom Boom cylinder Swing post Cab Counterweight

Arm Side cutter

Track Carrier roller Sprocket

Bucket cylinder Control link
Idler Track roller Travel motor
Control rod Dozer blade

856A2SP01

1-9
2. SPECIFICATIONS
1) 3.55 m (11' 8") MONO BOOM, 1.75 m (5' 9") ARM WITH BOOM SWING SYSTEM

I(I') D

E
C

G
O
F

H
P
Q
J N
K M
A B(L)
85A2SP02

Description Unit Specification

Operating weight kg (lb) 8530 (18810)
Bucket capacity (SAE heaped), standard m3 (yd3) 0.25 (0.33)
Overall length A 6585 ( 21' 7")
Overall width, with 450 mm shoe B 2300 ( 7' 7")
Overall height C 2560 ( 8' 5")
Superstructure width D 2300 ( 7' 7")
Overall height of cab E 2560 ( 8' 5")
Ground clearance of counterweight F 745 ( 2' 5")
Engine cover height G 1750 ( 5' 9")
Minimum ground clearance H 260 ( 1' 0")
Rear-end distance I 1600 ( 5' 3")
Rear-end swing radius I' 1645 ( 5' 5")
mm (ft-in)
Distance between tumblers (Steel) 2280 ( 7' 6")
J
Distance between tumblers (Rubber) 2270 ( 7' 5")
Undercarriage length (Steel) 2906 ( 9' 6")
K
Undercarriage length (Rubber) 2900 ( 9' 6")
Undercarriage width L 2300 ( 7' 7")
Track gauge M 1850 ( 6' 1")
Track shoe width, standard N 450 ( 1' 6")
Height of blade O 460 ( 1' 6")
Ground clearance of blade up P 430 ( 1' 4")
Depth of blade down Q 410 ( 1' 3")
Travel speed (Low/high) km/hr (mph) 2.7/5.2 (1.7/3.2)
Swing speed rpm 9.5
Gradeability Degree (%) 30 (58)
Ground pressure (450 mm shoe) kgf/cm2 (psi) 0.38 (5.42)

Max traction force kg (lb) 7580 (16700)

1-10
2) 3.55 m (11' 8") MONO BOOM, 2.1 m (6' 11") ARM WITH BOOM SWING SYSTEM

I(I') D

E
C

G
O
F

H
P
Q
J N
K M
A B(L)
85A2SP02

Description Unit Specification

Operating weight kg (lb) 8610 (18980)
Bucket capacity (SAE heaped), standard m3 (yd3) 0.25 (0.33)
Overall length A 6655 ( 21' 10")
Overall width, with 450 mm shoe B 2300 ( 7' 7")
Overall height C 2560 ( 8' 5")
Superstructure width D 2300 ( 7' 7")
Overall height of cab E 2560 ( 8' 5")
Ground clearance of counterweight F 745 ( 2' 5")
Engine cover height G 1750 ( 5' 9")
Minimum ground clearance H 360 ( 1' 2")
Rear-end distance I 1600 ( 5' 3")
Rear-end swing radius I' 1645 ( 5' 5")
mm (ft-in)
Distance between tumblers (Steel) 2280 ( 7' 6")
J
Distance between tumblers (Rubber) 2270 ( 7' 5")
Undercarriage length (Steel) 2906 ( 9' 6")
K
Undercarriage length (Rubber) 2900 ( 9' 6")
Undercarriage width L 2300 ( 7' 7")
Track gauge M 1850 ( 6' 1")
Track shoe width, standard N 450 ( 1' 6")
Height of blade O 460 ( 1' 6")
Ground clearance of blade up P 400 ( 1' 4")
Depth of blade down Q 280 ( 0' 11")
Travel speed (Low/high) km/hr (mph) 2.7/5.2 (1.7/3.2)
Swing speed rpm 9.5
Gradeability Degree (%) 30 (58)
Ground pressure (450 mm shoe) kgf/cm2 (psi) 0.38 (5.47)

Max traction force kg (lb) 7580 (16700)

1-11
3) 3.92 m (12' 1") 2PCS BOOM, 1.75 m (5' 9") ARM WITH BOOM SWING SYSTEM

I(I') D

E
C

G
O
F

H
P
Q
J N
K M
A B(L)
85A2SP02

Description Unit Specification

Operating weight kg (lb) 9000 (19840)
Bucket capacity (SAE heaped), standard m3 (yd3) 0.25 (0.33)
Overall length A 6790 ( 22' 3")
Overall width, with 450 mm shoe B 2300 ( 7' 7")
Overall height C 2560 ( 8' 5")
Superstructure width D 2300 ( 7' 7")
Overall height of cab E 2560 ( 8' 5")
Ground clearance of counterweight F 745 ( 2' 5")
Engine cover height G 1750 ( 5' 9")
Minimum ground clearance H 360 ( 1' 2")
Rear-end distance I 1600 ( 5' 3")
Rear-end swing radius I' 1645 ( 5' 5")
mm (ft-in)
Distance between tumblers (Steel) 2280 ( 7' 6")
J
Distance between tumblers (Rubber) 2270 ( 7' 5")
Undercarriage length (Steel) 2906 ( 9' 6")
K
Undercarriage length (Rubber) 2900 ( 9' 6")
Undercarriage width L 2300 ( 7' 7")
Track gauge M 1850 ( 6' 1")
Track shoe width, standard N 450 ( 1' 6")
Height of blade O 460 ( 1' 6")
Ground clearance of blade up P 400 ( 1' 4")
Depth of blade down Q 280 ( 0' 11")
Travel speed (Low/high) km/hr (mph) 2.7/5.2 (1.7/3.2)
Swing speed rpm 9.5
Gradeability Degree (%) 30 (58)
Ground pressure (450 mm shoe) kgf/cm2 (psi) 0.40 (5.72)

Max traction force kg (lb) 7580 (16700)

1-12
3. WORKING RANGE
1) 3.55 m (11' 8") MONO BOOM, 1.75 m (5' 9") ARM
A
A'
F

D
E
C
B'
B

85A0SP03

Description 1.75 m (5' 9") Arm

Max digging reach A 7090 mm ( 23' 3")

Max digging reach on ground A' 6940 mm ( 22' 9")
Max digging depth B 4290 mm ( 14' 1")
Max digging depth (8ft level) B' 3930 mm ( 12' 11")
Max vertical wall digging depth C 3660 mm ( 12' 0")
Max digging height D 6980 mm ( 22' 11")
Max dumping height E 4950 mm ( 16' 3")
Min swing radius F 2515 mm ( 8' 3")
Boom swing radius (left/right) 70˚/60˚
52.9 kN
SAE 5389 kgf
11882 lbf
Bucket digging force
61.5 kN
ISO 6268 kgf
13819 lbf
39.7 kN
SAE 4042 kgf
8911 lbf
Arm crowd force
41.4 kN
ISO 4222 kgf
9307 lbf

1-13
 2) 3.92 m (12' 10") 2PCS BOOM, 1.75 m (5' 9") ARM

A
A'
F

D
E
C
B'
B

85A0SP03

Description 1.75 m (5' 9") Arm

Max digging reach A 7290 mm ( 23' 11")

Max digging reach on ground A' 7140 mm ( 23' 5")
Max digging depth B 4310 mm ( 14' 2")
Max digging depth (8ft level) B' 4150 mm ( 13' 7")
Max vertical wall digging depth C 3880 mm ( 12' 9")
Max digging height D 7380 mm ( 24' 3")
Max dumping height E 5330 mm ( 17' 6")
Min swing radius F 2475 mm ( 8' 1")
Boom swing radius (left/right) 70˚/60˚
52.9 kN
SAE 5389 kgf
11882 lbf
Bucket digging force
61.5 kN
ISO 6268 kgf
13819 lbf
39.7 kN
SAE 4042 kgf
8911 lbf
Arm crowd force
41.4 kN
ISO 4222 kgf
9307 lbf

1-14
4. WEIGHT
Item kg lb
Upperstructure assembly 4037 8900
Main frame weld assembly 790 1740
Engine assembly 270 600
Main pump assembly 32 70
Main control valve assembly 90 200
Swing motor assembly 80 170
Hydraulic oil tank assembly 76 168
Fuel tank assembly 57 126
Boom swing post 225 500
Counterweight 1006 2220
Cab assembly 332 730
Lower chassis assembly 3210 7080
Track frame weld assembly 858 1890
Swing bearing 155 340
Travel motor assembly 85 190
Turning joint 26 57
Track recoil spring 123 271
Idler 130 290
Carrier roller 14 31
Track roller 160 360
Track-chain assembly (450 mm standard triple grouser shoe) 858 1890
Dozer blade assembly 337 740
Front attachment assembly (3.55 m boom,1.75 m arm, 0.25 m3
1188 2620
SAE heaped bucket)
3.55 m boom assembly 405 890
1.75 m arm assembly 167 370
0.25 m3 SAE heaped bucket 188 410
Boom cylinder assembly 113 249
Arm cylinder assembly 67 150
Bucket cylinder assembly 60 130
Dozer cylinder assembly 64 141
Bucket control link assembly 80 180
Boom swing cylinder assembly 66 150
Angle dozer cylinder assembly 63 139
Dozer cylinder assembly (for angle) 64 141
Adjust cylinder assembly 65 143
Angle blade assembly 485 1070

1-15
5. LIFTING CAPACITIES

Type Boom Arm Counterweight Shoe Wheel Dozer Outtriger

MONO Length [mm] Length [mm] weight [kg] width [mm] width [mm] Front Rear Front Rear
BOOM 3550 1750 1000 450 - Up - - -

· : Rating over-front · : Rating over-side or 360 degree A

Load radius At max. reach

Load point 1.5 m (4.9 ft) 3.0 m (9.8 ft) 4.5 m (14.8 ft) 6.0 m (19.7 ft) Capacity Reach
height
m (ft)

6.0 m kg *2280 *2280 3.21

(19.7 ft) lb *5030 *5030 (10.5)
4.5 m kg *1890 1710 1720 1420 5.02
(14.8 ft) lb *4170 3770 3790 3130 (16.5)
3.0 m kg *2970 *2970 2020 1660 1340 1110 5.81
(9.8 ft) lb *6550 *6550 4450 3660 2950 2450 (19.1)
1.5 m kg 1910 1560 1240 1030 1220 1010 6.06
(4.9 ft) lb 4210 3440 2730 2270 2690 2230 (19.9)
Ground kg 3460 2680 1840 1500 1260 1040 5.87
Line lb 7630 5910 4060 3310 2780 2290 (19.2)
-1.5 m kg *3910 *3910 3490 2710 1840 1490 1520 1240 5.16
(-4.9 ft) lb *8620 *8620 7690 5970 4060 3280 3350 2730 (16.9)
-3.0 m kg *2290 *2290 *1750 *1750 3.57
(-9.8 ft) lb *5050 *5050 *3860 *3860 (11.7)

Note 1. Lifting capacity are based on ISO 10567.

2. Lifting capacity of the HX series does not exceed 75% of tipping load with the machine on firm,
level ground or 87% of full hydraulic capacity.
3. The Lift-point is bucket pivot mounting pin on the arm (without bucket mass).
4. *Indicates load limited by hydraulic capacity.
Lifting capacities are based upon a standard machine conditions.
Lifting capacities will vary with different work tools, ground conditions and attachments.
The difference between the weight of a work tool attachment must be subtracted.
Consult your Hyundai dealer regarding the lifting capacities for specific work tools and attach-
ments.
Failure to comply to the rated load can cause possible personal injury or property damage.
Make adjustments to the rated load as necessory for non-standard configurations.

1-16
 Type Boom Arm Counterweight Shoe Wheel Dozer Outtriger
MONO Length [mm] Length [mm] weight [kg] width [mm] width [mm] Front Rear Front Rear
BOOM 3550 1750 1000 450 - Down - - -

· : Rating over-front · : Rating over-side or 360 degree A

Load radius At max. reach

Load point 1.5 m (4.9 ft) 3.0 m (9.8 ft) 4.5 m (14.8 ft) 6.0 m (19.7 ft) Capacity Reach
height
m (ft)

6.0 m kg *2280 *2280 3.21

(19.7 ft) lb *5030 *5030 (10.5)
4.5 m kg *1890 1860 *1910 1540 5.02
(14.8 ft) lb *4170 4100 *4210 3400 (16.5)
3.0 m kg *2970 *2970 *2140 1800 *1820 1210 5.81
(9.8 ft) lb *6550 *6550 *4720 3970 *4210 2670 (19.1)
1.5 m kg *2620 1700 *1970 1120 *1930 1100 6.06
(4.9 ft) lb *5780 3750 *4340 2470 *4250 2430 (19.9)
Ground kg 3620 2960 *2870 1630 *2010 1130 5.87
Line lb 7980 6530 *6330 3590 *4430 2490 (19.2)
-1.5 m kg *3910 *3910 4210 2990 *2590 1630 *2040 1360 5.16
(-4.9 ft) lb *8620 *8620 9280 6590 *5710 3590 *4500 3000 (16.9)
-3.0 m kg *2290 *2290 *1750 *1750 3.57
(-9.8 ft) lb *5050 *5050 *3860 *3860 (11.7)

1-17
 Type Boom Arm Counterweight Shoe Wheel Dozer Outtriger
2 PCS Length [mm] Length [mm] weight [kg] width [mm] width [mm] Front Rear Front Rear
BOOM 3917 1750 1150 450 - Up - - -

· : Rating over-front · : Rating over-side or 360 degree A

At max. reach
Load point 3.0 m (9.8 ft) 4.5 m (14.8 ft) 6.0 m (19.7 ft) Capacity Reach
height
m (ft)

6.0 m kg *2750 *2750 2440 1980 4.11

(19.7 ft) lb *6060 *6060 5380 4370 (13.5)
4.5 m kg *2580 *2580 2120 1740 1450 1190 5.58
(14.8 ft) lb *5690 *5690 4670 3840 3200 2620 (18.3)
3.0 m kg 2020 1650 1270 1040 1170 960 6.29
(9.8 ft) lb 4450 3640 2800 2290 2580 2120 (20.6)
1.5 m kg 1880 1510 1230 1000 1080 880 6.52
(4.9 ft) lb 4140 3330 2710 2200 2380 1940 (21.4)
Ground kg 1800 1440 1200 970 1110 910 6.34
Line lb 3970 3170 2650 2140 2450 2010 (20.8)
-1.5 m kg *2910 2650 1800 1440 *1300 1060 5.71
(-4.9 ft) lb *6420 5840 3970 3170 *2870 2340 (18.7)
-3.0 m kg
(-9.8 ft) lb

1-18
 Type Boom Arm Counterweight Shoe Wheel Dozer Outtriger
2 PCS Length [mm] Length [mm] weight [kg] width [mm] width [mm] Front Rear Front Rear
BOOM 3917 1750 1150 450 - Down - - -

· : Rating over-front · : Rating over-side or 360 degree A

At max. reach
Load point 3.0 m (9.8 ft) 4.5 m (14.8 ft) 6.0 m (19.7 ft) Capacity Reach
height
m (ft)

6.0 m kg *2750 *2750 *2450 2150 4.11

(19.7 ft) lb *6060 *6060 *5400 4740 (13.5)
4.5 m kg *2580 *2580 *2150 1890 *1960 1300 5.58
(14.8 ft) lb *5690 *5690 *4740 4170 *4320 2870 (18.3)
3.0 m kg *2410 1790 *1860 1140 *1790 1050 6.29
(9.8 ft) lb *5310 3950 *4100 2510 *3950 2310 (20.6)
1.5 m kg *2720 1660 *1900 1100 *1680 970 6.52
(4.9 ft) lb *6000 3660 *4190 2430 *3700 2140 (21.4)
Ground kg *2660 1580 *1770 1070 *1550 990 6.34
Line lb *5860 3480 *3900 2360 *3420 2180 (20.8)
-1.5 m kg *2910 *2910 *2110 1580 *1300 1160 5.71
(-4.9 ft) lb *6420 *6420 *4650 3480 *2870 2560 (18.7)
-3.0 m kg
(-9.8 ft) lb

1-19
 Type Boom Arm Counterweight Shoe Wheel Dozer Outtriger
MONO ANGLE Length [mm] Length [mm] weight [kg] width [mm] width [mm] Front Rear Front Rear
BOOM BLADE 3550 1750 1000 450 - Up - - -

· : Rating over-front · : Rating over-side or 360 degree A

Load radius At max. reach

Load point 1.5 m (4.9 ft) 3.0 m (9.8 ft) 4.5 m (14.8 ft) 6.0 m (19.7 ft) Capacity Reach
height
m (ft)

6.0 m kg *2280 *2280 3.21

(19.7 ft) lb *5030 *5030 (10.5)
4.5 m kg *1890 1740 1740 1450 5.02
(14.8 ft) lb *4170 3840 3840 3200 (16.5)
3.0 m kg *2970 *2970 2040 1690 1360 1130 5.81
(9.8 ft) lb *6550 *6550 4500 3730 3000 2490 (19.1)
1.5 m kg 1940 1590 1260 1050 1240 1030 6.06
(4.9 ft) lb 4280 3510 2780 2310 2730 2270 (19.9)
Ground kg 3510 2730 1870 1520 1280 1060 5.87
Line lb 7740 6020 4120 3350 2820 2340 (19.2)
-1.5 m kg *3910 *3910 3540 2750 1860 1520 1540 1270 5.16
(-4.9 ft) lb *8620 *8620 7800 6060 4100 3350 3400 2800 (16.9)
-3.0 m kg *2290 *2290 *1750 *1750 3.57
(-9.8 ft) lb *5050 *5050 *3860 *3860 (11.7)

1-20
 Type Boom Arm Counterweight Shoe Wheel Dozer Outtriger
MONO ANGLE Length [mm] Length [mm] weight [kg] width [mm] width [mm] Front Rear Front Rear
BOOM BLADE 3550 1750 1000 450 - Down - - -

· : Rating over-front · : Rating over-side or 360 degree A

Load radius At max. reach

Load point 1.5 m (4.9 ft) 3.0 m (9.8 ft) 4.5 m (14.8 ft) 6.0 m (19.7 ft) Capacity Reach
height
m (ft)

6.0 m kg *2280 *2280 3.21

(19.7 ft) lb *5030 *5030 (10.5)
4.5 m kg *1890 1870 *1910 1550 5.02
(14.8 ft) lb *4170 4120 *4210 3420 (16.5)
3.0 m kg *2970 *2970 *2140 1810 *1820 1220 5.81
(9.8 ft) lb *6550 *6550 *4720 3990 *4010 2690 (19.1)
1.5 m kg *2620 1710 *1970 1130 *1930 1110 6.06
(4.9 ft) lb *5780 3770 *4340 2490 *4250 2450 (19.9)
Ground kg *3620 2980 *2870 1650 *2010 1140 5.87
Line lb *7980 6570 *6330 3640 *4430 2510 (19.2)
-1.5 m kg *3910 *3910 *4210 3000 *2590 1640 *2040 1370 5.16
(-4.9 ft) lb *8620 *8620 *9280 6610 *5710 3620 *4500 3020 (16.9)
-3.0 m kg *2290 *2290 *1750 *1750 3.57
(-9.8 ft) lb *5050 *5050 *3860 *3860 (11.7)

1-21
 Type Boom Arm Counterweight Shoe Wheel Dozer Outtriger
2 PCS ANGLE Length [mm] Length [mm] weight [kg] width [mm] width [mm] Front Rear Front Rear
BOOM BLADE 3917 1750 1150 450 - Up - - -

· : Rating over-front · : Rating over-side or 360 degree A

At max. reach
Load point 3.0 m (9.8 ft) 4.5 m (14.8 ft) 6.0 m (19.7 ft) Capacity Reach
height
m (ft)

6.0 m kg *2750 *2750 *2450 2010 4.11

(19.7 ft) lb *6060 *6060 *5400 4430 (13.5)
4.5 m kg *2580 *2580 2150 1760 1470 1210 5.58
(14.8 ft) lb *5690 *5690 4740 3880 3240 2670 (18.3)
3.0 m kg 2050 1670 1290 1060 1190 980 6.29
(9.8 ft) lb 4520 3680 2840 2340 2620 2160 (20.6)
1.5 m kg 1910 1540 1250 1020 1100 900 6.52
(4.9 ft) lb 4210 3400 2760 2250 2430 1980 (21.4)
Ground kg 1830 1470 1220 990 1130 920 6.34
Line lb 4030 3240 2690 2180 2490 2030 (20.8)
-1.5 m kg *2910 2700 1830 1470 *1300 1080 5.71
(-4.9 ft) lb *6420 5950 4030 3240 *2870 2380 (18.7)
-3.0 m kg
(-9.8 ft) lb

1-22
 Type Boom Arm Counterweight Shoe Wheel Dozer Outtriger
2 PCS ANGLE Length [mm] Length [mm] weight [kg] width [mm] width [mm] Front Rear Front Rear
BOOM BLADE 3917 1750 1150 450 - Down - - -

· : Rating over-front · : Rating over-side or 360 degree A

At max. reach
Load point 3.0 m (9.8 ft) 4.5 m (14.8 ft) 6.0 m (19.7 ft) Capacity Reach
height
m (ft)

6.0 m kg *2750 *2750 *2450 2170 4.11

(19.7 ft) lb *6060 *6060 *5400 4780 (13.5)
4.5 m kg *2580 *2580 *2150 1900 *1960 1310 5.58
(14.8 ft) lb *5690 *5690 *4740 4190 *4320 2890 (18.3)
3.0 m kg *2410 1800 *1860 1150 *1790 1060 6.29
(9.8 ft) lb *5310 3970 *4100 2540 *3950 2340 (20.6)
1.5 m kg *2720 1670 *1900 1100 *1680 970 6.52
(4.9 ft) lb *6000 3680 *4190 2430 *3700 2140 (21.4)
Ground kg *2660 1600 *1770 1080 *1550 1000 6.34
Line lb *5860 3530 *3900 2380 *3420 2200 (20.8)
-1.5 m kg *2910 *2910 *2110 1600 *1300 1170 5.71
(-4.9 ft) lb *6420 *6420 *4650 3530 *2870 2580 (18.7)
-3.0 m kg
(-9.8 ft) lb

1-23
6. BUCKET SELECTION GUIDE
1) GENERAL BUCKET

0.25 m3 SAE heaped bucket

Recommendation
Capacity 3.55 m (11' 8") 3.92 m (12' 10")
Width Weight Mono boom Mono boom
SAE CECE 1.75m arm 2.10 m arm 1.75 m arm (5' 2.10 m arm
heaped heaped (5' 9") (6' 11") 9") (6' 11")

0.25 m3 0.21 m3 796 mm 188 kg

(0.33 yd3) (0.27 yd3) (31.3") (414 lb)
● ● ● ◐

※ : Standard bucket
● Applicable for materials with density of 2100 kg/m3 (3540 lb/yd3) or less
◐ Applicable for materials with density of 1800 kg/m3 (3030 lb/yd3) or less
■ Applicable for materials with density of 1500 kg/m3 (2530 lb/yd3) or less
▲ Applicable for materials with density of 1200 kg/m3 (2020 lb/yd3) or less
× Not recommended

1-24
7. UNDERCARRIAGE
1) TRACKS
X-leg type center frame is integrally welded with reinforced box-section track frames. The design
includes dry tracks, lubricated rollers, idlers, sprockets, hydraulic track adjusters with shock absorb-
ing springs and assembled track-type tractor shoes with triple grousers.
2) TYPES OF SHOES
Triple grouser Rubber track

Shapes

Shoe width mm (in) 450 (18) 600 (24) 450 (18)

Operating weight kg (lb) 8530 (18810) 8700 (19810) 8480 (18700)
Ground pressure kgf/cm2 (psi) 0.38 (5.42) 0.29 (4.15) 0.38 (5.38)
Overall width mm (ft-in) 2300 (7' 7") 2390 (7' 10") 2300 (7' 7")

3) NUMBER OF ROLLERS AND SHOES ON EACH SIDE

Item Quantity
Carrier rollers 1 EA
Track rollers 5 EA
Track shoes 40 EA

1-25
8. SPECIFICATIONS FOR MAJOR COMPONENTS
1) ENGINE

Item Specification
Model Yanmar 4TNV98C
Type 4-cycle diesel engine, low emission
Cooling method Water cooling
Number of cylinders and arrangement 4 cylinders, in-line
Firing order 1-3-4-2
Combustion chamber type Direct injection type
Cylinder bore×stroke 98×110 mm (3.86"×4.33")
Piston displacement 3319 cc (203 cu in)
Compression ratio 18.3:1
Rated gross horse power (SAE J1995) 66.9 Hp at 2400 rpm (49.9 kW at 2400 rpm)
Maximum torque at 1350 rpm 24.6 kgf·m (178 lbf·ft)
Engine oil quantity 10.5ℓ(2.8 U.S. gal)
Dry weight 278 kg (610 lb)
High idling speed 2550±50 rpm
Low idling speed 1000±50 rpm
Rated fuel consumption 233 g/Hp·hr at 2400 rpm
Starting motor 12 V-3 kW
Alternator 12 V-100 A
Battery 1×12 V×100 Ah

2) MAIN PUMP
Item Specification
Type Variable displacement piston pumps
Capacity 72 cc/rev
Maximum pressure 280 kgf/cm2 (3980 psi)
Rated oil flow 144ℓ/min (38 U.S.gpm)
Rated speed 2000 rpm

1-26
 4) GEAR PUMP (P4)

Item Specification
Type Fixed displacement gear pump single stage
Capacity 8 cc/rev
Maximum pressure 34 kgf/cm2 (479 psi)
Rated oil flow 16ℓ/min (4.5 U.S.gpm/3.5 U.K.gpm)

5) MAIN CONTROL VALVE

Item Specification
Type 9 spools sectional inline
Operating method Hydraulic pilot system
Main relief valve pressure 280 kgf/cm2 (3980psi)
Overload relief valve pressure 310 kgf/cm2 (4410psi)

6) SWING MOTOR

Item Specification
Type Axial piston motor
Capacity 43.4 cc/rev
Relief pressure 245 kgf/cm2 (3485 psi)
Braking system Automatic, spring applied hydraulic released
Braking torque 17 kgf·m (123 lbf·ft)
Brake release pressure 25~50 kgf/cm2 (356~711 psi)
Reduction gear type 2 - stage planetary

7) TRAVEL MOTOR

Item Specification
Type Variable displacement axial piston motor
Relief pressure 286 kgf/cm2 (4068 psi)
Reduction gear type 2 stage planetary
Braking system Automatic, spring applied hydraulic released
Brake release pressure 6.4 kgf/cm2 (91 psi)
Braking torque 18.5 kgf·m (134 lbf·ft)

1-27
 8) CYLINDER
Item Specification
Bore dia×Rod dia×Stroke Ø120×Ø70×865 mm
Boom cylinder
Cushion Extend only
Bore dia×Rod dia×Stroke Ø100×Ø60×860 mm
Arm cylinder
Cushion Extend and retract
Bore dia×Rod dia×Stroke Ø90×Ø55×685 mm
Bucket cylinder
Cushion Extend only
Bore dia×Rod dia×Stroke Ø130×Ø70×190 mm
Dozer cylinder
Cushion -
Bore dia×Rod dia×Stroke Ø110×Ø60×707 mm
Boom swing cylinder
Cushion -
Dozer cylinder (Angle) Bore dia×Rod dia×Stroke Ø140×Ø70×180 mm
Angle dozer cylinder Cushion Ø100×Ø60×461 mm

※ Discoloration of cylinder rod can occur when the friction reduction additive of lubrication oil spreads on
the rod surface.
※ Discoloration does not cause any harmful effect on the cylinder performance.
※ 2PCS Boom cylinder / Bore dia ×Rod Rod dia×Stroke
dia Stroke / Ø95×Ø55×550 mm

9) SHOE

Item Width Ground pressure Link quantity Overall width

450 mm (18") 0.38 kgf/cm2 (5.42 psi) 40 2300 mm ( 7' 7")
Steel
600 mm (24") 0.29 kgf/cm2 (4.15 psi) 40 2390 mm ( 7' 10")
Rubber 450 mm (18") 0.38 kgf/cm2 (5.38 psi) - 2300 mm ( 7' 7")

10) BUCKET
Item Capacity Tooth Width
SAE heaped CECE heaped quantity Without side cutter With side cutter
STD 0.25 m3 (0.33yd3) 0.21 m3 (0.27yd3) 4 730 mm (28.7") 800 mm (31.5")

1-28
9. RECOMMENDED OILS
HYUNDAI genuine lubricating oils have been developed to offer the best performance and service life for
your equipment. These oils have been tested according to the specifications of HYUNDAI and, therefore, will
meet the highest safety and quality requirements.
We recommend that you use only HYUNDAI genuine lubricating oils and grease officially approved by
HYUNDAI.
Ambient temperature˚C(˚F)
Capacity
Service point Kind of fluid
ℓ (U.S. gal) -50 -30 -20 -10 0 10 20 30 40
(-58) (-22) (-4) (14) (32) (50) (68) (86) (104)

★SAE 5W-40

SAE 30
Engine
Engine oil 10.5 (2.8) SAE 10W
oil pan
SAE 10W-30

SAE 15W-40

★SAE 75W-90
1.1×2
Final drive Gear oil (0.3×2) SAE 80W-90

★ISO VG 15
Tank;
56 (14.8) ISO VG 32
Hydraulic
Hydraulic oil
tank
System; ISO VG 46, HBHO VG 46★3
109 (28.8)
ISO VG 68

★ASTM D975 NO.1

Fuel tank Diesel fuel★1 115 (30.4)
ASTM D975 NO.2

Fitting ★NLGI NO.1

Grease As required
(grease nipple) NLGI NO.2

Mixture of
Radiator Ethylene glycol base permanent type
antifreeze
(reservoir 13 (3.4)
and water ★Ethylene glycol base permanent type (60 : 40)
tank)
50 : 50★2
SAE : Society of Automotive Engineers ★ : Cold region (Russia, CIS, Mongolia)
API : American Petroleum Institute ★1 : Ultra low sulfur diesel
ISO : International Organization for Standardization - sulfur content  15 ppm
NLGI : National Lubricating Grease Institute ★2 : Soft water : City water or distilled water
ASTM : American Society of Testing and Material ★3 : Hyundai Bio Hydrauilc Oil

※ Using any lubricating oils other than HYUNDAI genuine products may lead to a deterioration of performance
and cause damage to major components.
※ Do not mix HYUNDAI genuine oil with any other lubricating oil as it may result in damage to the systems of
major components.
※ Do not use any engine oil other than that specified above, as it may clog the diesel particulate filter(DPF).
※ For HYUNDAI genuine lubricating oils and grease for use in regions with extremely low temperatures, please
contact HYUNDAI dealers.

1-29
 SECTION 2 STRUCTURE AND FUNCTION
Group 1 Pump Device -------------------------------------------------------------------------------------------------- 2-1
Group 2 Main Control Valve ----------------------------------------------------------------------------------------- 2-10
Group 3 Swing Device ------------------------------------------------------------------------------------------------- 2-31
Group 4 Travel Device -------------------------------------------------------------------------------------------------- 2-41
Group 5 RCV Lever ------------------------------------------------------------------------------------------------------ 2-57
Group 6 RCV Pedal ------------------------------------------------------------------------------------------------------ 2-64
 GROUP 1 HYDRAULIC PUMP

1. GENERAL
This variable displacement piston pump consists of main pump and pilot pump.

X B1
LS V/V

PC V/V

B1 G

B2

S L2 L1 L S
Hydraulic circuit

L1

L B2

L2

85A2MP01

Description of the ports

Port Name Bore
S1 Suction port SAE 2"
B1 Discharge port SAE 1"
B2 Discharge port PF7/8-14UNF
G High pressure port M10x1
X Pilot pressure port PF7/16-20UNF
L, L1, L2 Case drain port PF7/8-14UNF

2-1
2. START OF POWER CONTROL
Setting of starting point in P-Q curve shall be carried out as per following conditions and procedures.
1) CONDITIONS
(1) Engine shall be running at 2000 rpm.
(2) Oil temperature shall be adjusted at 40 ℃.
(3) Pressure gauges and a flow meter shall be installed.

Elec proportional relief valve

Flow meter

LS V/V

PC V/V

Main pressure to G port

for high torque
B1 G

S L2 L1 L

Schematic circuit 85A2MP10

220 bar Nut 1

240 bar 94 l/min Nut 3
80 l/min
Nut 2 Cap nut
Torque (Nm)
Pressure (bar)

170 bar
123 l/min

Hex screw

Displacement (l/min)

P-Q curve Pump schematic drawing

85A2MP11

2-2
 2) PROCEDURES
(1) Loosen nut 1 fixing nut 2.
(2) Adjust outer spring by tightening or loosening nut 2.
① Increase pressure up to 170 bar.
② Turn Nut 2 clockwise to increase power until pumping flow reaches 123 ℓ/min (±4 ℓ/min).
(3) Secure the setting of nut 2 by tightening nut 1.

3) CHANGE OF P-Q CURVE

(1) If length of outer spring is decreased by tightening nut 2, the P-Q curve is moved to right in
general like a graph left under as the spring tension is increased.
(2) If length of outer spring is increased by loosening nut 2, the P-Q curve is moved to left in general
like a graph right under as the spring tension is decreased.
OUTPUT FLOW, Q

OUTPUT FLOW, Q

OUTPUT PRESSURE, P OUTPUT PRESSURE, P

85A2MP12

3. END OF POWER CONTROL

Setting of ending point in P-Q curve shall be carried out following procedures and conditions.
1) CONDITIONS
(1) The conditions shall be set same as above.
2) PROCEDURES
(1) Loosen the nut 3.
(2) Set end of control by turning Hexagonal screw.
① Increase pressure to 220 bar.
② Turn Screw clockwise to increase power until 92 ℓ /min (±4ℓ /min) is reached.
(3) Secure the setting of nut 3.
(4) Tighten Cap nut.

2-3
 3) CHANGE OF P-Q CURVE
(1) If length of Inner spring is deceased by tightening hexagonal screw, lower part of P-Q curve is
moved to right like a graph left under as the tension force of spring is increased.
(2) If length of Inner spring is increased by loosening hexagonal screw, lower part of P-Q curve is
moved to left like a graph left under as the tension force of spring is decreased.
OUTPUT FLOW, Q

OUTPUT FLOW, Q
OUTPUT PRESSURE, P OUTPUT PRESSURE, P

85A2MP13

4. APPENDIXES
Required torque for bolt tightening
Required torque
Part Name
kgf·m lbf·ft
Nut 1 14 mm 5.1 36.9
Nut 2 14 mm 5.1 36.9
Nut 3 10 mm 4.1 29.7
Cap nut 32 mm 7.1 51.4
Hexagon screw 10 mm - -

5. DUAL TORQUE MODE

Pump power needs to be decreased in case that engine power is not enough to cover air condition
operating at maximum pump operating. This function lets the pump power decrease by operating of
dual torque valve.
(1) Normal operating condition (without air conditioner mode)
Solenoid valve (7) maintains the pushed position and allows oil to flow from passage (15) to
passage (19). The pressure pushes dual torque valve (5) not to allow the pumping oil to flow
toward control valve (6) inside. As a result, pressure in front of dual torque valve (5) does not
effect on the angle of swash plate (25).

2-4
 (2) Excessive operating condition (by air conditioner mode)
If air conditioner operates with maximum pump operating, the increased power will overload
engine. Therefore, pump power needs to be decreased to share power consumption with air
conditioner without overload to engine.
Connection between passage (15) and passage (19) is blocked by deactivation of solenoid valve
(7). Dual torque valve which was pushed by the pressure in passage (19) also returns to initial
position by spring force. This return allows the pumping oil to flow toward control valve (6) inside.
The angel of swash plate (25) is decreased by the pressure in control valve. As a result, pump
flow is decreased and power consumption by pump also is decreased.

6. UPSTROKE
Upstroking of the pump occurs as a demand for flow from attachment.
The increased demand for flow causes a LS pressure in passage (17). The LS pressure in passage
(17) combines with the force of spring (22) in cavity (21). The force of spring (22) causes pump
pressure to be higher than pressure of passage (17).
If the combination of LS pressure and spring force is greater than the pump discharge pressure in
passage (15), this difference pressure causes a spool (27) to move right. As the spool (27) moves
right, the spool (27) blocks inflow of pumping oil to control piston (6) through passage (20). Swash
plate (25) is controlled by pressure and flow as much as hydraulic system requests.
Pilot oil in passage (20) drains to passage (24). The oil then flows into housing through passage (16)
into the housing and finally drains to tank. It also causes pumping flow to increase. As flow
requirement is satisfied, pump output pressure increases. The pressure increases until the pressure
in passage (24) moves flow compensator spool (27) up to be satisfied with system requirement for
pressure and flow.
·Pump discharge pressure = force of spring (22) + LS pressure (17)

2-5
 24
21
22
2 27
17
3 1
15
30
23
16
20
29 19
5
7 25 7
28

6
14

18
13
9
26 12 11 10

85A2MP14

1 Regulator 13 Bearing 21 Cavity

2 Flow adjustment screw 14 Drive shaft 22 Spring
3 Pressure adjustment screw 15 Passage (high pressure) 23 Spring
4 Pump housing 16 Passage (leakage 24 Passage
5 Dual torque valve pressure) 25 Swash plate
6 Control valve 17 Passage (pilot pressure) 26 Casing drain
7 Solenoid valve 18 Passage (suction pressure) 27 Flow compensator spool
8 Port plate 19 Passage (dual torque valve 28 Spring
9 Distributor plate pilot pressure) 29 Cross drilled hole
10 Cylinder block 20 Passage (control piston 30 Pressure compensator
11 Piston pilot pressure) spool
12 Minimum flow limitation
valve

2-6
7. DESTROKE
The decreased flow demand causes LS pressure in passage (17). LS pressure in passage (17)
combines with force of spring (22) in cavity (21).
This combination of LS pressure and spring force is less than the pump pressure in passage (15). It
causes flow compensator spool (27) to move left.
Pumping oil now flows through passage (15). The oil then flows past flow compensator spool (27),
and then to control piston (6) through passage (20).
Combined force of pump pressure behind control piston (6) and counter spring (28) is bigger than
force of springs inside control piston (6). Angle of swash plate (25) decreases.
This action results in decreasing of pump output and system pressure.
When the flow is decreased enough, flow compensator spool (27) moves right up to the balance
position.
Swash plate (25) maintains the angle that is sufficient to provide the lower required pressure. If the
operator does not operate RCV lever or pedal, the pump will return to low pressure stand-by.

24
21
22
2 27
17
3 1
15
30
23
16
20
29 19
5
7 25 7
28

6
14

18
13
9
26 12 11 10

85A2MP15

2-7
8. LOW PRESSURE STAND-BY
Low pressure standby constitutes the following condition: a running engine and inactive attachment.
There is no flow demand or pressure demand on the pump. Therefore, there is no LS pressure in
passage (17).
Before you start the engine, counter spring (28) holds swash plate (25) at the maximum angle. As the
pump begins to operate, oil begins to flow and pressure increases in the system.
As the pressure increases, the pressure pushes flow compensator spool (27) against spring (22). It
causes flow compensator spool (27) to move left. It opens passage (24) in order to allow pumping oil
to flow to control piston (6) via passage (20).
The oil acts against control piston (6) in order to overcome the force of counter spring (28). The oil
causes control piston (6) to move to the left. When control piston (6) moves to the left, the piston
moves swash plate (25) toward the minimum angle. Control piston (6) continues to move to the left
until cross-drilled hole (29) allows the oil to drain to pump housing. Cross-drilled hole (29) limits the
maximum travel of control piston (6) toward the left.
The pump supplies a sufficient amount of flow that can compensate for the system leakage and the
pump leakage. The leakage to the pump housing is flowed from the cross-drilled hole. The pump
maintains low pressure stand-by. Low pressure stand-by should not exceed 15 bar.
※ Low pressure standby will vary in the same pump as the system leakage or the pump leakage
increases. The pump will slightly upstroke in order to compensate for the leakage increasing.
Control piston (6) will cover much flow control than the flow through the cross-drilled hole.

24
22 21
2 27
17
3 1
15
30
23
16
20
29 19
5
7 25 7
28

6
14

18
13
10 9
26 12 11

85A2MP16

2-8
9. CUT OFF FUNCTION
Once sudden pressure increasing in LS line occurs while attachments work, flow decreasing should
be a necessary function to prevent a shock inside the pump. When high pressure in passage (15)
flows to regulator (1), spools are likely to move by its force. However, shift of flow compensator spool
(27) is restricted by LS pressure pushing spring (22) which is generated from attachments. Therefore,
flow compensator spool (27) still blocks a connection from passage (27) to passage (24). The flow
blocked by flow compensator spool (27) alternatively shifts pressure compensator spool (30) to right.
Passage (15) connects to passage (20) by this shift. High pressure flows to control valve (6), then
decreases an angle of swash plate (25). Pumping flow finally will decrease by shift of flow
compensator spool (27) although flow compensator spool (27) does not shift.

2-9
GROUP 2 MAIN CONTROL VALVE
1. OUTLINE

85A2MC01

Mark Port name Mark Port name

P1 Pump port T3 Tank return port
P2 Pump port a11 Swing pilot port (LH)
A11 Swing port (LH) b11 Swing pilot port (RH)
B11 Swing port (RH) a6 Dozer down pilot port
A6 Dozer down port b6 Dozer up pilot port
B6 Dozer up port a7 Boom swing pilot port (LH)
A7 Boom swing port (LH) b7 Boom swing pilot port (RH)
B7 Boom swing port (RH) a9 2 Way pilot port (opt)
A9 2 Way (opt) b9 2 Way pilot port (opt)
B9 2 Way (opt) a8 2 pcs boom up pilot port (opt)
A8 2 pcs boom up port (opt) b8 2 pcs boom down pilot port (opt)
B8 2 pcs boom down port (opt) a4 Arm out pilot port
A4 Arm out port b4 Arm in pilot port
B4 Arm in port a2 Travel pilot port (LH/FW)
A2 Travel port [LH/FW] b2 Travel pilot port (LH/RR)
B2 Travel port [LH/RR] a1 Travel pilot port (RH/FW)
A1 Travel port [RH/FW] b1 Travel pilot port (RH/RR)
B1 Travel port [RH/RR] a3 Boom up pilot port
A3 Boom up port b3 Boom down pilot port
B3 Boom down port a5 Bucket in pilot port
A5 Bucket in port b5 Bucket out pilot port
B5 Bucket out port a10 Auxiliary 1 pilot port (opt)
A10 Auxiliary 1 port (opt) b10 Auxiliary 1 pilot port (opt)
B10 Auxiliary 1 port (opt) LS1 Load sensing port (opt)
T1 Tank return port LS2 Load sensing port (opt)

2-10
2. STRUCTURE (1/5)

85A2MC02

1 Tie rod 3 Tie rod 5 Plate seal

2 Outlet block assy 4 Seal kit 7 Inner plate block assy

2-11
 STRUCTURE (2/5)
1 (INLET)

85A2MC03

1-110 Regulator kit 1-130 Relief valve 1-142 Shuttle valve

1-120 Flow regulator 1-139 Half blue cover 1-182 Plug

2-12
 STRUCTURE (3/5)

"
!

