WORKSHOP MANUAL

DUMPER

KC70
 CONTENTS

MECHANISM
1. SPECIFICATIONS
2. DIMENSIONS
3. ENGINE
4. TRANSMISSION
5. HYDRAULIC SYSTEM (DUMPING)
6. FUEL SYSTEM
7. V-BELT
8. WIRING DIAGRAM

SERVICING
1. TIGHTENING TORQUE
2. OILS
3. GREASING
4. CAUTION FOR DISASSEMBLING AND REASSEMBLING
5. ADJUSTMENT OF COMPONENT PARTS
6. REPLACEMENT OF WEAR OUT PARTS
7. TROUBLESHOOTING AND COUNTERMEASURES
8. MAINTENANCE INTERVALS

1
MECHANISM
1. SPECIFICATIONS
2. DIMENSIONS
3. ENGINE
4. TRANSMISSION
5. HYDRAULIC SYSTEM (DUMPING)
6. FUEL SYSTEM
7. V-BELT
8. WIRING DIAGRAM

2
1. SPECIFICATIONS
Model KC70
Machine weight (kg) 510
Max. loading capacity (kg) 700
Engine Model KUBOTA OC60-E3-D1-D-CRYM-1
Type Oil and air-cooled, 4cycle, diesel
No. of cylinder 1
Bore and Stroke (mm) 72 x 68
Total Displacement (cc) 276
Output (KW/rpm) 4.1/2900
Starting system Electric
Dimensions Length (mm) 2300
Width (mm) 880
Height (mm) 1960
Min. ground clearance (mm) 130
Track center-to-center distance (mm) 620
Bed Length (mm) 1250
Width (mm) 820
Height (mm) 350
Capacity ( Struck / Heaped ) ( ) 300 / 360
Undercarriage Crawler type Rubber track
Number of drive sprocket teeth 7
Crawler pitch (mm) 72
Track width (mm) 200
Number of track rollers 4 (one side)
Ground contact length (mm) 980
Gradeability (° ) 25
Alignment Screw type with spring
Ground contact pressure w/o load (kgf/cm2) 0.15
Ground contact pressure w/t load (kgf/cm ) 2 0.33
Max. traction power (kgf) 680
Transmission Type Gear shift type transmission
Travelling speed 1st (km/h) 0 - 1.4 / 0 - 1.3
(Forward / Reverse) 2nd (km/h) 0 - 2.7 / 0 - 2.6
3rd (km/h) 0 - 4.4 / 0 - 4.3
Main clutch Belt tension with Foot pedal or Hand lever
Steering clutch Tooth clutch
Steering brake Internal expanding type
Parking brake Internal expanding type
Dumping performance Dumping type Hydraulic
Dumping direction Front
Max. Dumping angle (° ) 68 (43)
Raising time (at 2900rpm) (sec) 6.4
Lowering time (at 2900rpm) (sec) 4.2
Capacity Fuel tank ( ) 8.5
Hydraulic oil tank ( ) 1.5
Engine oil ( ) 1.3
Transmission oil ( ) 1.9

3
4
2. DIMENSIONS
3. ENGINE
Model : OC60-E3-D1-D-CRYM-1 / Code No : 1G181-31000
See the WSM / DIESEL ENGINE OC60-E3
(Code No 9Y131-00690)

Specifications
Model OC60-E3(-X) OC60-E3(-X)-L OC95-E3(-X) OC95-E3(-X)-L
Number of Cylinders 1
Type Oil-cooled 4-cycle diesel engine
Bore×Stroke mm (in.) 72.0 x 68.0 (2.83 x 2.68) 83.0 x 77.0 (3.27 x 3.03)
Total Displacement cm (cu.in.)
3
276 (16.8) 416 (25.4)
ISO Net Continuous kW/min-1 (rpm) 4.2 / 3600 6.25 / 3600
(HP/min-1 (rpm)) (5.6 / 3600) (8.38 / 3600)
ISO/SAE Net Intermittent 4.5 / 3600 7.0 / 3600
kW/min-1 (rpm) (HP/min-1 (rpm)) (6.0 / 3600) (9.4 / 3600)
Maximum Bare Speed (min-1 (rpm)) 3800
Minimum Bare Idling Speed (min-1 (rpm)) 1300
Combustion System TVCS (Three-vortex combustion system)
Fuel Injection Pump ND type (DENSO)
Governor Centrifugal mechanical governor
Direction of Rotation Clockwise (View from flywheel side)
Injection Nozzle DN4PD82 (DENSO)
Injection Timing (Static) 0.28 rad (16°) 0.24 rad (14°)
before T.D.C. before T.D.C.
Injection Pressure 13.73 MPa (140,0 kgf/cm , 1991 psi)
2

