PARTS LIST

For

Hydraulic Drifter

Model: YH80

Read this instruction manual before operating this equipment.

This manual contains important safety information.

Do not destroy this manual.
This manual must be available to the personnel who operate and maintain
this machine.

CPN 51793800 PL6036

Revision 2
PARTS LIST INDEX PL6036
Revision 2 For Index
January 21, 1994 Hydraulic Drifter YH80 Page 1 of 2

ORDERING INSTRUCTIONS
When ordering service parts, please specify:

1. The NAME of each part as listed.

2. The PART NUMBER as listed or stamped on the part.
3. The SERIAL NUMBER of the equipment.

DO NOT use illustration numbers when ordering service parts. To save time, send all orders for
parts to the nearest branch office or agent. IF IT IS NECESSARY TO SEND ANY PART OF THIS
EQUIPMENT TO THE FACTORY, INQUIRE AT OUR NEAREST BRANCH OFFICE OR AGENT
FOR SPECIAL INSTRUCTIONS.

SERIAL NUMBER IS STAMPED

IN THIS AREA OF DRIFTER.

SAVE THESE INSTRUCTIONS. DO NOT DESTROY.

All information, illustrations, and specifications in this parts list are based on the
latest information available at the time of publication. Product improvement is a
continuing goal at Ingersoll- Rand. Design and specifications are subject to change
without notice or obligation.

When the life of the tool has expired, it is recommended that the tool be disassembled,
degreased and parts be separated by material so that they can be recycled.

 1994 Ingersoll-- Rand Company Printed in U.S.A.

 Each column includes the Parts List
Section Numbers applicable to the assembly.
NAME OF ASSEMBLY
Components of an assembly
are indented.
Manual Section
No. No.

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PL6036 1

Hydraulic Drifter YH80 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PL6036 2

Reverse Percussion Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PL6035 3

Rotation Motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PL6036 4

General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PL6036 5

Page 2, Index, PL6036

PARTS LIST PL6036
Revision 2 INTRODUCTION Section 1
January 21, 1994 Page 1 of 2

Alphabetical Index
Title Page No.
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Safety First . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

1. INTRODUCTION. instructions. Failure to comply could result

in bodily injury.
This parts list contains spare part numbers,
general model information and important b. Always wear approved hard hat, safety
safety information for the Hydraulic Drifter shoes, safety glasses, nose mask and ear
YH80 (hereafter referred to as drifter). protection when near a drifter in operation.
c. Use only Ingersoll--Rand replace--
2. SAFETY FIRST. ment parts.
SAFETY FIRST is the primary concern for d. Keep hands, arms, legs and clothing
the protection of both, personnel and the away from all moving parts. Failure to
drifter during any phase of operation. All comply could result in bodily injury.
personnel must thoroughly understand all
safety precautions before operating or do- e. The drifter, striking bar, couplings, drill
ing any maintenance work on the drifter. steels and bit are hot during the drilling
operation. Do not touch these parts with
your bare hands. Wear gloves to protect
3. SAFETY PRECAUTIONS. your hands when you are changing bits or
steels. A severe burn will result if rotating
The Safety Precautions listed are intended parts are touched with bare hands.
to make all personnel aware of the hazards
while working on or near a drifter. All per- f. Keep all hose connections tight. A
sonnel must use common sense and a loose hose connection not only causes
good working practice while operating and leaks and poor performance, but may also
maintaining this drifter. The safety precau- allow the hose to come off the drifter, whip
tions listed are of a general nature and can- around, and injure the operator or other
not cover every possible situation: people in the area.
a. Do not attempt to operate the hydraulic g. Make sure that the parts--cleaning
drifter unless you are thoroughly familiar solvent is non--flammable, will not harm the
with all the crawler gauges, controls, and skin, meets current safety and health
functions. Refer to the section of the standards, and is used in well ventilated
crawler instruction book for detailed area.