55Z92MC04

2-4 Seal kit 3-221 Plug 4-240 Cover kit 5-242 Cover kit
2-41 Seal kit 3-225 Compensator kit 4-242 Cover kit 5-245 Snubber
2-221 Plug 3-240 Cover kit 4-245 Snubber 6-4 Seal kit
2-224 Throttle element 3-242 Cover kit 5-4 Seal kit 6-41 Seal kit
2-225 Compensator kit 4-4 Seal kit 5-41 Seal kit 6-210 Relief valve
2-240 Cover kit 4-41 Seal kit 5-210 Relief valve 6-220 Check valve
2-242 Cover kit 4-210 Relief valve 5-220 Check valve 6-225 Compensator kit
3-4 Seal kit 4-220 Check valve 5-225 Compensator kit 6-240 Cover kit
3-41 Seal kit 4-225 Compensator kit 5-240 Cover kit 6-242 Cover ki

2-13
STRUCTURE (4/5)

85A2MC05

8-5 Plate seal 8-161 Cover kit 9-25 Check valve

8-22 Relief valve 8-180 W/spool cover kit 9-28 Seal kit
8-23 Plug 8-181 W/spool cover kit 9-160 W/spool cover kit
8-24 Compensator kit 9-5 Plate seal 9-161 Cover kit
8-25 Check valve 9-22 Relief valve 9-174 Snubber
8-28 Seal kit 9-24 Compensator kit

2-14
STRUCTURE (5/5)

85A2MC06

10-5 Plate seal 10-160 W/spool cover kit 11-25 Check valve
10-22 Relief valve 10-161 Cover kit 11-28 Seal kit
10-24 Compensator kit 11-5 Plate seal 11-170 W/spool cover kit
10-25 Check valve 11-23 Plug 11-171 Cover kit
10-28 Seal kit 11-24 Compensator kit 11-174 Snubber

2-15
 or

Arm
Dozer
swing
Boom

(LH)
Travel
Travel
(2-WAY)
Swing

Breaker

(RH)
Boom
Bucket
LS2 M b'1 b1 B1 A1 b'2 b2 B2 A2 b'3 b3 B3 A3 b'4 b4 B4 A4 b'5 b5 B5 A5 b6 B6 A6 b7 B7 A7 b9 B9 A9 b11 B11 A11

P1 P3

LS1
3. HYDRAULIC CIRCUIT (boom swing, 2-way)

TRAVEL TRAVEL BOOM ARM BUCKET DOZER BOOM AUX.1 SWING

RH LH SWING

2-16
T1

T B A T T B A T T B A T T B T B A T T B A T
Y1

a1 a'1 a2 a'2 a3 a'3 a4 a'4 a5 a'5 a6 a7 a9 a11 T3

85A2MC07
4. FUNCTION
1) INLET ELEMENT DESCRIPTION
- The inlet plate has the line connections P,
T, LS,Y and M. LS2 M
- The inlet element moreover comprises all
components necessary for the system P1
function: One flow control valve (1) for the LS1
controlled unloading of the LS line and
one LS pressure relief valve (2) to limit
the maximum system pressure.
- Protection of the system by means of LS
pressure relief valve (2) combined with
flushing valve (3).

3 T1

Y
85A2MC10

2-17
(1) Inlet description - all spools at neutral position
First section-travel-represented at neutral

85A2MC11

LS2 M b1 b'1 B1 A1

P1
LS1

Pump
Other spools sections

Tank

Pilot

Pilot oil drain

LS pressure

T1

Y a1 a'1 85A2MC12

The Inlet element allows the exchange of the in the flow from the pump and the out flow to the
tank.
When all sections are in neutral position, the pump is in stand-by and flow is reduced to the
minimum pump flow (14 ℓ/min).
All the minimum pump flow pass through the flushing valve which is open, it means connected to
the tank.

2-18
(2) Inlet description - spool actuated
First section-travel-PABT spool position represented.

85A2MC13

LS2 M b1 b'1 B1 A1

P1
LS1

Pump
Other spools sections

Tank

Pilot

Pilot oil drain

LS pressure

T1

Y a1 a'1 85A2MC14

As soon as one or more spool moves, the flow stop to pass trough the flushing valve, which is
closed, not anymore connected to the tank. The flow pass trough the spool to reach the
movement, and then go to the tank by the T line after the spool.

2-19
2) TRAVEL SECTION DESCRIPTION - SECTION 1 AND 2
(1) Component description

3
85A2MC15

1 Spring pack
Pump 2 Housing
3 Pressure compensator
Tank
4 Spool
Pilot

Pilot oil drain

LS pressure

Consumer
85A2MC16

2-20
(2) Neutral position

A1 B1

a1 b1

Connection
between the
LS two travel section

The spool is in neutral position, pump is in Left travel

low pressure stand-by. The A and B ports are b1 B1 A1

not connected to the pumps but to the tank.
This is in order to ensure A and B to be
drained to tank. The two translation
branches, 1 and 2, are connected in order
not to have differences in traction.

a1
85A2MC15

2-21
(3) Travel forward posion

A1 B1

a1 b1 Left travel
b1 B1 A1

Connection
between the
LS two travel section

a1
85A2MC18

When the pilot pressure is led to the port a1, the oil from the pump flows to the cylinder port A1
and oil from the cylinder flows into the tank through the cylinder port B1.

(4) Travel reverse posion

A1 B1

a1 b1 Left travel
b1 B1 A1

LS

a1
85A2MC19

When the pilot pressure is led to the port b1, the oil from the pump flows to the cylinder port B1
and oil from the cylinder flows into the tank through the cylinder port A1.

2-22
3) BOOM AND ARM SECTION 3 AND 4 DESCRIPTION - WITH REGENERATION SPOOLS
(1) Component description

5
2

4
3 85A2MC20

Pump
1 Spring pack
2 Housing
Tank 3 Pressure compensator
4 Check valves
Pilot
5 Regeneration spool
Pilot oil drain 6 Spool
7 Shuttle valve
LS pressure 8 Relief valves
Consumer

Regeneration flow
(position PABT on nest pages)
85A2MC21

2-23
(2) Neutral position

A3 B3

a3 b3

LS
85A2MC22

Boom
The spool is in neutral position, oil from the
pump is blocked, pump is in low pressure
stand-by. The A and B ports are not connect-
ed to the pump nor the tank. b3
B3 A3

a3
85A2MC23

2-24
(3) Boom section description
① Boom down posion

Boom

A3 B3

a3 b3 b3 B3 A3

LS
Regeneration flow

When the pilot pressure is led to the port a4, the oil from the pump a3
flows to the cylinder port A4 and oil from the cylinder flows partially 85A2MC24

into the tank and partially trough regeneration path B to A through the
cylinder port B4 .

② Boom up posion

Boom
A3 B3

a3 b3
b3 B3 A3

LS

When the pilot pressure is led to the port b4, the oil from the pump a3
flows to the cylinder port B4 and oil from the cylinder flows into the 85A2MC25

tank through the cylinder port A4.

2-25
(4) Arm section description
① Neutral position

Arm
A4 B4
a4 b4
b4 B4 A4

LS

The spool is in neutral position, oil from the pump is blocked, pump is a4
in low pressure stand-by. The A and B ports are not connected to the 85A2MC26

pump nor the tank.

2-26
 ② Arm roll in posion

Arm

A4 B4

a4 b4 b4 B4 A4

LS
Regeneration flow

When the pilot pressure is led to the port a4, the oil from the pump a4
flows to the cylinder port A4 and oil from the cylinder flows partially 85A2MC27

into the tank and partially trough regeneration path B to A through the
cylinder port B4 .

③ Arm roll out posion

Arm

A4 B4

a4 b4
b4 B4 A4

LS

When the pilot pressure is led to the port b4, the oil from the pump a4
flows to the cylinder port B4 and oil from the cylinder flows into the 85A2MC28

tank through the cylinder port A4.

2-27
4) BUCKET SECTION DESCRIPTION - SECTION 5
(1) Component description

2
4

3
85A2MC29

1 Spring pack
Pump 2 Housing
3 Pressure compensator
Tank
4 Check valves
Pilot 5 Spool
7 Overload relief valves
Pilot oil drain

LS pressure

Consumer

85A2MC30

2-28
(2) Neutral position

A3 B3

a3 b3

LS
85A2MC31

Bucket
The spool is in neutral position, pump is in
low pressure stand-by. The A and B ports
are not connected to the pumps nor the tank.
b5 B5 A5

a5
85A2MC32

2-29
(3) Bucket roll in posion

Bucket

A5 B5
b5 B5 A5
a5 b5

LS

a5
85A2MC33

When the pilot pressure is led to the port a5, the oil from the pump flows to the cylinder port A5
and oil from the cylinder flows into the tank through the cylinder port B5.

(4) Bucket roll out posion

Bucket

A5 B5

a5 b5 b5 B5 A5

LS

a5 85A2MC34

When the pilot pressure is led to the port b5, the oil from the pump flows to the cylinder port B5
and oil from the cylinder flows into the tank through the cylinder port A5.
2-30
GROUP 3 SWING DEVICE

1. STRUCTURE
Swing device consists swing motor, swing reduction gear.
1) SWING MOTOR
Swing motor include mechanical parking valve, relief valve, make up valve and time delay valve.

Outlet shaft Oil level gauge Time delay valve Mu GA GB Dr

Gear oil filling port(PT1/2) SH PG A B

5592SM01

Port Port name Port size

SH
A Main port SAE PF 1/2
PG B Main port SAE PF 1/2
Dr Drain port PF 3/8
Air vent Mu Make up port PF 3/4
PG Brake release stand by port PF 1/4
SH Brake release pilot port PF 1/4
Dr
GA,GB Gauge port PF 1/4
GA GB

A Mu B

Hydraulic circuit

2-31
4 6 8 3 14 29 30 16 22 33 34 41,42 19 20,21 35 36 38 37

1 2 5 7 10 9 11 26 27 28 13 15 12 32 31 17 24 25 39 40 18

555K2SM03

1 Body 15 Taper bearing 29 O-ring

2 Oil seal 16 Valve plate 30 Spring
3 Cylinder block 17 Relief valve assy 31 Time delay valve
4 Shaft 18 Socket bolt 32 Socket bolt
5 Taper bearing 19 Plug 33 Plug
6 Bushing 20 Plug 34 O-ring
7 Shoe plate 21 O-ring 35 Valve
8 Spring 22 Shim 36 Spring
9 Set plate 23 Plug 37 Plug
10 Piston shoe assy 24 Back up ring 38 O-ring
11 Ball guide 25 O-ring 39 O-ring
12 Rear cover 26 Friction plate 40 Back up ring
13 Pin 27 Plate 41 Name plate
14 O-ring 28 Parking piston 42 Rivet

2-32
2) REDUCTION GEAR

2 3 4 5 6 31 26 28 30 29 7 8

24
32

23
22

21

9
25

1 16 15 14 13 27 20 11 17
55W72SM02

1 Shaft 12 Carrier assy 2 23 Bushing 1

2 Bearing cover 13 Dowel pin 24 Thrust washer 1
3 Taper roller bearing 14 Collar 25 Thrust washer 3
4 Case 15 Plug 26 Thrust washer 2
5 Oil seal 16 Plug 27 Carrier assy 2
6 Taper roller bearing 17 Cover 28 Planet gear 2
7 Sun gear 2 18 Pipe 29 Pin 2
8 Socket bolt 19 Level gauge 30 Bushing 2
9 Sun gear 1 20 Carrier assy 1 31 Spring pin
10 Carrier assy 1 21 Planet gear 1 32 Snap ring
11 Ring gear 22 Pin 1 33 Thrust washer 4

2-33
2. FUNCTION
1) ROTARY PART
When high pressurized oil enters a cylinder through port(a), which is the inlet of balance plate(16),
hydraulic pressure acting on the piston causes axial force F. The pressure force F works via the
piston(10) upon the return plate(9) which acts upon the swash plate(7) via an hydrostatic bearing.
Force F1 perpendicular to swash plate(7) and force F2 perpendicular to cylinder center.
Being transferred to the cylinder block(3) through piston, force F2 causes rotational moment at
surroundings of cylinder.
Since cylinder block has 9 equidistantly arrayed pistons, rotational torque is transmitted to cylinder
shaft in order by several pistons connected to the inlet port of high pressurized oil. When the
direction of oil flow is reversed, rotational direction of cylinder is also reversed. Output torque is
given by the equation.
p×q F
T= , q=Z·A·PCD·tanθ, F1 = , F2=F tanθ , S=PCD×tanθ
2Л COSθ
Where p : Effective difference of pressure (kgf/cm2)
q : Displacement (cc/rev)
T : Output torque (kgf·cm)
Z : Piston number (9EA)
A : Piston area (cm2)
θ: Tilting angle of swash plate (degree)
S : Piston stroke (cm)

Low High
pressure oil pressure oil

F1 F1
F

16

7 9 10 3 R5572SF35

2-34
2) MAKE UP VALVE
(1) Outline
The safety valve portion consists of a
check valve and safety valve.
(2) Function
When the swing is stopped, the output
circuit of the motor continues to rotate
because of inertia. For this reason, the
pressure at the output side of the motor
becomes abnormality high, and this will
damage the motor. To prevent this, the oil
causing the abnormal hydraulic pressure
Dr
is allowed to escape from the outlet port
(high-pressure side) of the motor to port
Mu, thereby preventing damage to the
motor. A Mu B
Compared with a counterbalance valve,
there is no closed-in pressure generated
at the outlet port side when slowing down
the swing speed. This means that there is
no vibration when slowing down, so the 555C92SF36

ease of swing control is improved.

(3) Operation
① When starting swing
When the swing control lever is operated
to left swing, the pressurized oil from the
pump passes through the control valves
and is supplied to port B. Because of
this, the pressure at port B rises, staring
torque is generated in the motor, and the
motor starts to rotate. The oil from the
outlet port of the motor passes from port
A through the control valve and returns to
the tank.

2-35
② When stopping swing
· When the swing control lever is returned
to neutral, no pressurized oil is supplied
from the pump to port B.
The return circuit to the tank is closed by SH
the control valve. So the oil from the
outlet port of the motor increases in PG
pressure at port A. Resistance to the
rotation of the motor is created, and the
brake starts to act.
· The pressure at port A rises to the set
pressure of make up valve a, and in this
way, a high brake torque acts on the Dr
motor, and the motor stops. GA GB
· When make up valve a is being actuated,
the relief oil from make up valve a and A Mu B
the oil from port Mu pass through check
valve CB and are supplied to port B.
This prevents cavitation from forming at
R5572SF32
port B.

2-36
3) RELIEF VALVE

2 1 Body
2 Plug
3
3 O-ring
4 Plunger
10 5 Piston
6 Spring
5 7 Spring seat
8 Seat
9 O-ring
9 10 Nut

8
555C92SF37

(1) Construction of relief valve

The valve casing contains two cartridge type relief valves that stop the regular and reverse
rotations of the hydraulic motor. The relief valves relieve high pressure at start or at stop of swing
motion and can control the relief pressure in two steps, high and low, in order to insure smooth
operation.

(2) Function of relief valve

Figure illustrates how the pressure acting P P=pressure, T=time
on the relief valve is related to its rising PS
process. Here is given the function, 4
referring to the figure following page.
P1 3

T
1
29072SM05

2-37
4) BRAKE SYSTEM
(1) Control valve swing brake system
This is the brake system to stop the swing motion of the excavator during operation.
In this system, the hydraulic circuit is throttled by the swing control valve, and the resistance
created by this throttling works as a brake force to slow down the swing motion.

Work Deceleration Stop

A B A B A B

MCV MCV MCV

MCV A, B opened MCV A, B throttled MCV A, B closed

210-7 2-48(1)

(2) Mechanical swing parking brake system

The mechanical swing parking brake system is installed to prevent the upper structure from
swinging downhill because of its own weight when the excavator is parked on a slope since it
completely eliminates the hydraulic drift of swing motion while the excavator is on a slop, work
can be done more easily and safely.

① Brake assembly
Circumferential rotation of separate plate
(27) is constrained by the groove located
at casing (1). When housing is pressed
down by brake spring (30) through
friction plate (26), separate plate (27)
and brake piston (28), friction force 30
occurs there.
Cylinder (3) is constrained by this friction 28
force and brake acts, while brake 27
releases when hydraulic force exceeds
26
spring force.
3
1 R5572SF38

1 Casing 27 Separate plate

3 Cylinder 28 Brake piston
26 Friction plate 30 Brake spring

2-38
② Operating principle
a. When the swing control lever (1) is set to the swing position, the pilot oil go to the swing control
valve (2) and to SH of the time delay valve (3) via the shuttle valve (4), this pressure move
spool (5) to the leftward against the force of the spring (8), so pilot pump charged oil (P4) goes
to the chamber G.
This pressure is applied to move the piston (28) to the upward against the force of the spring
(30). Thus, it releases the brake force.

3
30

5
28 G
SH

1 Swing control lever

2 Swing control valve (MCV)
3 Time delay valve
12
4 Shuttle valve
5 Spool P4
8 Spring
12 Gear pump
2 2
28 Brake piston
30 Brake spring 4
R5572SF39

2-39
b. When the swing control lever (1) is set the neutral position, the time delay valve (3) shifts the
neutral position and the pilot oil blocked chamber G.
Then, the piston (28) is moved lower by spring (30) force and the return oil from the chamber G
is drain.

3
30

28 G
SH

1 Swing control lever

2 Swing control valve (MCV)
3 Time delay valve
4 Shuttle valve
28 Brake piston
30 Brake spring P4

2 2
4
R5572SF40

2-40
 GROUP 4 TRAVEL DEVICE

1. CONSTRUCTION
Travel device consists travel motor and gear box.
Travel motor includes brake valve, parking brake and high/low speed changeover mechanism.

Drain port D1 Oil fill or level check port

PF 3/8 PF 3/8
Main port A
PF 1/2

2 speed control port P

PF 1/4

Main port B
PF 1/2 Gear oil drain port
PF 3/8

Drain port D2
PF 3/8

Gauge port PT 1/8

85A2TM01
VIEW X

2-41
2) STRUCTURE

44 380 112 2 31 106 103 160 21 190 22 11 30 7 28

151 1
324 336 326 325 323 301 345 321 392 376 10
109 3

363 33

366 27

338 29

382 51
B B
145 13

150 40
C C 114 12

399 5

110 41

42 4

342 50

104 6

113 9
205 211 213 203 212 206 214 215 217 204 202 207 208 201 135 39
139 37
SECTION A-A 370 43 116 115 105 107 108 167 149 47 132 102 35 45

368 383 352 338 382 330 327

85A2TM02
SECTION B-B SECTION C-C

1 Hub 29 Inner ring 104 Cylinder block 139 O-ring 211 O-ring 324 Plug
2 Spindle 30 Inner ring 102 Shaft 145 Snap ring for hole 212 O-ring 325 Spring retainer
3 Carrier 31 Floating seal 103 Swash plate 149 Ball bearing 213 Shim 327 Valve
4 Sun gear 1 33 Plug 105 Piston 150 Ball bearing 214 Piston 328 Spring
5 Planetary gear 1 35 O-ring 106 Shoe 151 Roller 215 O-ring 330 Spring
6 Sun gear 2 37 O-ring 107 Retainer plate 160 Piston 217 Orifice 336 O-ring
7 Planetary gear 2 39 Plug 108 Thrust ball 167 Pivot 301 Rear flange 338 O-ring
9 Thrust collar 1 40 Hex head bolt 109 Timing plate 170 Spring 323 Spool 342 Parallel pin
10 Thrust washer 1 41 Steel ball 110 Washer 201 Valve seat 352 Hex socket plug 345 Hex socket bolt
11 Thrust washer 2 42 Parallel pin 112 Piston 202 Valve 368 Steel ball 363 Spool
12 Thrust washer 3 43 O-ring 113 Spring 203 Sleeve 375 Hex socket plug 366 Spring
13 Cover 44 O-ring 114 Spring 204 Collar 379 Filter 382 Plug
21 Bell bearing 45 Ring 115 Friction plate 205 Plug 380 Orifice 392 O-ring
22 Ring nut 47 Hex socket set screw 116 Mating plate 206 Spring 383 Plug
27 Needle roller bearing 50 Retaining ring for shaft 132 Oil seal 207 O-ring 390 Name plate
28 Needle roller bearing 51 Hex head bolt 135 O-ring 208 Back-up ring 321 Plug
2-42
2. OPERATING DESCRIPTION
1) REDUCTION GEAR
(1) Function
This reduction gear unit is composed of two stage planetary gear mechanism and reduces high
speed rotation from hydraulic motor and converts it into low-speed, high-torque rotation.
(2) Operating description
The rotation of the shaft [102] is transmitted to the sun gear (1) [4] of the first stage which is linked
with the shaft [102] by the spline. At this time, since the sun gear (1) [4] is meshed with the
planetary gears (1) [5], and the planetary gears (1) [5] are also meshed with the hub [1], the
planetary gears (1) [5] revolve.
Since the planetary gears (1) [5] are meshed with the carrier [3] and the carrier [3] meshed with
the sun gear (2) [6], the revolution of the planetary gears (1) [5] makes the sun gear (2) [6] rotate.
The rotation of the sun gear (2) [6] is transmitted to the hub [1] through the planetary gear (2) [7]
fixed by the pillar of the spindle [2]. The rotation of the hub [1] is output rotation.

INPUT OUTPUT

85A2TM03

2) HYDRAULIC MOTOR (WITH BRAKE VALVE, PARKING BRAKE AND HIGH-LOW 2-SPEED
SWITCHING MECHANISM)
(1) Function
① Hydraulic motor
This hydraulic motor is a swash-plate-type axial-piston motor.
Converting the force of pressurized oil supplied from a pump into rotary motion.
② Brake valve
a. It controls inertia when stopping the hydraulic motor, in order to provide smooth stopping.
b. It prevents cavitation from occurring inside the hydraulic motor.
c. It opens the ports for releasing the parking brake while travelling and closes the ports
when stopping.

2-43
③ Parking valve
With friction-plate-type braking mechanism, the parking brake prevents an excavator from sliding
downwards due to gravity when stopping on a slope. It is integrated as a part of the hydraulic
motor.
④ High-low 2-speed switching mechanism
The movements of the switching spool and the control piston adjust an angle of the swash
plate, and change the piston displacement in the hydraulic motor.

(2) Operation principle

① Hydraulic motor
Pressurized oil from the main port (A) enters the rear flange [301] of the traveling unit, passes
through the brake valve and is led into the cylinder block [104] through the timing plate [109].
The oil only enters the cylinder block [104] on either side of axis Y1-Y2 and generates force (F
[N] = P [MPa] × A [mm2]) when it pushes the pistons [105] (4 or 5 pistons).
As the angle of swash plate [103] is fixed at the angle (α°) to the shaft [102] axis, the force
generated on the swash plate [103] can be separated into two component forces (F2, F3). Only
F3 generates radial force which turns into torque (T=F3×ri). The sum of all torques {T=Σ (F3×ri)}
created by pistons [105] turns into rotational force which rotates the cylinder block [104]. As the
cylinder block [104] is linked to the shaft [102] with the spline, the shaft [102] rotates and the
rotational torque is transmitted.

Y1
F3
301 104 105

F3
ri

F3
F3

Y2

F1
P A
F3
109 102 F2
103
á

85A2TM04

2-44
② Brake valve
The port (A) and Port (B) are the input and output ports for hydraulic oil. The following descripti-
on assumes that hydraulic oil is fed through port (A). If the oil is fed through port (B), the flow and
motion are reversed. The direction of rotation of the motor is also reversed.

a. Normal Operation
Hydraulic oil is fed from the pump to the
port (A), causing the hydraulic motor to
rotate. The details are as follows.
First, hydraulic oil fed from the pump
enters at the port (A) and opens the
valve [327]. The oil passes through the 323 327
valve [327] enters the hydraulic motor
through the port (C) and applies rotary
force to the hydraulic motor. B A C
D
At the same time, the hydraulic oil also
passes through the small holes in the
spool [323] and through the passage
(a) to the chamber (b). 85A2TM05

The hydraulic pressure in the chamber

(b) causes the spool [323] to move from
the central position to the left. At this
time a groove in the
spool [323] forms a passage for the Parking brake
hydraulic oil
to pass between the port (D) and port E
(B). The hydraulic oil ejected from the
323 a b
hydraulic motor flows from the port (D)
to the port (B), and the hydraulic motor
rotates. The hydraulic oil from the port
(B) returns to the oil tank.
Also, as the spool [323] moves to the
left, the hydraulic oil enters the port (E). D C
The hydraulic oil at the port (E) flows to
the parking brake and the 2-speed 328
switching valve.
B A 85A2TM06

2-45
b. Stop operation
Braking Operation When pressurized oil
supplies through the port (A) is suspended
while traveling, the hydraulic force to push
the spool [323] is lost, and the spool [323]
which is slid to the left side, tries to return 323 327
to the neutral position due to the spring
[328] force. At that time, though the oil in
the chamber (b) tries to flow out to the port
D B A C
(A) side through the passage (a) in the
spool [323], its flow is restricted and the
back pressure is generated by throttle
effect in the passage (a). As the result, the
retur n speed of the spool [323] is 85A2TM07

controlled. At the same time, the hydraulic

motor tries to rotate with its inertia force
even though the pressurized oil is
suspended, and the return oil from the
hydraulic motor tries to return to the port Parking
brake
(B) from the port (D) through the passage
formed from the spool groove and rear
301 323
flange [301].
a b
When the spool [323] entirely returns to 326
the neutral position, the passage is
completely closed by the spool [323], and
the hydraulic motor ceases its rotation.
While running, the brake valve smoothly
stops rotation of the hydraulic motor which D C
tries to rotate with its inertia force, by
means of throttling the return side passage 328

of the hydraulic motor, generating back

B A
pressure due to shape of the spool groove 85A2TM08

and controlling the return speed of the

spool [323].
On the other hand, during brake operation,
the hydraulic motor tries to rotate with its
iner tia force and to intake oil by its
pumping function.
However, the intake side is closed its
passage with the spool [323], oil supply is
suspended. This causes cavitation in the
hydraulic motor.
To prevent the cavitation, the valve [327] is
operated by very slight negative pressure
to open the passage of the port (A) side
and intake the port (C) of the hydraulic
motor.

2-46
c. Down-hill
When going down-hill, external force
acts to accelerate the hydraulic motor.
As the result, the pressure at the port
(A) and port (C) decrease and the
spool [323] tries to return to the neutral 323 327
position. The movement of the spool
[323] reduces the size of flow channel
from the port (D) to the port (B) on the
D B A C
output side of the hydraulic motor. This
restricts the amount of hydraulic oil
ejected from the port (D) to the port (B).
At the same time, the pressure at the
port (D) (back pressure) increases. 85A2TM09

Thus overrunning when going down-hill

is prevented by controlling the flow rate
and pressure.

Parking
brake

301 323
a b

D C

328

B A 85A2TM10

2-47
③ Operation description of relief valve
a. Starting
The pressurized oil supplied from the pump is led to the port (C) from the port (A). since the
port (C) is connected with the hydraulic motor, the pressurized oil brings rotation to the
hydraulic motor. At this time, the valve [202-a] of the relief valve(R/V) “A” is not opened for the
pressurized oil of the port (C). The piston [214-a] moves to the stroke end of the direction of the
arrow with the pressurized oil. The oil in the chamber (x) is led to the port (D) through the orifice
(c) of the sleeve [203-a] and the orifice (b) of the valve [202-a]. The pressurized oil of the port
(C) opens the valve [202-b] (b) of the relief valve “B” with set pressure, and the pressurized oil
is led to the port (D). The pressurized oil from the port (C) is also led to the chamber (y) through
the orifice (f) of the valve [202-b] and the orifice (g) of the sleeve [203-b]. When the piston
[214-b] doesn’t reach the stroke end due to previous stopping condition, the piston [214-b]
moves to the stroke end by the pressurized oil from the port “C” After the piston [214-b] reaches
the stroke end, the pressure between the orifice (f) of the valve [202-b] and the orifice (g) of the
sleeve [203-b] rises. Cracking pressure of the valve [202-b] turns into more than the system
pressure of the excavator and the valve [202-b] is closed.
The pressure of the port (C) rises by operation of the relief valve(R/V) “A” and “B”, and the
hydraulic motor can obtain torque.

Chamber (y)
214-a
Orifice (f)
202-b

203-a
Orifice (c)
R/V B
D C

R/V A
203-b
Orifice (g)

Chamber (x)

214-b 202-a
B A Orifice (b)
85A2TM11

2-48
The pressure of the port (C) at starting is as follows.

Pressure

Time

Relief valve B is opened

85A2TM12

When the piston [214-b] position has reached the stroke end due to the just before the stopping
condition, the valve [202-b] of the relief valve (R/V) “B” is not opened.
The pressure of the port (C) in this case is as follows.
Pressure

Time

85A2TM13

The pressure of the port (C) at starting depends on the piston [214-b] position.
※ When the pressurized oil supplied from the pump is led to the port (D) from the port (B), operation
explanation becomes what replaced the relief valve (R/V) “A” and relief valve (R/V) “B”.

2-49
b. Stopping
When the pressurized oil from the port “A” is suspended. The spool [323] tries to return to the
neutral position and the pressure of the port “D” increases because the hydraulic motor tries to
rotate with its inertia.
The pressurized oil of the port (D) is led to the chamber (x) through the orifice (b) of the valve
[202-a] and the orifice (c) of the sleeve [203-a]. The piston [214-a] moves to the stroke end of
the direction of the arrow with the pressurized oil led to the chamber (x). While the piston [214-
a] is moving, the pressure in the chamber (x) does not rise. The pressurized oil of the port (D)
opens the valve [202-a] of the relief valve (R/V) “A” with set pressure, and the pressurized oil
flows into the port (C). (Pressure while the piston [214-a] is moving to the stroke end. : Primary
relief pressure)
The pressure of the port (D) is controlled by operation of the relief valve (R/V) “A”, and
cavitation is prevented by supplying oil to the port (C).
When the piston [214-a] reaches the stroke end, the pressure of the chamber (x) and the
pressure between the orifice (b) of the valve [202-a] and the orifice (c) of the sleeve [203-a]
rises, and the valve [202-a] is closed. At this time, the pressure when the valve [202-a] opens
exceeds the system pressure of the excavator. (Pressure at the time of the completion of the
piston move: Secondary relief pressure)
The piston [214-b] of the relief valve (R/V) “B” moves to the direction of the arrow with the
pressurized oil of the port (D). The oil of the chamber (y) is led to the port (C) through the orifice
(g) of the sleeve [203-b] and the orifice (f) of the valve [202-b].

Chamber (y)
214-a
Orifice (f)
202-b

203-a
Orifice (c)
R/V B
D C

R/V A
203-b
Orifice (g)

Chamber (x)
B
214-b 202-a
A Orifice (b) 85A2TM14

2-50
The pressure of the port (D) at stopping is as follows.

Pressure

Time

Piston 214-a is moving

Relief valve A is opened

85A2TM15

Pressure while the piston is moving to the stroke end : Primary relief pressure
Pressure at the time of completion of the piston move : Secondary relief pressure

2-51
④ High-low 2-speed switching mechanism
a. Low Speed
When the pilot pressure is not provided from the port (P), the traveling unit is low speed mode.
At this time, the spool [363] is pressed to the left side by the force of the spring [366], the
pressurized oil supplied from the port (F) is shut off, and the oil in the chamber (s) is released
into the drain (motor case) through the spool [363].
Since the force of the piston [160] is small, the swash plate [103] is parallel to side (Y). At this
time, the swash plate [103] is tilted at the maximum angle (θ1), thus leading to low speed
operation.

363 160

Chamber s
P

Drain

F
366
Fulcrum
Side Y
A or B

103

85A2TM16
B A

2-52
b. High speed
When the pilot pressure is supplied to the port (P), the traveling unit is high speed mode. At this
time, the pressure overcomes the force of the spring [366] and spool [363] is slid to the right
side. The pressurized oil supplied from the port (F) is then led to the chamber (s) through the
spool [363].
Since the force that works to the swash plate [103] is increased by the pressurized oil of the
chamber (s), the piston [160] pushes the swash plate [103] until the swash plate [103] touch on
the side (x). At this time, the swash plate [103] is tilted at the minimum angle (θ2), thus leading
to high-speed operation.

363 160

P Chamber s

F
366
Fulcrum

A or B

Side Y

103

B A 85A2TM17

2-53
c. Automatic switching from high speed to low speed
As the load on the hydraulic motor increases, the pressure at the port (A) or (B) also Increases.
While operating at the high speed mode, when the pressure at the port (A) or (B) reaches the
setting pressure, the spool [363] is pressed leftwards. From this point, the operation is as
described for ' Low Speed mode '. The force that works to the swash plate [103] from the piston
[160] is decreased, and the hydraulic oil of the chamber (s) is led to drain (motor case) through
the spool [363]. The swash plate [103] touches on the side (Y). At this time, the swash plate
[103] is tilted at the maximum angle (θ1). Thus in this state the hydraulic motor has the
maximum displacement with low rotary speed.

363 160

Chamber s
P

Drain

F
366
Fulcrum
Side Y
A or B

103

B A
85A2TM18

2-54
⑤ Parking brake
a. Traveling
When hydraulic oil is fed from the pump to the port (A) or port (B), causing the spool [323] to
move to the left or right. The movement of the spool [323] opens the port (E). The hydraulic oil
is fed from the port (E) to the chamber (c). When the pressure increases more than the force of
the springs [113], the piston [112] moves in the direction of the rear flange [301]. As the result,
the force from the piston [112] onto the mating plates [116] and friction plates [115] lose, and
the friction plates [115] are relieved from the fixing.
Since the friction plates [115] linked with the cylinder block [104], the braking force of the
cylinder block [104] is released, and the hydraulic motor is able to rotate freely.

104 112 116 115

Parking brake

323 a b

D C

328
301
B A
113 85A2TM19
Chamber (c)

2-55
b. Stopping
When hydraulic oil fed from the pump to the port (A) or port (B) stops, the spool [323] moves to
the neutral position and closes the port (E).
While the spool is returning to the neutral position, the pressurized oil in the chamber (c) is
being drained to not only the port (A) or (B) but also to the drain (motor case) through the
orifice (r). As the result, the pressure in the chamber (c) falls. When this pressure falls below
the release pressure of the parking brake, the hydraulic force on the piston [112] becomes less
than the force of the springs [113]. The springs [113] cause the piston [112] to press the mating
plates [116] and friction plates [115]. The action creates the friction that serves as the braking
force. Since the friction plates [115] are linked with both the cylinder block [104] and the shaft
[102], the brake torque is applied to the hydraulic motor while stopped.

104 112 116 115 102

Orifice (r)

301

113 85A2TM20
Chamber (c)

※ If torque exceeding the parking brake torque acts from the outside, the traveling unit will rotate.

2-56
GROUP 5 RCV LEVER

1. STRUCTURE
The casing has the oil inlet port P (primary pressure) and the oil outlet port T (tank). In addition the
secondary pressure is taken out through ports 1, 2, 3 and 4 provided at the bottom face.

19

Switches
No. LH RH
5 Horn Breaker
5

19
25
Single
operation Simultaneous
operation

Tilted direction of
handle(RH)

1 P
T Tilted direction of
connector(LH, RH)
2 3
PF 3/8

A A Tilted direction of
handle(LH)

VIEW A 559A2RL01

6 - 9/16-18UNF
Port LH RH Port size

P Pilot oil inlet port Pilot oil inlet port

P T
T Pilot oil return port Pilot oil return port
1 Left swing port Bucket out port
PF 3/8
2 Arm in port Boom down port
3 Right swing port Bucket in port
4 Arm out port Boom up port
1 3 2 4
Hydraulic circuit

2-57
CROSS SECTION
The construction of the pilot valve is shown in the attached cross section drawing. The casing has
vertical holes in which reducing valves are assembled.
The pressure reducing section is composed of the spool (3), spring (5) for setting secondary pres-
sure, spring (9), stopper (7), spring seat (6, 12) and shim (4). The spring for setting the secondary
pressure has been generally so preset that the secondary pressure is 5 to 20.5 kgf/cm2 (depending on
the type). The spool is pushed against the push rod (8, 10) by the return spring.
When the push rod is pushed down by tilting the handle, the spring seat comes down simultaneously
and changes setting of the secondary pressure spring.

2-58
 CROSS SECTION

22
24

25

23

21

20
8
18
19 15
16,26
17
13
10 14
7

27

6
12
9
11 5
4
3
1
2
Port 2,4 Port 1,3
60W9S2RL02

1 Case 8 Push rod 15 Rod seal 22 Handle assembly

2 Bushing 9 Spring 16 Plate 23 Handle bar
3 Spool 10 Push rod 17 Boot 24 Nut
4 Shim 11 Spring 18 Joint assembly 25 Boot
5 Spring 12 Spring seat 19 Swash plate 26 Spring pin
6 Spring seat 13 Plug 20 Adjusting nut 27 Bushing
7 Stopper 14 O-ring 21 Lock nut

2-59
2. FUNCTIONS
1) FUNDAMENTAL FUNCTIONS
The pilot valve is a valve that controls the spool stroke, direction, etc of a main control valve. This
function is carried out by providing the spring at one end of the main control valve spool and apply-
ing the output pressure (secondary pressure) of the pilot valve to the other end.
For this function to be carried out satisfactorily, the pilot valve is composed of the following ele-
ments.
(1) Inlet port (P) where oil is supplied from hydraulic pump.
(2) Output ports (1, 2, 3 & 4) to apply pressure supplied from inlet port to ends of control valve
spools.
(3) Tank port (T) necessary to control the above output pressure.
(4) Spool to connect output port to inlet port or tank port.
(5) Mechanical means to control output pressure, including springs that work on the above spools.
2) FUNCTIONS OF MAJOR SECTIONS
The functions of the spool (3) are to receive the supply oil pressure from the hydraulic pump at its
port P, and to change over oil paths to determine whether the pressure oil of port P is led to output
ports 1, 2, 3 & 4 or the output port pressure oil to tank port T.
The spring (5) works on this spool to determine the output pressure.
The change the deflection of this spring, the push rod (8,10) is inserted and can slide in the plug
(13).
For the purpose of changing the displacement of the push rod through the swash plate (19) and
adjusting nut (20) are provided the handle (22) that can be tilted in any direction around the fulcrum
of the universal joint (18) center.
The spring (9) works on the case (1) and spring seat (6, 12) and tries to return the push rod (8,10)
to the zero-displacement position irrespective of the output pressure, securing its resetting to the
center position.
This also has the effect of a reaction spring to give appropriate control feeling to the operator.

2-60
3) OPERATION
The operation of the pilot valve will be described on the basis of the hydraulic circuit diagram
shown below and the attached operation explanation drawing.
The diagram shown below is the typical application example of the pilot valve.

5 6

3
1
3
P T

2 4

2-70

1 Pilot valve 3 Main pump 5 Hydraulic motor

2 Pilot pump 4 Main control valve 6 Hydraulic cylinder

2-61
(1) Case where handle is in neutral position

T 5

P
3

Port 1 Port 3

60W9S2RL03

The force of the spring (5) that determines the output pressure of the pilot valve is not applied to
the spool (3). Therefore, the spool is pushed up by the spring (9) to the position of port 1, 3 in the
operation explanation drawing. Then, since the output port is connected to tank port T only, the
output port pressure becomes equal to tank pressure.

2-62
(2) Case where handle is tilted

10

Port 1 Port 3

60W9S2RL04

When the push rod (10) is stroked, the spool (3) moves downwards.
Then port P is connected with port 1 and the oil supplied from the pilot pump flows through port 1
to generate the pressure.
When the pressure at port 1 increases to the value corresponding to the spring force set by tilting
the handle, the hydraulic pressure force balances with the spring force. If the pressure at port 1
increases higher than the set pressure, port P is disconnected from port 1 and port T is connect-
ed with port 1. If it decreases lower than the set pressure, port P is connected with port 1 and
port T is disconnected from port 1.
In this manner the secondary pressure is kept at the constant value.
Besides, in some type, when the handle is tilted more than a certain angle, the upper end of the
spool contacts with the inside bottom of the push rod and the output pressure is left to be con-
nected with port P.

2-63
GROUP 6 RCV PEDAL

1. STRUCTURE
The casing (Spacer) has the oil inlet port P (Primary pressure), and the oil outlet port T (Tank). In
addition the secondary pressure is taken out through ports 1,2, 3 and 4 provided at the bottom face.

˚ 12.4
12.4 ˚

1 2

3 4

Port Port Port size

P Pilot oil inlet port
T Pilot oil return port
1 Travel (LH, Forward)
PF 1/4
2 Travel (LH, Backward)
T 3 Travel (RH, Forward)
P
4 Travel (RH, Backward)
1 23 4
Hydraulic circuit

14072SF73

2-64
CROSS SECTION
The construction of the RCV pedal is shown in the below drawing. The casing has vertical holes in
which reducing valves are assembled.
The pressure reducing section is composed of the spool (8), spring (6) for setting secondary
pressure, return spring (10), stopper (9), and spring seat (7). The spring for setting the secondary
pressure has been generally so preset that the secondary pressure is 5 to 19 kgf/cm2 (depending on
the type). The spool is pushed against the push rod (14) by the return spring.
When the push rod is pushed down by tilting pedal, the spring seat comes down simultaneously and
changes setting of the secondary pressure spring.