Compression Ratio 24.5 : 1 24.0 : 1

Lubricating System Forced lubrication by trochoid pump
Oil Pressure Indicating Electrical Type Switch
Lubricating Filter Oil strainer
Cooling System Oil cooling + Air cooling
Starting System Electric starting with starter
Starting Motor 12V 0.7kW 12V 1.2kW
Starting Support Device By Glow Plug in Combustion Chamber
EGR None
Battery 12V, 27 AH equivalent 12V, 36 AH equivalent
Charging Alternator 12V, 48W 12V, 170W 12V, 48W 12V, 170W
Fuel Diesel Fuel No.2-D S500 or S15, see page G-5.
Fuel Tank Capacity 3.5L (0.92 U.S.gals) 5.5L (1.5 U.S.gals)
Lubricating Oil Class CF lubricating oil as per API classification is recommended.
For details on recommended lubricating oils, see page G-6.
Lubricating Oil Capacity 1.3L (1.4 U.S.qts) 1.7L (1.8 U.S.qts)
Weight (Dry) kg(lbs) 38.0 (83.8) 56.0 (123)
W10441170

5
Performance curves

OC60-E3 OC95-E3

kgf . m

kgf . m
N.m

N.m
23.6 2.4
(5) (5)
13.7 1.4 21.6 2.2
(1) (1) (1) (1)
11.8 1.2 19.6 2.0
9.8 1.0 17.6 1.8

kW

kW
7 5.2 10 7.4
(6)
6 (6) 4.4 9 6.7

5 3.7 8 5.9
(2) (7) (2) (7)
(2) (2)
4 3.0 7 5.2

3 2.2 6 4.4
HP

HP
5

295
220 295 220
282
(3) (8) 210 (3) 282 (8) 210
268 (3) (3)
200 268 200
g/kW . h

g/kW . h
g/HP . h

g/HP . h
255 190

18 20 22 24 26 28 30 32 34 36 18 20 22 24 26 28 30 32 34 36

(4) min-1(rpm) x 100 (4) min-1(rpm) x 100

Intermittent
3ECAAACEP001A Continuous

(1) Touque (3) Fuel Consumption (5) Net Intermittent Torque (7) Net Continuous B.H.P.
(2) Brake Horsepower (4) Engine Speed (6) Net Intermittent B.H.P. (8) Net Intermittent B.S.F.C.

Fuel consumption

Fuel consumption KC70

Fuel consumption(L/h)

Work load factor(%)

6
Dimension
• STANDARD TYPE [OC60-E3]

3ECAAACFP001A

STANDARD TYPE
A 133.5 mm (5.256 in.)
B 121 mm (4.76 in.)
C 164 mm (6.46 in.)
D 403.0 mm (15.87 in.)
E 3.0 mm (0.12 in.)
F 47.0 mm (1.85 in.)
G 40.0 mm (1.57 in.)
H 461.0 mm (18.15 in.)
I 458.0 mm (18.03 in.)
J 138 mm (5.43 in.)
K 95.0 mm (3.74 in.)
W1032756

7
8
4. TRANSMISSION
[POWER TRAIN] [NO OF TEETH]
a : REF NO
b : NO OF TEETH

[GEARING]

[GEAR RATIO]

A INPUT SHAFT E CLUTCH GEAR SHAFT

B 2ND SHAFT (REVERSE) F BRAKE (STEERING/PARKING)
C 3RD SHAFT (FORWARD) G OUTPUT SHAFT
D CLUTCH GEAR

K70E-U001
5. HYDRAULIC SYSTEM (DUMPING)
Hydraulic pump

Hydraulic pump : K52R

(Part no 89919-1160-0)
Discharge volume : 5cc/rev
8.0 / min at 1800rpm / 70kgf/cm2 (6.9MPa)
Revolution : 500 ~ 2000rpm
Relief valve set pressure : 95+5/kgf/cm2 (9.3+0.5MPa)
(at 1800rpm)
Tank capacity : 1.6
Pulley size (pump) : P.C.D. 136mm (Dia 147mm)
(Part no 89919-1181-0)
Pulley size (engine) : P.C.D. 56mm (Dia 67mm)
(Part no 89919-1141-0)