 1994 Ingersoll-- Rand Company Printed in U.S.A.

 h. Dry nitrogen is the only gas product to attempted.
be used to charge the drifter accumulators.
Never use oxygen to charge the j. Make sure the accumulators are in
accumulators. Ignition of an oxygen and oil good condition. Make sure the
mixture could produce an explosion, which accumulator components have no cracks
could severely injure personnel in the area. or signs of excessive wear. When
pressurized, a damaged accumulator
could burst, scattering metal fragments
i. Be sure to bleed the accumulators throughout the area which could severely
before any accumulator disassembly is injure personnel.

Page 2, Section 1, PL6036

PARTS LIST PL6036
Hydraulic Drifter
Revision 2 Section 2
YH80
January 20, 1994 Page 1 of 4

HP

LP

HP

Hydraulic Drifter YH80– Sectional Illustration

(For Parts List, refer to Page 2)
 Hydraulic Drifter YH80
(For Illustration of parts, refer to Page 1)

NAME OF PART
REF PART Parts indented under an item QTY. REMARKS
NO. NO. are included with that item.

51667327 Hydraulic Drifter YH80

(CONSISTS OF THE FOLLOWING)
51317196 ASSEMBLY, BACKHEAD 1
1 51317204 .BACKHEAD 1
2 51206068 .SUPPORTER, BLOW TUBE 1
3 50787738 .PLUG 1
4 50787753 .PLUG 1
* 5 51325041 .O--RING 1
* 6 51325058 .O--RING 3
7 51327716 .PIN, SPRING 1
8 51343259 .BUSHING 1
9 51165850 .ADAPTER, HOSE 1
10 51176501 .ADAPTER 1
11 51175834 .PLUG 1
12 51162204 .SEAL 3
51206126 ASSEMBLY, BACKHEAD GLAND 1
13 51206134 .GLAND, BACKHEAD 1
14 50748250 .SEAL 1
15 51206639 .ADAPTER 1
16 51176543 .NUT, HOSE 1
* 17 51103778 .O--RING 1
51317246 ASSEMBLY, BLOW TUBE 1
18 51317253 .TUBE, BLOW 1
19 51206167 .RUBBER 1
20 51206175 .HOLDER, RUBBER 1
51317261 ASSEMBLY, CYLINDER 1
21 51317279 .CYLINDER 1
* 22 51104230 .O--RING 1
23 51153658 .BUSHING 1
24 51165918 .ADAPTER, HOSE 1
25 51327773 .PLUG 1
* 26 50787043 .O--RING 2
51317295 ASSEMBLY, CYLINDER LINER 1
27 51317303 .LINER, CYLINDER 1
+ 28 51317311 .SEAL 2
51669976 ASSEMBLY, BACK LINER 1
29 51669984 .BACK LINER, CYLINDER 1
30 51325041 .O--RING 1
+ 31 51317345 .SEAL 1
+ 32 51317352 .SEAL 1
33 51317360 .GUIDE, VALVE 1
34 51669992 VALVE 1
35 51317386 PISTON 1
51317394 ASSEMBLY, FRONT LINER 1
36 51317402 .LINER, FRONT 1
* 37 51546026 .O--RING 1
+ 38 51317428 .RING, WIPER 1

Hydraulic Drifter YH80 (Cont.)

(For Illustration of parts, refer to Page 1)
Page 2, Section 2, PL6076
 Hydraulic Drifter YH80 (Cont.)
(For Illustration of parts, refer to Page 1)

NAME OF PART
REF PART Parts indented under an item QTY. REMARKS
NO. NO. are included with that item.