27 31 30 29 28 33

32

24 25, 26
23
3
22
36
15
16
14
21 17
13 18
12 19
20
11
9 6
5 7
4 10

3 8

37 1 35 34 2
14072SF70

1 Body (1) 14 Push rod 27 Cam

2 Body (2) 15 Spring pin 28 Bushing
3 Plug 16 Seal 29 Cam shaft
4 Plug 17 Steel ball 30 Set screw
5 Spring seat 18 Spring 31 Set screw
6 Spring 19 Plate 32 Nut
7 Spring seat 20 Snap ring 33 Bellows
8 Spool 21 Plug 34 Space
9 Stopper 22 O-ring 35 O-ring
10 Spring 23 Rod seal 36 O-ring
11 Rod guide 24 Dust seal 37 Bolt
12 O-ring 25 Cover
13 Snap ring 26 Bolt

2-65
2. FUNCTIONS
1) FUNDAMENTAL FUNCTIONS
The pilot valve is a valve controls the spool stroke, direction, etc of a main control valve. This
function is carried out by providing the spring at one end of the main control valve spool and
applying the output pressure (secondary pressure) of the pilot valve to the other end.
For this function to be carried out satisfactorily, the pilot valve is composed of the following
elements.
(1) Inlet port (P) where oil is supplied from hydraulic pump.
(2) Output port (1, 2, 3 & 4) to apply pressure supplied from inlet port to ends of control valve spools.
(3) Tank port (T) necessary to control the above output pressure.
(4) Spool to connect output port to inlet port tank port.
(5) Mechanical means to control output pressure, including springs that work on the above spools.
2) FUNCTIONS OF MAJOR SECTIONS
The functions of the spool (8) are to receive the supply oil pressure from the hydraulic pump at its
port P, and to change over oil paths to determine whether the pressure oil of port P is led to output
ports 1, 2, 3 & 4 or the output spool to determine the output pressure.
The spring (6) works on this spool to determine the output pressure.
The change the deflection of this spring, the push rod (14) is inserted and can slide in the plug (21).
For the purpose of changing th displacement of the push rod through the cam (27) and adjusting
nut (32) are provided the pedal that can be tilted in any direction around the fulcrum of the cam
(27) center.
The spring (10) works on the casing (1) and spring seat (7) and tries to return the push rod (14) to
the zero-displacement position irrespective of the output pressure, securing its resetting to the
center position.
This also has the effect of a reaction spring to give appropriate control feeling to the operator.

2-66
3) OPERATION
The operation of the pilot valve will be described on the basis of the hydraulic circuit diagram
shown below ant the attached operation explanation drawing.
The diagram shown below is the typical application example of the pilot valve.

5 6

3
1
2

2 4

2-76

1 Pilot valve 3 Main pump 5 Hydraulic motor

2 Pilot pump 4 Main control valve 6 Hydraulic cylinder

2-67
(1) Case where handle is in neutral position

T 8

10
P

14072SF74

The force of the spring (6) that determines the output pressure of the pilot valve is not applied to
the spool (8). Therefore, the spool is pushed up by the spring (10) to the position of port 2 in the
operation explanation drawing. Then, since the output port is connected to tank port T only, the
output port pressure becomes equal to tank pressure.

2-68
(2) Case where handle is tilted

14

14072SF75

When the push rod (14) is stroked, the spool (8) moves downwards.
Then port P is connected with port 1, and the oil supplied from the pilot pump flows through port
1 to generate the pressure.
When the pressure at port 1 increases to the value corresponding to the spring force set by tilting
the handle, the hydraulic pressure force balances with the spring force. If the pressure at port 1
increases higher than the set pressure, port P is disconnected from port 1 and port T is
connected with port 1. If it decreases lower than the set pressure, port P is connected with port 1
and port T is disconnected from port 1.
In this manner the secondary pressure is kept at the constant value.
Besides, in some type, when the handle is tilted more than a certain angle, the upper end of the
spool contacts with inside bottom of the push rod and the output pressure is left to be connected
with port P.

2-69
 SECTION 3 HYDRAULIC SYSTEM

Group 1 Hydraulic Circuit ---------------------------------------------------------------------------------------------- 3-1

Group 2 Main Circuit ----------------------------------------------------------------------------------------------------- 3-4
Group 3 Pilot Circuit ------------------------------------------------------------------------------------------------------ 3-7
Group 4 Single Operation --------------------------------------------------------------------------------------------- 3-12
Group 5 Combined Operation -------------------------------------------------------------------------------------- 3-24
GROUP 1 HYDRAULIC CIRCUIT
1. HYDRAULIC CIRCUIT (1/3)
(33-R1)
4 4 <RCV LEVER>
RED RED
3 DR V LH-RCV LEVER RH-RCV LEVER
(Tank-T5) P2 P3
P3
P2
16-1 (MODULATION)
D2
RED D1 D2 2WAY 2WAY
D1 (4_2-B) CLAMP RELEASE
(4_2-A) G.P2 D C G.P1
5-1 LH RH 6
P P Breaker
(4_1-A) Horn
(4_1-B)
B Pi A
(4_1-P) & (4_2-P)
Option
(Quick coupler)
(4_1-D1) & (4_2-D2)
<DOZER RCV LEVER>
Dr E A B C D F H G 17-1 35-1
Dozer
A T B P1 P4 (33-R1)
PP PB P4 P1 Floating
(CCW) (CW) A B B A (11-A2) (2-B6) Travel speed
(BW) (FW) (BW) (FW) (2-A2) (57-A)
(30-C) (11-P1) (2-B11) (2-A11)
(2-B2) (2-A6)
(17-B) (17-A) (17-Dr) (17-E) (17-D) (17-C)
(2-B1)
(2-A1)
<2-Way> <Breaker>

<Quick connectors>
12-1 13-1 14 15 (Option)
or
RH

LH
2

29 1 Main pump
1
(17-F)
2-1 Main control valve
(17-G)
(17-D) (17-C) (17-B) (17-A) (3-A) (3-B) 3 Swing motor
(9-3) (9-1)
(30-H)
(30-K) (30-D)
(30-G)
(8-2) (10-A1) (30-A) 4 Travel motor
2-1 25 PS b1 b2 24 PS
b3 5-1 RCV lever(LH)
LS2 M b'1 B1 A1 b'2 B2 A2 b'3 B3 A3 b'4 b4 B4 A4 b'5 b5 B5 A5 b6 B6 A6 b7 B7 A7 b9 B9 A9 b11 B11 A11
(1-B1)
P1
(1-B1) 6 RCV lever(RH)
P3
LS1 7 RCV lever(dozer)
TRAVEL TRAVEL BOOM ARM BUCKET DOZER BOOM AUX.1 SWING
RH LH SWING 8 O.P.T pedal
(1-X)
9 Travel pedal
10 2 EPPR valve
11 Solenoid valve assy
12-1 Boom cylinder
13-1 Arm cylinder
14 Bucket cylinder
15 Boom swing cylinder
T1
16-1 Dozer cylinder
T B A T T B A T T B A T T B T B A T T B A T
17-1 Turning joint
Y1 T3 18 Return check valve
a5 19 Return check valve
18 a1 a'1 a2 a'2 a3 a'3 a4 a'4
a'5 a6 a7 a9 a11
(9-4) (9-2) (30-J) (30-L) (30-E) (30-F) (8-1) (10-A2) (30-B) 19 20 Radiator total assy
21 Air breather
(57-T) (10-T) (2-b9) (2-a9) 8 BOOM SWING 9 TRAVEL
22 Return filter w/bypass valve
(Tank-T3) T7
10 A1 A2 (17-H) 57
T6 T5 T4 T3 T2 T1 L/H R/H
A 23 Suction strainer
(2-LS1)
31 LH RH FW BW FW BW
24 Pressure sensor
P4 P3 P2 P1 P
1 (31-P3) 25 Pressure sensor
X (57-P) P T
33 (17-DR)
41 A DOZER
T 26 Last guard filter
(31-T3)
LS V/V (7-P) (9-P) (6-P) (5-P) 26 Grab Grab 1 P T 2 2 P 1 4 T 3
FLOATING
27 Pilot filter
R1 (3-DR)
Release Clamp 26
C1 C2 C3 C4 C5 & (31-T1) 26 (9-T)
P T Breaker
(2-a2) (2-b2) (2-a1) (2-b1) 28 Accumulator
R2
(34-T)
32 (9-P) (8-P) (32-C2) (8-T) (32-D2) 29 Solenoid valve
R3 PC V/V (2-a7) (2-b7)
D1 D2 D3 D4 D5
(2-P1) 30-1 Terminal assy
(2-P3)
(7-T) (9-T) (6-T) (5-T) SWING 5-1 ARM BOOM 6 BUCKET DOZER 7
31 Block(A)
21 B1 G (Tank-T1)
28 RH LH IN OUT UP DOWN IN OUT DOWN UP
34 (Tank-T4)
32 Block(B)
R2 R1
T
(41-T)
33 Return pipe
(17-E)
T1 (32-D5) P1 P2 In Out A1 ACC A2
34 Relief valve
T2 (11-T)
22 T3 (31-T7) G 11 35-1 Dozer handle
T4 SAFETY TRAVEL
(34-T)
B2 SPEED 3 P 1 4 T 2 2 P 4 3 T 1 1 P T 2 41 Solenoid valve
T5 (3-V) 27 26 26 26
(32-C4)
(32-D4) (32-C3) (32-D3) (32-D1) 55 Shuttle tee
E P2 (32-C1)
P1 57 Solenoid valve
23 (3-PB) 30
T B C A L K H J E D G F
S1
<HYDRAULIC TANK> (2-a4) (2-b3) (2-a5) (2-b6) (2-a6)
S L2 L1 L (Tank-T2) (3-PP)
(2-a11) (2-b11) (2-b4) (2-a3) (2-b5) 30MQ-00001-03 1OF3

3-1
2. HYDRAULIC CIRCUIT (2/3)
Rotating (Option Code : HR02)

<Rotator> <Quick connectors>

(Option)
CW CCW <RCV LEVER>

Instead of 10 Arm Safety Lock (Option Code : AS01 or AS02) Quick Coupler (Option Code : HQ01)
(11-A3)
<4-EPPR Valve> Instead of 5-1 5-2 LH-RCV LEVER
(MODULATION) 6 (MODULATION)
RH-RCV LEVER

(36-A1)
(36-A3)
(2-b9 Shuttle) (2-a9) (2-b10) (2-a10) SWING ARM ROTATOR ROTATOR 2WAY 2WAY
CCW CW CLAMP RELEASE
A1 A2 A3 A4
b9 B9 A9 b10 B10 A10 5-2 RH LH IN OUT LH RH LH RH
T
M
36 Horn
Breaker
(31-T6)
V2 C2

AUX.1 AUX.2
Pi1 13-2
44
P T (2-a4) <QUICK COUPLER>
Option,HQ01
(31-P2) (Quick coupler)

26 Grab
Release
Grab
Clamp
Rotating
CW
Rotating
CCW (31-T1) 3 P 1 4 T 2
(30-H)
&
Breaker 26 (32-D4)
b'4 b4 B4 A4 A B
In Case Of ANGLE DOZER OPTION (32-C4)
36-A1 : Dozer CW 51
36-A2 : Dozer CCW P
ARM T
30-1 (33-R3)
(1-B1)
B C A L K
(2-a4)
(3-PP)
T B A T T B A T Instead of 2-1 (2-a11) (2-b11) (2-b4)

a9 a10
2-2
(36-A2) (36-A4)

Angle Dozer (Option Code : BR12)

T B A T
Instead of 16-1 a4 a'4
2-1
(44-Pi1)
39 (30-L)

16-2
Instead of 35-1 G.P2 D C G.P1
<DOZER RCV LEVER> <2-Way> <Breaker>
G.P2 D C G.P1
(ANGLE DOZER (ANGLE DOZER
35-2 CCW) CW) B Pi A
B A
Dozer
Floating or

Travel speed

Boom Safety Lock (Option Code : BS01 or BS02)

17-2 Dr E A B C D F G H I J
2 29
2-2 Main control valve
7 Instead of 17-1 1
5-2 RCV lever(LH)
DOWN UP
(33-R2)
12-2 12-2 Boom cylinder
13-2 Arm cylinder
40 EC F D

L b'3 b3 B3 A3 16-2 Dozer cylinder

C2
M PS 17-2 Turning joint
(Tank-T2) A B
45
1 T 2
(11-A3) 25 BOOM 25 Pressure sensor
P (10-A1) 2-1 Pi1 V2 T
26 Last guard filter
26 (32-D1) (2-a3) (31-T4)
(32-C1) b9 B9 A9 35-2 Dozer handle
36 4 EPPR valve
30-1 AUX.1 39 Angle dozer cylinder
G F
(2-b6)
40 Selector valve
(2-a6)
44 Safety lock valve
2-1 45 Safety lock valve
(2-b9 Shuttle) (2-a9) 51 Cartridge vavle
A1 A2 T B A T
10
a3 a'3
(45-Pi1)
(30-J)
P T
(31-P2)
(31-T1) T B A T
26 Angle CWDozer Angle Dozer
CCW
a9

Grab Grab (10-A2)

Release Clamp
&
Breaker
30MQ-00001-03 2OF3

3-2
3. HYDRAULIC CIRCUIT (3/3)
2PCS BOOM (Option Code : BM09) 2PCS BOOM + Rotating (Option Code : BM09, HR02)

Instead of 5-1
47 SWING ARM 8 2PCS BOOM
46
RH LH IN OUT
8 5-2
46 47 (31-T6)
OUT IN

(2PCS Boom Out)

OUT IN
(31-T6)
M M
T T
(2PCS Boom Out) C2 C2
(2PCS Boom In) <Quick connectors>
V2 V2 <Rotator>
M M (Option) 3 P 1 4 T 2 1 P T 2
T T
C2 C2 (2PCS Boom In) Pi1 Pi1 CW CCW 26 (32-D4)
(8-T)
V2 V2 (32-C4)
1 P T 2 (8-2) (8-P)
(11-A3)
Pi1 Pi1 (8-T) (2-a8) (2-b8)
26 (36-A1) (46-Pi1)
(8-2) (8-P) (8-2) (36-A3) 30-1 (47-Pi1)
(2-a8) (2-b8)
(46-Pi1) b8 B8 A8 b9 B9 A9 b10 B10 A10 B C A L K
(8-2)
(47-Pi1) (2-a4) (2-b4)
(3-PP)
b8 B8 A8 b9 B9 A9 (2-a11) (2-b11)
2-pcs AUX.1 AUX.2
Instead of 10
2-pcs AUX.1

(2-b9 Shuttle) (2-a9) (2-b10) (2-a10)

A1 A2 A3 A4
36

P T
(31-P2)
2-3 2-4 Grab Grab Rotating Rotating
T B A T T B A T T B A T 26 Release
&
Clamp CW CCW (31-T1)

Breaker
a8 a9 a10 In Case Of ANGLE DOZER OPTION
T B A T T B A T
36-A1 : Dozer OUT
a8 a9 Instead of 2-1 (8-1) (36-A2) (36-A4) 36-A2 : Dozer IN
Instead of 2-1
(8-1)

i-20.255;Travel Alarm RCV LEVER(LH/RH) OPTION Pattern Change (Option Code : PV01)
i-37.138;(Option Code : EA01)
5
SWING P T ARM
REMARKS
PART NO (5 :LH / 6 : RH)
OPTION 48
CODE PRODUCER MODULATION
<ISO type> <A type> <ISO type> <A type>
(5-2)
9 CW CCW IN OUT
5-1 31MQ-21130
6 31MQ-21120
HR00 EATON
(Handle : Daehyun)
RH (6-4) (5-4) (6-2)

5-2 31MQ-21110 LH, RH 3AA 4AA 3BB 4BB

3 14 2 HR02
L/H R/H 2-3 Main control valve
FW BW FW BW
6 2-4 Main control valve
BOOM P T BUCKET
3A 4A 3B 4B
5-2 RCV lever(LH)
(2-b4) (2-a3) (2-a4) (2-b3)
8 O.P.T pedal
26 Last guard filter
2 P 1 4 T 3
26
UP DOWN
2 4
OUT
1
IN
3 (7-1) (7-2) (6-3) (6-1)
30-2 Terminal assy
30-2 35-2 Dozer handle
(2-b2) (2-a1) 36 4 EPPR valve
Instead of 30-1 G F E D
46 2 pcs boom cylinder(LH)
(2-b7) (2-a7) (2-a5) (2-b5)
b2 a1
56 47 2 pcs boom cylinder(RH)
LH RCV RH RCV
ARM OUT (J1-M1) BOOM DOWN (J2-M2) 48 Pattern change valve
50 ISO SWING
CCW
SWING
CW
BUCKET
IN
BUCKET
OUT
50 Pressure switch
type
BOOM UP(J4-M4)
56 Shuttle valve
ARM IN (J3-M3)

BOOM DOWN(J1-M2) ARM OUT (J2-M1)

a2 A SWING SWING BUCKET BUCKET

b1 type CCW CW IN OUT

BOOM UP (J3-M4) ARM IN (J4-M3)

30MQ-00001-03 3OF3
(2-a2) (2-b1)

3-3
GROUP 2 MAIN CIRCUIT

The main hydraulic circuit consists of suction circuit, delivery circuit, return circuit and drain circuit.
The hydraulic system consists of one main pump, one control valve, one swing motor, four cylinders
and two travel motors.
The swash plate type variable displacement axial piston pump is used as the main pump and is
driven by the engine at ratio 1.0 of engine speed.

1. SUCTION AND DELIVERY CIRCUIT

To cylinders To motors

Main control valve To oil cooler

To hydraulic oil tank

Main pump
Suction strainer

Hydraulic oil tank

140L3CI01

The pumps receive oil from the hydraulic tank through a suction strainer. The discharged oil from the
pump flows into the control valve and goes out the tank ports.
The oil discharged from the main pump flows to the actuators through the control valve.
The control valve controls the hydraulic functions.
The return oil from the actuators flows to the hydraulic tank through the control valve and the oil
cooler.

3-4
2. RETURN CIRCUIT

3.0

85A3CI02

All oil returned from each actuator returns to the hydraulic tank through the control valve.
The bypass check valves are provided in the return circuit.
The setting pressure of bypass check valves are 1.5 kgf/cm2 (21 psi) and 3.0 kgf/cm2 (43 psi). Usually, oil
returns to the hydraulic tank from the left side of control valve through oil cooler.
When oil temperature is low, viscosity becomes higher and flow resistance increases when passing
through the oil cooler. When the oil pressure exceeds 3.0 kgf/cm2 (43 psi), the oil returns directly to the
hydraulic tank, resulting in the oil temperature being raised quickly at an appropriate level.
When the oil cooler is clogged, the oil returns directly to the hydraulic tank through bypass check valve (1).
The full-flow filter and bypass relief valve are provided in the hydraulic tank.
The oil returned from right and left side of control valve is combined and filtered by the full-flow filter. A
bypass relief valve is provided in the full-flow filter.
When the filter element is clogged, the bypass relief valve opens at 1.5 kgf/cm2 (21 psi) differential
pressure.

3-5
3. DRAIN CIRCUIT

Travel motor Swing motor

Return line

Turning
joint
Return pipe

R1 Return filter

Hydraulic
oil tank

85A3CI03

Besides internal leaks from the motors and main pump, the oil for lubrication circulates.
1) TRAVEL MOTOR DRAIN CIRCUIT
Oil leaked from the right and left travel motors comes out of the drain ports provided in the
respective motor casing and join with each other. These oils pass through the turning joint and
return to the hydraulic tank after being filtered by return filter.
2) SWING MOTOR DRAIN CIRCUIT
Oil leaked from the swing motor returns to the hydraulic tank passing through return filter with oil
drained from the travel circuit .

3-6
GROUP 3 PILOT CIRCUIT

Remote control valve Remote control valve

RCV pedal
(LH lever) (RH lever)

Boom swing pedal

Block (A) Block (B)

Safety lock
Dozer floating solenoid valve
solenoid valve
Swing parking brake
2 EPPR valve
(grab, breaker)

Travel speed solenoid valve

Line filter
Relief valve
34 kgf/cm2

Pilot pump Suction strainer

85A3CI04

The pilot circuit consists of suction circuit, delivery circuit and return circuit.
The pilot line is provided with relief valve, receives the oil from the hydraulic tank through the suction
strainer.
The discharged oil from the pilot pump flows to the remote control valve through line filter, safety lock
solenoid valve and block (B) and flows to the dozer floating solenoid valve and 2 EPPR valve (grab,
breaker) through line filter and block (A).
Also, the discharged oil from the pilot pump flows to swing parking brake and travel speed solenoid
valve through line filter.

3-7
 1. SUCTION, DELIVERY AND RETURN CIRCUIT
DOZER
CYLINDER
TRAVEL MOTOR(LH) TRAVEL MOTOR(RH)
SWING MOTOR DR V RED RED
(Tank-T5)
P3
RED P2 P3 P2
D2
D1 D2
D1
G.P2 D C G.P1
P P

B Pi A

Dr E A B C D F H G TURNING JOINT

PP PB A T B
(CCW) (CW)
P1 P1 P4
P4
A B B A
(BW) (FW) (BW) (FW)

BOOM CYLINDER BOOM SWING <2-Way> <Breaker>

ARM CYLINDER BUCKET CYLINDER
CYLINDER
<Quick connectors>
or (Option)
RH

LH
2

MAIN CONTROL VALVE (9-3) (9-1)

(30-H) (30-G)
(8-2) (10-A1) (30-A)
(30-K) (30-D)
PS
PS b1 b2 b3
LS2 M b'1 B1 A1 b'2 B2 A2 b'3 B3 A3 b'4 b4 B4 A4 b'5 b5 B5 A5 b6 B6 A6 b7 B7 A7 b9 B9 A9 b11 B11 A11
P1
P3
LS1
TRAVEL TRAVEL BOOM ARM BUCKET DOZER BOOM AUX.1 SWING
RH LH SWING

T1

T B A T T B A T T B A T T B T B A T T B A T
Y1 T3
a1 a2 a'2 a3 a'3 a4 a'4 a5 a6 a7 a9 a11
a'1 a'5
(9-4) (9-2) (30-J) (30-L) (30-E) (30-F) (8-1) (10-A2) (30-B)

T6 T5 T4 T3 T2 T1
2 EPPR (2-b9) (2-a9) BOOM SWING TRAVEL
T7
VALVE A1 A2
L/H R/H
A
LH RH FW BW FW BW
P4 P3 P2 P1 BLOCK(A)
P
SOL VALVE MAIN PUMP X P T
T
A
BLOCK(B) DOZER
LS V/V Grab Grab T 3
FLOATING
Release Clamp 1 P T 2 2 P 1 4
R1 C2 C3 C4 C5 SOLENOID
C1 & (2-a2) (2-b2) (2-a1) (2-b1)
P T Breaker
R2 (2-a7) (2-b7) VALVE
R3 PC V/V D2
D1 D3 D4 D5

B1 G

SWING ARM BOOM BUCKET DOZER

(Tank-T4)
R2 R1 RH LH IN OUT UP DOWN IN OUT DOWN UP
T1 PILOT
T2 (11-T) T
T3 FILTER
T4 (34-T) P1 P2 In Out A1 ACC A2
T5 B2
(3-V)
G TRAVEL
SAFETY
E RELIEF SPEED 3 P 1 4 T 2 2 P 4 3 T 1 1 P T 2
VAVLE
P2
S1 P1
HYDRAULIC S L2 L1 L
T
TANK B C A L K H J E D G F
SOLENOID
(2-a4) (2-b3) (2-a5) (2-b6) (2-a6)
(Tank-T2)
VALVE ASSY (2-a11) (2-b11) (2-b4) (2-a3) (2-b5)

TERMINAL

85A3HC02

The pilot pump receive oil from the hydraulic tank. The discharged oil from the pilot pump flows to
the safety solenoid valve through the line filter. The oil is filtered by the line filter. The pilot relief valve
is provided in the pilot line for limiting the pilot circuit pressure.
The oil filtered by line filter flows remote control valve through safety solenoid valve.
The return oil flow into the hydraulic tank.

3-8
 2. SAFETY VALVE (SAFETY LEVER)
DOZER
CYLINDER
TRAVEL MOTOR(LH) TRAVEL MOTOR(RH)
SWING MOTOR DR V RED RED
(Tank-T5)
P3
RED P2 P3 P2
D2
D1 D2
D1
G.P2 D C G.P1
P P

B Pi A

Dr E A B C D F H G TURNING JOINT

PP PB A T B
(CCW) (CW)
P1 P1 P4
P4
A B B A
(BW) (FW) (BW) (FW)

BOOM CYLINDER BOOM SWING <2-Way> <Breaker>

ARM CYLINDER BUCKET CYLINDER
CYLINDER
<Quick connectors>
or (Option)
RH

LH
2

MAIN CONTROL VALVE (9-3) (9-1)

(30-H) (30-G)
(8-2) (10-A1) (30-A)
(30-K) (30-D)
PS
PS b1 b2 b3
LS2 M b'1 B1 A1 b'2 B2 A2 b'3 B3 A3 b'4 b4 B4 A4 b'5 b5 B5 A5 b6 B6 A6 b7 B7 A7 b9 B9 A9 b11 B11 A11
P1
P3
LS1
TRAVEL TRAVEL BOOM ARM BUCKET DOZER BOOM AUX.1 SWING
RH LH SWING

T1

T B A T T B A T T B A T T B T B A T T B A T
Y1 T3
a1 a2 a'2 a3 a'3 a4 a'4 a5 a6 a7 a9 a11
a'1 a'5
(9-4) (9-2) (30-J) (30-L) (30-E) (30-F) (8-1) (10-A2) (30-B)

T6 T5 T4 T3 T2 T1
2 EPPR (2-b9) (2-a9) BOOM SWING TRAVEL
T7
(Tank-T3)
VALVE A1 A2
L/H R/H
A
LH RH FW BW FW BW
P4 P3 P2 P1 BLOCK(A)
P
SOL VALVE MAIN PUMP X P T
T
A
BLOCK(B) DOZER
LS V/V Grab Grab T 3
FLOATING
Release Clamp 1 P T 2 2 P 1 4
R1 C2 C3 C4 C5 SOLENOID
C1 & (2-a2) (2-b2) (2-a1) (2-b1)
P T Breaker
R2 (2-a7) (2-b7) VALVE
PC V/V (32-D2)
R3 D1 D2 D3 D4 D5

(Tank-T1)
B1 G

SWING ARM BOOM BUCKET DOZER

(Tank-T4)
R2 R1 RH LH IN OUT UP DOWN IN OUT DOWN UP
T1 (32-D5) PILOT
T2 (11-T) T
T3 (31-T7) FILTER
T4 (34-T) P1 P2 In Out A1 ACC A2
T5 B2
(3-V)
G TRAVEL
SAFETY
E RELIEF SPEED 3 P 1 4 T 2 2 P 4 3 T 1 1 P T 2
VAVLE
P2
S1 P1
HYDRAULIC S L2 L1 L
T
TANK B C A L K H J E D G F
SOLENOID
(2-a4) (2-b3) (2-a5) (2-b6) (2-a6)
(Tank-T2)
VALVE ASSY (2-a11) (2-b11) (2-b4) (2-a3) (2-b5)

TERMINAL

85A3HC03

When the lever of the safety solenoid valve is moved downward, oil flows into the remote control
valve through solenoid valve and line filter.
When the lever of the safety solenoid valve is moved upward, oil does not flow into the remote
control valve, because of the blocked port.

3-9
 3. TRAVEL SPEED CONTROL SYSTEM
DOZER
CYLINDER
TRAVEL MOTOR(LH) TRAVEL MOTOR(RH)
SWING MOTOR DR V RED RED
(Tank-T5)
P3
RED P2 P3 P2
D2
D1 D2
D1
G.P2 D C G.P1
P P

B Pi A

Dr E A B C D F H G TURNING JOINT

PP PB A T B
(CCW) (CW)
P1 P1 P4
P4
A B B A
(BW) (FW) (BW) (FW)

BOOM CYLINDER BOOM SWING <2-Way> <Breaker>

ARM CYLINDER BUCKET CYLINDER
CYLINDER
<Quick connectors>
or (Option)
RH

LH
2

MAIN CONTROL VALVE (9-3) (9-1)

(30-H) (30-G)
(8-2) (10-A1) (30-A)
(30-K) (30-D)
PS
PS b1 b2 b3
LS2 M b'1 B1 A1 b'2 B2 A2 b'3 B3 A3 b'4 b4 B4 A4 b'5 b5 B5 A5 b6 B6 A6 b7 B7 A7 b9 B9 A9 b11 B11 A11
P1
P3
LS1
TRAVEL TRAVEL BOOM ARM BUCKET DOZER BOOM AUX.1 SWING
RH LH SWING

T1

T B A T T B A T T B A T T B T B A T T B A T
Y1 T3
a1 a2 a'2 a3 a'3 a4 a'4 a5 a6 a7 a9 a11
a'1 a'5
(9-4) (9-2) (30-J) (30-L) (30-E) (30-F) (8-1) (10-A2) (30-B)

T6 T5 T4 T3 T2 T1
2 EPPR (2-b9) (2-a9) BOOM SWING TRAVEL
T7
(Tank-T3)
VALVE A1 A2
L/H R/H
A
LH RH FW BW FW BW
P4 P3 P2 P1 BLOCK(A)
P
SOL VALVE MAIN PUMP X P T
T
A
BLOCK(B) DOZER
LS V/V Grab Grab T 3
FLOATING
Release Clamp 1 P T 2 2 P 1 4
R1 C2 C3 C4 C5 SOLENOID
C1 & (2-a2) (2-b2) (2-a1) (2-b1)
P T Breaker
R2 (2-a7) (2-b7) VALVE
R3 PC V/V D2
D1 D3 D4 D5

(Tank-T1)
B1 G

SWING ARM BOOM BUCKET DOZER

(Tank-T4)
R2 R1 RH LH IN OUT UP DOWN IN OUT DOWN UP
T1 (32-D5) PILOT
T2 (11-T) T
T3 (31-T7) FILTER
T4 (34-T) P1 P2 In Out A1 ACC A2
T5 B2
(3-V)
G TRAVEL
SAFETY
E RELIEF SPEED 3 P 1 4 T 2 2 P 4 3 T 1 1 P T 2
VAVLE
P2
S1 P1
HYDRAULIC S L2 L1 L
T
TANK B C A L K H J E D G F
SOLENOID
(2-a4) (2-b3) (2-a5) (2-b6) (2-a6)
(Tank-T2)
VALVE ASSY (2-a11) (2-b11) (2-b4) (2-a3) (2-b5)

TERMINAL

85A3HC04

When the travel speed switch is pushed, the travel speed solenoid valve is actuated and the
discharged oil from the pilot pump flows to the P port of pilot valve in the travel motors.
As a result, the control piston is pushed by the main oil flow, thus the displacement is minimized.
When the travel speed switch is pushed once more, the travel speed solenoid valve is return to
original position by the force of spring, the hydraulic oil of P port returns to the hydraulic tank.
As a result, the control piston is returned by the main oil flow, thus the displacement is maximized.

3-10
 4. SWING PARKING BRAKE RELEASE
DOZER
CYLINDER
TRAVEL MOTOR(LH) TRAVEL MOTOR(RH)
SWING MOTOR DR V RED RED
(Tank-T5)
P3
RED P2 P3 P2
D2
D1 D2
D1
G.P2 D C G.P1
P P

B Pi A

Dr E A B C D F H G TURNING JOINT

PP PB A T B
(CCW) (CW)
P1 P1 P4
P4
A B B A
(BW) (FW) (BW) (FW)

BOOM CYLINDER BOOM SWING <2-Way> <Breaker>

ARM CYLINDER BUCKET CYLINDER
CYLINDER
<Quick connectors>
or (Option)
RH

LH
2

MAIN CONTROL VALVE (9-3) (9-1)

(30-H) (30-G)
(8-2) (10-A1) (30-A)
(30-K) (30-D)
PS
PS b1 b2 b3
LS2 M b'1 B1 A1 b'2 B2 A2 b'3 B3 A3 b'4 b4 B4 A4 b'5 b5 B5 A5 b6 B6 A6 b7 B7 A7 b9 B9 A9 b11 B11 A11
P1
P3
LS1
TRAVEL TRAVEL BOOM ARM BUCKET DOZER BOOM AUX.1 SWING
RH LH SWING

T1

T B A T T B A T T B A T T B T B A T T B A T
Y1 T3
a1 a2 a'2 a3 a'3 a4 a'4 a5 a6 a7 a9 a11
a'1 a'5
(9-4) (9-2) (30-J) (30-L) (30-E) (30-F) (8-1) (10-A2) (30-B)

T6 T5 T4 T3 T2 T1
2 EPPR (2-b9) (2-a9) BOOM SWING TRAVEL
T7
(Tank-T3)
VALVE A1 A2
L/H R/H
A
LH RH FW BW FW BW
P4 P3 P2 P1 BLOCK(A)
P
SOL VALVE MAIN PUMP X P T
T
A
BLOCK(B) DOZER
LS V/V Grab Grab T 3
FLOATING
Release Clamp 1 P T 2 2 P 1 4
R1 C2 C3 C4 C5 SOLENOID
C1 & (2-a2) (2-b2) (2-a1) (2-b1)
P T Breaker
R2 (2-a7) (2-b7) VALVE
R3 PC V/V D2
D1 D3 D4 D5

(Tank-T1)
B1 G

SWING ARM BOOM BUCKET DOZER

(Tank-T4)
R2 R1 RH LH IN OUT UP DOWN IN OUT DOWN UP
T1 (32-D5) PILOT
T2 (11-T) T
T3 (31-T7) FILTER
T4 (34-T) P1 P2 In Out A1 ACC A2
T5 B2
(3-V)
G TRAVEL
SAFETY
E RELIEF SPEED 3 P 1 4 T 2 2 P 4 3 T 1 1 P T 2
VAVLE
P2
S1 P1
HYDRAULIC S L2 L1 L
T
TANK B C A L K H J E D G F
SOLENOID
(2-a4) (2-b3) (2-a5) (2-b6) (2-a6)
(Tank-T2)
VALVE ASSY (2-a11) (2-b11) (2-b4) (2-a3) (2-b5)

TERMINAL

85A3HC05

When the swing control lever is tilted, the pilot oil flow into PP port of shuttle valve, this pressure
move spool so, discharged oil from pilot valve flow into PB port.
This pressure is applied to swing motor disc, thus the brake is released.
When the swing control lever is set in the neutral position, oil in the swing motor disc cylinder is
drained, thus the brake is applied.

3-11
 GROUP 4 SINGLE OPERATION

1. BOOM UP OPERATION
DOZER
CYLINDER
TRAVEL MOTOR(LH) TRAVEL MOTOR(RH)
SWING MOTOR DR V RED RED
(Tank-T5)
P3
RED P2 P3 P2
D2
D1 D2
D1
G.P2 D C G.P1
P P

B Pi A

Dr E A B C D F H G TURNING JOINT

PP PB A T B
(CCW) (CW)
P1 P1 P4
P4
A B B A
(BW) (FW) (BW) (FW)

BOOM CYLINDER BOOM SWING <2-Way> <Breaker>

ARM CYLINDER BUCKET CYLINDER
CYLINDER
<Quick connectors>
or (Option)
RH

LH
2

MAIN CONTROL VALVE (9-3) (9-1)

(30-H) (30-G)
(8-2) (10-A1) (30-A)
(30-K) (30-D)
PS
PS b1 b2 b3
LS2 M b'1 B1 A1 b'2 B2 A2 b'3 B3 A3 b'4 b4 B4 A4 b'5 b5 B5 A5 b6 B6 A6 b7 B7 A7 b9 B9 A9 b11 B11 A11
P1
P3
LS1
TRAVEL TRAVEL BOOM ARM BUCKET DOZER BOOM AUX.1 SWING
RH LH SWING

T1

T B A T T B A T T B A T T B T B A T T B A T
Y1 T3
a1 a2 a'2 a3 a'3 a4 a'4 a5 a6 a7 a9 a11
a'1 a'5
(9-4) (9-2) (30-J) (30-L) (30-E) (30-F) (8-1) (10-A2) (30-B)

T6 T5 T4 T3 T2 T1
2 EPPR (2-b9) (2-a9) BOOM SWING TRAVEL
T7
(Tank-T3)
VALVE A1 A2
L/H R/H
A
LH RH FW BW FW BW
P4 P3 P2 P1 BLOCK(A)
P
SOL VALVE MAIN PUMP X P T
T
A
BLOCK(B) DOZER
LS V/V Grab Grab T 3
FLOATING
Release Clamp 1 P T 2 2 P 1 4
R1 C2 C3 C4 C5 SOLENOID
C1 & (2-a2) (2-b2) (2-a1) (2-b1)
P T Breaker
R2 (2-a7) (2-b7) VALVE
R3 PC V/V D2
D1 D3 D4 D5

(Tank-T1)
B1 G

SWING ARM BOOM BUCKET DOZER

(Tank-T4)
R2 R1 RH LH IN OUT UP DOWN IN OUT DOWN UP
T1 (32-D5) PILOT
T2 (11-T) T
T3 (31-T7) FILTER
T4 (34-T) P1 P2 In Out A1 ACC A2
T5 B2
(3-V)
G TRAVEL
SAFETY
E RELIEF SPEED 3 P 1 4 T 2 2 P 4 3 T 1 1 P T 2
VAVLE
P2
S1 P1
HYDRAULIC S L2 L1 L
T
TANK B C A L K H J E D G F
SOLENOID (2-a6)
(Tank-T2) (2-a4) (2-b3) (2-a5) (2-b6)
VALVE ASSY (2-a11) (2-b11) (2-b4) (2-a3) (2-b5)

TERMINAL

85A3HC10

When the right control lever is pulled back, the boom spool in the main control valve is moved to the
up position by the pilot oil pressure from the remote control valve.
The oil from the main pump flows into the main control valve and then goes to the large chamber of
boom cylinder. At the same time, the oil from the small chamber of boom cylinder returns to the
hydraulic oil tank through the boom spool in the main control valve. When this happens, the boom
goes up. The excessive pressure in the boom cylinder bottom end circuit is prevented by relief valve.
When the boom is up and the control lever is returned to neutral position, the circuit for the holding
pressure at the bottom end of the boom cylinder is closed by the boom holding valve. This prevents
the hydraulic drift of boom cylinder.

3-12
 2. BOOM DOWN OPERATION
DOZER
CYLINDER
TRAVEL MOTOR(LH) TRAVEL MOTOR(RH)
SWING MOTOR DR V RED RED
(Tank-T5)
P3
RED P2 P3 P2
D2
D1 D2
D1
G.P2 D C G.P1
P P

B Pi A

Dr E A B C D F H G TURNING JOINT

PP PB A T B
(CCW) (CW)
P1 P1 P4
P4
A B B A
(BW) (FW) (BW) (FW)

BOOM CYLINDER BOOM SWING <2-Way> <Breaker>

ARM CYLINDER BUCKET CYLINDER
CYLINDER
<Quick connectors>
or (Option)
RH

LH
2

MAIN CONTROL VALVE (9-3) (9-1)

(30-H) (30-G)
(8-2) (10-A1) (30-A)
(30-K) (30-D)
PS
PS b1 b2 b3
LS2 M b'1 B1 A1 b'2 B2 A2 b'3 B3 A3 b'4 b4 B4 A4 b'5 b5 B5 A5 b6 B6 A6 b7 B7 A7 b9 B9 A9 b11 B11 A11
P1
P3
LS1
TRAVEL TRAVEL BOOM ARM BUCKET DOZER BOOM AUX.1 SWING
RH LH SWING

T1

T B A T T B A T T B A T T B T B A T T B A T
Y1 T3
a1 a2 a'2 a3 a'3 a4 a'4 a5 a6 a7 a9 a11
a'1 a'5
(9-4) (9-2) (30-J) (30-L) (30-E) (30-F) (8-1) (10-A2) (30-B)

T6 T5 T4 T3 T2 T1
2 EPPR (2-b9) (2-a9) BOOM SWING TRAVEL
T7
(Tank-T3)
VALVE A1 A2
L/H R/H
A
LH RH FW BW FW BW
P4 P3 P2 P1 BLOCK(A)
P
SOL VALVE MAIN PUMP X P T
T
A
BLOCK(B) DOZER
LS V/V Grab Grab T 3
FLOATING
Release Clamp 1 P T 2 2 P 1 4
R1 C2 C3 C4 C5 SOLENOID
C1 & (2-a2) (2-b2) (2-a1) (2-b1)
P T Breaker
R2 (2-a7) (2-b7) VALVE
R3 PC V/V D2
D1 D3 D4 D5

(Tank-T1)
B1 G

SWING ARM BOOM BUCKET DOZER

(Tank-T4)
R2 R1 RH LH IN OUT UP DOWN IN OUT DOWN UP
T1 (32-D5) PILOT
T2 (11-T) T
T3 (31-T7) FILTER
T4 (34-T) P1 P2 In Out A1 ACC A2
T5 B2
(3-V)
G TRAVEL
SAFETY
E RELIEF SPEED 3 P 1 4 T 2 2 P 4 3 T 1 1 P T 2
VAVLE
P2
S1 P1
HYDRAULIC S L2 L1 L
T
TANK B C A L K H J E D G F
SOLENOID (2-a6)
(Tank-T2) (2-a4) (2-b3) (2-a5) (2-b6)
VALVE ASSY (2-a11) (2-b11) (2-b4) (2-a3) (2-b5)

TERMINAL

85A3HC11

When the right control lever is pushed forward, the boom spool in the main control valve is moved to
the down position by the pilot oil pressure from the remote control valve.
The oil from the main pump flows into the main control valve and then goes to the small chamber of
boom cylinder. At the same time, the oil from the large chamber of boom cylinder returns to the
hydraulic tank through the boom spool in the main control valve.
The excessive pressure in the boom cylinder rod end circuit is prevented by the relief valve.