Flow of hydraulic oil

A B

K70E-U002

A : Pull-Down port
B : Push-up port

9
Hydraulic hose / Hydraulic cylinder

5 3 9 8 6 4

2 7

K70E-U003

1 : Hydraulic cylinder (part no 89911-1158-0 / 1 pce)

Pressure : 95kgf/cm2 (9.3MPa)
Stroke : 170mm
2 : Hydraulic pump (part no 89919-1160-0 / 1 pce)
3 : Hydraulic hose (part no 89919-1161-0 / 2 pcs)
Length : 2100mm
4 : Elbow (part no 89910-1188-0 / 2 pcs)
5 : Hose adapter with O-ring (part no 89919-1227-0 / 2 pcs)
6 : Cylinder pin (part no 89911-1159-0 / 1 pce)
7 : Cylinder pin (part no 89911-1161-0 / 1 pce)
8 : Cir-clip (E) (part no 04613-00150 / 4 pcs)
9 : Vinyl tube (part no 89919-1162-0 / 2 pcs)
10
6. FUEL SYSTEM
Fuel tank / Fuel hose

1) Fuel hose (Fuel tank ~ Fuel filter) / 10 Clip x 2 - part no 14911-4275-0 / 13

Size : L : 140mm x 1 pce / part no 09661-80140
2) Fuel hose (Fuel filter ~ Injection pump) / 11 Clip x 2 - part no 14911-4275-0 / 14
Size : L : 1100mm x 1 pce / part no 09661-81100
3) Overflow hose (Nozzle holder ~ Fuel tank) / 12 Clip x 2 - part no 14971-4275-0 / 15
Size : L : 2000mm x 1 pce / part no 09661-42000
Tube x 1 - part no 89919-1186-0 / 16

15

13
12
16
10 14
15
14
11

K70E-U015

11
7. V-BELT
Size of V-belt

1) V-belt (Engine pulley ~ Drive pulley) / 1

Size : SB35 ( Cog belt ) x 1 pce / part no 89919-1148-0
2) V-belt (Engine pulley ~ Hydraulic pump pulley) / 2
Size : SB25 x 1 pce / part no 89919-1156-0
3) V-belt (Drive pulley ~ Transmission pulley) / 3
Size : SC85 (Cog belt) x 1 pce / part no 89919-1149-0

3 7

1 4 2 8
K70E-U004

4 : Engine pulley (Part no 89919-1141-0)

pulley size - P.C.D. 67.5mm (Dia. 78.5mm)
5 : Drive pulley - Engine side (Part no 89919-1142-0)
pulley size - P.C.D. 130.9mm (Dia. 141.9mm)
6 : Drive pulley - Transmission side (Part no 89919-1146-0)
pulley size - P.C.D. 89mm (Dia. 103mm )
7 : Transmission pulley (Part no 89919-1147-0)
pulley size - P.C.D. 126mm (Dia. 140mm)
8 : Hydraulic pump pulley (Part no 89919-1181-0)
pulley size - P.C.D. 136mm (Dia 147mm)
12
 8. WIRING DIAGRAM

Cord color
B Black
Br Brown
G Green
L Blue
P Pink
R Red
SB Sky blue
W White
Y Yellow
BL Black / Blue
BW Black / White
GB Green / Black
LB Blue / Black
PB Pink / Black
RW Red / White
WB Red / White
YB Yellow / Black
K70E-U005 BR Black / Red

13
SERVICING
1. TIGHTENING TORQUE
2. OILS
3. GREASING
4. CAUTION FOR DISASSEMBLING AND REASSEMBLING
5. ADJUSTMENT OF COMPONENT PARTS
6. REPLACEMENT OF WEAR OUT PARTS
7. TROUBLESHOOTING AND COUNTERMEASURES
8. MAINTENANCE INTERVALS