51667327 Hydraulic Drifter YH80 (cont.)

(CONSISTS OF THE FOLLOWING)
51155125 ASSEMBLY, ACCUMULATOR 3
39 51206381 .BODY 1
40 51206399 .COVER 1
++ 41 51206407 .DIAPHRAGM 1
42 51176741 .VALVE 1
++ 43 51176758 .WASHER, SEAL 1
44 51176766 .CAP 1
* 45 51104198 .O--RING 1
46 51260032 .BOLT 4
51317444 ASSEMBLY, HYDRAULIC MOTOR 1
47 51267623 .MOTOR, ROTATION
(REFER TO SECTION 2) 1
48 51124840 .ELBOW 1
49 51124816 .BUSHING 1
50 51165876 .ADAPTER, HOSE 1
* 51 50787050 .O--RING 2
* 52 51176808 .O--RING 1
53 51329308 .CAPSCREW 4
51525988 ASSEMBLY, GEAR BOX 1
54 51525996 .BOX, GEAR 1
55 51206498 .BUSHING 1
56 51176477 .PIN, SPRING 1
* 57 51206084 .O--RING 1
51206514 ASSEMBLY, DRIVE GEAR 1
58 51206522 .GEAR, DRIVE 1
59 50781962 .BEARING, BALL 2
51206530 ASSEMBLY, IDLER GEAR 1
60 51206548 .GEAR, IDLER 1
61 51206555 .BEARING, NEEDLE 2
62 51206597 .SHAFT, GEAR 1
* 63 51104131 .O--RING 1
51206613 ASSEMBLY, COVER 1
64 51206621 .COVER 1
65 51104198 .O--RING 1
66 50945385 .BOLT 4
51537165 ASSEMBLY, DRIVER 1
67 51206662 .DRIVER, CHUCK 1
68 51533107 .SET, BUSHING 1
51537157 ASSEMBLY, CHUCK END 1
69 51526010 .END, CHUCK 1
70 51206712 .BUSHING 1
71 51104289 .O--RING 1
72 51533073 .CHUCK 1
51537173 ASSEMBLY, CAP 1
73 51206746 .CAP, CHUCK END 1

Page 3, Section 2, PL6076

 Hydraulic Drifter YH80 (Cont.)
(For Illustration of parts, refer to Page 1)

NAME OF PART
REF PART Parts indented under an item QTY. REMARKS
NO. NO. are included with that item.

51667327 Hydraulic Drifter YH80 (cont.)

(CONSISTS OF THE FOLLOWING)
74 51533115 .LINER, CAP 1
* 75 51104248 .O--RING 1
51206779 ASSEMBLY, BOLT 2
76 50944990 .BOLT 1
77 51206787 .NUT, NYLON 1
51317485 ASSEMBLY, THROUGH BOLT 4
78 51317493 .BOLT, THROUGH 1
79 51525954 .NUT 1
* 80 51103760 .O--RING 1
51206829 ASSEMBLY, EYE BOLT 1
81 51206845 .PLATE, HOOK 1
82 51206852 .BOLT 2
83 51206837 .BOLT, EYE 2
84 50855923 .WASHER, SPRING 2

* NOTICE: THESE PARTS ARE INCLUDED IN DRIFTER O-RING KIT 51676237.

+ NOTICE: THESE PARTS ARE INCLUDED IN DRIFTER SEAL KIT 51676245.
++ NOTICE: THESE PARTS ARE INCLUDED IN DIAGHRAGM KIT 51676252.

Page 4, Section 2, PL6076

PARTS LIST PL6036
Revision 1 ROTATION MOTOR Section 4
January 21, 1994 Page 1 of 2

Rotation Motor -- Exploded View

(For Parts List, refer to Page 2)

 1994 Ingersoll-- Rand Company Printed in U.S.A.

 Rotation Motor
(For Illustration of parts, refer to Page 1)

NAME OF PART
REF PART Parts indented under an item QTY. REMARKS
NO. NO. are included with that item.

51267623 ROTATION MOTOR

(CONSISTS OF THE FOLLOWING)
1 51540847 HOUSING, BEARING 1
2 51540870 KIT, SHAFT/BEARING 1
3 51540896 PLATE, WEAR 1
4 51540904 DRIVE 1
5 51540912 GEROLER 1
6 51538999 DRIVE, VALVE 1
7 51540938 PLATE, VALVE 1
8 51539005 VALVE 1
9 51540953 PLATE, BALANCE 1
10 51539021 SPRING 2
11 51539013 PIN 2
12 51541001 HOUSING, VALVE 1
13 51541019 PLUG, BOSS 1
14 51541035 BALL, STEEL 2
15 51540987 PLUG, BOSS 2
16 51541084 BOLT 4
51676260 KIT, MOTOR SEAL 1
51287746 .KIT, SHAFT SEAL 1
17 ++ ..SEAL, DUST 1
18 ++ ..O--RING 1
19 ++ ..SEAL, OIL 1
20 ++ ..SEAL, SHAFT FACE 1
51287738 .KIT, MOTOR REAR SEAL 1
21 ++ ..O--RING 2
22 ++ ..O--RING 3
23 ++ ..O--RING 1
24 ++ ..SEAL, OUTER FACE 1
25 ++ ..SEAL, INNER FACE 1
26 ++ ..O--RING 1
27 ++ ..O--RING 2

++ NOTICE: THESE PARTS ARE NOT SOLD SEPARATELY, THEY ARE INCLUDED IN THE KIT IN
WHICH THEY ARE INDENTED UNDER.