3-13
 3. ARM ROLL IN OPERATION
DOZER
CYLINDER
TRAVEL MOTOR(LH) TRAVEL MOTOR(RH)
SWING MOTOR DR V RED RED
(Tank-T5)
P3
RED P2 P3 P2
D2
D1 D2
D1
G.P2 D C G.P1
P P

B Pi A

Dr E A B C D F H G TURNING JOINT

PP PB A T B
(CCW) (CW)
P1 P1 P4
P4
A B B A
(BW) (FW) (BW) (FW)

BOOM CYLINDER BOOM SWING <2-Way> <Breaker>

ARM CYLINDER BUCKET CYLINDER
CYLINDER
<Quick connectors>
or (Option)
RH

LH
2

MAIN CONTROL VALVE (9-3) (9-1)

(30-H) (30-G)
(8-2) (10-A1) (30-A)
(30-K) (30-D)
PS
PS b1 b2 b3
LS2 M b'1 B1 A1 b'2 B2 A2 b'3 B3 A3 b'4 b4 B4 A4 b'5 b5 B5 A5 b6 B6 A6 b7 B7 A7 b9 B9 A9 b11 B11 A11
P1
P3
LS1
TRAVEL TRAVEL BOOM ARM BUCKET DOZER BOOM AUX.1 SWING
RH LH SWING

T1

T B A T T B A T T B A T T B T B A T T B A T
Y1 T3
a1 a2 a'2 a3 a'3 a4 a'4 a5 a6 a7 a9 a11
a'1 a'5
(9-4) (9-2) (30-J) (30-L) (30-E) (30-F) (8-1) (10-A2) (30-B)

T7 T6 T5 T4 T3 T2 T1
2 EPPR (2-b9) (2-a9) BOOM SWING TRAVEL
(Tank-T3)
VALVE A1 A2
L/H R/H
A
LH RH FW BW FW BW
P4 P3 P2 P1 BLOCK(A)
P
SOL VALVE MAIN PUMP X P T
T
A
BLOCK(B) DOZER
LS V/V Grab Grab T 3
FLOATING
Release Clamp 1 P T 2 2 P 1 4
R1 C2 C3 C4 C5 SOLENOID
C1 & (2-a2) (2-b2) (2-a1) (2-b1)
P T Breaker
R2 (2-a7) (2-b7) VALVE
R3 PC V/V D2
D1 D3 D4 D5

(Tank-T1)
B1 G

SWING ARM BOOM BUCKET DOZER

(Tank-T4)
R2 R1 RH LH IN OUT UP DOWN IN OUT DOWN UP
T1 (32-D5) PILOT
T2 (11-T) T
T3 (31-T7) FILTER
T4 (34-T) P1 P2 In Out A1 ACC A2
T5 B2
(3-V)
G TRAVEL
SAFETY
E RELIEF SPEED 3 P 1 4 T 2 2 P 4 3 T 1 1 P T 2
VAVLE
P2
S1 P1
HYDRAULIC S L2 L1 L
T
TANK B C A L K H J E D G F
SOLENOID (2-a6)
(Tank-T2) (2-a4) (2-b3) (2-a5) (2-b6)
VALVE ASSY (2-a11) (2-b11) (2-b4) (2-a3) (2-b5)

TERMINAL

85A3HC12

When the left control lever is pulled back, the arm spool in the main control valve is moved the to roll
in position by the pilot oil pressure from the remote control valve.
The oil from the main pump flows into the main control valve and then goes to the large chamber of
arm cylinder.
At the same time, the oil from small chamber of arm cylinder returns to the hydraulic oil tank through
the arm spool in the main control valve. When this happens, the arm rolls in.
The cavitation which will happen to the bottom of the arm cylinder is also prevented by the make-up
valve in the main control valve.

3-14
 4. ARM ROLL OUT OPERATION
DOZER
CYLINDER
TRAVEL MOTOR(LH) TRAVEL MOTOR(RH)
SWING MOTOR DR V RED RED
(Tank-T5)
P3
RED P2 P3 P2
D2
D1 D2
D1
G.P2 D C G.P1
P P

B Pi A

Dr E A B C D F H G TURNING JOINT

PP PB A T B
(CCW) (CW)
P1 P1 P4
P4
A B B A
(BW) (FW) (BW) (FW)

BOOM CYLINDER BOOM SWING <2-Way> <Breaker>

ARM CYLINDER BUCKET CYLINDER
CYLINDER
<Quick connectors>
or (Option)
RH

LH
2

MAIN CONTROL VALVE (9-3) (9-1)

(30-H) (30-G)
(8-2) (10-A1) (30-A)
(30-K) (30-D)
PS
PS b1 b2 b3
LS2 M b'1 B1 A1 b'2 B2 A2 b'3 B3 A3 b'4 b4 B4 A4 b'5 b5 B5 A5 b6 B6 A6 b7 B7 A7 b9 B9 A9 b11 B11 A11
P1
P3
LS1
TRAVEL TRAVEL BOOM ARM BUCKET DOZER BOOM AUX.1 SWING
RH LH SWING

T1

T B A T T B A T T B A T T B T B A T T B A T
Y1 T3
a1 a2 a'2 a3 a'3 a4 a'4 a5 a6 a7 a9 a11
a'1 a'5
(9-4) (9-2) (30-J) (30-L) (30-E) (30-F) (8-1) (10-A2) (30-B)

T7 T6 T5 T4 T3 T2 T1
2 EPPR (2-b9) (2-a9) BOOM SWING TRAVEL
(Tank-T3)
VALVE A1 A2
L/H R/H
A
LH RH FW BW FW BW
P4 P3 P2 P1 BLOCK(A)
P
SOL VALVE MAIN PUMP X P T
T
A
BLOCK(B) DOZER
LS V/V Grab Grab T 3
FLOATING
Release Clamp 1 P T 2 2 P 1 4
R1 C2 C3 C4 C5 SOLENOID
C1 & (2-a2) (2-b2) (2-a1) (2-b1)
P T Breaker
R2 (2-a7) (2-b7) VALVE
R3 PC V/V D2
D1 D3 D4 D5

(Tank-T1)
B1 G

SWING ARM BOOM BUCKET DOZER

(Tank-T4)
R2 R1 RH LH IN OUT UP DOWN IN OUT DOWN UP
T1 (32-D5) PILOT
T2 (11-T) T
T3 (31-T7) FILTER
T4 (34-T) P1 P2 In Out A1 ACC A2
T5 B2
(3-V)
G TRAVEL
SAFETY
E RELIEF SPEED 3 P 1 4 T 2 2 P 4 3 T 1 1 P T 2
VAVLE
P2
S1 P1
HYDRAULIC S L2 L1 L
T
TANK B C A L K H J E D G F
SOLENOID (2-a6)
(Tank-T2) (2-a4) (2-b3) (2-a5) (2-b6)
VALVE ASSY (2-a11) (2-b11) (2-b4) (2-a3) (2-b5)

TERMINAL

85A3HC13

When the left control lever is pushed forward, the arm spool in the main control valve is moved to the
roll out position by the pilot oil pressure from the remote control valve.
The oil from the main pump flows into the main control valve and then goes to the small chamber of
arm cylinder.
At the same time, the oil from the large chamber of arm cylinder returns to the hydraulic oil tank
through the arm spool in the main control valve. When this happens, the arm rolls out.
The cavitation which will happen to the rod of the arm cylinder is also prevented by the make-up
valve in the main control valve.

3-15
 5. BUCKET ROLL IN OPERATION
DOZER
CYLINDER
TRAVEL MOTOR(LH) TRAVEL MOTOR(RH)
SWING MOTOR DR V RED RED
(Tank-T5)
P3
RED P2 P3 P2
D2
D1 D2
D1
G.P2 D C G.P1
P P

B Pi A

Dr E A B C D F H G TURNING JOINT

PP PB A T B
(CCW) (CW)
P1 P1 P4
P4
A B B A
(BW) (FW) (BW) (FW)

BOOM CYLINDER BOOM SWING <2-Way> <Breaker>

ARM CYLINDER BUCKET CYLINDER
CYLINDER
<Quick connectors>
or (Option)
RH

LH
2

MAIN CONTROL VALVE (9-3) (9-1)

(30-H) (30-G)
(8-2) (10-A1) (30-A)
(30-K) (30-D)
PS
PS b1 b2 b3
LS2 M b'1 B1 A1 b'2 B2 A2 b'3 B3 A3 b'4 b4 B4 A4 b'5 b5 B5 A5 b6 B6 A6 b7 B7 A7 b9 B9 A9 b11 B11 A11
P1
P3
LS1
TRAVEL TRAVEL BOOM ARM BUCKET DOZER BOOM AUX.1 SWING
RH LH SWING

T1

T B A T T B A T T B A T T B T B A T T B A T
Y1 T3
a1 a2 a'2 a3 a'3 a4 a'4 a5 a6 a7 a9 a11
a'1 a'5
(9-4) (9-2) (30-J) (30-L) (30-E) (30-F) (8-1) (10-A2) (30-B)

T7 T6 T5 T4 T3 T2 T1
2 EPPR (2-b9) (2-a9) BOOM SWING TRAVEL
(Tank-T3)
VALVE A1 A2
L/H R/H
A
LH RH FW BW FW BW
P4 P3 P2 P1 BLOCK(A)
P
SOL VALVE MAIN PUMP X P T
T
A
BLOCK(B) DOZER
LS V/V Grab Grab T 3
FLOATING
Release Clamp 1 P T 2 2 P 1 4
R1 C2 C3 C4 C5 SOLENOID
C1 & (2-a2) (2-b2) (2-a1) (2-b1)
P T Breaker
R2 (2-a7) (2-b7) VALVE
R3 PC V/V D2
D1 D3 D4 D5

(Tank-T1)
B1 G

SWING ARM BOOM BUCKET DOZER

(Tank-T4)
R2 R1 RH LH IN OUT UP DOWN IN OUT DOWN UP
T1 (32-D5) PILOT
T2 (11-T) T
T3 (31-T7) FILTER
T4 (34-T) P1 P2 In Out A1 ACC A2
T5 B2
(3-V)
G TRAVEL
SAFETY
E RELIEF SPEED 3 P 1 4 T 2 2 P 4 3 T 1 1 P T 2
VAVLE
P2
S1 P1
HYDRAULIC S L2 L1 L
T
TANK B C A L K H J E D G F
SOLENOID (2-a6)
(Tank-T2) (2-a4) (2-b3) (2-a5) (2-b6)
VALVE ASSY (2-a11) (2-b11) (2-b4) (2-a3) (2-b5)

TERMINAL

85A3HC14

When the right control lever is pulled left, the bucket spool in the main control valve is moved to the
roll in position by the pilot oil pressure from the remote control valve.
The oil from the main pump flows into the main control valve and then goes to the large chamber of
bucket cylinder.
At the same time, the oil from the small chamber of bucket cylinder returns to the hydraulic oil tank
through the bucket spool in the main control valve. When this happens, the bucket rolls in.
The cavitation which will happen to the bottom of the bucket cylinder is also prevented by the make-
up valve in the main control valve.

3-16
 6. BUCKET ROLL OUT OPERATION
DOZER
CYLINDER
TRAVEL MOTOR(LH) TRAVEL MOTOR(RH)
SWING MOTOR DR V RED RED
(Tank-T5)
P3
RED P2 P3 P2
D2
D1 D2
D1
G.P2 D C G.P1
P P

B Pi A

Dr E A B C D F H G TURNING JOINT

PP PB A T B
(CCW) (CW)
P1 P1 P4
P4
A B B A
(BW) (FW) (BW) (FW)

BOOM CYLINDER BOOM SWING <2-Way> <Breaker>

ARM CYLINDER BUCKET CYLINDER
CYLINDER
<Quick connectors>
or (Option)
RH

LH
2

MAIN CONTROL VALVE (9-3) (9-1)

(30-H) (30-G)
(8-2) (10-A1) (30-A)
(30-K) (30-D)
PS
PS b1 b2 b3
LS2 M b'1 B1 A1 b'2 B2 A2 b'3 B3 A3 b'4 b4 B4 A4 b'5 b5 B5 A5 b6 B6 A6 b7 B7 A7 b9 B9 A9 b11 B11 A11
P1
P3
LS1
TRAVEL TRAVEL BOOM ARM BUCKET DOZER BOOM AUX.1 SWING
RH LH SWING

T1

T B A T T B A T T B A T T B T B A T T B A T
Y1 T3
a1 a2 a'2 a3 a'3 a4 a'4 a5 a6 a7 a9 a11
a'1 a'5
(9-4) (9-2) (30-J) (30-L) (30-E) (30-F) (8-1) (10-A2) (30-B)

T7 T6 T5 T4 T3 T2 T1
2 EPPR (2-b9) (2-a9) BOOM SWING TRAVEL
(Tank-T3)
VALVE A1 A2
L/H R/H
A
LH RH FW BW FW BW
P4 P3 P2 P1 BLOCK(A)
P
SOL VALVE MAIN PUMP X P T
T
A
BLOCK(B) DOZER
LS V/V Grab Grab T 3
FLOATING
Release Clamp 1 P T 2 2 P 1 4
R1 C2 C3 C4 C5 SOLENOID
C1 & (2-a2) (2-b2) (2-a1) (2-b1)
P T Breaker
R2 (2-a7) (2-b7) VALVE
R3 PC V/V D2
D1 D3 D4 D5

(Tank-T1)
B1 G

SWING ARM BOOM BUCKET DOZER

(Tank-T4)
R2 R1 RH LH IN OUT UP DOWN IN OUT DOWN UP
T1 (32-D5) PILOT
T2 (11-T) T
T3 (31-T7) FILTER
T4 (34-T) P1 P2 In Out A1 ACC A2
T5 B2
(3-V)
G TRAVEL
SAFETY
E RELIEF SPEED 3 P 1 4 T 2 2 P 4 3 T 1 1 P T 2
VAVLE
P2
S1 P1
HYDRAULIC S L2 L1 L
T
TANK B C A L K H J E D G F
SOLENOID (2-a6)
(Tank-T2) (2-a4) (2-b3) (2-a5) (2-b6)
VALVE ASSY (2-a11) (2-b11) (2-b4) (2-a3) (2-b5)

TERMINAL

85A3HC15

When the right control lever is pushed right, the bucket spool in the main control valve is moved to
the roll out position by the pilot oil pressure from the remote control valve.
The oil from the main pump flows into the main control valve and then goes to the small chamber of
bucket cylinder.
At the same time, the oil from the large chamber of bucket cylinder returns to the hydraulic oil tank
through the bucket spool in the main control valve. When this happens, the bucket rolls out.
The cavitation which will happen to the rod of the bucket cylinder is also prevented by the make-up
valve in the main control valve.

3-17
 7. SWING OPERATION
DOZER
CYLINDER
TRAVEL MOTOR(LH) TRAVEL MOTOR(RH)
SWING MOTOR DR V RED RED
(Tank-T5)
P3
RED P2 P3 P2
D2
D1 D2
D1
G.P2 D C G.P1
P P

B Pi A

Dr E A B C D F H G TURNING JOINT

PP PB A T B
(CCW) (CW)
P1 P1 P4
P4
A B B A
(BW) (FW) (BW) (FW)

BOOM CYLINDER BOOM SWING <2-Way> <Breaker>

ARM CYLINDER BUCKET CYLINDER
CYLINDER
<Quick connectors>
or (Option)
RH

LH
2

MAIN CONTROL VALVE (9-3) (9-1)

(30-H) (30-G)
(8-2) (10-A1) (30-A)
(30-K) (30-D)
PS
PS b1 b2 b3
LS2 M b'1 B1 A1 b'2 B2 A2 b'3 B3 A3 b'4 b4 B4 A4 b'5 b5 B5 A5 b6 B6 A6 b7 B7 A7 b9 B9 A9 b11 B11 A11
P1
P3
LS1
TRAVEL TRAVEL BOOM ARM BUCKET DOZER BOOM AUX.1 SWING
RH LH SWING

T1

T B A T T B A T T B A T T B T B A T T B A T
Y1 T3
a1 a2 a'2 a3 a'3 a4 a'4 a5 a6 a7 a9 a11
a'1 a'5
(9-4) (9-2) (30-J) (30-L) (30-E) (30-F) (8-1) (10-A2) (30-B)

T7 T6 T5 T4 T3 T2 T1
2 EPPR (2-b9) (2-a9) BOOM SWING TRAVEL
(Tank-T3)
VALVE A1 A2
L/H R/H
A
LH RH FW BW FW BW
P4 P3 P2 P1 BLOCK(A)
P
SOL VALVE MAIN PUMP X P T
T
A
BLOCK(B) DOZER
LS V/V Grab Grab T 3
FLOATING
Release Clamp 1 P T 2 2 P 1 4
R1 C2 C3 C4 C5 SOLENOID
C1 & (2-a2) (2-b2) (2-a1) (2-b1)
P T Breaker
R2 (2-a7) (2-b7) VALVE
R3 PC V/V D2
D1 D3 D4 D5

(Tank-T1)
B1 G

SWING ARM BOOM BUCKET DOZER

(Tank-T4)
R2 R1 RH LH IN OUT UP DOWN IN OUT DOWN UP
T1 (32-D5) PILOT
T2 (11-T) T
T3 (31-T7) FILTER
T4 (34-T) P1 P2 In Out A1 ACC A2
T5 B2
(3-V)
G TRAVEL
SAFETY
E RELIEF SPEED 3 P 1 4 T 2 2 P 4 3 T 1 1 P T 2
VAVLE
P2
S1 P1
HYDRAULIC S L2 L1 L
T
TANK B C A L K H J E D G F
SOLENOID (2-a6)
(Tank-T2) (2-a4) (2-b3) (2-a5) (2-b6)
VALVE ASSY (2-a11) (2-b11) (2-b4) (2-a3) (2-b5)

TERMINAL

85A3HC16

When the left control lever is pushed left or right, the swing spool in the main control valve is moved
to the left or right swing position by the pilot oil pressure from the remote control valve.
The oil from the main pump flows into the main control valve and then goes to the swing motor.
At the same time, the return oil from the swing motor returns to the hydraulic oil tank through the
swing spool in the main control valve. When this happens, the superstructure swings to the left or
right. The swing parking brake, make up valve and the overload relief valve are provided in the
swing motors. The cavitation which will happen to the swing motor is also prevented by the make up
valve in the swing motor itself.

3-18
SWING CIRCUIT OPERATION

SWING MOTOR DEVICE

DR V
(Tank-T5)
PARKING BRAKE RED

BRAKE ON
MOTOR BRAKE VALVE
BRAKE OFF

BRAKE RELEASE VALVE

MAKE UP VALVE

PP PB (CCW) A T B (CW)
MAKE UP
PORT

TO/FROM MAIN CONTROL VALVE

85A3HC17

1) MOTOR BRAKE VALVE

Motor brake valve for the swing motor limits to cushion the starting and stopping pressure of swing
operation.
2) MAKE UP VALVE
The make up valves prevent cavitation by supplying return oil to the vacuum side of the motor.
3) PARKING BRAKE
In case that the parking, of the machine at slope is required during operation, there is the danger of
involuntary swing caused by the self weight of the machine. The brake is connected to prevent
this involuntary swing.
PARKING BRAKE "OFF" OPERATION
The parking brake is released by the pilot pressure oil from the pilot pump.
When the left control lever placed in the swing position, the pilot pressure (PP) at the shuttle valve
is transferred to the brake release valve and the brake release valve is change over. Then the pilot
pressure (PB) lift the brake piston and release the parking brake.
PARKING BRAKE "ON" OPERATION
When the control lever placed in the neutral position, the pressure of the pilot oil passage down.
Then the brake release valve returned to the neutral position and the oil is returned from the brake
piston to the tank. And the brake is set to 'ON".

3-19
 8. TRAVEL FORWARD AND REVERSE
REVERSE OPERATION
OPERATION
DOZER
CYLINDER
TRAVEL MOTOR(LH) TRAVEL MOTOR(RH)
SWING MOTOR DR V RED RED
(Tank-T5)
P3
RED P2 P3 P2
D2
D1 D2
D1
G.P2 D C G.P1
P P

B Pi A

Dr E A B C D F H G TURNING JOINT

PP PB A T B
(CCW) (CW)
P1 P1 P4
P4
A B B A
(BW) (FW) (BW) (FW)

BOOM CYLINDER BOOM SWING <2-Way> <Breaker>

ARM CYLINDER BUCKET CYLINDER
CYLINDER
<Quick connectors>
or (Option)
RH

LH
2

MAIN CONTROL VALVE (9-3) (9-1)

(30-H) (30-G)
(8-2) (10-A1) (30-A)
(30-K) (30-D)
PS
PS b1 b2 b3
LS2 M b'1 B1 A1 b'2 B2 A2 b'3 B3 A3 b'4 b4 B4 A4 b'5 b5 B5 A5 b6 B6 A6 b7 B7 A7 b9 B9 A9 b11 B11 A11
P1
P3
LS1
TRAVEL TRAVEL BOOM ARM BUCKET DOZER BOOM AUX.1 SWING
RH LH SWING

T1

T B A T T B A T T B A T T B T B A T T B A T
Y1 T3
a1 a2 a'2 a3 a'3 a4 a'4 a5 a6 a7 a9 a11
a'1 a'5
(9-4) (9-2) (30-J) (30-L) (30-E) (30-F) (8-1) (10-A2) (30-B)

T7 T6 T5 T4 T3 T2 T1
2 EPPR (2-b9) (2-a9) BOOM SWING TRAVEL
(Tank-T3)
VALVE A1 A2
L/H R/H
A
LH RH FW BW FW BW
P4 P3 P2 P1 BLOCK(A)
P
SOL VALVE MAIN PUMP X P T
T
A
BLOCK(B) DOZER
LS V/V Grab Grab T 3
FLOATING
Release Clamp 1 P T 2 2 P 1 4
R1 C2 C3 C4 C5 SOLENOID
C1 & (2-a2) (2-b2) (2-a1) (2-b1)
P T Breaker
R2 (2-a7) (2-b7) VALVE
R3 PC V/V D2
D1 D3 D4 D5

(Tank-T1)
B1 G

SWING ARM BOOM BUCKET DOZER

(Tank-T4)
R2 R1 RH LH IN OUT UP DOWN IN OUT DOWN UP
T1 (32-D5) PILOT
T2 (11-T) T
T3 (31-T7) FILTER
T4 (34-T) P1 P2 In Out A1 ACC A2
T5 B2
(3-V)
G TRAVEL
SAFETY
E RELIEF SPEED 3 P 1 4 T 2 2 P 4 3 T 1 1 P T 2
VAVLE
P2
S1 P1
HYDRAULIC S L2 L1 L
T
TANK B C A L K H J E D G F
SOLENOID (2-a6)
(Tank-T2) (2-a4) (2-b3) (2-a5) (2-b6)
VALVE ASSY (2-a11) (2-b11) (2-b4) (2-a3) (2-b5)

TERMINAL

85A3HC18

When the travel levers are pushed forward or reverse position, the travel spools in the main control
valve are moved to the forward or reverse travel position by the pilot oil pressure from the remote
control valve. The oil from the main pump flows into the main control valve and then goes to the
both travel motors through the turning joint. The return oil from both travel motors returns to the
hydraulic oil tank through the turning joint and the travel spools in the main control valve. When this
happens, the machine moves to the forward or reverse.

3-20
TRAVEL CIRCUIT OPERATION
TRAVEL MOTOR

LH RH
RED RED

P2 P3 P3 P2
D2
D1 D2
D1

P P

P1 P4
P4
(BW) A B (FW) P1 (BW) B A (FW)

Overload relief valve Counter balance valve

Dr E A B C D F H G

Travel speed
solenoid valve Main control valve

85A3HC19

Valves are provided on travel motors to offer the following functions.

1) COUNTER BALANCE VALVE

When stopping the motor of slope descending, this valve to prevent the motor over run.
2) OVERLOAD RELIEF VALVE
Relief valve limit the circuit pressure below 286 kgf/cm2 (4068 psi) to prevent high pressure
generated at at time of stopping the machine. Stopping the motor, this valve sucks the oil from
lower pressure passage for preventing the negative pressure and the cavitation of the motor.

3-21
 9. DOZER UP OPERATION
DOZER
CYLINDER
TRAVEL MOTOR(LH) TRAVEL MOTOR(RH)
SWING MOTOR DR V RED RED
(Tank-T5)
P3
RED P2 P3 P2
D2
D1 D2
D1
G.P2 D C G.P1
P P

B Pi A

Dr E A B C D F H G TURNING JOINT

PP PB A T B
(CCW) (CW)
P1 P1 P4
P4
A B B A
(BW) (FW) (BW) (FW)

BOOM CYLINDER BOOM SWING <2-Way> <Breaker>

ARM CYLINDER BUCKET CYLINDER
CYLINDER
<Quick connectors>
or (Option)
RH

LH
2

MAIN CONTROL VALVE (9-3) (9-1)

(30-H) (30-G)
(8-2) (10-A1) (30-A)
(30-K) (30-D)
PS
PS b1 b2 b3
LS2 M b'1 B1 A1 b'2 B2 A2 b'3 B3 A3 b'4 b4 B4 A4 b'5 b5 B5 A5 b6 B6 A6 b7 B7 A7 b9 B9 A9 b11 B11 A11
P1
P3
LS1
TRAVEL TRAVEL BOOM ARM BUCKET DOZER BOOM AUX.1 SWING
RH LH SWING

T1

T B A T T B A T T B A T T B T B A T T B A T
Y1 T3
a1 a2 a'2 a3 a'3 a4 a'4 a5 a6 a7 a9 a11
a'1 a'5
(9-4) (9-2) (30-J) (30-L) (30-E) (30-F) (8-1) (10-A2) (30-B)

T7 T6 T5 T4 T3 T2 T1
2 EPPR (2-b9) (2-a9) BOOM SWING TRAVEL
(Tank-T3)
VALVE A1 A2
L/H R/H
A
LH RH FW BW FW BW
P4 P3 P2 P1 BLOCK(A)
P
SOL VALVE MAIN PUMP X P T
T
A
BLOCK(B) DOZER
LS V/V Grab Grab T 3
FLOATING
Release Clamp 1 P T 2 2 P 1 4
R1 C2 C3 C4 C5 SOLENOID
C1 & (2-a2) (2-b2) (2-a1) (2-b1)
P T Breaker
R2 (2-a7) (2-b7) VALVE
R3 PC V/V D2
D1 D3 D4 D5

(Tank-T1)
B1 G

SWING ARM BOOM BUCKET DOZER

(Tank-T4)
R2 R1 RH LH IN OUT UP DOWN IN OUT DOWN UP
T1 (32-D5) PILOT
T2 (11-T) T
T3 (31-T7) FILTER
T4 (34-T) P1 P2 In Out A1 ACC A2
T5 B2
(3-V)
G TRAVEL
SAFETY
E RELIEF SPEED 3 P 1 4 T 2 2 P 4 3 T 1 1 P T 2
VAVLE
P2
S1 P1
HYDRAULIC S L2 L1 L
T
TANK B C A L K H J E D G F
SOLENOID (2-a6)
(Tank-T2) (2-a4) (2-b3) (2-a5) (2-b6)
VALVE ASSY (2-a11) (2-b11) (2-b4) (2-a3) (2-b5)

TERMINAL

85A3HC20

When the dozer control lever is pulled back, the dozer spool in the main control valve is moved to
the dozer up position by the pilot oil pressure from the remote control valve.
The oil from the main pump flows into the main control valve and then goes to the small chamber of
dozer cylinders through the turning joint.
At the same time, the oil from the large chamber of dozer cylinders returns to the hydraulic oil tank
through the turning joint and dozer spool in the main control valve. When this happens, the dozer
goes up.

3-22
 10. DOZER DOWN OPERATION
DOZER
CYLINDER
TRAVEL MOTOR(LH) TRAVEL MOTOR(RH)
SWING MOTOR DR V RED RED
(Tank-T5)
P3
RED P2 P3 P2
D2
D1 D2
D1
G.P2 D C G.P1
P P

B Pi A

Dr E A B C D F H G TURNING JOINT

PP PB A T B
(CCW) (CW)
P1 P1 P4
P4
A B B A
(BW) (FW) (BW) (FW)

BOOM CYLINDER BOOM SWING <2-Way> <Breaker>

ARM CYLINDER BUCKET CYLINDER
CYLINDER
<Quick connectors>
or (Option)
RH

LH
2

MAIN CONTROL VALVE (9-3) (9-1)

(30-H) (30-G)
(8-2) (10-A1) (30-A)
(30-K) (30-D)
PS
PS b1 b2 b3
LS2 M b'1 B1 A1 b'2 B2 A2 b'3 B3 A3 b'4 b4 B4 A4 b'5 b5 B5 A5 b6 B6 A6 b7 B7 A7 b9 B9 A9 b11 B11 A11
P1
P3
LS1
TRAVEL TRAVEL BOOM ARM BUCKET DOZER BOOM AUX.1 SWING
RH LH SWING

T1

T B A T T B A T T B A T T B T B A T T B A T
Y1 T3
a1 a2 a'2 a3 a'3 a4 a'4 a5 a6 a7 a9 a11
a'1 a'5
(9-4) (9-2) (30-J) (30-L) (30-E) (30-F) (8-1) (10-A2) (30-B)

T7 T6 T5 T4 T3 T2 T1
2 EPPR (2-b9) (2-a9) BOOM SWING TRAVEL
(Tank-T3)
VALVE A1 A2
L/H R/H
A
LH RH FW BW FW BW
P4 P3 P2 P1 BLOCK(A)
P
SOL VALVE MAIN PUMP X P T
T
A
BLOCK(B) DOZER
LS V/V Grab Grab T 3
FLOATING
Release Clamp 1 P T 2 2 P 1 4
R1 C2 C3 C4 C5 SOLENOID
C1 & (2-a2) (2-b2) (2-a1) (2-b1)
P T Breaker
R2 (2-a7) (2-b7) VALVE
R3 PC V/V D2
D1 D3 D4 D5

(Tank-T1)
B1 G

SWING ARM BOOM BUCKET DOZER

(Tank-T4)
R2 R1 RH LH IN OUT UP DOWN IN OUT DOWN UP
T1 (32-D5) PILOT
T2 (11-T) T
T3 (31-T7) FILTER
T4 (34-T) P1 P2 In Out A1 ACC A2
T5 B2
(3-V)
G TRAVEL
SAFETY
E RELIEF SPEED 3 P 1 4 T 2 2 P 4 3 T 1 1 P T 2
VAVLE
P2
S1 P1
HYDRAULIC S L2 L1 L
T
TANK B C A L K H J E D G F
SOLENOID (2-a6)
(Tank-T2) (2-a4) (2-b3) (2-a5) (2-b6)
VALVE ASSY (2-a11) (2-b11) (2-b4) (2-a3) (2-b5)

TERMINAL

85A3HC21

When the dozer control lever is pushed forward, the dozer spool in the main control valve is moved
to the dozer down position by the pilot oil pressure from the remote control valve.
The oil from the main pump flows into the main control valve and then goes to the large chamber of
dozer cylinders through the turning joint.
At the same time, the oil from the small chamber of dozer cylinders returns to the hydraulic oil tank
through the turning joint and dozer spool in the main control valve. When this happens, the dozer
blade is down.

3-23
 GROUP 5 COMBINED OPERATION
1. OUTLINE
DOZER
CYLINDER
TRAVEL MOTOR(LH) TRAVEL MOTOR(RH)
SWING MOTOR DR V RED RED
(Tank-T5)
P3
RED P2 P3 P2
D2
D1 D2
D1
G.P2 D C G.P1
P P

B Pi A

Dr E A B C D F H G TURNING JOINT

PP PB A T B
(CCW) (CW)
P1 P1 P4
P4
A B B A
(BW) (FW) (BW) (FW)

BOOM CYLINDER BOOM SWING <2-Way> <Breaker>

ARM CYLINDER BUCKET CYLINDER
CYLINDER
<Quick connectors>
or (Option)
RH

LH
2

MAIN CONTROL VALVE (9-3) (9-1)

(30-H) (30-G)
(8-2) (10-A1) (30-A)
(30-K) (30-D)
PS
PS b1 b2 b3
LS2 M b'1 B1 A1 b'2 B2 A2 b'3 B3 A3 b'4 b4 B4 A4 b'5 b5 B5 A5 b6 B6 A6 b7 B7 A7 b9 B9 A9 b11 B11 A11
P1
P3
LS1
TRAVEL TRAVEL BOOM ARM BUCKET DOZER BOOM AUX.1 SWING
RH LH SWING

T1

T B A T T B A T T B A T T B T B A T T B A T
Y1 T3
a1 a2 a'2 a3 a'3 a4 a'4 a5 a6 a7 a9 a11
a'1 a'5
(9-4) (9-2) (30-J) (30-L) (30-E) (30-F) (8-1) (10-A2) (30-B)

T7 T6 T5 T4 T3 T2 T1
2 EPPR (2-b9) (2-a9) BOOM SWING TRAVEL
(Tank-T3)
VALVE A1 A2
L/H R/H
A
LH RH FW BW FW BW
P4 P3 P2 P1 BLOCK(A)
P
SOL VALVE MAIN PUMP X P T
T
A
BLOCK(B) DOZER
LS V/V Grab Grab T 3
FLOATING
Release Clamp 1 P T 2 2 P 1 4
R1 C2 C3 C4 C5 SOLENOID
C1 & (2-a2) (2-b2) (2-a1) (2-b1)
P T Breaker
R2 (2-a7) (2-b7) VALVE
R3 PC V/V D2
D1 D3 D4 D5

(Tank-T1)
B1 G

SWING ARM BOOM BUCKET DOZER

(Tank-T4)
R2 R1 RH LH IN OUT UP DOWN IN OUT DOWN UP
T1 (32-D5) PILOT
T2 (11-T) T
T3 (31-T7) FILTER
T4 (34-T) P1 P2 In Out A1 ACC A2
T5 B2
(3-V)
G TRAVEL
SAFETY
E RELIEF SPEED 3 P 1 4 T 2 2 P 4 3 T 1 1 P T 2
VAVLE
P2
S1 P1
HYDRAULIC S L2 L1 L
T
TANK B C A L K H J E D G F
SOLENOID (2-a6)
(Tank-T2) (2-a4) (2-b3) (2-a5) (2-b6)
VALVE ASSY (2-a11) (2-b11) (2-b4) (2-a3) (2-b5)

TERMINAL

85A3HC30

The oil from the main pump flows through the parallel oil passage in the main control valve. Then the
oil goes to each actuator and operates them. Check valves and orifices are located on these oil
passage in the main control valve. These control the oil from the main pumps so as to correspond to
the operation of each actuator and smooth the combined operation.

3-24
 2. COMBINED SWING AND BOOM OPERATION
DOZER
CYLINDER
TRAVEL MOTOR(LH) TRAVEL MOTOR(RH)
SWING MOTOR DR V RED RED
(Tank-T5)
P3
RED P2 P3 P2
D2
D1 D2
D1
G.P2 D C G.P1
P P

B Pi A

Dr E A B C D F H G TURNING JOINT

PP PB A T B
(CCW) (CW)
P1 P1 P4
P4
A B B A
(BW) (FW) (BW) (FW)

BOOM CYLINDER BOOM SWING <2-Way> <Breaker>

ARM CYLINDER BUCKET CYLINDER
CYLINDER
<Quick connectors>
or (Option)
RH

LH
2

MAIN CONTROL VALVE (9-3) (9-1)

(30-H) (30-G)
(8-2) (10-A1) (30-A)
(30-K) (30-D)
PS
PS b1 b2 b3
LS2 M b'1 B1 A1 b'2 B2 A2 b'3 B3 A3 b'4 b4 B4 A4 b'5 b5 B5 A5 b6 B6 A6 b7 B7 A7 b9 B9 A9 b11 B11 A11
P1
P3
LS1
TRAVEL TRAVEL BOOM ARM BUCKET DOZER BOOM AUX.1 SWING
RH LH SWING

T1

T B A T T B A T T B A T T B T B A T T B A T
Y1 T3
a1 a2 a'2 a3 a'3 a4 a'4 a5 a6 a7 a9 a11
a'1 a'5
(9-4) (9-2) (30-J) (30-L) (30-E) (30-F) (8-1) (10-A2) (30-B)

T7 T6 T5 T4 T3 T2 T1
2 EPPR (2-b9) (2-a9) BOOM SWING TRAVEL
(Tank-T3)
VALVE A1 A2
L/H R/H
A
LH RH FW BW FW BW
P4 P3 P2 P1 BLOCK(A)
P
SOL VALVE MAIN PUMP X P T
T
A
BLOCK(B) DOZER
LS V/V Grab Grab T 3
FLOATING
Release Clamp 1 P T 2 2 P 1 4
R1 C2 C3 C4 C5 SOLENOID
C1 & (2-a2) (2-b2) (2-a1) (2-b1)
P T Breaker
R2 (2-a7) (2-b7) VALVE
R3 PC V/V D2
D1 D3 D4 D5

(Tank-T1)
B1 G

SWING ARM BOOM BUCKET DOZER

(Tank-T4)
R2 R1 RH LH IN OUT UP DOWN IN OUT DOWN UP
T1 (32-D5) PILOT
T2 (11-T) T
T3 (31-T7) FILTER
T4 (34-T) P1 P2 In Out A1 ACC A2
T5 B2
(3-V)
G TRAVEL
SAFETY
E RELIEF SPEED 3 P 1 4 T 2 2 P 4 3 T 1 1 P T 2
VAVLE
P2
S1 P1
HYDRAULIC S L2 L1 L
T
TANK B C A L K H J E D G F
SOLENOID (2-a6)
(Tank-T2) (2-a4) (2-b3) (2-a5) (2-b6)
VALVE ASSY (2-a11) (2-b11) (2-b4) (2-a3) (2-b5)

TERMINAL

85A3HC31

When the swing and boom functions are operated, simultaneously the swing spool and boom spool
in the main control valve are moved to the functional position by the pilot oil pressure from the
remote control valve.
The oil from the main pump flows into the boom cylinder through boom spool and flows into the
swing motor through the swing spool via the parallel passage.
The superstructure swings and the boom is operated.

3-25
 3. COMBINED SWING AND ARM OPERATION
DOZER
CYLINDER
TRAVEL MOTOR(LH) TRAVEL MOTOR(RH)
SWING MOTOR DR V RED RED
(Tank-T5)
P3
RED P2 P3 P2
D2
D1 D2
D1
G.P2 D C G.P1
P P

B Pi A

Dr E A B C D F H G TURNING JOINT

PP PB A T B
(CCW) (CW)
P1 P1 P4
P4
A B B A
(BW) (FW) (BW) (FW)

BOOM CYLINDER BOOM SWING <2-Way> <Breaker>

ARM CYLINDER BUCKET CYLINDER
CYLINDER
<Quick connectors>
or (Option)
RH

LH
2

MAIN CONTROL VALVE (9-3) (9-1)

(30-H) (30-G)
(8-2) (10-A1) (30-A)
(30-K) (30-D)
PS
PS b1 b2 b3
LS2 M b'1 B1 A1 b'2 B2 A2 b'3 B3 A3 b'4 b4 B4 A4 b'5 b5 B5 A5 b6 B6 A6 b7 B7 A7 b9 B9 A9 b11 B11 A11
P1
P3
LS1
TRAVEL TRAVEL BOOM ARM BUCKET DOZER BOOM AUX.1 SWING
RH LH SWING

T1

T B A T T B A T T B A T T B T B A T T B A T
Y1 T3
a1 a2 a'2 a3 a'3 a4 a'4 a5 a6 a7 a9 a11
a'1 a'5
(9-4) (9-2) (30-J) (30-L) (30-E) (30-F) (8-1) (10-A2) (30-B)

T7 T6 T5 T4 T3 T2 T1
2 EPPR (2-b9) (2-a9) BOOM SWING TRAVEL
(Tank-T3)
VALVE A1 A2
L/H R/H
A
LH RH FW BW FW BW
P4 P3 P2 P1 BLOCK(A)
P
SOL VALVE MAIN PUMP X P T
T
A
BLOCK(B) DOZER
LS V/V Grab Grab T 3
FLOATING
Release Clamp 1 P T 2 2 P 1 4
R1 C2 C3 C4 C5 SOLENOID
C1 & (2-a2) (2-b2) (2-a1) (2-b1)
P T Breaker
R2 (2-a7) (2-b7) VALVE
R3 PC V/V D2
D1 D3 D4 D5

(Tank-T1)
B1 G

SWING ARM BOOM BUCKET DOZER

(Tank-T4)
R2 R1 RH LH IN OUT UP DOWN IN OUT DOWN UP
T1 (32-D5) PILOT
T2 (11-T) T
T3 (31-T7) FILTER
T4 (34-T) P1 P2 In Out A1 ACC A2
T5 B2
(3-V)
G TRAVEL
SAFETY
E RELIEF SPEED 3 P 1 4 T 2 2 P 4 3 T 1 1 P T 2
VAVLE
P2
S1 P1
HYDRAULIC S L2 L1 L
T
TANK B C A L K H J E D G F
SOLENOID (2-a6)
(Tank-T2) (2-a4) (2-b3) (2-a5) (2-b6)
VALVE ASSY (2-a11) (2-b11) (2-b4) (2-a3) (2-b5)

TERMINAL

85A3HC32

When the swing and arm functions are operated, simultaneously the swing spool and arm spool in
the main control valve are moved to the functional position by the pilot oil pressure from the remote
control valve.
The oil from the main pump flows into the swing motor through swing spool via the parallel passage
and flows into the arm cylinder through the arm spool.
The superstructure swings and the arm is operated.

3-26
 4. COMBINED SWING AND BUCKET OPERATION
DOZER
CYLINDER
TRAVEL MOTOR(LH) TRAVEL MOTOR(RH)
SWING MOTOR DR V RED RED
(Tank-T5)
P3
RED P2 P3 P2
D2
D1 D2
D1
G.P2 D C G.P1
P P

B Pi A

Dr E A B C D F H G TURNING JOINT

PP PB A T B
(CCW) (CW)
P1 P1 P4
P4
A B B A
(BW) (FW) (BW) (FW)

BOOM CYLINDER BOOM SWING <2-Way> <Breaker>

ARM CYLINDER BUCKET CYLINDER
CYLINDER
<Quick connectors>
or (Option)
RH

LH
2

MAIN CONTROL VALVE (9-3) (9-1)

(30-H) (30-G)
(8-2) (10-A1) (30-A)
(30-K) (30-D)
PS
PS b1 b2 b3
LS2 M b'1 B1 A1 b'2 B2 A2 b'3 B3 A3 b'4 b4 B4 A4 b'5 b5 B5 A5 b6 B6 A6 b7 B7 A7 b9 B9 A9 b11 B11 A11
P1
P3
LS1
TRAVEL TRAVEL BOOM ARM BUCKET DOZER BOOM AUX.1 SWING
RH LH SWING

T1

T B A T T B A T T B A T T B T B A T T B A T
Y1 T3
a1 a2 a'2 a3 a'3 a4 a'4 a5 a6 a7 a9 a11
a'1 a'5
(9-4) (9-2) (30-J) (30-L) (30-E) (30-F) (8-1) (10-A2) (30-B)

T7 T6 T5 T4 T3 T2 T1
2 EPPR (2-b9) (2-a9) BOOM SWING TRAVEL
(Tank-T3)
VALVE A1 A2
L/H R/H
A
LH RH FW BW FW BW
P4 P3 P2 P1 BLOCK(A)
P
SOL VALVE MAIN PUMP X P T
T
A
BLOCK(B) DOZER
LS V/V Grab Grab T 3
FLOATING
Release Clamp 1 P T 2 2 P 1 4
R1 C2 C3 C4 C5 SOLENOID
C1 & (2-a2) (2-b2) (2-a1) (2-b1)
P T Breaker
R2 (2-a7) (2-b7) VALVE
R3 PC V/V D2
D1 D3 D4 D5

(Tank-T1)
B1 G

SWING ARM BOOM BUCKET DOZER

(Tank-T4)
R2 R1 RH LH IN OUT UP DOWN IN OUT DOWN UP
T1 (32-D5) PILOT
T2 (11-T) T
T3 (31-T7) FILTER
T4 (34-T) P1 P2 In Out A1 ACC A2
T5 B2
(3-V)
G TRAVEL
SAFETY
E RELIEF SPEED 3 P 1 4 T 2 2 P 4 3 T 1 1 P T 2
VAVLE
P2
S1 P1
HYDRAULIC S L2 L1 L
T
TANK B C A L K H J E D G F
SOLENOID (2-a6)
(Tank-T2) (2-a4) (2-b3) (2-a5) (2-b6)
VALVE ASSY (2-a11) (2-b11) (2-b4) (2-a3) (2-b5)

TERMINAL

85A3HC33

When the swing and bucket functions are operated, simultaneously the swing spool and bucket
spool in the main control valve are moved to the functional position by the pilot oil pressure from the
remote control valve.
The oil from the main pump flows into the swing motor through the swing spool via the parallel
passage and flows into the bucket cylinder through the bucket spool.
The superstructure swings and the bucket is operated.