14
1. TIGHTENING TORQUE
1) GENERAL BOLTS AND NUTS

Bolt torque
Material Grade Standard Bolt Special Bolt Special Bolt
Nominal Dia. SS41, S20C S43C, S487C (Refined) SCR3, SCM3 (Refined)
7.8 - 9.3 N.m 9.8 - 11.3 N.m 12.3 - 14.2 N.m
M6 0.80 - 0.95 kgf-m 1.00 - 1.15 kgf-m 1.25 - 1.45 kgf-m
5.8 - 6.9 lb.ft. 7.2 - 8.3 lb.ft. 9.0 - 10.5 lb.ft.
17.7 - 20.6 N.m 23.5 - 27.5 N.m 29.4 - 34.3 N.m
M8 1.80 - 2.10 kgf-m 2.40 - 2.80 kgf-m 3.00 - 3.50 kgf-m
13.0 - 15.2 lb.ft. 17.4 - 20.3 lb.ft. 21.7 - 25.3 lb.ft.
39.2 - 45.1 N.m 48.0 - 55.9 N.m 60.8 - 70.6 N.m
M10 4.00 - 4.60 kgf-m 4.90 - 5.70 kgf-m 6.20 - 7.20 kgf-m
28.9 - 33.3 lb.ft. 35.4 - 41.2 lb.ft. 44.8 - 52.1 lb.ft.
62.8 - 72.6 N.m 77.5 - 90.2 N.m 103.0 - 117.7 N.m
M12 6.40 - 7.40 kgf-m 7.90 - 9.20 kgf-m 10.50 - 12.00 kgf-m
46.3 - 53.5 lb.ft. 57.1 - 66.5 lb.ft. 75.9 - 86.8 lb.ft.
107.9 - 125.5 N.m 123.6 - 147.1 N.m 166.7 - 196.1 N.m
M14 11.00 - 12.80 kgf-m 12.60 - 15.00 kgf-m 17.00 - 20.00 kgf-m
79.6 - 92.6 lb.ft. 91.1 - 108.5 lb.ft. 123.0 - 144.7 lb.ft.
166.7 - 191.2 N.m 196.1 - 225.5 N.m 259.9 - 304.0 N.m
M16 17.00 - 19.50 kgf-m 20.00 - 23.00 kgf-m 26.50 - 31.00 kgf-m
123.0 - 141.0 lb.ft. 144.7 - 166.4 lb.ft. 191.7 - 224.2 lb.ft.
245.2 - 284.4 N.m 274.6 - 318.7 N.m 343.2 - 402.0 N.m
M18 25.00 - 29.00 kgf-m 28.00 - 32.50 kgf-m 35.00 - 41.00 kgf-m
180.0 - 209.8 lb.ft. 202.5 - 235.1 lb.ft. 253.2 - 296.5 lb.ft.
333.4 - 392.2 N.m 367.7 - 431.5 N.m 490.3 - 568.7 N.m
M20 34.00 - 40.00 kgf-m 37.50 - 44.00 kgf-m 50.00 - 58.00 kgf-m
245.9 - 289.3 lb.ft. 271.2 - 318.2 lb.ft. 361.6 - 419.5 lb.ft.

Bolt material grades are shown

by numbers punched on the bolt
heads. Prior to tightening, be
sure to check out the numbers as
shown below.

Punched Bolt Material

Number Grade
Standard Bolts SS41,
None
S20C
Standard Bolts SS43,
7
S48C (Refined)
Special Bolts SCR3,
9
SCM3 (Refined)

15
2) Crawler adjusting bolt : 100 ~ 110kgf . cm (9.8N . m ~ 10.8N . m)

1 : Stopper pin (Part no 89915-1198-0)

2 : Snap pin (Part no 89915-1202-0)
1
K70E-U006
3 : Crawler adjusting bolt (Part no 89915-1197-0)

3) Hose adapter for hydraulic pump : 200 ~ 240kgf . cm (19.6N . m~23.5N . m)

4) Brake case for transmission : 220 ~ 280kgf . cm (21.6N . m ~ 27.4N . m)

5) ROPS : Approx 1100kgf . cm ( 109N . m ) [M12 x 20 / 10.9T-10pcs]

16
2. OILS
1) TRANSMISSION OIL
Type of oil Quantity
Automatic transmission fluid (ATF) [DEXRON] 1.9L