Page 2, Section 4, PL6036

PARTS LIST PL6036
Revision 1 GENERAL INFORMATION Section 5
January 21, 1994 Page 1 of 2

GENERAL. ACCUMULATORS.
The YH80 Hydraulic Drifter (drifter) is a The drifter uses three built--in nitrogen--
valved, hydraulically--operated hammer drill charged, diaphragm--type accumulators to
that incorporates an integral, independently-- dampen vibrations in the supply and return
controlled, hydraulically--powered rotation lines. The high pressure accumulator must be
motor to rotate the drill steel and bit. charged to 853 psi (60 kg/cm2) and the low
pressure accumulators must be charged to 57
The drifter is capable of drilling 3 to 4 in. (75 psi (4 kg/cm2).
to 102 mm) diameter holes in all types of rock
formations. It is especially suitable for pipeline
work, drilling vertical and angle holes in quar-
ries, and on any construction jobs where large
volume rock excavations are required. An accumulator charging kit is fur-
nished as an accessory item with the
ROTATION MOTOR. machine on which the drifter is used.

The hydraulically--powered rotation motor

is independently controlled and is designed to FRONT END LUBRICATION.
provide continuous drill steel rotation -- forward The drifter uses an oil mist to provide lubri-
or reverse. The motor converts hydraulic fluid cation to all critical points in the front end of the
to rotation power and transmits the rotation drifter. A 3/8 in. (9.5 mm) diameter hose line
power to the spur gear train housed in the drift- connected to the drifter carries the oil--laden
er fronthead. The hydraulic rotation motor pro- air from a lubricator (part of the drilling ma-
vides smooth, powerful rotation, especially at chine) to the drifter front end parts. Oil flow is
low rotation speeds, and assures the operator controlled by the lubricator located on the drill-
of positive rotation control under all drilling ing machine.
conditions.

BLOWER TUBE.
Refer to IM6036, “Instruction Manual
The drifter has a single blower tube con- For Hydraulic Drifter Model YH80” for
struction. The blower tube carries hole clean- maintenance instructions.
ing air from the inlet connection in the back-
head, through the center of the drifter, striking
bar, steel and bit to the bottom of the hole with- REVERSE PERCUSSION KIT. (Furnished
out contacting any of the internal parts of the Only When Specially Ordered)
drifter.
The standard drifter does not include re-
CHUCK PARTS. verse percussion as standard equipment. The
reverse percussion kit must be ordered sepa-
The drifter is equipped with chuck parts to rately. Refer to Section 3 of this parts list for
accommodate a 6--spline striking bar. part numbers.

 1994 Ingersoll-- Rand Company Printed in U.S.A.

STRIKING BARS. (Furnished Only When as standard equipment. The striking bar must
Specially Ordered) (Table 1) be specially ordered. Table 1 lists the available
The drifter does not include a striking bar striking bars for use with the drifter.

Table 1. Striking Bars

Striking Bar Striking Bar Specifications

SB38YH65 6--Spline Drive

(51780989) T38 Thread (Male)
For 3/4 in. (19 mm) Diameter Blower Tube
SB45YH65 Same as above except with
(51781003) T45 Thread (Male)
♦ SB45SYH65RP 6--Spline Drive
(51781128) T45 Thread (Male)
For 3/4 in. (19 mm) Diameter Blower Tube

NOTICE: Use an 8--digit part number (51780989 or 51781003 or

51781128) when ordering the required striking bar.
♦NOTICE: This striking bar is for use ONLY with the reverse percussion kit.