3-27
5. COMBINED SWING, BOOM, ARM AND BUCKET OPERATION
DOZER
CYLINDER
TRAVEL MOTOR(LH) TRAVEL MOTOR(RH)
SWING MOTOR DR V RED RED
(Tank-T5)
P3
RED P2 P3 P2
D2
D1 D2
D1
G.P2 D C G.P1
P P

B Pi A

Dr E A B C D F H G TURNING JOINT

PP PB A T B
(CCW) (CW)
P1 P1 P4
P4
A B B A
(BW) (FW) (BW) (FW)

BOOM CYLINDER BOOM SWING <2-Way> <Breaker>

ARM CYLINDER BUCKET CYLINDER
CYLINDER
<Quick connectors>
or (Option)
RH

LH
2

MAIN CONTROL VALVE (9-3) (9-1)

(30-H) (30-G)
(8-2) (10-A1) (30-A)
(30-K) (30-D)
PS
PS b1 b2 b3
LS2 M b'1 B1 A1 b'2 B2 A2 b'3 B3 A3 b'4 b4 B4 A4 b'5 b5 B5 A5 b6 B6 A6 b7 B7 A7 b9 B9 A9 b11 B11 A11
P1
P3
LS1
TRAVEL TRAVEL BOOM ARM BUCKET DOZER BOOM AUX.1 SWING
RH LH SWING

T1

T B A T T B A T T B A T T B T B A T T B A T
Y1 T3
a1 a2 a'2 a3 a'3 a4 a'4 a5 a6 a7 a9 a11
a'1 a'5
(9-4) (9-2) (30-J) (30-L) (30-E) (30-F) (8-1) (10-A2) (30-B)

T7 T6 T5 T4 T3 T2 T1
2 EPPR (2-b9) (2-a9) BOOM SWING TRAVEL
(Tank-T3)
VALVE A1 A2
L/H R/H
A
LH RH FW BW FW BW
P4 P3 P2 P1 BLOCK(A)
P
SOL VALVE MAIN PUMP X P T
T
A
BLOCK(B) DOZER
LS V/V Grab Grab T 3
FLOATING
Release Clamp 1 P T 2 2 P 1 4
R1 C2 C3 C4 C5 SOLENOID
C1 & (2-a2) (2-b2) (2-a1) (2-b1)
P T Breaker
R2 (2-a7) (2-b7) VALVE
R3 PC V/V D2
D1 D3 D4 D5

(Tank-T1)
B1 G

SWING ARM BOOM BUCKET DOZER

(Tank-T4)
R2 R1 RH LH IN OUT UP DOWN IN OUT DOWN UP
T1 (32-D5) PILOT
T2 (11-T) T
T3 (31-T7) FILTER
T4 (34-T) P1 P2 In Out A1 ACC A2
T5 B2
(3-V)
G TRAVEL
SAFETY
E RELIEF SPEED 3 P 1 4 T 2 2 P 4 3 T 1 1 P T 2
VAVLE
P2
S1 P1
HYDRAULIC S L2 L1 L
T
TANK B C A L K H J E D G F
SOLENOID (2-a6)
(Tank-T2) (2-a4) (2-b3) (2-a5) (2-b6)
VALVE ASSY (2-a11) (2-b11) (2-b4) (2-a3) (2-b5)

TERMINAL

85A3HC34

When the swing, boom, arm and bucket functions are operated, simultaneously each spool in the
main control valve is moved to the functional position by the pilot oil pressure from the remote
control valve.
The oil from the main pump flows into the boom cylinder, arm cylinder and bucket cylinder through
the boom spool, arm spool, bucket spool by the parallel passage.
Also, the oil flows into the swing motor through the swing spool via the parallel passage.
The superstructure swings and the boom, arm and bucket are operated.

3-28
 6. COMBINED SWING AND TRAVEL OPERATION
DOZER
CYLINDER
TRAVEL MOTOR(LH) TRAVEL MOTOR(RH)
SWING MOTOR DR V RED RED
(Tank-T5)
P3
RED P2 P3 P2
D2
D1 D2
D1
G.P2 D C G.P1
P P

B Pi A

Dr E A B C D F H G TURNING JOINT

PP PB A T B
(CCW) (CW)
P1 P1 P4
P4
A B B A
(BW) (FW) (BW) (FW)

BOOM CYLINDER BOOM SWING <2-Way> <Breaker>

ARM CYLINDER BUCKET CYLINDER
CYLINDER
<Quick connectors>
or (Option)
RH

LH
2

MAIN CONTROL VALVE (9-3) (9-1)

(30-H) (30-G)
(8-2) (10-A1) (30-A)
(30-K) (30-D)
PS
PS b1 b2 b3
LS2 M b'1 B1 A1 b'2 B2 A2 b'3 B3 A3 b'4 b4 B4 A4 b'5 b5 B5 A5 b6 B6 A6 b7 B7 A7 b9 B9 A9 b11 B11 A11
P1
P3
LS1
TRAVEL TRAVEL BOOM ARM BUCKET DOZER BOOM AUX.1 SWING
RH LH SWING

T1

T B A T T B A T T B A T T B T B A T T B A T
Y1 T3
a1 a2 a'2 a3 a'3 a4 a'4 a5 a6 a7 a9 a11
a'1 a'5
(9-4) (9-2) (30-J) (30-L) (30-E) (30-F) (8-1) (10-A2) (30-B)

T7 T6 T5 T4 T3 T2 T1
2 EPPR (2-b9) (2-a9) BOOM SWING TRAVEL
(Tank-T3)
VALVE A1 A2
L/H R/H
A
LH RH FW BW FW BW
P4 P3 P2 P1 BLOCK(A)
P
SOL VALVE MAIN PUMP X P T
T
A
BLOCK(B) DOZER
LS V/V Grab Grab T 3
FLOATING
Release Clamp 1 P T 2 2 P 1 4
R1 C2 C3 C4 C5 SOLENOID
C1 & (2-a2) (2-b2) (2-a1) (2-b1)
P T Breaker
R2 (2-a7) (2-b7) VALVE
R3 PC V/V D2
D1 D3 D4 D5

(Tank-T1)
B1 G

SWING ARM BOOM BUCKET DOZER

(Tank-T4)
R2 R1 RH LH IN OUT UP DOWN IN OUT DOWN UP
T1 (32-D5) PILOT
T2 (11-T) T
T3 (31-T7) FILTER
T4 (34-T) P1 P2 In Out A1 ACC A2
T5 B2
(3-V)
G TRAVEL
SAFETY
E RELIEF SPEED 3 P 1 4 T 2 2 P 4 3 T 1 1 P T 2
VAVLE
P2
S1 P1
HYDRAULIC S L2 L1 L
T
TANK B C A L K H J E D G F
SOLENOID (2-a6)
(Tank-T2) (2-a4) (2-b3) (2-a5) (2-b6)
VALVE ASSY (2-a11) (2-b11) (2-b4) (2-a3) (2-b5)

TERMINAL

85A3HC35

When the swing and travel functions are operated, simultaneously the swing spool and travel spools
in the main control valve are moved to the functional position by the pilot oil pressure from the
remote control valve.
The oil from the main pump flows into the swing motor and LH and RH travel motors through the
swing spool and both travel spools via the parallel passage.
The superstructure swings and the machine travels straight.

3-29
 7. COMBINED BOOM AND TRAVEL OPERATION
DOZER
CYLINDER
TRAVEL MOTOR(LH) TRAVEL MOTOR(RH)
SWING MOTOR DR V RED RED
(Tank-T5)
P3
RED P2 P3 P2
D2
D1 D2
D1
G.P2 D C G.P1
P P

B Pi A

Dr E A B C D F H G TURNING JOINT

PP PB A T B
(CCW) (CW)
P1 P1 P4
P4
A B B A
(BW) (FW) (BW) (FW)

BOOM CYLINDER BOOM SWING <2-Way> <Breaker>

ARM CYLINDER BUCKET CYLINDER
CYLINDER
<Quick connectors>
or (Option)
RH

LH
2

MAIN CONTROL VALVE (9-3) (9-1)

(30-H) (30-G)
(8-2) (10-A1) (30-A)
(30-K) (30-D)
PS
PS b1 b2 b3
LS2 M b'1 B1 A1 b'2 B2 A2 b'3 B3 A3 b'4 b4 B4 A4 b'5 b5 B5 A5 b6 B6 A6 b7 B7 A7 b9 B9 A9 b11 B11 A11
P1
P3
LS1
TRAVEL TRAVEL BOOM ARM BUCKET DOZER BOOM AUX.1 SWING
RH LH SWING

T1

T B A T T B A T T B A T T B T B A T T B A T
Y1 T3
a1 a2 a'2 a3 a'3 a4 a'4 a5 a6 a7 a9 a11
a'1 a'5
(9-4) (9-2) (30-J) (30-L) (30-E) (30-F) (8-1) (10-A2) (30-B)

T7 T6 T5 T4 T3 T2 T1
2 EPPR (2-b9) (2-a9) BOOM SWING TRAVEL
(Tank-T3)
VALVE A1 A2
L/H R/H
A
LH RH FW BW FW BW
P4 P3 P2 P1 BLOCK(A)
P
SOL VALVE MAIN PUMP X P T
T
A
BLOCK(B) DOZER
LS V/V Grab Grab T 3
FLOATING
Release Clamp 1 P T 2 2 P 1 4
R1 C2 C3 C4 C5 SOLENOID
C1 & (2-a2) (2-b2) (2-a1) (2-b1)
P T Breaker
R2 (2-a7) (2-b7) VALVE
R3 PC V/V D2
D1 D3 D4 D5

(Tank-T1)
B1 G

SWING ARM BOOM BUCKET DOZER

(Tank-T4)
R2 R1 RH LH IN OUT UP DOWN IN OUT DOWN UP
T1 (32-D5) PILOT
T2 (11-T) T
T3 (31-T7) FILTER
T4 (34-T) P1 P2 In Out A1 ACC A2
T5 B2
(3-V)
G TRAVEL
SAFETY
E RELIEF SPEED 3 P 1 4 T 2 2 P 4 3 T 1 1 P T 2
VAVLE
P2
S1 P1
HYDRAULIC S L2 L1 L
T
TANK B C A L K H J E D G F
SOLENOID (2-a6)
(Tank-T2) (2-a4) (2-b3) (2-a5) (2-b6)
VALVE ASSY (2-a11) (2-b11) (2-b4) (2-a3)

TERMINAL

85A3HC36

When the boom and travel functions are operated, simultaneously the boom spool and travel spools
in the main control valve are moved to the functional position by the pilot oil pressure from the
remote control valve.
The oil from the main pump flows into the boom cylinder and the travel motors through boom, travel
LH and travel RH spools via the parallel passage.
The boom is operated and the machine travels straight.

3-30
 8. COMBINED ARM AND TRAVEL OPERATION

T/MOTOR LH T/MOTOR RH
RED RED BOOM
T1 T2
DOZER BUCKET BOOM ARM SWING
CYLINDER (2-WAY) CYLINDER BREAKER
CYLINDER CYLINDER CYLINDER SWING MOTOR

Ps Ps sh
pg Dr
QUICK
COUPLER

(FW)P1 P2(BW) (FW)P2 P1(BW) B(CW) Mu A(CCW)

Dr E A B C D F G A B

Dr(Swing motor) P T

b6 b5

A10 B10 xb9 A9 B9 A8 B8 P1 P2 B7 A7 B6 A6 B5 A5 B4 A4 P3 AW BW A2 B2 A1 B1

b11 b10 Dr b9 Sb bW b2 b1
b4

T2

PS
AI

Pp

a11 a10 a6 a5 a4 Sa T1 aW a2 a1

b8 a8 a7 b7

a9 Gauge Dr

Pp(MCV)
STRAIGHT TRAVEL SPOOL
BOOM
TRAVEL (2-WAY) SWING D/BLADE SWING ARM BOOM BUCKET
RH LH IN OUT UP DOWN OUT IN
3 1 4 2 2 4 1 3

MCV b5
2 P T 14 3 1 P T 2 1 P T 2 1 P T 2 R1 A1 A2 A3 A4
ACC (b8) (b4)
(a7) (b7) (a8) (a4) (bw) (aw) (a2) (b2)
A1 A2 A3 30K
SAFETY TRAVEL
SPEED BREAKER

I HA B D E F G
b1 a1 b6 a6 a9 b9 a10 b10
P1
b11 a11 xb9

T
S1

85A3HC37

When the arm and travel functions are operated, simultaneously the arm spool and travel spools in
the main control valve are moved to the functional position by the pilot oil pressure from the remote
control valve.
The oil from the main pump flows into the travel motors and the arm cylinder through travel spools
and arm spools via the parallel passage.
The arm is operated and the machine travels straight.

3-31
 9. COMBINED BUCKET AND TRAVEL OPERATION
DOZER
CYLINDER
TRAVEL MOTOR(LH) TRAVEL MOTOR(RH)
SWING MOTOR DR V RED RED
(Tank-T5)
P3
RED P2 P3 P2
D2
D1 D2
D1
G.P2 D C G.P1
P P

B Pi A

Dr E A B C D F H G TURNING JOINT

PP PB A T B
(CCW) (CW)
P1 P1 P4
P4
A B B A
(BW) (FW) (BW) (FW)

BOOM CYLINDER BOOM SWING <2-Way> <Breaker>

ARM CYLINDER BUCKET CYLINDER
CYLINDER
<Quick connectors>
or (Option)
RH

LH
2

MAIN CONTROL VALVE (9-3) (9-1)

(30-H) (30-G)
(8-2) (10-A1) (30-A)
(30-K) (30-D)
PS
PS b1 b2 b3
LS2 M b'1 B1 A1 b'2 B2 A2 b'3 B3 A3 b'4 b4 B4 A4 b'5 b5B5 A5 b6 B6 A6 b7 B7 A7 b9 B9 A9 b11 B11 A11
P1
P3
LS1
TRAVEL TRAVEL BOOM ARM BUCKET DOZER BOOM AUX.1 SWING
RH LH SWING

T1

T B A T T B A T T B A T T B T B A T T B A T
Y1 T3
a1 a2 a'2 a3 a'3 a4 a'4 a5 a6 a7 a9 a11
a'1 a'5
(9-4) (9-2) (30-J) (30-L) (30-E) (30-F) (8-1) (10-A2) (30-B)

T7 T6 T5 T4 T3 T2 T1
2 EPPR (2-b9) (2-a9) BOOM SWING TRAVEL
(Tank-T3)
VALVE A1 A2
L/H R/H
A
LH RH FW BW FW BW
P4 P3 P2 P1 BLOCK(A)
P
SOL VALVE MAIN PUMP X P T
T
A
BLOCK(B) DOZER
LS V/V Grab Grab T 3
FLOATING
Release Clamp 1 P T 2 2 P 1 4
R1 C2 C3 C4 C5 SOLENOID
C1 & (2-a2) (2-b2) (2-a1) (2-b1)
P T Breaker
R2 (2-a7) (2-b7) VALVE
R3 PC V/V D2
D1 D3 D4 D5

(Tank-T1)
B1 G

SWING ARM BOOM BUCKET DOZER

(Tank-T4)
R2 R1 RH LH IN OUT UP DOWN IN OUT DOWN UP
T1 (32-D5) PILOT
T2 (11-T) T
T3 (31-T7) FILTER
T4 (34-T) P1 P2 In Out A1 ACC A2
T5 B2
(3-V)
G TRAVEL
SAFETY
E RELIEF SPEED 3 P 1 4 T 2 2 P 4 3 T 1 1 P T 2
VAVLE
P2
S1 P1
HYDRAULIC S L2 L1 L
T
TANK B C A L K H J E D G F
SOLENOID (2-a6)
(Tank-T2) (2-a4) (2-b3) (2-a5) (2-b6)
VALVE ASSY (2-a11) (2-b11) (2-b4) (2-a3) (2-b5)

TERMINAL

85A3HC38

When the bucket and travel functions are operated, simultaneously the bucket spool and travel
spools in the main control valve are moved to the functional position by the pilot oil pressure from the
remote control valve. The oil from the main pump flows into the travel motors and the bucket
cylinder through the travel spools and the bucket spool via the parallel passage.
The bucket is operated and the machine travels straight.

3-32
 SECTION 4 ELECTRICAL SYSTEM

Group 1 Component Location -------------------------------------------------------------------------------------- 4-1

Group 2 Monitoring system ------------------------------------------------------------------------------------------ 4-3
Group 3 Electrical Circuit ---------------------------------------------------------------------------------------------- 4-42
Group 4 Electrical Component Specification -------------------------------------------------------------- 4-59
Group 5 Connectors ------------------------------------------------------------------------------------------------------ 4-66
Group 6 Fault codes ------------------------------------------------------------------------------------------------------ 4-83
 SECTION 4 ELECTRICAL SYSTEM
GROUP 1 COMPONENT LOCATION

1. LOCATION 1

10
1 11
2 12
3 13
4
5
6
7 Switch
C
A
B

panel

Membrane 14
switch

8
9

15
16
17

18

85A4EL20

1 Head light switch 7 Start switch 13 DPF switch

2 Work light switch 8 Breaker operation switch (opt) 14 Master switch
3 Travel alarm switch 9 Accel dial switch 15 Pattern change switch
4 Cab light switch 10 Wiper switch 16 AUX switch
5 Beacon switch 11 Washer switch 17 Horn switch
6 Breaker selection switch (opt) 12 Overload switch (opt) 18 Quick clamp switch

4-1
2. LOCATION 2

SUPPORT ASSY
(6210)

85A4EL03

1 Engine control unit 4 Cover

2 Driving alarm buzzer 5 Washer tank assy
3 Horn 6 Rear view camera assy

4-2
GROUP 2 MONITORING SYSTEM

1. OUTLINE
Monitoring system consists of the monitor part and switch part.
The monitor part gives warnings when any abnormality occurs in the machine and informs the
condition of the machine.
Various select switches are built into the monitor panel, which act as the control portion of the
machine control system.

2. CLUSTER
1) STRUCTURE
The cluster consists of LCD and switches as shown below. The LCD is to warn the operator in case
of abnormal machine operation or conditions for the appropriate operation and inspection.
Also, The LCD is to set and display for modes, monitoring and utilities with the switches.
The switches or touch screen are to set the machine operation modes.
※ The cluster installed on this machine does not entirely guarantee the condition of the machine.
Daily inspection should be performed according to chapter 6, Maintenance.
※ When the cluster provides a warning immediately check the problem, and perform the required
action.

Warning lamps Time display

(See page 4-6)

Pilot lamps
(See page 4-12)

Gauge(See page 4-4)

Main menu(See page 4-18)

Pilot lamps
(See page 4-11)

Switches
(See page 4-13)

85A4EL21

※ The warning lamp pops up, lights ON (on the left-top side) and the buzzer sounds when the
machine has a problem.
The warning lamp lights ON until the problem is cleared. Refer to page 4-6 for details.

4-3
2) GAUGE
(1) Operation screen
When you first turn starting switch ON, the operation screen will appear.

Default (A type) Option (B type) Option (C type)

2
2 6
2
6
3

1 5 4 6 1 5 3 4 1 5 4 3
85A3CD159A HX603CD07B HX603CD07C

1 Engine coolant temp gauge 3 Fuel level gauge 5 Accel dial

2 Hydraulic oil temp gauge 4 Engine rpm 6 Clinometer

※ Operation screen type can be set by the screen type menu of the display.
Refer to page 3-20 for details.

(2) Engine coolant temperature gauge

Engine coolant temp gauge ① This gauge indicates the temperature of coolant.
·Black range : 43˚C (104˚F) or more and below 110 ˚C
(239˚ F)
·Red range : Above 110˚C (239˚F) or more
② If the indicator is in the red range or lamp lights ON in red,
turn OFF the engine and check the engine cooling system.
※ If the gauge indicates the red range or lamp lights ON in
Accel dial gauge
red even though the machine is on the normal condition, check
85A3CD101
the electric device as that can be caused by the poor
connection of electricity or sensor.
③ Accel dial gauge
Displays the levels (0~9) of the accel dial.

(3) Hydraulic oil temperature gauge

Hydraulic oil temp gauge ① This gauge indicates the temperature of hydraulic oil.
·Black range : 40-105˚C (104-221˚F)
·Red range : Above 105˚C (221˚F)
② If the indicator is in the red range or lamp lights ON in red,
reduce the load on the system. If the gauge stays in the red
range, stop the machine and check the cause of the problem.
※ If the gauge indicates the red range or lamp lights ON in
red even though the machine is on the normal condition, check
Clinometer
85A3CD102
the electric device as that can be caused by the poor
connection of electricity or sensor.
③ Clinometer
Displays the gradient information of the machine.

4-4
(4) Fuel level gauge
① This gauge indicates the amount of fuel in the fuel tank.
② Fill the fuel when the red range, or lamp lights ON in red.
※ If the gauge indicates the red range or lamp lights ON in
red even though the machine is on the normal condition, check
the electric device as that can be caused by the poor
connection of electricity or sensor.
Fuel level gauge
85A3CD103

(5) Engine rpm display

① This displays the engine revolutions per minute.

HX603CD35

3) COMMUNICATION ERROR AND LOW VOLTAGE WARNING POP-UP

(1) Communication error pop-up
① Cluster displays this communication error pop-up when it has
communication error with MCU.
② Communication error pop-up displays at operation screen only.
Just buzzer alarm at the other screen.
③ If communication with MCU become normal state, it will
disappear automatically.
HX603CD30

(2) Low voltage warning pop-up

① Cluster displays this low voltage warning pop-up when the
battery voltage is low.
② Low voltage warning pop-up displays at operation screen only.
Just buzzer alarm at the other screen.
③ This pop-up will disappear with using touch screen or buzzer
stop switch. While the battery voltage is low, buzzer sounds
HX603CD31
every minute.
④ When the battery voltage is higher than 11.5 V, the pop-up off.

4-5
4) WARNING LAMPS

Engine coolant temp warning lamp Fuel level warning lamp

Hydraulic oil temp warning lamp Emergency warning lamp
Engine oil pressure warning lamp Battery charging warning lamp
DPF warning lamp Check engine warning lamp
Water in fuel warning lamp Air cleaner warning lamp
Emission system fail warning lamp Overload warning lamp

Engine stop warning lamp

Seat belt reminder warning lamp

85A3CD104

※ Each warning lamp on the left-top of the LCD pops up on the center of LCD and the buzzer
sounds when the each warning is happened. The pop-up warning lamp moves to the original
position and lights ON when the buzzer stop switch is pushed or the pop-up is touched. And the
buzzer stops. Refer to page 3-12 for the switch.
※ When the warning lamps light ON more than 6, you can check all lamps with next page button
( , ) near the warning lamps.

(1) Engine coolant temperature warning lamp

① The lamp pops up on the center of LCD and the buzzer
sounds when the engine coolant temperature is over 110˚C or
more.
② The pop-up lamp moves to the original position and lights ON
when the buzzer stop switch is pushed or pop-up is touched.
290F3CD61
Also, the buzzer stops and lamp keeps ON.
③ Check the cooling system when the lamp keeps ON.

(2) Hydraulic oil temperature warning lamp

① The lamp pops up on the center of LCD and the buzzer
sounds when the hydraulic oil temperature is over 105˚C or more.
② The pop-up lamp moves to the original position and lights ON
when the buzzer stop switch is pushed or pop-up is touched.
Also, the buzzer stops and lamp keeps ON.
290F3CD62
③ Check the hydraulic oil level and hydraulic oil cooling system.

4-6
(3) Fuel level warning lamp
① This warning lamp lights ON and the buzzer sounds when the
level of fuel is below 9%.
② Fill the fuel immediately when the lamp is ON.

290F3CD63

(4) Emergency warning lamp

① This lamp pops up and the buzzer sounds when each of the
below warnings are happened.
- MCU input voltage abnormal
- Accel dial circuit abnormal or open
※ The pop-up warning lamp moves to the original position and
290F3CD64
lights ON when the buzzer stop switch is pushed or pop-up is
touched. Also the buzzer stops.
This is same as following warning lamps.
② When this warning lamp lights ON, machine must be checked
and serviced immediately.

(5) Engine oil pressure warning lamp

① This lamp lights ON when the engine oil pressure is low.
② If the lamp lights ON, shut OFF the engine immediately. Check
oil level.

290F3CD65

(6) Check engine warning lamp

① This lamp lights ON when the communication between
MCU and engine ECM on the engine is abnormal, or if the
cluster received any fault code from engine ECM.
② Check the communication line between them.
If the communication line is OK, then check the fault codes on
290F3CD66
the cluster.
③ Also, this lamp pops up when the level of DPF soot is high.
※ Refer to the page 3-7 for the DPF warning lamp.

(7) Battery charging warning lamp

① This lamp lights ON when the battery charging voltage is low.
② Check the battery charging circuit when this lamp is ON.

290F3CD67

4-7
 (8) Air cleaner warning lamp
① This lamp lights ON when the filter of air cleaner is clogged.
② Check the filter and clean or replace it.

290F3CD68

(9) Overload warning lamp (opt)

① When the machine is overload, the overload warning lamp
lights ON during the overload switch is ON. (if equipped)
② Reduce the machine load.
Initiate a manual regeneration

HX603CD80

(10) DPF (diesel particulate filter) warning lamp

① This warning lamp lights ON or blinks when the regeneration is
needed as table below.
※ Consequences of delaying regeneration
- Poor performance caused by increasing exhaust gas
pressure.
290F3CD70
- Higher fuel consumption
- Shorter filter lifetime

Warning lamp
DPF Check engine Stop engine
Condition Remedy

(pop up) (pop up)

Normal Off Off Off · Automatic regeneration

· Push DPF switch to OFF position if DPF switch
Soot low On Off Off is in inhibit position. (see 3-39 page)
· Engine power may be reduced automatically
(soot medium)
Soot midium Blink Off Off

· Engine power and speed will be reduced

Soot high On On Off automatically
· Initiate a manual regeneration
· Stop the engine immediatary.
Stop On Off On · Please contact your Hyundai service center or
local dealer.

4-8
※ Manual regeneration method of DPF

Safety button
※ Manual regeneration applies if the machine is in a fireproof
1
area.
2
① Stop and park the machine.
② The accel dial to the lowerest position and operate the engine
in idling.
③ Pull the safety button and push the switch to position ② to
initiate the manual regeneration of DPF.
※ Refer to the page 3-28 for the switch operation.
※ The engine speed may increase gradually to high idle rpm and
ACK
DPF regeneration begins and it will take approximately 25~30
HEST warning DPF regeneration minutes.
lamp ON ACK lamp ON
④ When the manual regeneration starts, the DPF warning lamp
turns OFF and the regeneration acknowledge lamp and HEST
warning lamp will light ON during the regeneration function is
ACK operating.
HEST warning DPF regeneration ⑤ The regeneration acknowledge lamp and HEST warning lamp
lamp OFF ACK lamp OFF
will light OFF when the regeneration function is completed.
559A3CD143

(11) Stop engine warning lamp

① If the lamp lights ON, stop the engine immediately and check
the engine.
② Check the fault codes on the monitor.
※ Please contact your Hyundai service center or local dealer.

290F3CD252

(12) Water in fuel warning lamp

① This warning lamp lights ON when water is in fuel.
② Check the water separator.

HX60A3CD110

(13) Seat belt reminder warning lamp

① When operator don’t fasten the seat belt, the seat belt
reminder warning lamp pops up and the buzzer sounds.
② Fasten the seat belt.
③ The warning lamp lights ON until fasten the seat belt and the
buzzer sounds for 30 seconds.
290F3CD252

4-9
(14) Emission system fail warning lamp
① This warning lamp indicates there are faults related to the
emission system
② The lamp lights ON when each of the below warnings is
happened.
a. The EGR valve malfunctions
300A3CD15
b. Electrical malfunction of the EGR control sensors
(disconnection, short)
c. Tampering with the EGR control sensors
※ Please contact your Hyundai service center or local dealer.

4-10
 5) PILOT LAMPS

HEST pilot lamp Auto safety lock pilot lamp-manual

DEF regeneration inhibit pilot lamp Auto safety lock pilot lamp-auto
Fuel warmer pilot lamp Preheat pilot lamp
DPF regeneration ACK pilot lamp Maintenance pilot lamp
Boom swing pilot lamp Breaker pilot lamp

Angle dozer pilot lamp

Dozer floating pilot lamp

Smart key pilot lamp Travel speed pilot lamp

Power mode pilot lamp Auto idle mode pilot lamp
Warming up pilot lamp Auto idle status pilot lamp
ECO pilot lamp AUX flowing setting pilot lamp 85A3CD105

※ When the pilot lamps light ON more than 3, you can check all lamps with next page button
( , ).

(1) Mode pilot lamps

No Mode Pilot lamp Selected mode

Heavy duty power work mode

1 Power mode
Standard power mode

Low speed traveling

2 Travel mode
High speed traveling

Auto idle mode

3 Auto idle mode
Auto idle status

(2) Preheat pilot lamp

① Turning the start key switch ON position starts preheating in
cold weather.
② Start the engine after this lamp is OFF.

290F3CD79

4-11
(3) Warming up pilot lamp
① This lamp is turned ON when the coolant temperature is below
30˚C (86˚F ).
② The automatic warming up is cancelled when the engine
coolant temperature is above 30˚C, or when 10 minutes have
passed since starting the engine.
290F3CD80

(4) Auto idle status/ mode pilot lamp

Mode pilot lamp ① The auto idle mode pilot lamp will be ON when the idle mode
is selected.
AUTO
② The auto idle status pilot lamp will be ON when all levers and
n/min pedals are at neutral position, and the auto idle mode is
Status pilot lamp selected.
③ One of the lever or pedal is operated, the status lamp will be
OFF and the engine speed returns to the previous conditions.
n/min
85A3CD106

(5) Maintenance pilot lamp

① This lamp will be ON when the consuming parts are needed to
change or replace. It means that the change or replacement
interval of the consuming parts remains below 30 hours.
② Check the message in maintenance information of main menu.
Also, this lamp lights ON for 3 minutes when the start switch is
85A3CD110
ON position.
※ Refer to the page 3-27.

(6) Boom swing pilot lamp

① This lamp is ON when the boom offset switch is pressed.
※ Refer to the page 3-42.

HX603CD82

( 7 ) DPF regeneration inhibit warning lamp

① This warning lamp indicates, when illuminated, the DPF switch
is pushed inhibit position, therfore automatic and manual
regeneration can not occur.
※ Refer to the page 3-39 for the DPF switch.
85A3CD107

4-12
(8) DPF regeneration acknowledge warning lamp
① This warning lamp will light ON during the regeneration
function is operating.
② Also, this lamp will light OFF when the regeneration function is
ACK completed.
85A3CD108

(9) HEST (High exhaust system temperature) warning lamp

① This warning lamp indicates, when illuminated, that exhaust
temperatures are high due to regeneration of the DPF.
② The lamp will also illuminate during a manual regeneration.
③ When this lamp is illuminated, be sure the exhaust pipe outlet
is not directed at any surface or material that can melt, burn, or
85A3CD109
explode.
When this lamp is illuminated, the exhaust gas temperature
could reach 600˚
600˚C [1112˚
[1112˚F],
], which is hot enough to ignite or
melt common materials, and to burn people.
※ The lamp does not signify the need for any kind of equipment
or engine service; It merely alerts the equipment operator to
high exhaust temperatures. It will be common for the lamp to
illuminate on and off during normal equipment operation as the
engine completes regeneration.

(10) Smart key pilot lamp (opt)

① This lamp will be ON when the engine is started by the start
button.
② This lamp is red when the a authentication fails, green when
succeeds.
※ Refer to the page 3-21.
300A3CD36

(11) ECO pilot lamp

① This lamp will be ON when the ECO switch is pressed.
② The machine will be operated in economy conditions.

85A3CD111

4-13
(12) Dozer floating pilot lamp
① This lamp will be ON when the dozer floating lever is pressed.
※ Refer to the page 3-42.

85A3CD112

(13) Breaker pilot lamp

① This lamp will be ON as conditions below.
- The breaker selection switch is pressed on the membrane
switch.
- The AUX switch is pressed to OFF positions.
※ Refer to the page 3-37 and 3-39.
85A3CD116

(14) Angle dozer pilot lamp (opt)

① This lamp will be ON when the AUX switch is pressed to
ANGLE DOZER positions.
※ Refer to the page 3-39.

85A3CD113

(15) AUX flowing setting pilot lamp

① This lamp will be ON as conditions below.
- The AUX flow setting is selected Enables in the cluster.
- The AUX switch is pressed to AUX positions.
※ Refer to the page 3-32 and 3-39.

85A3CD114

(16) Auto safety lock pilot lamp-manual

① This lamp will be ON when the safety lever is in the lock
positions.
※ Refer to the page 3-42.

85A3CD114

4-14
(17) Auto safety lock pilot lamp-auto
① Auto safety lock system prevents unintended operation of the
machine in order to improve safety.
② Only if safety lever is locked, engine is started.
③ If operator unlock safety lever when RCV lever is pressed,
machine is not controlled by RCV lever.
300A3CD37

300A3CD38

4-15
 6) SWITCHES

Main menu quick

touch switch

Power mode pilot lamp Travel speed pilot lamp

Auto idle mode pilot lamp
Auto idle status pilot lamp
Power mode switch ESC switch

Travel speed control switch Camera switch

Auto idle switch Buzzer stop switch

Select switch
85A3CD117

※ When the switches are selected, the pilot lamps are displayed on the LCD. Refer to the page 3-10
for details.

(1) Power mode switch

① This switch is to select the machine power mode and selected
power mode pilot lamp is displayed on the pilot lamp position.
·P : Heavy duty power work.
·S : Standard power work.
② The pilot lamp changes S → P → S in order.

85A3CD117A

(2) Select switch

① This switch is used to select or change the menu and input
value.
② Knob push
·Long (over 2 sec) : Return to the operation screen
·Medium (0.5~2 sec) : Return to the previous screen
85A3CD117B
·Short (below 0.5 sec) : Select menu
③ Knob rotation
This knob changes menu and input value.
·Right turning : Down direction / Increase input value
·Left turning : Up direction / Decreased input value

4-16
(3) Auto idle/ buzzer stop switch
① This switch is used to activate or cancel the auto idle function.
※ Refer to the page 3-11 for details.
② The buzzer sounds when the machine has a problem.
In this case, push this switch and buzzer stops, but the warning
lamp blinks until the problem is cleared.

85A3CD117C

(4) Buzzer stop switch

① The buzzer sounds when the machine has a problem.
In this case, push this switch and buzzer stops, but the warning
lamp blinks until the problem is cleared.

85A3CD117D

(5) Travel speed control switch

① This switch is used to select the travel speed alternatively.
· : Low speed
· : High speed

85A3CD117E

(6) Escape/ Camera switch

① In the operation screen, pushing this switch will display the
view of the camera on the machine (if equipped).
※ Please refer to page 3-32 for the camera.

85A3CD117F

(7) Escape switch

① This switch is used to return to the previous menu or parent
menu.

85A3CD117G

4-17
7) MAIN MENU
· Operation screen

85A3CD159
Tap
Main menu screen Sub menu screen
or
Press

Press
HX603CD32B

85A3CD118 85A3CD119

HX603CD32C

85A3CD120

※ Please refer to select switch, page 3-15 for selection and change of menu and input value.

4-18
(1) Structure
No Main menu Sub menu Description
Active fault - Machine MCU
Active fault - Engine ECU
Logged fault - Machine MCU
1 Logged fault - Engine ECU
Monitoring (Analog) Machine information
Monitoring Monitoring (Digital) - Input Switch status
55I3CD51A
Monitoring (Digital) - Output Output status
ESL mode setting ESL mode setting, Smart key setting
Automatic engine shutdown One time, Always, Disabled
Change password Password change
AUX flow setting 2 way, 4 way
Option attach Setting option attachment
Management
2 Maintenance information Replacement, Change interval oils and filters
55I3CD51B
Machine Information Cluster, MCU, Engine, Machine
A/S phone number A/S phone number, A/S phone number change
Service menu Delete logged faults, Software download,
Operating hour, power shift
DPF filter replacement, AVCU setting
Clock Clock
Screen type A type, B type, C type
Brightness setting Manual, Auto
3
Unit setting Temperature, Pressure
Display Language 12 language
55I3CD51C Calibration Calibrating the touch screen
Camera setting Number of active, Display order, Camera No.
Mode Operation mode select
4 Video Play music and video file

Utilities
55I3CD51D

4-19
(2) Monitoring
① Active fault - Machine

85A3CD121

85A3CD122

· The active faults of the MCU can be checked by this menu.

② Active fault - Engine

85A3CD123

85A3CD124

· The active faults of engine ECU can be checked by this menu.

③ Logged fault - Machine/ Engine

85A3CD125

559A3CD50A

· The logged faults of the MCU or engine ECU can be checked by this menu.
· Only for the service person.

④ Monitoring (Analog)

85A3CD127

85A3CD128

· The machine status such as the engine rpm, oil temperature, voltage and pressure etc. can
be checked by this menu.

4-20
⑤ Monitoring (Digital) - Input

85A3CD129

85A3CD130

· The switch status can be confirmed by this menu.

· The activated switchs are blue light ON.

⑥ Monitoring (Digital) - Output

85A3CD132

85A3CD133

· The output status can be confirmed by this menu.

· The output pilot lamps are blue light ON.

4-21
 (3) Management
① ESL mode setting

85A3CD134
Delete OK
85A3CD135 85A3CD136

· ESL mode setting

- ESL : Engine Starting Limit
- ESL mode is desingned to be a theft deterrent or will prevent the unauthorized operation of
the machine.
- If the ESL mode was selected Enable, the password will be required when the start switch is
turned ON.
- Disable : Not used ESL function
Enable (always) : The password is required whenever the operator starts engine.
Enable (Interval) : The password is required when the operator starts engine first.
But the operator can restart the engine within the interval time without in-
putting the password.
The interval time can be set maximum 2 days.
※Default
Default password : 00000
※Password
Password length : 5~10 digit
· Smart key (option) : Smart key is registered when equipped with optional smart key. If smart
key is not inside of the cabin, authentication process fails and the pass-
word entering is needed.

4-22
 ② Automatic engine shutdown

85A3CD137

85A3CD138 85A3CD139

85A3CD140

The automatic engine shutdown function can be set by this menu.

a. Once (one time)
· Automatic shutdown function set Once when key-on or engine operation condition.
- Key-off when the shutdown button clicks after pop-up the automatic stop icon.
- Shift automatic shutdown function to Disable when when the cancel button clicks after pop-up
the automatic stop icon.
· Keep Disable for the automatic shutdown function when key-off after key-on again or start en-
gine.
b. Always (continuous use)
· Automatic shutdown function set Always when key-on or engine operation condition.
- Key-off when the shutdown button clicks after pop-up the automatic stop icon.
- Shift automatic shutdown function to Disable when when the cancel button clicks after pop-up
the automatic stop icon.
· Keep Always for the automatic shutdown function when key-off after key-on again or start en-
gine.
c. Disable
· Disable the engine automatic shutdown function.

4-23
③ Change password
- The password is 5~10 digits.

85A3CD141

85A3CD142 85A3CD143

Enter the current password Enter the new password

85A3CD144 85A3CD145

The new password is stored in the MCU. Enter the new password again

④ AUX flow setting

a. Option attach selection

85A3CD146

85A3CD147

a b c
R559A3CD42O

- Three kinds of option attachment can be selected by this menu.

ⓐ Rotary Grapple (Equipped with 4 way option)
ⓑ Grapple (Equipped with 2 or 4 way option)
ⓒ Auger (Equipped with 2 or 4 way option)
※ There are two user modes (type A or B) in each option attach.

4-24
b. Proportional flow control setting
User can set preferable value of each option attachment by this menu.

a) Rotary setting
· Select Rotary
RCV, button and flow
can be set by this menu

HX603CD43O
85A3CD149

· RCV setting
- Enable set LH or RH RCV
for rotary operation.
- Example :
Select LH for rotary ->
85A3CD150
RH set for grapple automatically.

· Button setting (CW rotation)

- Enable set LH or RH button
for CW or CCW rotation.
- Example :
Select LH for CW rotation ->
85A3CD151
RH set for CCW rotation
automatically

· Flow setting
- Enable set from level 1 to level 5.
- Example :
Select level 3.
- Press Yes after flow setting.
85A3CD152

4-25
 b) Grapple setting
· Select grapple
RCV, button and flow
can be set by this menu

HX603CD43O 85A3CD153

· RCV setting
- Enable set LH or RH RCV for
grapple operation.
- Example :
Select RH for grapple ->
85A3CD154
LH set for rotary automatically.

· Button setting (Close)

- Enable set LH or RH button
for close or open.
- Example :
Select RH for Close ->
85A3CD155
LH set for open automatically

· Flow setting
- Enable set from level 1 to level 5.
- Example :
Select level 1.
- Press Yes after flow setting.
85A3CD158 85A3CD156

· Save setting value

- Enable save setting value by
pressing change ( ) button.

HX603CD43O 85A3CD157

· Setting value saved once, it memorized in each icon and the last setting value is activated.
· Saved setting can be used by pressing Icon button only.
· There are two kinds (A and B) in each option attach setting and six kinds of option attach setting
can be saved totally (2 of 4 way, 4 of 2 way).

4-26
c. Confirmation
Previous setting value can be
checked by following procedure.
- Menu > Management > AUX
flow setting
85A3CD159
a) Rotary setting
85A3CD160
- Rotary RCV : LH
- Rotary flow level : 3
- CW rotation : LH
AUX flowing setting pilot lamp ( ) is activated on the - CCW rotation : RH
lower side of the main screen as below conditions. b) Grapple setting
- The AUX switch is pressed to the AUX position and - Grapple RCV : RH
the AUX flow setting is selected Enabled. - Grapple flow level : 3
- Open : LH
- Close : RH

4-27
⑤ Maintenance information

85A3CD161

85A3CD162 85A3CD163

· Elapse : Maintenance elapsed time.