1 2
1 Transmission oil port
2 Drain port

2) HYDRAULIC PUMP OIL

Type of oil Viscosity Quantity
Shell Tellus T46 or
Hydraulic oil ISO46 1.5
equivalent oil
NOTE
Total capacity of hydraulic pump oil with new cylinder and hoses : Approx. 1.9L.
Proper oil level A : Approx. 50mm / distance from oil port
(Hydraulic cylinder completed contacted)

A
3

4
K70E-U007

3 Oil port
4 Drain plug
17
3) ENGINE OIL
Capacity
Place Lubricants and fuel
OC60-E3 OC95-E3
Higher than CF class (API)
Above 25 °C (77 °F) : SAE10W-30
SAE10W-40
SAE30
0 to 25 °C (32 to 77 °F) :
1.3 L 1.7 L
Engine oil SAE10W-30
1.4 U.S.qts 1.8 U.S.qts
SAE10W-40
SAE20
Below 0 °C (32 °F) : SAE10W-30
SAE10W-40
SAE10

5 Oil plug
6 Drain plug

3. GREASING
• Greasing
CAUTION
To avoid personal injury:
• First stop the engine.
Apply a small amount of multipurpose grease or oil to the following points every 50 hours.
1 Cylinder lower (oil) 11 Brake lever (oil)
2 Cylinder upper (oil) 12 Accelerator lever (oil)
3 Shaft, bucket (grease) 13 Clutch Pedal Shaft (oil)
4 Lower roller (grease) 14 Main clutch tension arm (oil)
5 Upper roller (grease) 15 Speed change lever (grease)
6 Idler (grease) 16 Spring, speed change lever (oil)
7 Bogie roller (grease) 17 Tension arm (Transmission dreive V-belt) (oil)
8 Wire (Clutch, accelerator etc) (oil) 18 Cluch pedal shaft 2 (grease)
9 Steering lever (grease) 19 Dump lever shaft (oil)
10 Cluch lever (oil)

18
 5
1
2

6 4 4

12
19

19
 17 14

15

18

11 10
13

16

6 7

20
4. CAUTION FOR DISASSEMBLING AND REASSEMBLING
1) Sprocket
Before fitting the sprocket to shaft of transmission, apply the grease to the spline of shaft.
1

1 Grease
2 2 Sprocket
K70E-U008

2) Transmission
Fit the transmission to frame by 2 of U-bolts.
After that, check the angle of transmission (10°)

5 3 Transmission
4 6 4 Spring washer
5 Nut
6 U-bolt
K70E-U009

3) Adjusting bolt for rubber crawler

Apply the grease to adjusting bolt to prevent the rust of bolt and nut.

7 Adjusting bolt
K70E-U010 8 Spacer nut
21
4) V-belt
When replace the V-belt, check the tension of V-belt.
V-belt tension is very important for this machine.
Please check and adjust the tension of V-belt periodically.

V-belt (Engine pulley ~ Drive pulley)

Displacement at center of V-belt / load ot belt : 8 - 10mm / 5kgf.

9
9

9 V-belt

Size : SB35 (Cog belt) x 1 pce / part no 89919-1148-0

K70E-U011

V-belt (Engine pulley ~ Hydraulic pump pulley)

Displacement at center of V-belt / load ot belt : 8 - 10mm / 5kgf.

10
10

10 V-belt
K70E-U012

Size : SB25 x 1 pce / part no 89919-1156-0

V-belt ( Drive pulley ~ Transmission pulley )

Proper length of tension spring : 85mm
11

11 V-belt
11 12 Tension spring
12
12
K70E-U013

Size : SC85 ( Cog belt ) x 1 pce / part no 89919-1149-0

22
5) Clutch pedal
1. Check and adjust the length of pedal stopper bolt. (length :20mm)
2. Depress the clutch pedal completely.
3. Check the distance between clutch lever and control panel.
4. If the distance is exceed or lower the factory spec., loosen the lock nut and adjust the rod.
(Factory spec. : 37+2mm)
• Turn the rod 5 toward B
The clutch lever is moved toward operator's seat.
• Turn the rod 5 toward A
The clutch lever is moved toward bucket.