Page 2, Section 2, PL6036

Atlas Copco Drilling Solutions, Inc. A Company Within the Atlas Copco Group
P.O.Box 462288, 2100 North First Street Phone: +1 972-496-7400
Garland, Texas 75046-2288 Fax: +1 972-496-7425
www.atlascopco.com/drillingsolutions info.acds@atlascopco.com
 INSTRUCTION MANUAL

For

Hydraulic Drifter

Models: YH80

Read this instruction manual before operating this equipment.

This manual contains important safety information.

Do not destroy this manual.
This manual must be available to the personnel who operate and maintain
this machine.

CPN 51793818 IM6036

Revision 2
Instruction Manual IM6036
TABLE OF CONTENTS Section TC--1
December 17, 1992 Page 1 of 2

Title Section

INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Abbreviation List
Introduction
Reference Material
Support Equipment Required

SAFETY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Introduction
Safety First
Safety Precautions

DESCRIPTION AND SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Description
Introduction
Specifications

OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Air Requirements
Basic Operating Principles
Drill Piston Reciprocation
Drill Steel Rotation
Charging the Drifter Accumulators
Connecting the Striking Bar to the Drifter
Drilling Procedures
Drilling Tips
Bit Care
Drill Steel Care
Suggestions for Drillers
Hoses and Fittings
Hydraulic Requirements
Introduction
Lubrication Requirements
Operating Controls
Receiving the New Drifter
 TABLE OF CONTENTS (cont.)

Title Section

MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Description
Drifter
Hoses
Hydraulic System
Inspection of Parts
Introduction
Lubricant Specifications
Drill Steel Thread Lubricant
Front End Lubricating Oil (Rock Drill Oil)
Hydraulic Oil
Maintenance
Accumulator Reassembly Instructions
Drifter Disassembly Instructions
Drifter Reassembly Instructions
Hydraulic Rotation Motor Disassembly
Hydraulic Rotation Motor Reassembly
Inspection of Accumulator Pressures
Reverse Percussion Kit Disassembly Instructions
Reverse Percussion Kit Reassembly Instructions

TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Introduction
Troubleshooting

MAINTENANCE RECORDS AND NOTES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Page 2, Section TC--1, IM6036

Instruction Manual IM6036
INTRODUCTION Section 1
December 17, 1992 Page 1 of 2

Alphabetical Index

Title Page No.

Abbreviation List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Reference Material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Support Equipment Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

4. INTRODUCTION. 6. REFERENCE MATERIAL.

This instruction manual contains informa- The reference materials required to oper-
tion for safety, operation, maintenance, ser- ate and/or maintain the drifter are listed in Ta-
vice information and troubleshooting for the ble 2.
Hydraulic Drifter YH80 (hereafter referred to
as drifter).
7. ABBREVIATION LIST.
5. SUPPORT EQUIPMENT REQUIRED.
Abbreviations listed in this manual that are
The support equipment required to operate not common are listed in Table 3 with the prop-
and/or maintain the drifter is listed in Table 1. er definition.

Table 1. Support Equipment Required

Item Requirements or Specification

Air Requirements: For normal drilling conditions, a compressor having a capac-
ity of 220 scfm (6.23 m3/min.) at 100 psi (7.03 kg/cm2). For
fronthead lubrication and hole cleaning.
Hydraulic Requirements

.Hammer Operation 29.27 GPM (110 Liters/Min.) at 1991 psi (140 kg/cm2).

.Drill Steel Rotation 11.89 GPM (45 Liters/Min.) at 1991 psi (140 kg/cm2).

Lubrication Requirements Oil mist controlled from lubricator (on drilling machine).

Table 2. Reference Material

Manual No. Title of Manual

PL6036 Parts List for Hydraulic Drifter Model YH80.

 Table 3. Abbreviation List
Abbreviation, Symbol, or Term Meaning

bpm Blows Per Minute

bhp Brake Horsepower
m3/min. Cubic Meters Per Minute
ft. Feet
gpm Gallons Per Minute
in. Inch
IR Ingersoll--Rand
kg Kilogram
kg/cm2 Kilogram Per Square Centimeter
lbs Pounds
lb--ft Pound--Foot
lpm Liters Per Minute
L Liter
L.H. Left--Hand
ml Milliliters
mm Millimeter
mPa Mega Pascals
M Meter
Nm Newton Meter
psi Pounds Per Square Inch
scfm Standard Cubic Feet Per Minute

All information, illustrations, and specifications in this manual are based on the latest
information available at the time of publication. Product improvement is a continuing
goal at Ingersoll- Rand. Design and specifications are subject to change without
notice or obligation.