· Interval : The change or replace interval can be changed in the unit of 50 hours.
· History-Hour : Maintenance replacement history.
· Replacement : The elapsed time will be reset to zero (0).
· Change or relpace interval

No Item Interval
1 Engine oil 500
2 Final gear oil 1000
3 Hydraulic oil 5000
4 Hydraulic oil pilot line filter 1000
5 Hydraulic oil return filter 1000
6 Engine oil filter 500
7 Fuel filter 500
9 Pre-filter 500
10 Hydraulic tank air breather 1000
11 Air cleaner 500
12 Radiator coolant 2000

· User cab be set to pop-up the replacement parts that re-

sidual time is less than 50 hours based on the replacement
interval.
- Pop-up the replacement parts list once when start switch
is key-on.
85A3CD166

· Please contact to parts dealer for supplies replacement.

It can be a disadvantage for warranty repair when not to
replace with supplies on time and use genuine parts.

85A3CD167

4-28
⑥ Machine Information

85A3CD164

85A3CD165

· This can confirm the identification of the cluster, MCU, engine and machine.

⑦ S/W down load

85A3CD168

85A3CD169

· Display and update software version about operating system, application, image
and font through this menu.
※ Do not turn off the start switch when update process is proceeding.

⑧ A/S phone number

85A3CD170

85A3CD171 85A3CD172

· The A/S phone number can be checked and changed.

4-29
⑨ Service menu

85A3CD173

Enter the password 85A3CD174 85A3CD175

· Delete logged fault : Logged faults of MCU or engine ECU can be deleted. (only when the
engine is stopped)
· Operating hours : Operating hours since the machine line out can be checked.
· Power shift : Set power shift mode (standard/option)
· RPM & Fuel : The engine rpm or fuel gauge can be display on the center of the cluster op-
eration screen.
· PRM number : The engine rpm number can be display or not on the center of the cluster op-
eration screen.
· DPF filter replacement : Engine ECM parameter can be initialized when the DPF cleaning
process is finished.
· AVCU setting : Selection of the 2 way, 4 way, angle dozer can be set when the machine line
out.

4-30
(4) Display
① Clock

85A3CD176

559A3CD61A

"****-**-**"" represent Year/Month/Day each.

· The first line's three spots "****-**-**
· The second line shows the current time. (AM, PM/0:00~12:59)

② Screen type

85A3CD178

85A3CD179

· The screen type (A,B,C) of the LCD can be selected by this menu.

③ Brightness setting calibration

85A3CD180

85A3CD181
Manual (1st~10th step)

85A3CD182 85A3CD183
Auto (day/night) Auto (time)

· If "Auto" is chosen, brightness for day and night can be differently set up. Also, users can de-
fine which day time interval. (Set day starting time and ending time)

4-31
④ Unit setting

85A3CD184

85A3CD185

· Temperature : ˚C ↔ ˚F
· Pressure : bar ↔ MPa ↔ kgf/cm2 ↔psi

⑤ Language

85A3CD186

85A3CD187

· User can select preferable language and all displays are changed the selected language.

4-32
(5) Utilities
① Camera setting
· Three cameras can be installed on the machine and the display order can be set by this
menu.
· If the camera was not equipped, this menu is not useful.

85A3CD188

85A3CD189

· In the operation screen, if the ESC/CAM switch is pushed, rear view camera display or stop.
· Turnning the select switch in clockwise direction, the next ordered will be shown and in counter-
clockwise direction, the previously ordered will be shown. Also, you can change camera
channel using touch the screen.
· Push the select switch or touch the screen, the displayed screen will be enlargement.

Quick menu
screen

85A3CD190
HX603CD68B

② Mode

85A3CD191

85A3CD192

· When this cluster's buttons are not work, you can control using touch screen instead of
these buttons.
· You can only control in this mode screen.

4-33
③ Video
· Play MP4 or codec file of external hard disk through USB port.
· The USB port is located under the cluster.

85A3CD193

1 2 3 4 5 6 7 8 9 10
85A3CD194

85A3CD118 85A3CD190A
85A3CD194A

· Over 1100 engine rpm, the screen turns into the operation screen with MP4 or codec file
playing for the safety.

No. Function Control No. Function Control

1 Display list Touch 6 After 10 sec Touch

2 Before 10 sec Touch 7 Stop ESC switch or touch

3 Previous track Touch 8 Mute Touch

4 Play/pause Touch 9 Sound volume Select switch or touch

5 Next track Touch 10 Playing time -

4-34
④ Clinometer

85A3CD186

85A3CD196

· When the machine is on the flatland, if tap the "initialization", the values of X, Y, Z reset "0".
· You can confirm tilt of machine in cluster's operating screen.

⑤ Manual

85A3CD197

85A3CD198

· You can read the manual of the cluster on the monitor.

4-35
3. SWITCHES
Wiper switch
Head light switch Washer switch
Work light switch Overload switch(opt)
Travel alarm switch DPF switch
Cab light switch
Beacon switch
Breaker selection switch
Start switch C
A
B Switch
Starting button(opt) panel

Membrane
switch
Master switch
Breaker operation switch
Accel dial switch

Pattern change switch

AUX switch
Horn switch

Quick clamp switch

85A3CD02

1) STARTING SWITCH
(1) There are three positions, OFF, ON and START.
· (OFF) : None of electrical circuits activate.
· (ON) : All the systems of machine operate.
· (START) : Use when starting the engine.
Release key immediately after starting.
※ If you turn ON the starting switch in cold weather, the fuel warmer is
21073CD27
automatically operated to heat the fuel by sensing the coolant
temperature. Start the engine in 1~2 minutes after turning ON the
STARTING BUTTON starting switch. More time may take according to ambient
PUSH temperature.
OFF
ON
※ Key must be in the ON position with engine running maintain
OFF
START electrical and hydraulic function and prevent serious machine
damage.

Starting button with

smart key tag (opt)

4-36
2) ACCEL DIAL
(1) There are 10 dial setting.
Increase (2) Setting 1 is low idle and setting 10 is high idle.
·By rotating the accel dial to right : Engine speed increased.
·By rotating the accel dial to left : Engine speed decreased.

Decrease
235Z93CD46A

3) HEAD LIGHT SWITCH

(1) This switch is used to operate the illumination.
(2) Press the switch once, the head light and illumination lamps come
ON.
·Air conditioner and heater controller
·Radio and USB player
·USB socket, DPF switch, accel dial and cigar lighter
555C93CD80 (3) Press the switch once more, the head light and illumination lamps
turn off.

4) WORK LIGHT SWITCH

(1) This switch is used to operate the work light.
·Press the switch once, the work light comes ON and the pilot lamp
ON.
·Press the switch once more, the work light and pilot lamp turn off.

555C93CD80A

5) TRAVEL ALARM SWITCH

(1) This switch is used to alarm surroundings when the machine travels
to forward and backward.
(2) On pressing this switch, the alarm operates only when the machine
is traveling.

555C93CD83

6) CAB LIGHT SWITCH

(1) This switch turns on the cab light on the cab.
B
A
C

555C93CD83A

4-37
7) BEACON SWITCH (option)
(1) This switch turns ON the rotary light on the cab.
(2) The below indicator lamp is turned ON when operating this switch.

555C93CD30

8) BREAKER SELECTION SWITCH (option)

(1) When this switch is pressed, the breaker will be ready to operation.
※ Refer to the page 3-38 for details.

555C93CD37

9) WIPER SWITCH
(1) This switch is used to operate the wiper.
The wiper operates.
Wiper motor doesn't operate with front sliding door open.
If wiper does not operate with the switch in the ON position, turn the
switch off immediately. Check the cause. If the switch remains ON,
motor failure can result.
555C93CD91

10) WASHER SWITCH

(1) This switch is used to operate the washer.
·The washer liquid is sprayed and the wiper is operated only while
pressing this switch. If release the switch, return to the first position.

555C93CD92

11) QUICK CLAMP SWITCH (option)

(1) This switch is used to engage or disengage the moving hook on
Safety button quick clamp.
※ Refer to the page 8-6 for details.
Lock
Unlock

555C93CD93

4-38
12) OVERLOAD SWITCH (option)
(1) When this switch pressed ON position, buzzer makes sound and
overload warning lamp comes ON in case that the machine is
overload.
(2) When it pressed OFF position, buzzer stops and warning lamp goes
out.
559A3CD39

13) MASTER SWITCH

(1) This switch is used to shut off the entire electrical system.
(2) I : The battery remains connected to the electrical system.
O : The battery is disconnected to the electrical system.
※ Never turn the master switch to O (OFF) with the engine running. It
could result in engine and electrical system damage.
OFF 13033CD81

14) CONTROL LEVER SWITCH (LH, RH)

STD

LH RCV lever RH RCV lever

85A3CD32A
OPT

LH RCV lever RH RCV lever

85A3CD33A

(1) This switch use to operates the breaker operation by third step.
·First
First step : Select breaker selection switch on the membrane switch.
·Second
Second step : Select Aux switch to position 3.
·Third
Third step : Press breaker operation switch.

(2) This switch operates the clamshell or shear.

※ This switch applies to double action hydraulic attachment circuit.

4-39
15) DPF (diesel particulate filter) SWITCH

Safety button (1) This switch is used to select the regeneration function of the DPF.
1 (2) Inhibit position (①)
2
① The inhibit position disallows any automatic or manual regeneration
of the DPF.
② This may be used by operator to prevent regeneration when the
2609A3CD10
machine is operating in a hazardous environment concerned about
high temperature.
③ It is strongly recommended that this position is only activated when
high temperatures may cause a hazardous condition.
(3) OFF position
This position will initate a automatic regeneration of the DPF.
(4) Manual regeneration position (②)
① This position will only initate a manual regeneration of the DPF
when the machine is in non-mission condition, engine must run at
low idle speed and DPF soot levels are high enough to allow
regeneration.
② HEST lamp will be illuminated during the entire regeneration.
※ Refer to the page 3-8 for details.
※ This switch can be move to the manual regeneration position ((②))
only when the safety button is pulled to backward.
※ Also, this switch return to the OFF position when released the
manual regeneration position (②).
( ).

16) AUX SWITCH (option)

(1) This switch is used to select the auxiliary optional functions.
① : Angle dozer
② : Off
F
F

③ : Breaker operating or 2way or 4way

O

※ Refer to the page 3-13 and chapter 4. levers and pedals for details.
85A3CD205

17) PATTERN CHANGE SWITCH

(1) The pattern change can be operated easily using this switch.
Safety button
· Position ISO : ISO type pattern
A · Position A : A type pattern
O
IS

Before starting the machine, check switch position.

A ※ Refer to the page 4-22 for the details.

ISO
85A3CD204

4-40
18) EMERGENCY ENGINE STOP SWITCH
(1) This switch is used to emergency stop the engine.
Emergency
stop
※ Be sure to keep the emergency switch on the release position when
restart the engine.

Release

210N93CD46R

4-41
GROUP 3 ELECTRICAL CIRCUIT
·ELECTRICAL
ELECTRICAL CIRCUIT (1/2)
new CASSETTE RADIO WIPER MOTOR CIGAR LIGHTER
OVERLOAD SW DPF SW WIPER SW WIPER RY WASHER SW

ANTENA POW
REMOCON GND
ACCEL DIAL
INT.WIPER RY

SPK FRT RH+

10
SPK FRT LH+

10
8

8+

1
3

4
3

6
SPK FRT RH-

4
SPK FRT LH-

8
3 1 6 4

REMOCON+

POS 1
8

POS 3
BACK UP+

87a 87 85
TEL MUTE

30 86
ANT 12V

CN-157

M
DO-1

GND
ILL+
ACC

NC

CL-2

CN-142A
NC
ILL-
NC

3
2
CS-100

CN-142
7-

CR-6

S
4 Lo

+
1 Pf
2 E
CR-4

3 B

CS-30

-
CS-3

87a
7

7
2

9
CN-27

5
7 2 5

30
86

85
87
1
3
4

2
CS-50

10

C
HARNESS CABIN

10

A
B
10

1
2
10

8
9
3

9
4

1
2

5
6

1
2

5
6
9
3

7
1
2

5
6
4

8
3

9
10
11
12
13
14
15
16

1
2

5
6
8

1.0/2.0RW
1
2
3
4
5
6
7

2.0BW
2
1

2.0Gr
CN-21
0.75Or
0.75Gr

1
2
3
4
0.75G
0.75Or

0.5RW

0.75Or

0.5RW
R14 0.75R

0.75GOr
1.0BW

0.5BW

0.5BW
0.75W
0.75R

0.5RW
0.75V
0.75B
0.75B
0.75B

0.75B

0.75V

0.75B
1.0BW

0.5BW
1.0R
1.0R
1

0.75G

0.75G
0.75V
0.75LY
SPEAKER LH

0.75R
0.75Y
R05 0.75G
2

0.75RW

0.75YW

0.75Gr
141L 1.0BW

141G
0.75G
0.75Or

0.5RW
0.5BW
0.5BW

0.5BW
0.75W
0.75G

0.75R

F27
0.75B

0.75B

L02
F15B 1.0R
0.75L

1.0Gr

141H
1.0V
CN-23

L02L
141N
L02C

F15A

M42
141P

F15C
F15D
F07B

42

44
1A
1B
36

38
36

141K
411A

L02A
40

38
39
1

36A
R11 0.75YW

411

411
1

K31
A60
K29
SPEAKER RH

40

PARK 39
R04 0.75L

L02G
F07A

141S
L02F
2

M33
R04
R05

R11

R14
F01
142

142

422

141
141

ON
CN-24

B+
CL-1

REGEN

INHIBIT
G 0.75B

COM
1
CN-9 F04 0.75Lg
2
1
141 2.0BW 1.0B G ROOM LAMP
2
3
4 CL-7

2.0
L06 1.0Or 0.75Or L06 L06 0.75Or
5 2
141 2.0BW 1.0B G G 0.75B M
6 1
F04 1.0RW 0.75Lg F04
7 BEACON LAMP
L08 1.0G 0.75G L08
8
9 CL-09
G 0.75B
CN-427 10 1
L08 0.75G
11 2
TAG READER

0.75L M21C
SMARK KEY

CAN2 LOW 4 L02 1.0/2.0RW 0.75ROr L02

0.75Y M20C 12
CAN2 HI 3 CABIN REAR LIGHT

0.75ROr L02
R14 R14 0.75R 0.75R R14

G
1.0BW 141F 13
GND 2 R11 R05 0.75G 0.75G R05
0.75RL F08B 14 G4

0.75B
IG 24V 1 R05 R11 0.75YW 0.75YW R11
15
R04 R04 0.75L 0.75L R04

CL-03
16
BUTTON START RELAY 2 1
CS-02B
1.0BW 141E
CL-02

1.0RW
SHD C

1.0BW
OPTION L 0.75L M21B 141 1.0BW
CAN LOW B 1
Y 0.75Y M20B L02 1.0RW
CAN HI A 2
GND

L02

141
CABIN FRONT LIGHT
BUTTON ST 6 6 CL-04
141A 1.0BW
SWITCH 5 5 1
610 L02A 1.0RW
GND 3 3 GND 4 4 2
611
SIG 2 2 SIG ACC 3 3 CABIN FRONT LIGHT
612
5V 1 1 5V B 1 1 CN-13
951 AVS 8.0W
CN-641 BR 2 2 1 1 POWER RELAY
961 AVS 8.0R
2 2 POWER RELAY
CN-641 CS-02C CS-02A CS-2
CN-15
601 AVS 5.0W
1 1 B+
STC

6 CS-2
5
1.0G K36
6
H BRACC

3 5
2
B

1 4
0.75BrW 748A
4 3
0, I

0.75BrW 748
2
1.0V F02B
H0 I

START SW
CN-04 NO. DESTINATION
401 1.0RW
1 1 ECM_IG
748 0.75BrW
2 2 POWER RELAY
K31 0.75Y
CR-35 3 3 ECU(31)
A60 0.75R
86 30 87a 4 4 ECU(60)
1.0BW 141D K29 0.75LY
85 5 5 ECU(18)
0.75Or F40 H10 0.75Or
87 6 6 QUICK COUPLER(+)
0.75BrW 748B H11 0.75B
86 7 7 QUICK COUPLER(-)
85 87 87a 1.0V F02 F06 1.0R
30 8 8 ECM_POWER 12V
F06A 0.75R
IGNITION 9 9 ECM_POWER 12V
410 0.75YL
10 10 AC COMP
411 0.75G
CR-2 11 11 WASHER P/P
F17 0.75RW
86 30 87a 12 12 SOL 1 FUSE
1.0BW 141U R285 0.75OrW
85 13 13 HORN RY(JOYSTICK)
1.0GOr R287 R287 1.0GOr
87 14 14 HORN
0.75OrW R285 F14 1.0G
86 15 15 FUEL FILLER PUMP
85 87 87a 1.0G F28 F19 1.0BW
30 16 16 SAFETY SW & SOL.
417 0.75Br
HORN RY 17 17 AC DPS
418 0.75BrG
18 18 AC DPS
F18 1.0GW
CR-45 19 19 ALT
F11 2.0L
86 30 87a 20 20 SOL 2 FUSE
1.0BW 141T F29B 1.0Or
85 21 21 SOL 3 FUSE
1.0RW 401 422 1.0Gr
87 22 22 OVER LOAD SENSOR(B)
0.75BrW 748C L02H 1.0RW
86 23 23 ILLUMINATION
85 87 87a 1.0V F02 F09 0.75LW
30 24 24 MCU IG
F05 1.0BW
ECU IGNITION 25 25 MCU B+
F26 1.0R
26 26 EPPR POWER
965 1.0R
27 27 SAFETY SOL
M33 1.0V
28 28 MCU(64)
F15 1.0R
29 29 CIGARLIGHTER/WASHER P/P
964 1.0W
30 30 SAFETY SOL SIG (-)
951
601

961

K35 1.0GR
31 31 START SIG
F22 1.0RW
32 32 FUEL FEED P/P
33 33 BREAKER SOL
34 34 BREAK SIG(JOYSTICK)
M26 1.0G
35 35 BREAK SIG(MCU)
36 36

40A
SPARE
33
40A SPARE
10
20A SPARE
32
20A SPARE
31
20A SPARE
30
20A CN-14
SOLENOID 3 1.5Or F29 141A AVS 8.0BW
29 1 1 GND
20A HORN 1.0G F28 142A AVS 8.0B
28 2 2 GND
20A CIGAR 2.0Gr F27
27
20A EPPR POWER 1.0R F26
26
20A 12V OUTLET 2.0R F25
25
10A HEAT-SEAT 1.0G F24
24
10A PRE-HEAT 1.0Y F23
BATT 23
IG 10A FEED PUMP 1.0RW F22
22
20A CABIN LAMP 1.0R F21A
21
20A BEACON LAMP 1.0R F20A
20
10A SAFETY SOL 1.0BW F19
19
2.0 Or

20A
8.0W

ALT,START 1.0GW F18A

18
BATT 20A SOLENOID 1 2.0RW F17A
17
IG 20A AC HEATER 1.0OrW F16A
16
20A WIPER 1.0R F15
15
20A FUEL FILLER PUMP 1.0G F14
14
20A WORK LAMP 1.0YW F13A
13 CN-08 NO. DESTINATION
20A F25 2.0R
HEAD LAMP 1.0R F12A 1 1 12V OUTLET
12 K73 0.75G
20A SOLENOID 2 2.0L F11 2 2 START RY COIL(+)
11 K28 0.75P
10A 3 3 START RY COIL(-)
RELAY 9
MCU 0.75LW F09 K70 0.75LW
4 4 PREHEAT COIL (+)
IG F40 10A CLUSTER 0.75RL F08A
8 5 5 CAM GND
10A CASSETTE,SW PANEL 0.75Or F07 6 6 NC
7 K68 0.75L
20A ECU AVS 3.0R F06B 7 7 EGR VALVE ECU_RY+
6 A80 1.0Or
10A 8 8 EGR VALVE RY_C
MCU 1.0BW F05 M25 0.75P
5 9 9 LIMIT START-LEVER
20A ROOM LAM&AC HEATER 2.0RW F04A 241 0.75V
4 10 10 PREHEAT CONTACT
B+
5W

601 10A CLUSTER 1.0Y F03B 11 NC

3 11
20A 231 0.75BW
START KEY 2.0V F02A 12 12 START RY CONTACT
2 963 1.0B
10A 13 13 ANGLE DOZER SEL SOL(-)
CASSETTE 0.75W F01 K02 0.75B
1 14 14 PREHEAT COIL (-)
962 0.75Y
15 15 ANGLE DOZER SEL SOL
CN-36 FUSE BOX

THERMISTOR
MODE-1 ACT'R MODE-2 ACT'R TEMP ACT'R INTAKE ACT'R BLOWER RELAY BLOWER CN-05 NO. DESTINATION
L04 1.0Br
1 1 WORK LAMP
L09 0.75B
M

2 2 TRAVEL ARALM (MCU)

M
3

M M
1

M M02 0.75Gr
3 3 AC RUN SIGNAL
42 0.75GOr
1

ACCEL 5V
2

4
4
2

4
M42 0.75W
1
5
6
7
5
6
7

5
6
7
1
2
3
4
5
6
7

1
2
3
4

1
2
3
4

2
1
2
3
4

5 5 ACCEL DIAL SIG

33
34

44 0.75B
1

4
2
3

6 6 ACEEL GND
8C

7C

8D
7A

8A

7B

8B
23

21

22

26

24

25

20

18

19

17

16

15

9
7

N35 0.75G
7 7 HOUR METER
2A
29A
3

33

508 0.75Gr
8 8 CAMERA 6.5V
509 0.75G
9 9 NTSC +
510 0.75V
10 10 NTSC -
511 0.75B
11 11 CAN_SHIELD
512 0.75B
12 12 CAMERA GND
513 0.75B
13 13 CAN_SHIELD
M21 0.75L
14 14 CAN_Lo
M20 0.75Y
15 15 CAN_Hi
INCAR SENSOR
16 16 NC
11
1
8E
2
AMBIENT SENSOR
12
1 CN-11
8F
F16

1 1.0BW 141B
2 1 CN-48

F03
29 2.0BW 141C N35 0.75G

142
2

m25
3 SIG

K28
K73

A80
K70

K68
1.0OrW F16B

241
2 142E 0.75B
3 CN-125A 2 (-) H
13 0.75Y F03A F03 0.75Y
4 BATTERY POWER 1 1 (+)
3 1.0RW F04 0.75RL F08
5 KEY "IG" 2
31 0.75BR 417 0.75Y M20A HOUR METER
6 CAN (HIGH) 3
32 0.75Gr M02
7 RX232(1)-TX 4
4 1.0RW L02K
8
F12

GND (SERIAL) 5
F13
L03

F20

RX232(2)-TX 6
AIR CON RX232(2)-RX 7
0.75B 513A
CAN (SHIELD)

K02
8
NO.
F16
F16

DESTINATION
418
410
34
28

RX232(1)-RX 9
1

1 GND(CONTROLLER)
F/W DOWN 10
F21/F21A
1A

3A

11
12
13

15
16
17
18
19
20
21
22
23
24
25
26

28
29
30
31
32

142G

142F
2 GND(BLOWER) 0.75L M21A
2

7
8
9

142B

M20
M21
F03
F08
508

509
510
512

566
567
568

568
567
566
1 2 3 CAN (LOW) 11
F24
0.75BrG

1.0OrW

142C
0.75YL

0.75Or

3 FUSE(IG) 0.75B 142H

M28
F07

F21
L01
L03

L05
L07
L09

L07
L08

K02A
F29A

F19A
F19B

F18B
141V

1.0YW F13/F13A

F20/F20A

F12/F12A

MAIN GND 12
M25
K35

K36

K28

K73

K02

K70

A80
K68
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32

F12
F12

F18

F23

F06
L07
L10

962
963

964
965

231

241
1
2
3
4
5
6
7
8
9

4 MCU
RMS
1.0RW L02J
1.0YW F13

F20

F12

5 FUSE(Battery)
0.75V L03
L04

0.75Br L05
L06

0.75B L01

H10
H11

0.75RL
0.75Gr
1.0G
1.0B

1.0ROr
1.0ROr

0.75G
0.75Or

0.75Or

0.75Or

0.75R

0.75R
MODE-1 ACT'R (FOOT)

MODE-2 ACT'R (FOOT)

0.75B

0.75V
0.75B

0.75Y

0.75Y

0.75B
0.75B

0.75B
0.75Br
CR-7
MODE-1 ACT'R (VENT)

0.75L

0.75L

0.75L
6 DPS(COMPRESSOR)
0.75B
0.75V

0.75B

0.75B

G
87

1.0ROr
30
85
BLOWER RELAY (LO)

86
MODE-1 ACT'R (PBR)

MODE-2 ACT'R (PBR)

TEMP ACT'R (WARM)

87a

0.75Or

0.75Or
MODE-2 ACT'R (DEF)

1.0BW

1.0BW
1.0BW

1.0G

1.0G
INTAKE ACT'R (REC)
INTAKE ACT'R (PBR)
INTAKE ACT'R (FRE)

TEMP ACT'R (COOL)

0.75Y

1.0Or

0.75GW
1.0Br
1.0W

0.75BW

0.75LW
1.0R
1.0R

1.0R

1.0R
1.0R

1.0R
1.0R
1.0B

7 CONDENSOR FAN
TEMP ACT'R (PBR)
AMBIENT SENSOR

1.0GW
CONDENSOR FAN

1.0GR

CN-27A
0.75G
0.75P

0.75P

0.75B
0.75V

0.75B
1.0Or
0.75L
85 87 87a

CN-56
1.0G

1.0R
THERMISTOR(+)

1.0Y

S D

CN-56A
INCAR SENSOR

CN-170

8 ILLUMINATION
COMPRESSOR

0.75Or
REVERSE FAN

0.75B
SENSOR REF

1
2
3
4
5
6
7
8
CR-44
FET (F/BACK)

86 30

1
2
3
4
5
6
7
8
CR-385

1
2
3
4
5
6
7
8
CR-13

CN-116
CR-85

4
5

8
2

6
CR-438

12
11
FET (GATE)

10

87

30
85

86
ACT'R REF

CR-9

87a
CR-68

CR-36
1
2

87

87
30

30
85

85
86

86

FET
87

30
87a

87a

CR-5
85

86

SPARE
87a

CR-80
87

87

87
CR-3
30

30

30
85

85

85
86

86

86
87a

87a

87a

CN-113

87

30
85

86
87

87

87a
30

30
85

85
86

86
TAIL(+)

85 87 87a

87a

87a

87

30
85

86
87

87a
30
85

86
87a
85 87 87a

85 87 87a
85 87 87a
BATT

85 87 87a

85 87 87a

85 87 87a
GND

1
2

SEAT HEATER
IG2

85 87 87a
ILLUMINATION OUT

86 30
NC

NC

85 87 87a

85 87 87a
NC

NC
NC

85 87 87a
85 87 87a
86 30

86 30

USB GND

AUX GND
WORK LIGHT OUT

CABIN LIGHT OUT

86 30

AC COMP
86 30

86 30

86 30

USB D+
USB 5V
POWER 12V(IG)

USB D-
86 30
TRAVEL ALARM

86 30

86 30
BEACON LAMP

AUX R
86 30

AUX L
86 30

AC&HEATER CONTROLLER

BATTERY 12V

NC
POWER_IG
CAM_ 6.5V

MAIN GND
BREAKER

CAM GND

AUX GND
CAN LO
WORK LAMP

NTSC +

CAN HI
NTSC -

AUX_L
WORK LAMP ILLUMINATION

AUX_R
BEACON LAMP BUZZER

CAM1
CAM2
CAM3
ANGLE DOZER SAFETY SOL WORK LAMP
GND

GND
CABIN REAR LIMIT START ANTI-RESTART PRE-HEAT RY EGR VALVE
CABIN FRONT
NC
NC
NC

NC

SELECT BOOM SPARE Connect to Radio

SOL
SWITCH PANEL CLUSTER
STD OPTION
20MQ-98104

4-42
 CN-310
n04 N4 0.75B
1
n09 N9 0.75RW A1-RELEASE
2

NC
NC

NC
NC
CN-311

ALT
n03 N3 0.75BW

HORN
1

NTSC -
NTSC -

CAN_Hi

NTSC +
CAN_Lo
MCU IG

NTSC +
AC DPS
AC DPS
ECM_IG

MCU B+
n08 N8 0.75Or A2-CLAMP

CAM GND
BATT. RY

AC COMP

ACCEL 5V
2

BUZZER(-)
BUZZER(+)

SOL 1 FUSE

START SIG.
·ELECTRICAL

ACEEL GND
SOL 2 FUSE

12V OUTLET
SOL 3 FUSE

CAN_SHIELD
WASHER P/P

SAFETY SOL

WORK LAMP
DPF SWITCH
DPF SWITCH
DPF SWITCH

CAMERA 6.5V
CAMERA 6.5V

CAMERA GND

CAMERA GND
HOUR METER
EPPR POWER
ILLUMINATION

SAFETY LEVER
BREAKER SOL
FUEL FEED P/P
OVER LOAD SW

ACCEL DIAL SIG

AC RUN SIGANL
TRAVEL ALARM

CAMERA SHIELD
EGR VALVE ECU
OVER LOAD SW
CN-312

START RY COIL(-)

PREHEAT COIL (-)

EGR VALVE RY_C
ECM_POWER 12V

START RY COIL(+)
ECM_POWER 12V

PREHEAT COIL (+)

n02 N2 0.75BR

FUSE_SAFETY SOL
FUEL FILLER PUMP

SAFETY SOL SIG (-)

PREHEAT CONTACT
1

START RY CONTACT
A3-CW ROTATE

HORN RY(JOYSTICK)

DESTINATION
DESTINATION
n07 N7 0.75W

BREAK SIG(JOYSTICK)
2

ANGLE DOZER SEL SOL

DESTINATION

BREAK SIG(MEMBRANE)

BATT.RY(IG)
BATT.RY(IG)

ANGLE DOZER SEL SOL(-)

CN-313

B+
N1 0.75BY

CIGARLIGHTER/WASHER P/P
n01

GND
GND
1
n06 N6 0.75G A4-CCW ROTATE
2

6
5
4
2
3
1
1
2
1

9
8
7
6
5
4
3
2
1
9
8
7
6
5
4
3
2
1
2
1

16
15
14
13
12
11
10
15
14
13
12
11
10

NO.
NO.

CN-249
9
8
7
6
5
4
3
2
1

36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
NO.

EARTH 4
EARTH 4

0.75B
0.75V
0.75G
2
2

9
8
7
5
9
8
7
5

4
1
4
1

6
6

3
3

16
15
14
13
12
11
10
15
14
13
12
11
10

0.75GrW
2

9
8
7
5
4
1

6
3

36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10

2
1

2
1

CN-05
CN-08
CN-04

CN-15

CN-13
CN-14

111
115
113
112
0.5L

Pa
1.0Br
2.0B
1.0B
0.5P
0.5Y

0.75L
1.0R
1.0R
1.0R
2.0R
1.0R

1.0G
1.0G

0.75Y
0.75B
0.75B
0.75B
0.75V
0.75B

0.75G
0.75G
ELECTRICAL CIRCUIT (2/2)

0.75W
1.0Or
0.75L
1.0Gr
1.0Or
1.0Gr

0.75B
0.75V
0.75V
0.75Y
0.75B
0.5LY

0.75Gr
0.75R

0.75G
0.75G
0.75G
1.0LW

0.75RY
0.75Br
1.0RW

0.75GrR
0.75LW
1.0OrW
0.75LW
0.75LW

0.75BW
0.75BW

0.75GrW
0.75RW
0.75RW

0.75GW
0.75GOr
0.75BrW

0.75OrW
0.75OrW

1.0/0.75L

AVS 8.0B

1
2
AVS 8.0R
AVS 8.0W
AVS 5.0W

2
1
2
1
AVS 8.0BW

CD-10

CD-01
CD-02
CN-66R

L9
F17 0.75RW

68
L2

F5
F9
F8

K2
K1

116
115
114
113
112
111
110
M2
M5

N35

M20
M21
M15
2

231
241
108
107
106
105
104
103
102
101
748
100

F25
F26
F29
F14
F17

A80
K68
K70
K28
K73
K35
K18
A60
K31

H11
H10

M25
M28
M33
K1C

M2A
G2
G1

HYD OIL TEMP

N36-2
m08

R287
R285

M16-2
M44-2
961
951
601
M08 0.75YG
1

0.75B
0.75B
0.75B

AIR CLEANER SW
0.75Or

0.75YR
0.75YW

EARTH 2
FUEL LEVLE SENDOR
READY SOL

CN-439

3.0
AC

F8A 0.75L
2

N29
N47

M47
M36
M48
M47
BREAKER SOL.

m01 M1 0.75BR
MODE

CN-437
F8B 0.75L
2
SOL

m03 M3 0.75BW
1
FLOAT
DOZER

CN-145
1.0R 108
M 2
1.0B G4

FUEL
1

FEED P/P
2 1.0R 108A
1 1.0B G5

sig

DO-2
CN-70
F17 0.75RW
2
SOL

m09

SUPPLY
M9 0.75B

RETURN
CN-51, LEFT "A" 1

B
A

C
48P, 64320-1319

CD-31
BROEN

OVERLOAD
CN-438
CN-52 RIGHT "B" 438 1.0Or
2
TRAVEL SOL

m02a

0.75B
0.75Y
0.75Gr
48P, 64320-3311 M2A 1.0B

sig
sig
1
SELECT

BLACK 0.75B M2

PS(A)
106
N24

M16
ANGLE DOZER SELECT SOL. A02

SUPPLY
SUPPLY

RETURN
RETURN
0.75B M9
TRAVEL SPEED SOL(DO) A09 438

B
A
B
A
B
A

C
C
C

CD-7
ANGLE DOZER

CD-32
CD-31
F17

MCU
0.75RW N9

BOOM UP PS
EPPR 1(+) A1 B09
0.75B N4

0.75L
1.0Gr
EPPR 1(-) A1 B04

0.75B
0.75Y
0.75B
0.75Y
0.75B
0.75Y

0.75G
F08
0.75Or N8
EPPR 2(+) A2 B08
0.75BW N3
EPPR 2(-) A2 B03
0.75W N7
EPPR 3(+) A3 B07
0.75BR N2

106
N24

M45
M42

LOAD SENSING(WORKING)
EPPR 3(-) A3 B02

N24B
N24A

M16B
M16A

M16C
0.75G N6
EPPR 4(+) A4 B06
0.75BY N1 CN-140
EPPR 4(-) A4 B01
M13 0.75B
1
SOL

H10 0.75LW
QUICK

2
COUPLER

NC B25
CN-22
NC B37 107 1.0OrW
0.75YG M08 2 M
P/P

BREAKER READY SOL A08 102 1.0Gr

1
WASHER

0.75BW M3
DOZER FLOATING SOL. A03 CS-16
0.75BR M1 F14 1.0G
2

AC MODE SOL. A01

SW

119 1.0R
1
FUEL

0.75YR M36
HYD. TEMP SS(AI) A36
0.75L M42 CN-61
BOOM UP PS(AI) A42 G21 1.0B
0.75G M45 1 M
LOAD SENSING PS A45 119 1.0R
PUMP FUEL

2
PUMP

0.75YW M48
FUEL LEVEL(AI) A48
0.75Y N24
10V POWER OUTPUT B24
0.75V M26 CN-29
ALT. LEVEL(AI) A26
0.75R F26 103 0.75Br
EPPR POWER IN 12V B10 2 Pa
0.75BW F5 104 0.75LW
BATTERY POWER B12 1
0.75L F9
R/DRYER

IGNITION 12V B23

0.75W N39
2 SPEED SIG B39 CN-28
0.75Y N38
DOZER FLOATING SIG B38 101 1.0LW
0.75LW N42
ANGLE DOZER(DI) B42
0.75Br N26
AUX SELECT SWITCH B26
0.75Lg M27 CN-62A
AC COMP

ANGLE DOZER SIG(AI) A27 118A 0.75L

0.75G M32 2
SEAT BELT SIG A32 G17 0.75B
0.75Or M29 1
SAFETY LEVER SIG A29
0.75W M34 CN-62B
CRUSHER(RCV RH) A34
M46 118 0.75L
0.75LY 2
ROTATING(RCV LH) A46
CHANGE

G16 0.75B
PATTERN

0.75V N48 1
5V POWER OUTPUT B48
0.75B M16 CN-12 CN-12A CL-5
GND_MAIN A16
N36 G20 1.0B 1 1 1.0B
0.75Gr 1 1 1
5V POWER OUTPUT B36 110 1.0Br 2 2 1.0RL
2 2 2
0.75Or N29
AIR CLEANER SW(DI) B29 CL-6
0.75GrR M15 1A 1.0B
AC RUN SIGNAL A15 1
0.75OrW M25 2A 1.0RL
LIMIT START RELAY A25 2
BOOM LAMP

0.75G M28
BREAKER SWITCH A28
0.75V M33 CN-68
OVERLOAD PS A33 68 0.75Y
2
N43 G15 0.75B
0.75B 1
SOL

TRAVEL DI (ECHO) B43

0.75W M44 EARTH 2
ACCEL DIAL SIG(AI) A44
SAFETY

1.0B M11-1 EARTH 3

MAIN GND A11
1.0B N11
MAIN GND B11
0.75G M5
SAFETY SOL A05
BREAKER OPERATING SW B34
0.75RW L2 CN-25
ILLUMINATION B46 G19 0.75B
0.75G N35 1
HOUR METER B35 R287 0.75GOr
0.75BW M17 2
HORN

PROGRAM DUMP(DI) A17

0.75B H11
QUICK COUPLER SW1(DI) B31
0.75Lg N32 CS-33
QUICK COUPLER SW2(DI) B32
G05 1.0RW
3

0.75B M13
2

QUICK COUPLER SOL(DO) A13

G06 1.0Or
2
1

0.75G N17
RS232_RX(1) B17
3

0.75R N18
RS232_TX(1) B18
6

0.75L M21
5

J1939 CAN_Lo(2)C A21

4

0.75Y M20
J1939 CAN_Hi(2) A20
EM'CY STOP SW

0.5L K53
T

J1939 CAN_Lo(1)E A19

0.5Y K75
EARTH 3

J1939 CAN_Hi(1) A18

0.75B N14 6 6 CS-4
GND_COMMUNICATION B14 G16 0.75Or
1
3
1

5 5
G20 0.75L
0.75B N47 4 4 2
GND_DIN B47 G03 0.75Or
0.75B M47A N36 0.75Gr 3 3 0.75Gr N36-2 3
GND_RES SIG A47 G21 0.75Br
M44 0.75W
4
2

0.75G N44 2 2 0.75W M44-2 4

ECO MODE SW(DI) B44
M16 0.75B 1 1 0.75B M16-2 CN-07
H11A 0.75B 0.75B H11
CN-16A CN-16 1 CS-4A
G6 0.75B 0.75BW G02 G20 0.75L
2 1
3
1

K86 0.5Or 0.75Or G03 G02 0.75BW

SAFETY SW

3 2
K87 0.5B 0.75B G04 G21 0.75Br
4 3
100 1.0RW 1.0RW G05 G04 0.75B
4
2

CN-126 5 4

2.5k

2.5k
0.75B N14 K88 1.0Or 1.0Or G06
1 6 CN-240

CAN2_L
H10A 0.75LW 0.75LW H10

CAN2_H
0.75G N17

CAN_L
12V+
7

CAN_H

GND
2 1
L

6
5
4
1

3
0.75R N18 F17A 0.75RW 0.75RW F17
8
SW3

CN-16B
3 2

RS232
6
5
4
3
2
1

CONN.
G6A 1.0B 1.0B G09

CN-148
0.75BW M17 9
4 1
B

N38 0.75Y 0.75Y G10 GUN

10
SW2
SW4

2B m11 2

0.75P
0.75B

0.75R
N39 0.75W 0.75W G11

0.5L
0.5L
11

0.5Y
0.5B
0.5Y
1

0.5Or
Gr

M27 0.75Lg 0.75Lg G12

SERVICE TOOL(SA-D)
12 NC
SW1
SW3

2
M16D 0.75B 0.75B G13 G15 0.75LY
13 C ROTATING
CN-240D CN-240A

SIG
RCV LH

N48 0.75V 0.75V G14 G13 0.75B

K43
K61
K62

EARTH 1
14 B PROPORT
RETURN

K65
K53
K75
K90

M21
M20
M46 0.75LY 0.75LY G15 G14 0.75V -IONAL
15 A 5V
CN-240B CN-240C

CN-93A M29 0.75Or 0.75Or G16

2.0R K1 3.0 16 CS-67
POWER 12V 1
2.0B K2A 10
MAIN_GND 2
2.0R K1A 9
POWER 12V 3 L02A 0.75RW
2.0B K2B 8
MAIN_GND 4 G09 1.0B
2.0R K1B 7 6
POWER 12V 5 5
2.0B K2C 6 4
MAIN_GND 6 G09A 1.0B POS 1
5 3
NC 9 H11 0.75B 2
4 POS 3 1
NC 10

ECU
3

CASE
NC 13 F17 0.75RW

EARTH
2
QUICK COUPLER

NC 14 H10 0.75LW 7 8
0.75Br K15A 1
ENG. OIL PS 15

4-43
NC 16
NC 17
0.5LY K18 CS-113 (BR11)
DPF REGEN SW 18
NC 19 10
0.5G K20
INTAKE THROTTLE 20 9 9 10
0.5BW K21
NEW TEMP SENSOR 21 8 POS 31
NC 22 7 2
0.5R K23
INTAKE THROTTLE 23 6 POS 3
SWITCH-AUX

0.75Y K24 4 AUX SIG

DPF PRESSURE SENSOR 24 5 5
NC 25 4
NC 26 3
NC 27 2
0.5P K28
START RY COIL(-) 28 1
NC 29
0.5Y K31 CS-113 (BR12)
NON DPF REGEN SW 31
0.5L K33 1 1
EGR. TEMP SENSOR 33 F29 1.0Or 7 8
0.75G K35 2 2
KEY. START SIG. 35 438 1.0Or
3 3
NC 36 N26 0.75Br
4 4 1
NC 37 12A 1.0B 2
5 5 3 A/DOZER SOL
NC 38 N42 0.75L
0.5W K39 6 6 4 AUX SIG
EGR PRESSURE SENSOR 39 N42 0.75L 5
7 7 6
NC 40 L02 0.75RW A/DOZER SIG
8 8
NC 41 CN-06 N26 0.75Br
9 9
NC 42 N26 0.75Br 0.75Br N26 L02C 0.75RW 9 10
0.75R K43 1 10 10
AUX & ANGLE DOZER SW