A B
5
1 Pedal stopper bolt
5 2 Clutch pedal
2 3 Clutch lever
1 4 Control panel
5 Rod
K70E-U014

3 5
4

2 1

IMPORTANT
• Check that when the clutch pedal is released, clutch pedal is returned to “Disengaged” position
automatically.
23
6) Speed change lever
1. Check and adjust the movement (forward/reverse) of speed change lever by turning the
speed change lever rod.
• Turn the speed change lever rod 6 toward B
The speed change lever bent to Forward side
• Turn the speed change lever rod 6 toward A
The speed change lever bent to Backward side
2. Check and adjust the movement (1st/2nd/3rd) of speed change lever by turning the speed
change lever rod.
• Turn the rod 7 toward B
The speed change lever bent to 3rd speed side
• Turn the rod 7 toward A
The speed change lever bent to 1st speed side

6
7

6
B

B A
7

K70E-U016

24
7) Parking brake lever
1. Check the operating force of parking brake lever by push-pull scale.
2. If the operating force is less than factory spec., move the adjus bolt for brake wire.
(Factory spec. : 4.5kgf)

K70E-U017 Parking brake lever

8) Steering brake
1. Center clutch gear of transmission is “Disengaged”, when pulling the position A of
synchro-lever approx. 16mm.

1 Adjust bolt
2 Synchro-lever
1

K70E-U018

IMPORTANT
• If you move the adjust bolt toward too much, steering brake is applied at all times.
This will cause the damage of transmission.
25
9) Hydraulic cylinder and Hose
1. Check and adjust the angle of elbow for Hydraulic cylinder.
(Factory spec. : 90°)

3 4

5 6

K70E-U019

4 5 6 5 6 3

3 Hydraulic pump 5 Hydraulic hose

(Part no 89919-1160-0) (Part no 89919-1161-0)
4 Hydraulic cylinder 6 Vinyl tube
(Part no 89911-1158-0) (Part no 89919-1162-0)
26
10) Accelerating wire
1. Check the plate of accelerating lever 7 touch the lever stopper 8 ,
when the speed control lever 9 is set to “HIGH” position
(The speed control lever 9 touch the stopper bolt 10)

10

IMPORTANT
• Do not adjust the length of stopper bolt 10.
The engine revolution of this machine is adjusted by the regulation of noise level
(Max. engine revolution with no load : approx 2950 rpm)

27
5. ADJUSTMENT OF COMPONENT PARTS
5-1 MAIN CLUTCH ADJUSTMENT
• Check and adjustment of V-belt tension (main clutch)
CAUTION
To avoid personal injury:
• Don’t adjust the height of the clutch pedal
locking bolt.
A
• This should be done after adjusting the
intermediate belt tension.
2 B
1. When the clutch (V-belts) slips, loose the lock nuts (2 3

pcs,) then move the adjust bolt toward B . 1

1 Clutch wire
2 Lock nut
3 Adjust bolt 4
Reference for proper belt tension
1) Depress the clutch pedal completely.
2) Depress the center of each belt with finger pressure.
5
Displacement at center of belt/load to belt
8 to 10 mm/5kgf

IMPORTANT
• Do not adjust by means of clutch pedal bolt.
• Too much movement toward B may loose normal
clutch function.
2. When you cannot disengage the clutch perfectly, 6
• move the adjust bolt toward A , or
• please prevent V-belts from turning around engine
pulley by adjusting V-belt stopper.
4 Engine pulley
5 Belt stopper
6 Clutch pedal bolt

28
5-2 PARKING BRAKE ADJUSTMENT
• Check and adjustment of parking brake
CAUTION
To avoid personal injury:
• Be sure to check the braking force of parking
brake after adjustment.
A
1. When the brake is too weak, please move the adjust
bolt toward B by loosening lock nuts.
B
2. When the brake is too strong, please move the adjust
3 2
bolt toward A by looseing lock nuts. 1
3. After the adjustment, tighten up the lock nuts.
1 Brake wire
2 Lock nut
3 Adjust bolt
4 Brake spring
Reference for proper brake spring tension
1) Set the parking brake lever is ON position. 4

2) Check the length (L) of brake spring.

Length of brake spring
70 to 71 mm

IMPORTANT
• If you move the adjust bolt toward B too much,
the brake is applied at all times. This will cause
the damage of transmission.

29
5-3 STEERING LEVER ADJUSTMENT
• Check and adjustment of steering lever
CAUTION 1
To avoid personal injury:
• First stop the engine.
• After servicing, make sure the function of
steering lever.
If it is difficult to disengage or engage the steering clutch,
check the following below.
1. Check the steering lever free travel.
2. If steering lever free travel exceeds the limit, loosen the
lock nuts and adjust the rod.
3. After the adjustment, tighten up the lock nuts.
[Proper steering lever free travel : 3mm]
3
1 Steering lever 2
2 Rod
3 Lock nut
5
• Check and adjustment of steering brake 5

CAUTION
To avoid personal injury:
• First stop the engine.
• Be sure to check the braking force of steering
brake after adjustment. 4

1. Set the parking brake lever at ON position.

2. Check that the adjust bolt 7 contacts to brake plate 6 ,
when pulling the steering lever approx. 85 to 95mm.
4 Parking brake lever “ON” A
5
5 Steering lever
A 85 to 95
6 Brake plate
7 Adjust bolt
IMPORTANT
• If you move the adjust bolt toward too much, the
6
steering brake is applied at all times. This will cause 7
the damage of transmission.

30
5-4 BELT TENSION ADJUSTMENT
• Check and adjustment of steering lever
CAUTION
To avoid personal injury:
• First stop the engine.
1. Loosen the V-belt tension by loosening lock nut for tension bolt after a little loosening two of
bolts for hydraulic pump.
2. Adjust the tension by tightening adjusting bolt for tension bolt.
3. After the adjustment, tighten up the lock nut and two of bolts for hydraulic pump. Reference
for proper belt tension:
Depress the center of V-belt with thumb pressure.
Displacement at center of belt / load to belt
[8 to 10 mm / 5 kgf]
1 Lock nut
2 Adjusting bolt
1 2

• Check and adjustment of V-belt tension (Transmission drive belt)

CAUTION
To avoid personal injury:
1. Be sure to stop the engine and remove the
key before checking the belt tension.
2. Be sure to reinstall the detached safety shield
after maintenance or checking.
Transmission drive belt
1. When the V-belt slips, 3 4

Loosen the lock nut 3 , then adjust the V-belt tension

by tightening the adjust nut 4 .
3 Lock nut
4 Adjust nut
2. Check the length (L) of tension spring.
Length of tension spring : Approx. 85mm

31
5-5 CRAWLER ADJUSTMENT
• Check and adjustment of rubber crawler tension
CAUTION
To avoid personal injury:
• If the crawler tension is too high, abnormal
stress will be applied to the idler, sprocket
and crawler, causing serious accidents or A

excessive wear to occur.

Adjust the crawler tension by turning adjusting bolt after
detach the snap pin and stopper to make clearance A
between 15~20mm when pushed with the thumb.
[Proper steering lever free travel : 3mm]
1 Pin
2
2 Snap pin
3
3 Adjusting bolt
IMPORTANT
• Be sure to move the machine forward
before the adjustment. This is because,
1
after backward movement of the machine,
the crawler is tensed on the upper side,
making correct adjustment impossible.
• The adjusting bolt will become difficult
to turn when the sticking mud hardens.
• After work, always grease the thread. K70E-U006

• Excessive tension results in trouble such as:

• Increase of running resistance and reduction of driving power.
• Excessive wear of crawler.
• Insufficient tension results in trouble such as:
• Disengagement of crawler.
• Defective engagement of sprocket.
• Excessive wear of crawler.
• After completing the work, clean the crawler units, removing sticking soil completely.

32
6. REPLACING OF WEAR OUT PARTS
1) Brake lining & Brake drum wear
Measure the brake lining O.D & the brake drum I.D. with the vernier calipers.
If the measurement is less than the allowable limit, replace the parts
Brake Lining Outside Dia.
Factory spec. : 99.0 ~ 99.2mm
Allowable limit : 97.0mm

Brake Dram Inside Dia.

Factory spec. : 100.0 ~ 100.2mm
Allowable limit : 100.5mm

IMPORTANT
Reassembling of brake case
Tighten up bolts (4 pcs) after activating the brake (push the brake lever)

1 Bolt 2 Brake lever

K70E-U020

33
7. TROUBLESHOOTING AND COUNTERMEASURES
1-1. The machine does not drive powerful.

The crawler tension is too high.