ACCELERATOR1(5v) 43 N42 0.75LW 0.75L N42

2
ACCELERATOR3(OPT) 44 M32 0.75G 0.75G 03 CS-76
0.5R K45 3
EGR Ps SENSOR(5V) 45 M34 0.75W 0.75W 04
4 10
NC 46 F29 1.0Or 1.0Or F29
5 9
NC 47 118 0.75L 0.75L 06 06B 0.75L
6 8
NC 48 ILLUMINATION L2A 0.75RW 0.75RW L02 12D 1.0B
7 7 6
NC 49 F8 1.0/0.75L 0.75L F08 5
8 6 4
NC 50 438 1.0Or 1.0Or 438 F08 0.75L
9 5 3
NC 51 R285 0.75OrW 0.75OrW 10 06A 0.75L 2
0.5Br K52 10 4 1
INTAKE THROTTLE 52 F25 1.0R 1.0R 11
PATTERN CHANGE

0.5L K53A 11 3
YDT(CAN2_L) 53 G6 1.0B 1.0B 12 F08B 0.75L
0.5P K54 12 2
EGR VALVE 54 N32 0.75Lg 0.75Lg N32 06 0.75L 7 8
13 1
NC 55 N44 0.75G 0.75L N44
0.5Y K56 14
DPF OUTLET TEMP 56 B34 0.75GW 0.75GW B34
15 CS-80
NC 58 L02D 0.75RW
10
NC 59 N44 0.75L
0.75P K61 9

ECU
ECO

ACCELERATOR1 61
MODE

0.75B K62 8
ACCEL_GND 62
0.75Y K63 7 6
DPF PRESSURE SENSOR 63 5
0.5B K65 6 4
YDT(GND) 65 12K 1.0B
0.5V M26B 5 3
ALT LEVEL 66 N44 0.75L 2
4 1
NC 67
0.5L K68 3
EGR VALVE RY(+) 68
0.75LW K70 2
GLOW RY COIL(+) 70 7 8
1
NC 71
NC 72
1.0G K73 CN-139
START RY COIL(+) 73
0.5B K74
EGR PRESSURE SENSOR 74 12 1.0B
0.5Y K75A 1
YDT(CAN2_H) 75 11 1.0R
0.5L K76 2
EGR VALVE 76
0.75L K77
DPF SENSOR_GND 77
0.5P K79
12V SOCKET

NEW TEMP SENSOR 79

0.75Y K80 CS-162
DPF INTERMEDIATE TEMP 80 03 0.75G 162 1.0B
0.75Y K81 1
1

DPF INLET TEMP 81

NC 83 12E 1.0B 12
2

2
NC 84
0.5Y K85
SEAT BELT

EGR PRESSURE SENSOR 85

0.5Or K86 CS-26A
REGERATION INTERLOCK SW 86 F17B 0.75RW
0.5B K87 1
SWITCH COM 87
1.0Or K88
IG POWER 88 H02A 0.75GW
2
NC 89
propotional

0.5Or K90
FOOT PEDAL

YDT(12V) 90
CN-241
NC 92 F17A 0.75RW
1
B

NC 93 10 0.75OrW HORN
SW3

2
NC 94 12J 1.0B
CN-241D

1
B

N32 0.75Lg GUN

SW2

CN-93B 2
1.0Or A1 12 0.75RW
1
CN-241B

INJECTOR 2 1
BREAKER
Gr

1.0Br A2 B34 0.75GW

SW1

INJECTOR 3 2 2
RCV RH

1.0Y A4 04 0.75W
CN-241A

SUPPLY PUMP 4 C SIG

1.0P A5 G13A 0.75B
SUPPLY PUMP 5 B PROPORT CRUSHER
RETURN
0.5R A7 G14A 0.75V -IONAL
PRESSURE SENSOR_RAIL 7 A 5V
0.5RW A8
CAM SPEED SENSOR 8
0.5L A11 12F 1.0B
FUEL TEMP SENSOR 11 1
0.75L A12 G10 0.75Y
DPF PRESSURE SENSOR 12 2 FLOAT
12G 1.0B
NC 15 1
1.0R A16 G11 0.75W
DOZER LEVER

INJECTOR 4 16 2 2 SPEED
CN-442B

1.0L A17 G12 0.75Lg

INJECTOR 1 17 C ANGLE DOZER
SIG
1.0Y A19 G13B 0.75B
INTAKE THROTTLE 19 B PROPORT
RETURN
1.0LW A20 G14B 0.75V -IONAL
INTAKE THROTTLE 20 A
CN-241C CN-442A GUN CN-442C

5V
0.5BW A25
PRESSURE SENSOR_RAIL 25 12H 1.0B
0.5G A26
PRESSURE SENSOR_RAIL 26
0.5G A28
ECU

COOLANT WATER TEMP 28

0.5L A29
COOLANT WATER TEMP 29
NC 30
1.0YR A31
INJECTOR 2 31
1.0G A32
INJECTOR 3 32
1.0LW A33
INJECTOR 4 33
NC 34
0.5L A37
CAM SPEED SENSOR 37
0.5B A38
CRANK REV SENSOR SHIELD 38
0.5Y A39
L9

CRANK REV SENSOR 39

N43
F17B
N43A

1.0W A47
INJECTOR 1 47
1.0R A50
COM IG POWER 50
0.5BrW A51
FUEL TEMP SENSOR 51
0.75B
0.75B

0.5BL A52
0.75RY
0.75RW

CAM SPEED SENSOR 52

0.5L A54
CRANK REV SENSOR 54
1.0R A60
2
1
1
2

60
961
951

COM IG POWER
601

0.5WY A59
CN-81

IM TEMP SENSOR 59
CD-11

Pa

TRAVEL BZ

CR-01
A51
A11
K56
A38
A54
A39
A52
A37
A08
A25
A26
A07
K33
A59
A20
A19
K52
K20
K23
K76
K54
A80
A29
A28
K21
K79
K74
K39
K85
K45

K2D
EARTH 2

961 AVS 8.0R

TRAVEL ALARM PS

87 30 86
960 AVS 8.0R
A5
A4
A2
A1

30
A32
A31
A17
A47
A16
A33

A5A
A4A
0.5L
0.5L
0.5L
0.5L
0.5L
0.5L

0.5Y
0.5B
0.5Y
1.0Y
1.0B
0.5P
0.5P
0.5B
0.5Y

0.5R
0.5R
0.5R

0.5G
0.5G
0.5G
0.5W
70A

0.5Br

REV

748 0.75BrW
1.0Or

0.5BL

SENSOR
SENSOR
1.0LW

0.5BW
0.5WY
0.5BW

0.5RW

86
0.5BrW

FUEL TEMP

CRANK

CAM SPEED
38

G10 0.75B
85 87 85
36

1.0L

1.0P
1.0P
1.0Y
1.0Y
1.0R
37

1.0G
1.0W

1.0Br
1.0Or
1.0YR

CR-02
1.0LW
CK

CM

951 AVS 8.0W

2
2
2

5
5
5

4
1
4
1
4
1

9
8
7
6
9
8
7
6
8
7
6

3
3
3
CN-300A : Au

30 86
12
10
12
10

11
11

87
950 AVS 8.0W
2
1

2
1

3
2
1

39

30
CN-303
CN-302
CN-301

41
40
70A

731 AVS 15.0R

748A 0.75BrW
2

5
4
1

9
8
7
6
3

86
CN-300B,C : Ni/Pd/Au

12
10
11
POWER RELAY

42

G11 0.75B
731A AVS 8.0R

0.5L
0.5L
0.5L
0.5L

0.5P
0.5P
0.5P
0.5B
0.5Y

0.5R
0.5R
0.5R

0.5G
0.5G
0.5G

87 85
451
452

0.5W

85
0.5Br

0.5Or
L

0.5BL
1.25Y
1.25B
S

43
0.5BW
0.5BW

0.5RW
1.25Or

CN-304
0.5BrW
1.25LW
CS-73

67

67
241
611
231
611
451

G13
G12

1.25L

1.25P
1.25Y
1.25Y

1.25P

1
1.25R

1.25G
1.25W

1.25Br
1.25Or
1.25YG

1
1.25LW
601
960
950

2
611A
731A
731B
731C
731D
K15
A50
K15

2
MASTER SW

AVS 5.0W
AVS 8.0W

60R

3 1
741
105

0.75V
0.75B
0.75B
741
452
741A

M26

AVS 5.0R
AVS 5.0R
M26A

AVS 5.0W
AVS 5.0W

K81
K80
K77
K24
A12
K63
0.75BW

4 2
AVS 5.0W

WATER NEW
K77B
K77A

TEMP TEMP
1.0R
1.0Br
1.0Br

M 5
AVS 5.0R
AVS 8.0R
AVS 8.0R
AVS 8.0R

AVS 5.0W
AVS 5.0W
AVS 8.0W
AVS 8.0W

2
60R

6
M
0.75V
0.75V

86
86

30
30

85
85

87
87
B+
0.75Gr
0.75Gr
0.75Gr

1
0.75GW

0.75L
0.75L
0.75L
0.75L

0.75Y
0.75Y
0.75Y
0.75Y
CR-23

70A 70A
AVS 8.0W
8R
8R
8R
8R

CR-24
5W
5W
8W
8W

CN-45

1
B
A

1
2

45
74
85
87
30
87
30
2

39
1

1
2

CN-80

2
2
M
2
2
2
2

1
1
1
1

CN-74
RS-1

DO-1

RS-2

2
RP

RAIL
START RY.

1
aP

3
6
5
4
3
2
1
2
1
85
86

2
1
85
86
B

1
2
3
4
5
6
A

BATTERY
CN-63
CN-60
CN-96
CN-95

L
P
CD-18

1 3W/100Ù

3
Pre-heater
B+

PRESS

4
RESISTOR

60B

AIR-HEATER RY.

SENSOR

2
2

1
1

2
1
2
1
SENSOR SENSOR

2
1
EGR TEMP IM TEMP
5B

3~

INTAKE THROTTOLEEGR VALVE

CN-300B

CN-300C
CN-300A

1
TVS

U
ENG OIL PRESS

1 2 DPF DPF
ALT.

60A 60A 60A 60A

2
INJECTOR 4

INJECTOR 1

INJECTOR 3

INLET MID
MOTOR

INJECTOR 2
RESISTOR

MAXI 1 MAXI 1
TEMP TEMP
SENSOR
STARTER

SUPPLY PUMP

EGR PRESS SENSOR DPF PRESS

EXT.TEMP
EARTH 1

YANMAR SIDE (gray) (black)

20MQ-98204
MEMORANDUM

4-44
4-42
1. POWER CIRCUIT
The negative terminal of battery is grounded to the machine chassis.
When the start switch is in the OFF position, the current flows from the positive battery terminal as
shown below.
1) OPERATING FLOW
Battery Master switch [CS-73 (L)] Fusible link (CN-63) Start relay [CR-23 (30)]
Air heater relay [CR-24 (30)]
Fusible link (CN-96) Power ralay [CR-01 (30)]
Fusible link (CN-96) Power ralay [CR-02 (30)]
Fusible link (CN-60) I/conn [CN-15 (1)]
Fuse box [No.2] Start switch [CS-2 (1)]
Iginition relay [CR-35 (30)]
ECU relay [CR-45 (30)]
Fuse box [No.1] Radio & USB player [CN-27 (8)]
Fuse box [No.3] Cluster [CN-56 (1)]
RMS [CN-125A (1)]
Hour meter [CN-48 (1)]
Fuse box [No.4] I/conn [CN-11 (5)] AC & Heater controller (3)
Blower relay (2)
I/conn [CN-6 (7)] Room lamp [CL-1 (2)]
Fuse box [No.5] I/conn [CN-04 (25)] MCU [CN-51 (B12)]
Fuse box [No.6] I/conn [CN-04 (8, 9)] ECU [CN-93A (1, 3, 5)]
EGR valve relay [CR-80 (30)]
※ I/conn : Intermediate connector

2) CHECK POINT
Engine Start switch Check point Voltage
① - GND (battery)
STOP OFF ② - GND (master switch) 10~12.5V
③ - GND (fusible link)
※ GND : Ground

4-45
POWER CIRCUIT
8.0W
5.0W
8.0W
2.0 Or

CN-36
10

33
17

19
16

18

21
13

14

15

20

22

23

24

25

26

27

28

29

30

31

32
11

12
8
6

9
4

5
1

40A
20A
10A

40A
20A

10A

10A

10A

20A

20A

20A

20A

20A

20A

20A

20A
10A

20A

10A

20A

20A
20A
20A
20A

20A
20A

20A
10A

20A

10A

10A

10A
20A
ROOM LAM&AC HEATER

12V OUTLET

EPPR POWER

CIGAR

HORN

SOLENOID 3

SPARE

SPARE
ALT,START

SAFETY SOL
SOLENOID 2

BEACON LAMP
WIPER

AC HEATER
ECU

MCU

HEAD LAMP

WORK LAMP

SOLENOID 1

FEED PUMP
MCU

CASSETTE,SW PANEL
CLUSTER
CASSETTE

START KEY

CABIN LAMP

PRE-HEAT

HEAT-SEAT
FUEL FILLER PUMP
CLUSTER

SPARE

SPARE

SPARE
FUSE BOX

POWER RELAY CR-23

0.75W

2.0V

1.0Y

2.0RW

1.0BW

AVS 3.0R
87 30 86

86

85

86

85
5R

70A
CR-45 30

30

87

30

87
86 30 87a 0.75B
86

CR-02
CR-01
85 70A 70A
87
0.75Or 85 87 85

87

87
85

85
30

30
86

86
0.75BrW
85 87 87a
86
1.0V
START RY
30

0.75BrW

0.75BrW
ECU IGNITION CR-24

0.75B

8.0W
8.0W

0.75B
8.0R
8.0R
5W 30 86
CR-35 87
5R

70A
86 30 87a 30
85
0.75B
1.0RW 86
87
86
0.75BrW 85 87 85
85 87 87a 1.0V
30 AIR-HEATER RY
IGNITION
CN-80
0.75BrW

CN-04 5W
1RW
1
1RW Pre-heater
0.75BrW
2 CN-95
CN-13
8.0W 8.0W 8.0W
1 1

60A
8.0R 8.0R 8.0W

MAXI 1
2 2

CN-96
CN-15 8.0R
5.0W 5.0W 1

60A
1 CN-07 8.0R
1.0RW 1RW 2
5
1.0Or 1.0Or
6 CN-60
BLOWER
RELAY BLOWER 5.0W
EM'CY STOP SW 1

60A
5.0W
T

MAXI 1
2
M

6
3
1

5
4

CN-63
5

8.0R
1
2

4
4
2

1.0RW

1
6

60A
5.0R
3

2
1

4
2
3

1.0Or CN-11
2

3 2
3

1 MASTER SW BATTERY
CS-33 2
15R L 60R 60B
3
4 5B
1.0RW
5 S
CS-73
BATT 3
3A
6
7 CN-45
1 EARTH 1

TAIL(+) 4 8 M
M START
AC & HEATER CONTROLLER
60R MOTOR
CR-80 B+
86 30 87a
0.75B CN-6
85
CN-14 1
87 8BW 2BW 0.75B
1 2
86
1.0R 3
1.0BW

85 87 87a
0.75G
0.75R
1.0R

30
4
EGR VALVE 5 CL-1
CN-04

CN-05

6 1
10
22
23
24
25

13
14
15
16
3
1

5
9

6
7
2

0.85R 0.75Lg
7 2
0.75RW

0.75G

8 ROOM LAMP
2.0R
1.0R
1.0Or
2.0R

2.0R

2.0R

CN-51 0.75RW

0.75Y

0.75Y
CN-93A

0.75W
0.75G

0.75G
0.75BrW

0.75Y
0.75BrW
86
87

89
88

1.0V
1
2
3
4
5
6

CN-48
CN-27
B12
B35

1
2
3
CS-2
1
2

7
8

5
4

1
6

2
3

SIG
BATTERY POWER

BATTERY POWER

(+)
(-)

B
HOUR METER

BATTERY 12V
SWITCH COM

0, I
1
POWER 12V

POWER 12V

POWER 12V

BACK UP+

H
MAIN_GND
MAIN_GND

MAIN_GND

IG POWER

CN-125A
ANT 12V

CN-56
ACC

ILL+

HOUR METER
ILL-
NC

I 0 H
4
3
NC

2
NC

NC

6
5

C ST ACC BR H

ECU MCU RADIO & USB PLAYER START SW RMS CLUSTER

85A4EL04

4-46
2. STARTING CIRCUIT
1) OPERATING FLOW
Battery (+) terminal Master switch [CS-73 (L)] Fusible link [CN-60]
I/conn [CN-15 (1)] Fuse box No.2 Start switch [CS-2 (1)]

(1) Start switch : ON

Start switch ON [CS-2 (2,3)] Ignition [CR-35 (86) → (87)] Fuse box [No.7,8,9]
I/conn [CN-04 (2)]
Power relay [CR-01 (86) → (87)] CN-13 [(2)] Fuse box [No.11~21]
Power relay [CR-02 (86) → (87)] CN-13 [(1)] Fuse box [No.22~32]

(2) Start switch : START

Start switch START [CS-2 (6)] Limit start [CR-385 (30) → (87)] I/conn [CN-04 (31)]
ECU [CN-93A (35) → (28, 73)] I/conn [CN-08 (2, 3)] Anti-restart relay [CR-5 (30) → (87)]
I/conn [CN-08 (12)] Start relay [CR-23 (85) → (87)] Start motor [CN-45 (M)]
Starter operating

2) CHECK POINT
Engine Start switch Check point Voltage
① - GND (battery)
② - GND (start key)
③ - GND (master switch)
Operating Start 10~12.5V
④ - GND (starter B+)
⑤ - GND (starter M)
⑥ - GND (Fusible link)
※ GND : Ground

4-47
 STARTING CIRCUIT
8.0W
5.0W
8.0W
2.0 Or

CN-36
10

33
17

19
16

18

21
13

14

15

20

22

23

24

25

26

27

28

29

30

31

32
11

12
8
6

9
4

5
1

40A
20A
10A

40A
20A

10A

10A

10A

20A

20A

20A

20A

20A

20A

20A

20A
10A

20A

10A

20A

20A
20A
20A
20A

20A
20A

20A
10A

20A

10A

10A

10A
20A
ROOM LAM&AC HEATER

12V OUTLET

EPPR POWER

CIGAR

HORN

SOLENOID 3

SPARE

SPARE
ALT,START

SAFETY SOL
SOLENOID 2

BEACON LAMP
WIPER

AC HEATER
ECU

MCU

HEAD LAMP

WORK LAMP

SOLENOID 1

FEED PUMP
MCU

CASSETTE,SW PANEL
CLUSTER
CASSETTE

START KEY

CABIN LAMP

PRE-HEAT

HEAT-SEAT
FUEL FILLER PUMP
CLUSTER

SPARE

SPARE

SPARE
FUSE BOX

2.0V

CR-23
1.0BW

AVS 3.0R
1.0GW
5W 86
87 30
POWER RELAY 5R

70A
CR-45 30
0.75B

86

85

86

85
86 30 87a
86
85 0.75BW

30

87

30

87
0.75Or 85 87 85
87
0.75BrW

CR-02
CR-01
85 87 87a
86
1.0V
70A 70A START RY
30
87

87
85

85
30

30
86

86
ECU IGNITION CR-24
5W
0.75BrW

86

0.75BrW
87 30
CR-35 5R
0.75B

8.0W
8.0W

0.75B
8.0R
8.0R

70A
86 30 87a 30
85
0.75B
1.0RW 86
87
0.75BrW 85 87 85
86
85 87 87a 1.0V
30 AIR-HEATER RY
IGNITION
CN-80
0.75BrW

CN-04 5W
1RW
1
1RW Pre-heater
0.75BrW
2 CN-95
CN-13
8.0W 8.0W 8.0W
1 1

60A
8.0R 8.0R 8.0W

MAXI 1
2 2

CN-96
CN-15 8.0R
5.0W 5.0W 1

60A
1 CN-07 8.0R
1.0RW 1RW 2
5
1.0Or 1.0Or
6 CN-60
5.0W
EM'CY STOP SW 1

60A
5.0W
T

MAXI 1
2
6
5
4

CN-63
5

8.0R
4

1.0RW

1
6

60A
5.0R
3

2
1

1.0Or
2

6
1

3
3

MASTER SW BATTERY
CS-33
15R L 60R 60B
5B
S
CS-73
CN-45
1 EARTH 1

M
M START
60R MOTOR
B+
5 DO-1
1.0BW
0.75R

1.0GW
1.0R

741A 0.75Gr
2
105 0.75GW
1
CN-04

RS-2
4
19
31

24
25
3
1

8
9
2

741 0.75Gr
1 3W/100Ù
RESISTOR
M26A 0.75V
2
0.75GW

0.75RW

TVS
2.0R
1.0R

452 AVS 8.0W

B+
741 0.75Gr G
2 s
3~
CN-08 M26 0.75V
1 L
U
1.0G 0.75G P
2
0.5P 0.75P
3 CR-5 CN-74
ANTI-RESTART

0.75OrW 0.75P
9 87a 30 86
0.75P
85
0.75BW 0.75BW
0.75OrW

0.75BW
CN-51 0.75RW

12 87
0.75G

0.75V
1.0Or
2.0R

2.0R

2.0R

0.5P

0.75G
0.75BrW
1.0G

0.75BrW

86
1.0G

1.0V

2 1.0GW
30
87a 87 85
CN-93A

B12
28

35

88
73

LIMIT START RELAY A25

A26
1
2
3
4
5
6

CS-2

5
4

1
6

2
3

CR-385
BATTERY POWER
START RY COIL(+)
START RY COIL(-)
KEY. START SIG.

LIMIT START

B
87a 30 86
ALT LEVEL(AI)

0, I 0.75P
1

85
POWER 12V

POWER 12V

POWER 12V
MAIN_GND
MAIN_GND

MAIN_GND

IG POWER

1.0GR
87
0.75GW
I 0 H 86
4
3
2
6
5

C ST ACC BR H 1.0G 87a 87 85

30
ECU MCU START SW
85A4EL05

4-48
3. CHARGING CIRCUIT
When the starter is activated and the engine is started, the operator releases the start switch to the
ON position.
Charging current generated by operating alternator flows into the battery through the master switch
(CS-73).
The current also flows from alternator to each electrical component and controller through the fuse
box.
1) OPERATING FLOW
(1) Warning flow
Alternator [CN-74 (1)] MCU [CN-51 (A26)] Cluster warning lamp (via CAN interface)
(2) Charging flow
Alternator [CN-74 (B+)] Master switch [CS-73 (L)] Battery (+) terminal
Bettery charging

2) CHECK POINT
Engine Start switch Check point Voltage
① - GND (battery voltage)
② - GND (master switch)
Operating ON ③ - GND (alternator B+ terminal) 10~12.5V
④ - GND (alternator L terminal)
⑤ - GND (MCU)
※ GND : Ground

4-49
CHARGING CIRCUIT

8.0W
5.0W
8.0W
2.0 Or

CN-36
10

33
17

19
16

18

21
13

14

15

20

22

23

24

25

26

27

28

29

30

31

32
11

12
8
6

9
4

5
1

40A
20A
10A

40A
20A

10A

10A

10A

20A

20A

20A

20A

20A

20A

20A

20A
10A

20A

10A

20A

20A
20A
20A
20A

20A
20A

20A
10A

20A

10A

10A

10A
20A
ROOM LAM&AC HEATER

12V OUTLET

EPPR POWER

CIGAR

HORN

SOLENOID 3

SPARE

SPARE
ALT,START

SAFETY SOL
SOLENOID 2

BEACON LAMP
WIPER

AC HEATER
ECU

MCU

HEAD LAMP

WORK LAMP

SOLENOID 1

FEED PUMP
MCU

CASSETTE,SW PANEL
CLUSTER
CASSETTE

START KEY

CABIN LAMP

PRE-HEAT

HEAT-SEAT
FUEL FILLER PUMP
CLUSTER

SPARE

SPARE

SPARE
FUSE BOX

CR-23
2.0V

1.0BW

AVS 3.0R
1.0GW
5W 30 86
87
POWER RELAY 5R

70A
CR-45 30
0.75B

86

85

86

85
86 30 87a
86
85 0.75BW

30

87

30

87
0.75Or 85 87 85
87
0.75BrW

CR-02
CR-01
85 87 87a
86
1.0V
70A 70A START RY
30
87

87
85

85
30

30
86

86
ECU IGNITION CR-24
5W
0.75BrW
86

0.75BrW
87 30
CR-35 5R
0.75B

8.0W
8.0W

0.75B
8.0R
8.0R

70A
86 30 87a 30
85
0.75B
1.0RW 86
87
0.75BrW 85 87 85
86
85 87 87a 1.0V
30 AIR-HEATER RY
IGNITION
CN-80
0.75BrW

CN-04 5W
1RW
1
1RW Pre-heater
0.75BrW
2 CN-95
CN-13
8.0W 8.0W 8.0W
1 1

60A
8.0R 8.0R 8.0W

MAXI 1
2 2

CN-96
CN-15 8.0R
5.0W 5.0W 1

60A
1 CN-07 8.0R
1.0RW 1RW 2
5
1.0Or 1.0Or
6 CN-60
5.0W
EM'CY STOP SW 1

60A
5.0W
T

MAXI 1
2
6
5
4

CN-63
5

8.0R
4

1.0RW

1
6

5.0R 60A
3

2
1

1.0Or
2

2
3

MASTER SW BATTERY
CS-33
15R L 60R 60B
5B
S
CS-73
CN-45
1 EARTH 1

M
M STARTER
60R MOTOR
B+
DO-1
1.0BW
0.75R

1.0GW

741A 0.75Gr
1.0R

2
105 0.75GW
1
CN-04

RS-2
19
31

24
25

741 0.75Gr
3
1

8
9
2

1 3W/100Ù
RESISTOR
M26A 0.75V
2
0.75GW

0.75RW

TVS
2.0R
1.0R

452 AVS 8.0W

B+
741 0.75Gr G
2 s
M26 0.75V 3~
CN-08 1 L
U
1.0G 0.75G P
2
0.5P
3
0.75P 3 4 CR-5 CN-74
0.75OrW
ANTI-RESTART

0.75P
9 87a 30 86
0.75P
85
0.75BW 0.75BW
0.75OrW

5 0.75BW
CN-51 0.75RW

12 87
0.75G

0.75V
1.0Or
2.0R

2.0R

2.0R

0.5P

0.75G
0.75BrW
1.0G

0.75BrW

86
1.0G

1.0V

1.0GW 87a 87 85
30
CN-93A

B12
28

35

88
73

LIMIT START RELAY A25

A26
1
2
3
4
5
6

CS-2

5
4

1
6

2
3

CR-385
BATTERY POWER
START RY COIL(+)
START RY COIL(-)
KEY. START SIG.

LIMIT START

B
87a 30 86
ALT LEVEL(AI)

0, I 0.75P
1

85
POWER 12V

POWER 12V

POWER 12V
MAIN_GND
MAIN_GND

MAIN_GND

IG POWER

1.0GR
87
0.75GW
I 0 H 86
4
3
2
6
5

C ST ACC BR H 1.0G 87a 87 85

30
ECU MCU START SW
85A4EL06

4-50
4. ILLUMINATION AND WORK LAMP
LAMP CIRCUIT
1) OPERATING FLOW
Fuse box (No.12) Illumination [CR-13 (30,86)]
Front cab work lamp relay [CR-9 (30,86)]
Fuse box (No.13) Boom work lamp relay [CR-3 (30,86)]
Fuse box (No.7) Switch panel [CN-116 (10)]
(1) Illumination lamp switch ON
Illumination lamp switch ON [CN-116 (1)] Illumination lamp relay [CR-13 (85) → (87)]
l/conn [CN-04 (23)] I/conn [CN-06 (07)] Quick clamp switch ill lamp ON [CS-67 (8)]
Aux & angle dozer sw ill lamp ON [CS-133 (8)]
ECO mode sw ill lamp ON [CS-80 (10)]
Radio & USB player illumination lamp ON [CN-27 (9)]
I/conn [CN-11 (8)] AC/Heater controller illumination lamp ON
Overload switch illumination lamp ON [CS-50 (8)]
Wiper switch illumination lamp ON [CS-3 (8)]
Washer switch illumination lamp ON [CS-30 (8)]
Cigar lighter [CL-2 (1)]
Accel dial lamp [CN-142A (2)]
(2) Work lamp switch ON
Work light switch ON [CN-116 (2)] Work lamp relay [CR-3 (85) → (87)] l/conn [CN-05 (1)]
l/conn [CN-12 (2)] Boom work lamp ON [CL-5 (2), 6 (2)]
2) CHECK POINT
Engine Start switch Check point Voltage
① - GND (fuse box)
② - GND (switch power input)
③ - GND (switch power output)
④ - GND (illumination lamp)
STOP ON 10~12.5V
⑤ - GND (fuse box)
⑥ - GND (switch power input)
⑦- GND (switch power output)
⑧ - GND (work light)
※ GND : Ground

4-51
 ILLUMINATION AND WORK LAMP CIRCUIT

CN-36
10

33
17

19
16

18

21
13

14

15

20

22

23

24

25

26

27

28

29

30

31

32
11

12
8
6

9
4

5
1

40A
20A
10A

20A

10A

10A

10A

20A

40A
20A

20A

20A

20A

20A

20A

20A
10A

20A

10A

20A

20A
20A
20A
20A

20A
20A

20A
10A

20A

10A

10A

10A
20A
ROOM LAM&AC HEATER

12V OUTLET

EPPR POWER

CIGAR

HORN

SOLENOID 3

SPARE

SPARE
ALT,START

SAFETY SOL
SOLENOID 2

BEACON LAMP
WIPER

AC HEATER
ECU

MCU

HEAD LAMP

WORK LAMP

SOLENOID 1

FEED PUMP
MCU

CASSETTE,SW PANEL
CLUSTER
CASSETTE

START KEY

CABIN LAMP

PRE-HEAT

HEAT-SEAT
FUEL FILLER PUMP
CLUSTER

SPARE

SPARE

SPARE
FUSE BOX

0.75Or

1.0R

1.0YW
5
1 SWITCH PANEL
12 NC
CN-11
11 GND
1 0.75Or
10 POWER IG 12V
2
9 BREAKER
3
8 TRAVEL ALARM
4
5 6 7 CABIN LIGHT OUT
6 BEACON
6
7
1.0RW
2 5 NC
NC
4
TAIL(+) 4 8
3 NC
AC & HEATER 0.75V
2 WORK LIGHT OUT
CONTROLLER 0.75B
1 ILLUMINATION LAMPOUT
CN-116

BOOM
7 WORK LAMP RY
87a
0.75V 30 86
85
1.0Br
87
1.0YW
86
CIGAR LIGHTER 1.0YW 87a 87 85
CN-14 30
2.0BW 8.0BW
3 1 CR-3
2
1.0/2.0RW
3 ILL LAMP RY
1
87a
0.75B 30 86
CL-2 0.75RW
85
87
1.0R
86
1.0R 87a 87 85
30
0.5BW CR-13
1
0.5RW
2
CN-05
1.0Br 1.0Br
1
2
3 CN-04
4
1
5
2
6
3
CL-5 1.0B
CN-12 7
1.0B 1.0B 4
1 1 8
1.0RL 1.0Br 1.0Br 11
2 2 9 12
BOOM WORK LAMP 10 13 CS-67 QUICK CLAMP SW
1.0B 11 0.75RW
1 14 8 ILLUMINATION
1.0RL
2 8 12
13
21

CL-6 1.0RW
22
0.75RW
CN-06 0.75RW CS-113 AUX & A/DOZER SW
14 23 7 8 ILLUMINATION
15 24

0.75RW
CS-80 ECO MODE SW
8 ILLUMINATION

0.75RW
B46 ILLUMINATION
CN-93A ECM
0.75Or

0.75RW

0.75Or

CS-50 OVERLOAD SW
ANTENA POWER

0.5RW
8 ILLUMINATION
CN-157

CN-27
10
9

7
6
5
4
3
2
1
8

0.5RW CS-3 WIPER SW

8 ILLUMINATION
SPK FRT RH-
SPK FRT LH-

0.5RW CS-30 WASHER SW

BACK UP+

TEL MUTE
ANT 12V

8 ILLUMINATION
ACC
ILL+

ILL-
NC

NC

RADIO & USB PLAYER

85A4EL07

4-52
5. BEACON LAMP AND CAB LAMP CIRCUIT
1) OPERATING FLOW
Fuse box (No.12) Cab front work lamp relay [CR-9 (30, 86)]
Fuse box (No.20) Beacon lamp relay [CR-85 (30, 86)]
Fuse box (No.21) Cab rear work lamp relay [CR-44 (30, 86)]
Fuse box (No.7) Switch panel [CN-116 (10)]
(1) Beacon lamp switch ON
Beacon lamp switch ON [CN-116 (6)] Beacon lamp relay [CR-85 (85) → (87)] I/conn [CN-5 (5)]
Beacon lamp ON [CL-7]
(2) Cab lamp switch ON
Cab lamp switch ON [CN-116 (7)] Front lamp relay [CR-9 (85) → (87)] I/conn [CN-9 (12)]
I/conn [CL-03 (2)] Cab front lamp ON
[CL-02 (2), CL-04 (2)]
Cab rear lamp relay [CR-44 (85) → (87)] I/conn [CN-9 (8)]
Cab rear lamp ON [CL-09 (02)]
Cab lamp ON [CL-3 (2), 4 (2)]

2) CHECK POINT
Engine Start switch Check point Voltage
① - GND (fuse box)
② - GND (switch power input)
STOP ON 10~12.5V
③ - GND (switch power output)
④ - GND (beacon & cab lamp)
※ GND : Ground

4-53
BEACON AND CAB LAMP CIRCUIT

CN-36
10

33
17

19
16

18

21
13

14

15

20

22

23

24

25

26

27

28

29

30

31

32
11

12
8
6

9
4

5
1

40A
20A
10A

40A
20A

10A

10A

10A

20A

20A

20A

20A

20A

20A

20A

20A
10A

20A

10A

20A

20A
20A
20A
20A

20A
20A

20A
10A

20A

10A

10A

10A
20A
ROOM LAM&AC HEATER

12V OUTLET

EPPR POWER

CIGAR

HORN

SOLENOID 3

SPARE

SPARE
ALT,START

SAFETY SOL
SOLENOID 2

BEACON LAMP
WIPER

AC HEATER
ECU

MCU

HEAD LAMP

WORK LAMP

SOLENOID 1

FEED PUMP
MCU

CASSETTE,SW PANEL
CLUSTER
CASSETTE

START KEY

CABIN LAMP

PRE-HEAT

HEAT-SEAT
FUEL FILLER PUMP
CLUSTER

SPARE

SPARE

SPARE
FUSE BOX

0.75Or

1.0R

1.0R
1 1 1

CN-9
1

4 2
3
BEACON LAMP RY
87a
BEACON LAMP 4
0.75Br
85
30 86
0.75Or 0.75Or 1.0Or 1.0Or
5 87
M 0.75B 2.0B 2.0BW 1.0R
6 86
1.0R 87a 87 85
30
CL-7 7
1.0G 1.0G CR-85
8
9

CL-09 10
0.75G 11
2 0.75ROr 1.0/2.0RW
0.75B
1 12 CAB REAR LAMP RY
13 87a
0.75Or 30 86
CAB REAR LIGHT 14
1.0ROr
85

15 87
1.0R
86
16 10.R 87a 87 85

4 30
0.75ROr

CR-44

2
0.75B

SWITCH PANEL
12 NC
CL-03

11 GND
2 1 0.75Or
10 POWER IG 12V
1.0BW 9 BREAKER
2
1.0RW 8 TRAVEL ALARM
1 0.75Or
7 CABIN LIGHT OUT
1.0RW

1.0BW

CL-02 0.75Br
6 BEACON
1.0BW 5 NC
2
1.0RW
1 4 NC
CL-04 3 NC

CABIN FRONT LIGHT 3 2 WORK LIGHT OUT

1 HEAD LIGHT OUT
CN-116

CAB FRONT LAMP RY

87a
0.75Or 30 86
85
1.0ROr
87
1.0R
86
1.0R 87a 87 85
30

CR-9
85A4EL08

4-54
6. WIPER AND WASHER CIRCUIT
1) OPERATING FLOW
(1) Start switch ON
Fuse box (No.15) Wiper relay [CR-4 (86, 87)]
Int wiper relay [CR-6 (3)]
Wiper motor [CN-21 (3)]
I/conn [CN-04 (29)] Washer pump [CN-22 (2)]
(2) Wipe switch ON : 1st step (low speed)
Wiper switch ON [CS-3 (3)] Int wiper relay [CR-6 (4) → (2)] Wiper relay [CR-4 (85) → (30)]
Washer motor operating [CN-21 (4)]
(3) Wiper switch ON : 2nd step (washer)
Wiper switch ON [CS-3 (4)] Int wiper relay [CR-6 (1)] Washer switch [CS-30 (2)]
Wiper relay [CR-4 (85) → (87a)]
Wiper motor operating [CN-21 (1)]
Washer switch ON [CS-30 (2)] I/conn [CN-04 (11)] Washer pump operating [CN-22 (1)]
(4) Auto parking (when switch OFF)
Switch OFF Wiper motor [CN-21 (1)] Wiper switch [CS-3] Int wiper relay [CR-6 (4) → (2)]
Wiper relay [CR-4 (85) → (30)] Wiper motor [CN-21 (4)]
Wiper motor parking position by wiper motor controller

2) CHECK POINT
Engine Start switch Check point Voltage
① - GND (fuse box)
② - GND (switch power input)
STOP ON 10~12.5V
③ - GND (switch power output)
④ - GND (wiper motor)
※ GND : Ground

4-55
 85A4EL09
CN-36

WASHER PUMP
40A SPARE
33
40A SPARE

M
10

CN-22
20A SPARE
32

2
1
20A SPARE
31
20A SPARE

1.0OrW
30

1.0Gr
20A SOLENOID 3
29
20A HORN
28
20A CIGAR
27
20A EPPR POWER
26

1.0OrW
20A 12V OUTLET

1.0Gr
25
10A HEAT-SEAT

CN-04
24
10A PRE-HEAT

10
11
12
13
14
15
16
25
26
27
28
29
30
33
34
35
36
2
1

4
3

5
23
10A FEED PUMP

0.75G
22

1.0R
20A CABIN LAMP
21
20A BEACON LAMP
20
10A SAFETY SOL
19
20A ALT,START
18
1

20A SOLENOID 1
17
20A AC HEATER
16
20A WIPER 1.0R

4-56
15
20A FUEL FILLER PUMP
14
20A WORK LAMP
13
20A HEAD LAMP
12
20A SOLENOID 2
11
10A MCU
9
10A CLUSTER
8
10A CASSETTE,SW PANEL
7
20A ECU
WIPER AND WASHER CIRCUIT

6
10A MCU
5
20A ROOM LAM&AC HEATER
4
10A CLUSTER
3
20A START KEY
2
10A CASSETTE

3
1

0.75V
0.75B

0.75B
FUSE BOX

0.75Gr
2

1.0BW

0.5BW
0.75G
4
0.75Or
0.75Or

0.75Gr

1.0BW
0.75G
0.75V

0.75G
0.75R
0.5RW
1.0BW

0.5BW

1.0R
1.0R

1.0R
0.75B
0.75B

G
V

CS-30
WASHER SW

10
4

8
3

9
DO-1

1
2

5
6
INT. WIPER RELAY

WIPER RELAY

CN-21
CR-6
CS-3

CR-4

1
2
87a
10

87
86
30
85
4

8
9

1
3

1
2
3

7
1
2

5
6

3
4
2
WIPER SW

5
WIPER MOTOR
7-

B 3

E 2
Lo 4

Pf 1
85
86

87a 87
30

4
8
M
8+

10
1

4
3

6
 MONITORING CIRCUIT

CN-36
10

33
17

19
16

18

21
13

14

15

20

22

23

24

25

26

27

28

29

30

31

32
11

12
8
6

9
4

5
1

40A
20A
10A

40A
20A

10A

10A

10A

20A

20A

20A

20A

20A

20A

20A

20A
10A

20A

10A

20A

20A
20A
20A
20A

20A
20A

20A
10A

20A

10A

10A

10A
20A
ROOM LAM&AC HEATER

12V OUTLET

EPPR POWER

CIGAR

HORN

SOLENOID 3

SPARE

SPARE
ALT,START

SAFETY SOL
SOLENOID 2

BEACON LAMP
WIPER

AC HEATER
ECU

MCU

HEAD LAMP

WORK LAMP

SOLENOID 1

FEED PUMP
MCU

CASSETTE,SW PANEL
CLUSTER
CASSETTE

START KEY

CABIN LAMP

PRE-HEAT

HEAT-SEAT
FUEL FILLER PUMP
CLUSTER

SPARE

SPARE

SPARE
FUSE BOX

1.0Y

RL

CN-56A 0.75Gr
CAM_ 6.5V 1
CAM1 2
CAM2 3
CAM3 4 CN-05
GND 5 1
0.75G
NTSC + 6 2
0.75V
NTSC - 7 3
0.75B
CAM GND 8 4 CN-249
0.75G
CLUSTER 5 1 NTSC +
0.75V
HOUR METER 0.75G 0.75G 6 3 NTSC -
0.75G 0.75B
SIG 3 7 2 CAMERA GND
0.75Gr 0.75GrW 0.75GrW
H (-) 2 8 4 CAMERA 6.5V
0.75Y 0.75G 0.75G
(+) 1 9 5
0.75V 0.75V
10 6
CN-48
11
0.75B 0.75B CAMERA
12
CN-125A 13 CN-148
0.5L 0.5L
0.75Y 14 1 12V+
BATTERY POWER 1 0.5Y 0.5Y 0.5Y
0.75RL 15 2 CAN_H
KEY "IG" 2 0.5L
0.75Y 16 3 CAN_L
CAN (HIGH) 3
4 GND
RX232(1)-TX 4
5 CAN2_H
GND (SERIAL) 5
6 CAN2_L
RX232(2)-TX 6
RX232(2)-RX 7 SERVICE TOOL(SA-D)
CAN (SHIELD) 8
RX232(1)-RX 9
F/W DOWN 10
0.75L
CAN (LOW) 11
MAIN GND 12
RMS

FUEL SENDOR
0.75B
1
0.75YW
2
CD-2
AIR CLEANER SW
0.75B
Pa 0.75Or

CD-10

HYD OIL TEMP

0.75YR
C 2
0.75B
1
CD-1
0.75RL
0.75G

0.75YW
0.75R

0.75YR
0.75Y
0.75L
0.75Y

0.75Or
0.75B
0.75B

0.75G

0.75G
0.75R

0.75Y
0.75L
CN-51
CN-56
CN-126

A47
B47

B29

B18
B17

A48

A36

B35

A21
A20
1
2
3
4
5
6
7
8
3
4
1
2

HYD. TEMP SENSOR(AI)

RS232
AIR CLEANER SW(DI_

CONN.
J1939 CAN_Lo(2)C
J1939 CAN_Hi(2)
FUEL LEVEL(AI)
BATTERY 12V

HOUR METER
GND RES SIG

RS232-RX(1)
RS232-TX(1)
POWER_IG

MAIN GND
CAN LOW

AUX GND

GND_DIN
CAN HI

AUX_R
AUX_L

CLUSTER MCU
85A4EL10

4-57
 ELECTRIC CIRCUIT FOR HYDRAULIC

CN-36
10

33
17

19
16

18

21
13

14

15

20

22

23

24

25

26

27

28

29

30

31

32
11

12
8
6

9
4

5
1

40A
20A
10A

40A
20A

10A

10A

10A

20A

20A

20A

20A

20A

20A

20A

20A
10A

20A

10A

20A

20A
20A
20A
20A

20A
20A

20A
10A

20A

10A

10A

10A
20A
ROOM LAM&AC HEATER

12V OUTLET

EPPR POWER

CIGAR

HORN

SOLENOID 3

SPARE

SPARE
ALT,START

SAFETY SOL
SOLENOID 2

BEACON LAMP
WIPER

AC HEATER
ECU

MCU

HEAD LAMP

WORK LAMP

SOLENOID 1

FEED PUMP
MCU

CASSETTE,SW PANEL
CLUSTER

PRE-HEAT

HEAT-SEAT
CASSETTE

START KEY

CABIN LAMP
FUEL FILLER PUMP
CLUSTER

SPARE

SPARE

SPARE
FUSE BOX

CN-07 CS-4
1 1

1
2 2
3 3

SAFETY SW
SWITCH PANEL 4 4

2
ILLUMINATION OUT 5
1 CS-4A
6
WORK LIGHT PUT 2 1

1
7
NC 3 2
8
NC 4 3
16
4

2
NC 5 17
BEACON 6 CN-241
CABIN LIGHT OUT 7 CN-05 1

SW3
B
TRAVEL ARARM 8 1 2

RCV RH
BREAKER 9 1

SW2
B
POWER 12V(IG) 10
CN-06 2
12 1

SW1
GND 11

Gr
15 2
NC 12
C
CN-116 SIG
B RETURN
PROPORT
-IONAL
A
CR-68 5V

86 30 87a CD-11
SAFETY SOL

85 1 Pa
87 2
CN-4
86
85 87 87a 1 TRAVEL ALARM PS
30
2 CN-81
3
2
4
BUZZER 1
5
2 6 TRAVEL BZ
1 7 SAFETY SOL
8
CN-113 2
21
1
22
23 CN-68
24
25
QUICK COUPLER SOL
26 1
27 2
28 CN-140
29
30
TRAVEL SOL
33
2
34
35 1
36 CN-70

BREAKER SOL
2
1
CN-66

OVERLOAD
A SUPPLY
CN-14 B sig
1
C RETURN
CD-31
CN-93A

CN-51
A28
A33
B47
BREAKER OPERATING SW B34
A29
A05

A47

TRAVEL SPEED SOL(DO) A09

A08
B24
A16
B43
REGERATION INTERLOCK SW 86
87

BREAKER READY SOL

10V POWER OUTPUT
CS-67
CS-50

SAFETY LEVER SIG

10

10

BREAKER SWITCH

TRAVEL DI (ECHO)
4

8
3

9
1
2

5
6

8
3

9
1
2

5
6

OVERLOAD PS
7

7 2 5
GND_RES SIG
5

SWITCH COM

SAFETY SOL

GND_MAIN
GND_DIN

6
4

3 1 4
6

8
1
3

OVERLOAD SW QUICK COUPLER SW ECU MCU

85A4EL11

4-58
GROUP 4 ELECTRICAL COMPONENT SPECIFICATION

Part name Symbol Specification Check

侍 Check specific gravity

1.280 over : over charged
Battery 12V × 100Ah
1.280 ~ 1.250 : normal
1.250 below : recharging

侍#Check coil resistance

Rated load : 12V
1 Normal : about 12W
Battery relay 2 100A (continuity)
侍#Check contact
1000A (30 second)
CR-1
CR-1 Normal : ¥W

侍Check contact
H BR ACC ST C
5
6
2
3
4

H0 I

OFF : ¥W(for each terminal)

Start key 0, I 12V
1

B ON : 0W(for terminal 1-3 and 1-2)

CS-2
3
2

6
1

4
5

START : 0W(for terminal 1-5)

Pressure switch Pa 0.5 kgf/cm2 侍#Check resistance

(for engine oil) (N.C TYPE) Normal : 0W(CLOSE)

CD-18

1 C 侍 Check resistance
Hydraulic oil
0.5 kgf/cm 2 50˚C : 804W
temperature
2 (N.C TYPE) 80˚C : 310W
sensor
CD-1 100˚C : 180W

4-59
 Part name Symbol Specification Check

Pa Pressure:
Air cleaner 侍 Check contact
635mmH2O
pressure switch Normal : ¥W
(N.O TYPE)
CD-10

侍 Check resistance
2
Full : 100W
Fuel sender -
1 Low : 500W
Empty warning :700W
CD-2

87a 30 86
85
侍 Check resistance
87
86
Normal : about 200W
Relay 30 87a 87 85 12V 20A (for terminal 85-86)
CR-2 CR-3 CR-4 CR-5 : 0W (for terminal 30-87a)
CR-7 CR-9 CR-12 CR-13 : ¥W (for terminal 30-87)
CR-36 CR-45 CR-62 CR-71
CR-80 CR-85

87 30 86

30
Relay 86 12V 70A 侍#Rated coil current 1.2±0.3A
85 87 85

CR-23 CR-24

2
侍 Check resistance
Solenoid valve 1 12V 1A Normal : 15~25W
(for terminal 1-2)
CN-66 CN-68
CN-70 CN-121
CN-140

侍Check resistance
Speaker 4W 20W
Normal : 4W
CN-23(LH)
CN-24(RH)

4-60
 Part name Symbol Specification Check

侍#Check contact
Boom swing Normal
12V 16A
switch OFF - ¥W (for terminal 1-5,2-6)
- 0W (for terminal 5-7,6-8)
CS-47

侍 Check contact
Quick clamp Normal
12V 16A
switch OFF - ¥W (for terminal 1-5,2-6)
- 0W (for terminal 5-7,6-8)
CS-67

2
Work, cab 12V 65W 侍#Check disconnection
lamp 1 (H3 TYPE) Normal : 1.2W

CL-5 CL-6 CL-9 CL-10

1
侍#Check disconnection
Room lamp 2 12V 10W
Normal : a few W
CL-1

1 M
12V 20A 侍Check operation
Fuel filler pump
2 35 l/min Supply power (for terminal 1) : 12V
CN-145

Horn 2 12V 100±5dB

CN-25

4-61
 Part name Symbol Specification Check

1 侍Check contact
2
2 1 Normal : 0W(for terminal A-B)
Safety switch 3 Micro : ¥W(for terminal A-C)
4
4 3 Operating : ¥W(for terminal A-B)
: 0W(for terminal A-C)
CS-4

2 Pa 10bar 侍#Check contact

Pressure switch
1 (N.C type) Normal : 0.1W

CD-11 CD-12

M 12V 侍#Check disconnection

Beacon lamp
(Strobe type) Normal : a fewW

CL-7
12
6

I 0
侍Check contact
Wiper switch 12V 16A
11
8

9
4

3
7
10

Normal : ¥W
10
A
B

7
2

6
1

4
5

8
9

CS-3

M 2
侍Check contact
Washer pump 1 12V 3.8A
Normal : 3W(for terminal 1-2)
CN-22

侍Check coil resistance

3
Normal : about 1MW
2
Cigar lighter 12V 10A 1.4W 侍 Check contact
1
Normal : ¥W
CL-2
CL-2 Operating time : 5~15sec

4-62
 Part name Symbol Specification Check

4 Lo
M

4
侍Check contact
Wiper motor 3 B
12V 3A
3 Normal : 6W(for terminal 2-6)
1 Pf
2 2 E
1

CN-21

10
11
12
13
14
15
16
1
2
3
4
5
6
7

9
8

侍#Check voltage
Radio & REMOCON GND
SPK FRT RH+

SPK FRT LH+

24V 2A 20 ~ 25V
SPK FRT RH-
SPK FRT LH-

REMOCON+
BACK UP+
TEL MUTE

USB player
ANT 12V

(for terminal 1-3, 3-8)

GND

GND
ACC

ILL+
ILL-

NC

NC

CN-27

2 Pa
侍 Check contact
Receiver dryer 1 12V
Normal : 0W
CN-29

M B+
侍#Check contact
Starter 12V × 3kW
Normal : 0.1W
M
CN-45

B+
G
2 s 侍 Check contact
~3
Alternator 1 L 12V 100A Normal : 0W(for terminal B+-1)
U
P
Normal : 24 ~ 27.5V
CN-74

侍#Check contact
Travel buzzer 12V 0.5A
Normal : 5.2W
CN-81

4-63
 Part name Symbol Specification Check

Compressor 12V 79W -

CN-28

Blower 1 M 侍#Check resistance

12V 9.5A
fan motor 2 2.5W(for terminal 1-2)

CN-83

M
Fuel feed pump 12V -

CN-61

Master switch 12V 1000A -

Preheater 12V 42A 500W -

CN-80

2
12V socket 12V 120W -
1

CN-139

4-64
 Part name Symbol Specification Check

侍 Check resistance
Normal : 0W
1˚C OFF
Duct sensor (for terminal 1-2)
4˚C ON
the atmosphere temp :
over 4˚C

侍#Check resistance
Normal : about 5kW
A + (for terminal A-C)
B S 侍#Check voltage
Accel dial -
C - Normal : about 5V
(for terminal A-C)
CN-142
: 2~4.5V
(for terminal C-B)

6
4

Int wiper relay 12V 12A -

3
1
CR-6

2 12V, 30A (CN-65)

Fusible link -
1 12V, 60A (CN-95)
CN-60 CN-95

4-65
GROUP 5 CONNECTORS

1. CONNECTOR DESTINATION

Connector No. of Connector part No.

Type Destination
number pin Female Male
CN-4 AMP 15 Cab room harness - Main harness - 1743062-2
CN-5 AMP 16 Cab room harness - Main harness - 368050-1
CN-6 - 15 Cab harness - Cab room lamp harness 2-85262-1 368301-1
CN-7 AMP 16 Main harness - Console harness 368047-1 368050-1
CN-8 AMP 15 Main harness - Cab harness - 308301-1
CN-11 - 8 Air-con DT06-8S-EP06 -
CN-12 DEUTSCH 2 Boom lamp DT06-2S-EP06 -
CN-13 KET 2 Power connector MG610557-5 -
CN-14 KET 2 Earth connector MG620558-5 -
CN-15 KET 1 Power connector MG640944-5 -
CN-16 AMP 6 Emergency throttle - 174264-2
CN-16B AMP 6 Emergency throttle S816-006002 -
CN-22 KET 2 Washer tank MG640605 -
CN-25 DEUTSCH 2 Horn DT06-2S-EP06 -
CN-27 - 16 Cassette radio PK145-16017 -
CN-28 AMP 1 Air conditioner compressor S810-001202 -
CN-29 KET 2 Receiver dryer MG640795 -
CN-36 - - Fuse box 21MN-55100 -
CN-51 MOLEX 48 MCU 64320-3319 -
CN-52 MOLEX 48 MCU 64320-3311 -
CN-56 AMP 8 Cluster - S816-108202
CN-56A - 8 Cluster 174982 -
CN-61 DEUTSCH 2 Fuel filler pump DT06-2S-EP06 -
CN-62 MTA - Master switch 03-210000 -
CN-62A DEUTSCH 2 Pattern change solenoid - Cab harness DT06-2S-EP06 DT04-2P- E005
CN-62B DEUTSCH 2 Pattern change solenoid - Cab harness DT06-2S-EP06 DT04-2P- E005
CN-63 MTA - Master switch 03-210000 -
CN-66R DEUTSCH 2 Breaker ready solenoid DT06-2S-EP06 -
CN-68 DEUTSCH 2 A1 safety solenoid DT06-2S-EP06 -
CN-70 DEUTSCH 2 A2 Travel solenoid DT06-2S-EP06 -
CN-74 KET 2 Alternator MG640188-5 -
CN-80 YAZAKI 1 Pre heater 7323-3010 -
CN-81 DEUTSCH 2 Buzzer DT06-2S-EP06 -
CN-93A AMP 94 ECU case 3-1355136-3 -
CN-93B AMP 60 ECU case 1897635-2 -
CN-95 MTA - Fuse holder 03-210000 -

4-66
Connector No. of Connector part No.
Type Destination
number pin Female Male
CN-96 MTA - Fuse holder 03-210000 -
CN-113 - 2 Buzzer S810-002202 -
CN-116 - 12 Switch panel 368542-1 -
CN-125A - 12 RMS DT06-126-P021 -
CN-126 DEUTSCH 4 RS-232 connector DT06-4S-EP06 -
CN-139 - 2 Dozer socket S810-002202 -
CN-140 DEUTSCH 2 Quick coupler solenoid DT06-2S-ER06 DT04 -2P-E005
CN-142 - 6 Accel dial DT06-8S-EP06 -
CN-145 YAZAKI 2 Fuel feed pump 7123-6423-30 -
CN-148 DEUTSCH 6 Service tool DT06-6S-E008 -
CN-170 - 2 Seat heat switch 12052641 -
CN-240C - 3 LH joystick DT06-3S -
CN-241A - 2 Breaker switch - DT04-2P
CN-241B - 3 Clamp release switch DT06-3S -
CN-241C - 2 Quick coupler switch - DT06-2S
CN-249 DEUTSCH 6 Rear camera DT06-6S DT04-6P
CN-300A AMP 6 DPF pressure 1438153-5 -
CN-300B FCI 2 DPF mid temperature 54200206 -
CN-300C FCI 2 DPF inlet temperature 54200208 -
CN-301 AMP 8 EGR sensor 776532-1 -
CN-302 AMP 12 EGR sensor 776533-1 -
CN-303 AMP 12 EGR valve 776533-2 -
CN-304 AMP 12 Cab rail 776533-3 -
CN-310 DEUTSCH 2 Release or breaker DT06-2S-EP06 -
CN-311 DEUTSCH 2 Clamp DT06-2S-EP06 -
CN-312 DEUTSCH 2 Rotating DT06-2S-EP06 -
CN-313 DEUTSCH 2 Rotating DT06-2S-EP06 -
CN-427 MOLEX 4 Smart reader 39012040 -
CN-437 DEUTSCH 2 Float solenoid DT06-2S-EP06 -
CN-438 DEUTSCH 2 Angle dozer sele ct solenoid DT06-2S-EP06 DT04-2P-E005
CN-439 DEUTSCH 2 AC mode solenoid DT06-2S-EP06 -
CN-442A - 3 Angle dozer switch - DT04-3P
CN-442B - 2 Dozer float switch DT06-2S -
CN-442C - 2 2 speed switch DT04-2P -
·LAMP
CL-1 - 2 Room lamp MG610392 -
CL-2 - - Ci
CL-3 - 2 Cab lamp DT06-2S-EP06 -
CL-5 - 2 LH work lamp DT06-2S-EP06 -

4-67
Connector No. of Connector part No.
Type Destination
number pin Female Male

CL-6 - 2 RH work lamp DT06-2S-EP06 -

CL-7 - 2 Beacon lamp DT06-2S-EP06 -
CL-9 - 2 Rear cab lamp DT06-2S-EP06 -
·RELAY
CR-1 KET 4 Power relay MG612017-5 -
CR-2 KET 4 Power relay MG612017-5 -
CR-23 KET 4 Power relay MG612017-5 -
CR-24 KET 4 Power relay MG612017-5 -
·SENDER
CD-1 AMP 2 Hydraulic temp sender 85202-1 -
CD-2 DEUTSCH 2 Fuel sender DT06-2S-EP06 -
CD-7 DEUTSCH 3 Load sensing pressure DT06-3S-EP006 -
CD-10 AMP 2 Air cleaner switch 85202-1 -
CD-11 KET 2 Travel alarm pressure MG640795 -
CD-18 YAZAKI 1 Engine oil pressure 7123-5014 -
CD-31 DEUTSCH 3 Overload pressure DT06-3S-EP006 -
CD-32 DEUTSCH 3 Boom up pressure DT06-3S-EP006 -
DO-1 AMP 2 Starter S816-002002 -
·SWITCH
CS-2 - 6 Start key S814-006000 -
CS-3 CARLING 10 Wiper motor VC2-01 -
CS-4 - 4 Safety switch 174257-2 -
CS-4A - 4 Safety switch 174259-2 -
CS-16 AMP 2 Fuel filler pump switch 174352-2 174354-2
CS-26A - 2 Foot pedal seat belt S816-002002 S816-102002
CS30 CARLING 10 Wiper masher VC2-01 -
CS-33 - 6 Emergency stop switch A816-006002 -
CS-50 - 10 Overload switch VC2-01 -
CS-67 CARLING 10 Quick coupler VC2-01 -
CS-76 CARLING 10 Pattern change VC2-01 -
CS-80 CARLING 10 ECO mode VC2-01 -
CS-100 CARLING 10 DPF switch VC2-01 -
CS-113 CARLING 2 AUX 174352-2 174354-2
CS-162 - 2 Foot pedal seat belt DT06-2S DT04-2P

4-68
2. CONNECTION TABLE FOR CONNECTORS
1) PA TYPE CONNECTOR
No. of
Receptacle connector (female) Plug connector (male)
pin

2 5 1 3

1 3 2 5

S811-005002 S811-105002

3 7 1 4

1 4 3 7

S811-007002 S811-107002

4 9 1 5

1 5 4 9

S811-009002 S811-109002

5 11 1 6

11

1 6 5 11

S811-011002 S811-111002

4-69
No. of
Receptacle connector (female) Plug connector (male)
pin

6 13 1 7

13

1 7 6 13
S811-013002 S811-113002

8 1 9
17

17

1 9 8 17
S811-017002 S811-117002
1 21
1 11

21

1 11 1 21
S811-021002 S811-121002

4-70
2) J TYPE CONNECTOR
No. of
Receptacle connector (female) Plug connector (male)
pin

1 21

2 12

S816-002001 S816-102001

2 3 1

3 1 2

S816-003001 S816-103001

3 1 4 2

4 2 3 1

S816-004001 S816-104001

8 5 2
6 3 1

8 5 2 6 3 1
S816-008001 S816-108001

4-71
3) SWP TYPE CONNECTOR
No. of
Receptacle connector (female) Plug connector (male)
pin

1 1

S814-001000 S814-101000

2 1

1 2

S814-002000 S814-102000

3 1

2 1 23

S814-003000 S814-103000

2 4
1 3

1 3 2 4

S814-004000 S814-104000

4-72
No. of
Receptacle connector (female) Plug connector (male)
pin
3 6
1 4

1 4 3 6

S814-006000 S814-106000
4 8
1 5

1 5 4 8
S814-008000 S814-108000
4 12 1 9

12

1 9 4 12

S814-012000 S814-112000
1 11
3 14

14

3 14
1 11

S814-014000 S814-114000

4-73
4) CN TYPE CONNECTOR
No. of
Receptacle connector (female) Plug connector (male)
pin

1
1

S810-001202 S810-101202

2 2

1 1

S810-002202 S810-102202

3 2

1 2 1 3

S810-003202 S810-103202

2 4
1 3

1 3
2 4
S810-004202 S810-104202

4-74
No. of
Receptacle connector (female) Plug connector (male)
pin

3 6 1 4

1 4 3 6
S810-006202 S810-106202

4 8 1 5

1 5
4 8
S810-008202 S810-108202

4-75
5) 375 FASTEN TYPE CONNECTOR
No. of
Receptacle connector (female) Plug connector (male)
pin

1 2 1 2

S810-002402 S810-102402

6) AMP ECONOSEAL CONNECTOR

No. of
Receptacle connector (female) Plug connector (male)
pin

1
12

1 13
24
36
36
13 25 12
24
25
36
344111-1 344108-1

7) AMP TIMER CONNECTOR

No. of
Receptacle connector (female) Plug connector (male)
pin

85202-1

4-76
8) AMP 040 MULTILOCK CONNECTOR
No. of
Receptacle connector (female) Plug connector (male)
pin

12 1 6

7 12
174045-2

9) AMP 070 MULTILOCK CONNECTOR

No. of
Receptacle connector (female) Plug connector (male)
pin

1 6
14

7 14

173852

10) AMP FASTIN - FASTON CONNECTOR

No. of
Receptacle connector (female) Plug connector (male)
pin

3 1

6
6 4
1
4 6 3

925276-0 480003-9

4-77
11) KET 090 CONNECTOR
No. of
Receptacle connector (female) Plug connector (male)
pin

6 1

MG610070

12) KET 090 WP CONNECTORS

No. of
Receptacle connector (female) Plug connector (male)
pin

1
2

MG640605

2 1

MG640795

4-78
13) KET SDL CONNECTOR
No. of
Receptacle connector (female) Plug connector (male)
pin

1
14
7

14 6

MG610406

4-79
 14) DEUTSCH DT CONNECTORS
DT 06 - 3S - 侏侏侏侏

### Modifications (see below)

Number of contacts (P : Pin, S : Socket)
04 : Receptacle, 06 : Plug
Deutsch connectors
侍 Modification
E003 : Standard end cap - gray
E004 : Color of connector to be black
E005 : Combination - E004 & E003
EP04 : End cap
EP06 : Combination P012 & EP04
P012 : Front seal enhancement - connectors color to black for 2, 3, 4 & 6pin

No. of
Receptacle connector (female) Plug connector (male)
pin

1 2 2 1
2

DT06-2S DT06-2P

2 1 1 2

3 3

DT06-3S DT06-3P

4 1 1 4

3 2 2 3

DT06-4S DT06-4P

4-80
No. of
Receptacle connector (female) Plug connector (male)
pin

6 1 1 6

4 3 3 4

DT06-6S DT06-6P

4 5 5 4

1 8 8 1

DT06-8S DT06-8P

6 7 7 6

12

1 12 12 1

DT06-12S DT06-12P

4-81
15) MOLEX 2CKTS CONNECTOR
No. of
Receptacle connector (female) Plug connector (male)
pin

1 2

35215-0200

16) ITT SWF CONNECTOR

No. of
Receptacle connector (female) Plug connector (male)
pin

2
10
1 10

SWF593757

17) MWP NMWP CONNECTOR

No. of
Receptacle connector (female) Plug connector (male)
pin

1
1

NMWP01F-B

4-82
GROUP 6 FAULT CODES
1. MACHINE FAULT CODE
Fault code
Description
HCESPN FMI
Hydraulic oil temperature sensor circuit - voltage above normal or shorted to high source (or
3
101 open circuit)
4 Hydraulic oil temperature sensor circuit - voltage below normal or shorted to low source
0 Working pressure sensor data above normal range (or open circuit)
1 Working pressure sensor data below normal range
105
2 Working pressure sensor data error
4 Working pressure sensor circuit - voltage below normal, or shorted to low source
0 Travel oil pressure sensor data above normal range (or open circuit)
1 Travel oil pressure sensor data below normal range
108
2 Travel oil pressure sensor data error
4 Travel oil pressure sensor circuit - voltage below normal or shorted to low source
0 Overload pressure sensor data above normal range (or open circuit)
1 Overload pressure sensor data below normal range
122
2 Overload pressure sensor data error
3 Overload pressure sensor circuit - voltage below normal or shorted to low source
3 Fuel level sensor circuit - voltage above normal or shorted to high source (or open circuit)
301
4 Fuel level sensor circuit - voltage below normal or shorted to low source
0 Brake pressure sensor data above normal range (or open circuit)
1 Brake pressure sensor data below normal range
503
2 Brake pressure sensor data error
4 Brake pressure sensor data - voltage below normal or shorted to low source
0 Working brake pressure sensor data above normal range (or open circuit)
1 Working brake pressure sensor data below normal range
505
2 Working brake pressure sensor data error
4 Working brake pressure sensor circuit - voltage below normal, or shorted to low source
0 Travel fwd pilot pressure sensor data above normal range (or open circuit)
1 Travel fwd pilot pressure sensor data below normal range
2 Travel fwd pilot pressure sensor data error
530
4 Travel fwd pilot pressure sensor circuit - voltage below normal, or shorted to low source
14 Travel fwd pilot pressure sensor circuit - special instructions
16 Travel fwd pilot pressure sensor circuit - voltage valid but above normal operational range
701 4 Hour meter circuit - voltage below normal, or shorted to low source
0 MCU input voltage high
705
1 MCU input voltage low
707 1 Alternator node I voltage low (or open circuit)
3 Acc. dial circuit - voltage above normal, or shorted to high source (or open circuit)
714
4 Acc. dial circuit - voltage below normal, or shorted to low source
840 2 Cluster communication data error
841 2 ECM communication data error

4-83
2. ENGINE FAULT CODE
Fault code Description
YANMAR SPN FMI Area Status
2 Crankshaft signal error
522400 Crankshaft speed sensor
5 No signal from crankshaft
2 Camshaft signal error
522401 5 Camshaft speed sensor No signal from camshaft
7 Angle offset error
Crankshaft speed sensor, Crankshaft/camshaft, speed sensor non-input
523249 5
Camshaft speed sensor (simultaneous)
3 Accelerator sensor 1 error (voltage high)
91 Accelerator sensor 1
4 Accelerator sensor 1 error (voltage low)
3 Accelerator sensor 2 error (voltage high)
28 Accelerator sensor 2
4 Accelerator sensor 2 error (voltage low)
522624 7 Dual accelerator sensor error (closed position)
Accelerator sensor 1 + 2
522623 7 Dual accelerator sensor error (open position)
3 Accelerator sensor 3 error (voltage high)
Accelerator sensor 3
29 4 Accelerator sensor 3 error (voltage low)
8 Pulse sensor Pulse accelerator sensor error (pulse communication)
0 Accelerator sensor 3 error (foot pedal in open position)
28 Accelerator sensor 3
1 Accelerator sensor 3 error (foot pedal in closed position)
3 Intake throttle position sensor error (voltage high)
51 Intake throttle position sensor
4 Intake throttle position sensor error (voltage low)
ERG low pressure side pressure sensor error (excessive
3
sensor output)
ERG low pressure side pressure sensor error (insufficient
4
EGR low pressure side pressure sensor output)
102
sensor ERG low pressure side pressure sensor error (abnormal
13
learning value)
ERG low pressure side pressure sensor error (detected
10
value error)
ERG high pressure side pressure sensor error (excessive
3
sensor output)
ERG high pressure side pressure sensor error (insufficient
4
EGR pressure sensor sensor output)
1209
(high-pressure side) ERG high pressure side pressure sensor error (abnormal
13
learning value)
ERG high pressure side pressure sensor error (detected
10
value error)
Engine coolant temperature sensor error (excessive
3
sensor output)
Engine coolant temperature sensor error (insufficient
4 Engine coolant temperature sensor output)
110
sensor Engine coolant temperature sensor error (detected value
10
error)
0 Engine coolant temperature high (overheat)
3 Ambient air temperature sensor error (voltage high)
172 Ambient air temperature sensor
4 Ambient air temperature sensor error (voltage low)

4-84
 Fault code Description
YANMAR SPN FMI Area Status
3 Fuel temperature sensor error (voltage high)
174 4 Fuel temperature sensor Fuel temperature sensor error (voltage low)
0 Fuel temperature high
3 Rail pressure sensor error (voltage high)
157 Rail pressure sensor
4 Rail pressure sensor error (voltage low)
DPF differential pressure sensor error (excessive sensor
3
output)
DPF differential pressure sensor abnormal rise in
4
differential pressure
3251 DPF differential pressure sensor
DPF differential pressure sensor error abnormal rise in
0
differential pressure
DPF differential pressure sensor error (abnormal learning
13
value)
DPF substrate/DPF differential pressure sensor error
DPF substrate/DPF differential
4795 31 (DPF substrate removal/DPF differential pressure sensor
pressure sensor
detected value error)
DPF high pressure side pressure sensor error (excessive
3
sensor output)
DPF high pressure side pressure DPF high pressure side pressure sensor error (insufficient
3609 4
sensor sensor output)
DPF high pressure side pressure sensor error (detected
10
value error)
DPF inlet temperature sensor error (excessive sensor
3
output)
DPF inlet temperature sensor error (insufficient sensor
4 DPF intermediated temperature
3242 output)
sensor
10 DPF inlet temperature sensor error (detected value error)
DPF inlet temperature sensor abnormal temperature
0
(abnormally high)
3 DPF intermediate temperature sensor error (excessive
DPF intermediate temperature sensor error (insufficient
4
DPF intermediate temperature sensor output)
3250 DPF intermediate temperature sensor error (detected
10 sensor
value error)
DPF intermediate temperature sensor abnormal
1
temperature (abnormally low)
Atmospheric pressure sensor error (excessive sensor
3
output)
108 Atmospheric pressure sensor Atmospheric pressure sensor error (insufficient sensor
4
output)
10 Atmospheric pressure sensor error (characteristic error)
Exhaust manifold temperature sensor error (excessive
3
sensor output)
Exhaust manifold temperature Exhaust manifold temperature sensor error (insufficient
173 4
sensor sensor output)
Exhaust manifold temperature sensor error (detected
10
value error)
7 Main relay contact sticking
1485 Main relay
2 Main relay early opening

4-85
 Fault code Description
YANMAR SPN FMI Area Status
5 Starting aid relay disconnection
522243 Starting aid relay
6 Starting aid relay relay GND short circuit
5 Disconnection (injector-specific)
654 6 Injector (No.1 cylinder) Coil short circuit
3 Short circuit
5 Disconnection (injector-specific)
653 6 Injector (No.2 cylinder) Coil short circuit
3 Short circuit
5 Disconnection (injector-specific)
652 11 Injector (No.3 cylinder) Coil short circuit
3 Short circuit
5 Disconnection (injector-specific)
651 6 Injector (No.4 cylinder) Coil short circuit
3 Short circuit
4257 12 Injector drive IC error
Injector drive circuit (Bank1) shotrt circuit
2797 6 All injectors (4TN: common circuit for No.1, No4 and all 3TN
cylinders)
Injector drive circuit (Bank2) short circuit
2798 6
(4TN: circuit for No.2 and 3 cylinders)
523462 13 Inujector (No.1 cylinder) correction value error
523463 13 Inujector (No.2 cylinder) correction value error
Injector (correction value)
523464 13 Inujector (No.3 cylinder) correction value error
522465 13 Inujector (No.4 cylinder) correction value error
3 SCV (MPROP) L side VB short circuit
522571
6 SCV (MPROP) L side GND short circuit
3 SCV (MPROP) H side VB short circuit
633 6 SCV (MPROP) SCV (MPROP) H side GND short circuit
5 SCV (MPROP) disconnection
6 SCV (MPROP) drive current (high level)
522572
11 SCV (MPROP) pump overload error
0 Rail pressure too high
18 Rail pressure error Rail pressure deviation error (low rail pressure)
157
15 Rail pressure deviation errer (high rail pressure)
16 PLV open valve
523469 0 Rail pressure fault (The times of PLV valve opening error)
523470 0 PLV (common rail pressure limit Rail pressure fault (The time of PLV valve opening error)
valve) Rail pressure fault (The actual rail pressure is too high
523489 0
during PRV limp home)
Rail pressure fault (contrilled rail pressure error after PLV
523498 9
valve opening)
Rail pressure fault (injector B/F temperature error during
523491 0
PLV4 limp home)
Rail pressure control
Rail pressure fault (operation time error during RPS limp
523460 7
home)

4-86
 Fault code Description
YANMAR SPN FMI Area Status
190 16 Overspeed Overspeed
5 No-load of throttle valve drive H bridge circuit
3 Power short circuit of throttle valve drive H bridge output 1
2950
4 GND short circuit of throttle valve drive H bridge output 1
6 Overload on the drive H bridge circuit of throttle valve
Intake throttle drive circuit VB power short circuit of throttle valve drive H bridge
3
2951 output 2
4 GND short circuit of throttle valve drive H bridge output 1
2950 7 Throttle valve sticking (sticking open)
2951 7 Throttle valves sticking (sticking closed)
522596 9 TSC1 (SA1) reception timeout
522597 9 TSC1 (SA2) reception timeout
522599 9 Y_ECR1 reception timeout
522600 9 Y_EC reception timeout
522601 9 Y_RSS reception timeout
31 VI_ reception timeout
237 CAN 2
13 VI_ reception data error
522609 9 Y_ETCP1 reception timeout
522618 9 EBC1 reception timeout
522619 9 Y_DPFIF reception timeout
522730 12 Immobilzer error (CAN communication)
1202 2 Immobilizer error (system)
522610 9 CAN 1 (for EGR): reception timeout from the EGR valve
CAN 1
522611 9 CAN 1 (for exhaust throttle): receptiom timeout
0 EGR overvoltage error
1 EGR low voltage error
2791 7 EGR feedback error
9 EGR ECM data error
12 Disconnection in EGR motor coils
522579 12 Short circuit in EGR motor coils
EGR valve
522580 12 EGR position sensor error
522581 7 EGR valve sticking error
522183 7 EGR initialization error
522184 1 EGR high temperature thermistor error
522617 1 EGR low temperature thermistor error
522746 12 EGR target value out of range
522747 12 Exhaust throttle (voltage fault)
522748 12 Exhaust throttle (motor fault)
12 Exhaust throttle (sensor system fault)
522749 Exhaust throttle
12 Exhaust throttle (MPU fault)
522750 12 Exhaust throttle (PCB fault)
522751 19 Exhaust throttle (CAN fault)

4-87
 Fault code Description
YANMAR SPN FMI Area Status
630 12 EEPROM memory deletion error
522576 12 EEPROM EEPROM memory reading error
522578 12 EEPROM memory writing error
522585 12 CY 146 SPI communication fault
522588 12 Excessive voltage of supply 1
522589 12 Insufficient voltage of supply 1
522590 12 Sensor supply voltage error 1
522591 12 Sensor supply voltage error 2
522592 12 Sensor supply voltage error 3
522744 4 Actuator drive circuit 1 short to ground
522994 4 Actuator drive circuit 2 short to ground
523471 6 Actuator drive circuit 3 chort to ground
523473 12 AD converter fault 1
523474 12 AD converter fault 2
523475 12 External monitoring IC and CPU fault 1
523476 12 ECU internal fault External monitoring IC and CPU fault 2
523477 12 ROM fault
523478 12 Shutoff path fault 1
523479 12 Shutoff path fault 2
523480 12 Shutoff path fault 3
523481 12 Shutoff path fault 4
523482 12 Shutoff path fault 5
523483 12 Shutoff path fault 6
523484 12 Shutoff path fault 7
523485 12 Shutoff path fault 8
523486 12 Shutoff path fault 9
523487 12 Shutoff path fault 10
523488 0 Recognition error of engine speed
5 Breather heater disconnection
Breather heater (optional parts
3059 4 Breather heater short circuit (GND)
for 4TNV86CT and 4TNV98CT)
3 Breather heater short circuit (VB)
522323 0 Air cleaner switch Air cleaner clogged alarm
522329 0 Water weparator switch Water separator alarm
5 Charge switch disconnection
167 Charge switch
1 Charge alarm
4 Oil pressure switch disconnection
100 Oil pressure switch
1 Low oil pressure alarm
522573 0 Excessive PM accumulation (method C)
522574 0 Excessive PM accumulation (method P)
522575 7 DPF Regeneration falure (stationary regeneration failure)
Regeneration failure (staonary regeneration not
522577 11
performed)
DPF intermediate temperature DPF intermediate temperature sensor abnormal rise in
3250 0
sensor temperature (post-injection malfunction)

4-88
 Fault code Description
YANMAR SPN FMI Area Status
16 Ash cleaning request 1
3720
0 Ash cleaning request 2
16 Stationary regeneration standby
3719
0 DPF OP interface Backup mode
3695 14 Reset regeneration is inhibited
9 Regeneration faulure (recovery regeneration failure)
3719
7 Recovery regeneration is inhibited

4-89
 SECTION 5 TROUBLESHOOTING

Group 1 Before Troubleshooting --------------------------------------------------------------------------------- 5-1

Group 2 Hydraulic and Mechanical System -------------------------------------------------------------- 5-4
Group 3 Electrical System ------------------------------------------------------------------------------------------- 5-24
GROUP 1 BEFORE TROUBLESHOOTING

1. INTRODUCTION
When a trouble is occurred in the machine, this section will help an operator to maintain the machine
with easy.
The trouble of machine is parted Hydraulic & Mechanical system and Electrical system system.
At each system part, an operator can check the machine according to the troubleshooting process
diagram.

Hydraulic &
Mechanical part GROUP 2

Troubles occur

Electrical part GROUP 3

5-1
2. DIAGNOSING PROCEDURE
To carry out troubleshooting efficiently, the following steps must be observed.

STEP 1. Study the machine system

Study and know how the machine is operating,
how the system is composing, what kinds of
function are installed in the machine and what
are specifications of the system components by
the machine service manual.
Especially, deepen the knowledge for the
related parts of the trouble.
13031SH02

STEP 2. Ask the operator

Before inspecting, get the full stor y of
malfunctions from a witness --- the operator.
1) How the machine is used and when it is
serviced?
2) When the trouble was noticed and what
work the machine was doing at that time?
3) What is the phenomenon of the trouble?
Was the trouble getting worse, or did it
come out suddenly for the first time?
4) Did the machine have any troubles
previously? If so, which par ts were
13031SH03
repaired before.

STEP 3. Inspect the machine

Before starting troubleshooting, check the
machine for the daily maintenance points as
shown in the operator's manual.
And also check the electrical system including
batteries, as the troubles in the electrical system ON THE
INSPECTION
such as low battery voltage, loose connections
and blown out fuses will result in malfunction of
6-2(3) 140-7
the controllers causing total operational failures
of the machine.

5-2
STEP 4. Inspect the trouble actually on the
machine
In case that some trouble cannot be confirmed,
obtain the details of the malfunction from the
operator.
Also, check if there are any in complete
connections of the wire harnesses are or not.

6-3(1) 140-7

STEP 5. Perform troubleshooting

According to where the trouble parts are
located, hydraulic & mechanical system part or
electrical system part or mechatronics system
part, perform troubleshooting the machine refer
to the each system part's troubleshooting
process diagram.

13031SH05

STEP 6. Trace a cause

Before reaching a conclusion, check the most
suspectible causes again. Try to trace what the
real cause of the trouble is.

Make a plan of the appropriate repairing

procedure to avoid consequential malfunctions.

6-3(3) 140-7

5-3
GROUP 2 HYDRAULIC AND MECHANICAL SYSTEM

1. INTRODUCTION
1) MACHINE IN GENERAL
(1) If even a minor fault is left intact and operation is continued, a fatal failure may be caused,
entailing a large sum of expenses and long hours of restoration.
Therefore when even a small trouble occurs, do not rely on your intuition and experience, but look
for the cause based on the troubleshooting principle and perform maintenance and adjustment to
prevent major failure from occurring. Keep in mind that a fault results from a combination of
different causes.
(2) The following lists up commonly occurring faults and possible causes with this machine. For the
troubleshooting of the engine, refer to the coming troubleshooting and repair.
(3) When carrying out troubleshooting, do not hurry to disassemble the components.
It will become impossible to find the cause of the problem.
(4) Ask user or operator the following.
① Was there any strange thing about machine before failure occurred?
② Under what conditions did the failure occur?
③ Have any repairs been carried out before the failure?
(5) Check before troubleshooting.
① Check oil and fuel level.
② Check for any external leakage of oil from components.
③ Check for loose or damage of wiring and connections.

5-4
2. DRIVE SYSTEM
1) UNUSUAL NOISE COMES OUT OF PUMP CONNECTION

Cause Remedy
YES
Coupling element Disassemble
is broken. and repair.
Remove dust
plug under engine
flywheel and
YES
check if rubber Replace hub or
pieces or particles retighten
are not present. Coupling hub setscrew.
spline is worn or
NO hub fastening
setscrew is slack.
If hydraulic pump or engine is
suspected as a culprit refer to this
NO
manual "Structure and function".

5-5
 2) ENGINE STARTS BUT MACHINE DOES NOT OPERATE AT ALL

Cause Remedy
NO
Replenish
specified oil to
the standard
Is oil level in Abnormal noise level.
hydraulic oil YES comes out of YES
Hydraulic pump is Disassemble
tank within hydraulic pump
standard level? broken. and repair.
Do not hydraulic Abnormal noise
pump and pump YES comes out of YES
connections pump See item 1).
YES
make abnormal connection at page 5-5
noise?

Is primary pilot
pressure within ⓐ
NO standard level?

YES
Clean pilot
Is not pilot piping
clogged or is not piping interior or
YES
oil leakage repair piping.
present on pilot
piping?
NO Pilot valve is Disassemble
ⓐ faulty. and repair.
YES
Pilot relief valve is Repair or
Is gear pump faulty. replace.
NO delivering oil?

NO Gear pump is Disassemble

broken. and repair.

5-6
3. HYDRAULIC SYSTEM
1) HYDRAULIC OIL IS CLOUDY

Cause Remedy
YES
Water is mixed. Put hydraulic oil
still, separate
Drop hydraulic oil water and
sample on hot dispose it or
plate and check if replace hydraulic
foams come up. oil.

Air is intruded. Check suction

NO
line and return
line and eliminate
the air intruding
source.

2) HYDRAULIC OIL TEMPERATURE HAS RISEN ABNORMALLY

Cause Remedy
NO
Replenish
specified oil to
the standard
Is hydraulic oil
level.
volume proper? YES
Clean oil cooler.
Is not oil cooler Secure air
clogged and is circulation route.
YES anything blocking YES
ⓐ
air circulation?
Is fan belt
NO tension proper?
Adjust belt
NO
tension or
replace belt.
Is not the set YES
pressure of main Readjust set
relief, relief and pressure.
ⓐ
travel relief valve Is main relief
lower than the YES
valve used very Reduce load.
standard level? NO often?

5-7
 3) CAVITATION OCCURS WITH PUMP

Cause Remedy
NO
Replenish
specified oil to
the standard
Is hydraulic oil level.
volume proper? YES
Replace oil with
one of proper
Is not viscosity viscosity.
of hydraulic oil
YES YES
too high? Clean suction