Check and adjust the crawler tension.

See “5. CRAWLER ADJUSTMENT” under “ADJUSTMENT OF COMPONENT
PARTS.”.

1-2. The machine does not drive powerful.

The main clutch ( V-belts ) slips.

Check and adjust of V-belt tension (main clutch).

See “1. MAIN CLUTCH ADJUSTMENT” under “ADJUSTMENT OF COMPONENT
PARTS.”.

1-3. The machine does not drive powerful.

The parking brake is applied at all time.

Check and adjust of parking brake.

See “2. PARKING BRAKE ADJUSTMENT” under “ADJUSTMENT OF COMPONENT
PARTS.”.

1-4. The machine does not drive powerful.

The brake lever ( brake plate ) for transmission does not return correct position by lack of
lubrication.

Check and apply a oil a little.

See “3. STEERING LEVER ADJUSTMENT” under “ADJUSTMENT OF COMPONENT
PARTS.”.

34
2-1. The machine continued to turning.

The parking brake is applied at all time.

Check and adjust of parking brake.

See “2. PARKING BRAKE ADJUSTMENT” under “ADJUSTMENT OF COMPONENT
PARTS.”.

2-2. The machine continue to turning.

The brake lever (brake plate) for transmission does not return correct position by lack of
lubrication.

Check and apply a oil a little.

See “3. STEERING LEVER ADJUSTMENT” under “ADJUSTMENT OF COMPONENT
PARTS.”.

3-1. The engine stop or engine revolution decrease, when turning the machine.

The steering brake is applied before disengaging the center clutch gear of transmission.

Check and adjust steering brake.

See “3. STEERING LEVER ADJUSTMENT” under “ADJUSTMENT OF COMPONENT
PARTS.”.

35
8 MAINTENANCE INTERVALS
[EVERY 25 SERVICE HOURS]
• Check of steering lever
• Check of V-belt tension (main clutch)

[EVERY 50 SERVICE HOURS]

• Check of steering brake
• Check of parking brake
• Greasing
• Draining water of the fuel tank
• Check of rubber crawler tension
• Check of Rubber hoses and clamp bands

[EVERY 100 SERVICE HOURS]

• Check of the electrical circuit and looseness of the coupler
• Check of speed change lever
• Check of roller and idler
• Check of V-belt tension (hydraulic pump)
[after first 25 service hours]
• Cleaning of air cleaner element
• Cleaning of fuel filter
• Check of battery electrolyte level
• Check of hydraulic pump oil level
• Change of engine oil
[after first 25 service hours]
• Cleaning of oil filter
[after first 25 service hours]

[EVERY 200 SERVICE HOURS]

• Check of hydraulic hoses and clamp bands (hydraulic pump)
• Check of intake air line

[EVERY 300 SERVICE HOURS]

• Change of transmission oil
[after first 50 service hours]

36
[EVERY 400 SERVICE HOURS]
• Replacement of fuel filter element

[EVERY 500 SERVICE HOURS]

• Change of hydraulic pump oil

[EVERY 800 SERVICE HOURS]

• Check of valve clearance

[EVERY 1500 SERVICE HOURS]

• Check fuel injection nozzle injection pressure

[EVERY 2000 SERVICE HOURS]

• Check of alternator and starter motor

[EVERY 3000 SERVICE HOURS]

• Check of injection pump

[EVERY ONE OR TWO MONTHS]

• Recharging of battery

[EVERY ONE YEAR]

• Check of the electrical circuit and looseness of the coupler
• Replacement of air cleaner element
[every year or every 6 times at cleaning]

[EVERY TWO YEARS]

• Replacement of battery
• Replacement of rubber hoses and clamps
• Replacement of intake air line
• Replacement of hydraulic hoses and clamp bands

37
 EDITOR:
KUBOTA CORPORATION
CONSTRUCTION MACHINERY DIVISION
CUSTOMER TECHNICAL SUPPORT DEPARTMENT
1-1-1 NAKAMIYA-OHIKE, HIRAKATA-CITY, OSAKA, 753-0004 JAPAN
PHONE : (81)72-890-2888
FAX : (81)72-890-2886
E-mail : ce-sv@kubota.co.jp

KUBOTA Corporation Printed in Japan 2009. 09, H, H, H, e Code No.RY921-20110