Portions of the information used in the preparation of this instruction manual was taken from
the original Form 5043--7 “YH80 Hydraulic Drifter”, instruction manual.

SAVE THESE INSTRUCTIONS. DO NOT DESTROY.

When the life of the tool has expired, it is recommended that the tool be disassembled,
degreased and parts be separated by material so that they can be recycled.

Page 2, Section 1, PL6036

Instruction Manual IM6036
SAFETY Section 2
December 17, 1992 Page 1 of 2

Alphabetical Index
Title Page No.
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Safety First . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

8. INTRODUCTION.

This section contains important safety in- DANGER IS USED TO INDICATE

formation for the Hydraulic Drifter YH80 (here- THE PRESENCE OF A HAZARD
after referred to as drifter). WHICH WILL CAUSE SEVERE
PERSONAL INJURY OR DEATH IF
THE WARNING IS IGNORED.

9. SAFETY FIRST.
WARNING IS USED TO INDICATE
SAFETY FIRST is the primary concern for THE PRESENCE OF A HAZARD
the protection of both, personnel and the drifter WHICH CAN CAUSE SEVERE IN-
during any phase of operation. All personnel JURY OR DEATH IF THE WARN-
must thoroughly understand all safety precau- ING IS IGNORED.
tions before operating or doing any mainte-
nance work on the drifter.

CAUTION IS USED TO INDICATE THE

PRESENCE OF A HAZARD WHICH
WILL OR CAN CAUSE PERSONAL
10. SAFETY PRECAUTIONS. (Table 1.) INJURY, OR PROPERTY DAMAGE IF
THE WARNING IS IGNORED.
The Safety Precautions listed in Table 1 are
intended to make all personnel aware of the
dangers while working on or near a drifter. All
personnel must use common sense and a
good working practice while operating and Notice is used to notify people of in-
maintaining this drifter. The precautions are of stallation, operation, or maintenance
a general nature and cannot cover every pos- information which is important but
sible situation. not hazard--related.
All personnel must understand the DAN-
GER, WARNING, CAUTION, and NOTICE By understanding what DANGER, WARN-
used throughout the text of this instruction ING, CAUTION, and NOTICE mean; and us-
manual, and on the Safety Labels located on ing good judgment and common sense; all
the drifter. The DANGER, WARNING, CAU- personnel can avoid injuring themselves and/
TION, and NOTICE are defined as follows: or damaging the drifter.
 The Safety Labels shown in this manual Ingersoll--Rand Company
and on the machine are for operator protec- Rock Drill Division
tion. Replacement Safety Labels can be ob- 7500 Shadwell Drive
tained at no cost from your local Ingersoll-- Roanoke, Virginia 24019
Rand dealer or representative or by contacting U.S.A.
the factory at: (703) 362--3321

Table 1. Safety Precautions

18. DO NOT ATTEMPT TO OPERATE THE HYDRAULIC DRIFTER UNLESS YOU
ARE THOROUGHLY FAMILIAR WITH ALL THE CRAWLER GAUGES, CON-
TROLS, AND FUNCTIONS. REFER TO THE SECTION OF THE CRAWLER IN-
STRUCTION BOOK FOR DETAILED INSTRUCTIONS. FAILURE TO COMPLY
COULD RESULT IN BODILY INJURY.
19. ALWAYS WEAR APPROVED HARD HAT, SAFETY SHOES, SAFETY GLASSES,
NOSE MASK AND EAR PROTECTION WHEN NEAR A DRIFTER IN OPERA-
TION.
20. KEEP HANDS, ARMS, LEGS AND CLOTHING AWAY FROM ALL MOVING
PARTS. FAILURE TO COMPLY COULD RESULT IN BODILY INJURY.
21. THE DRIFTER, STRIKING BAR, COUPLINGS, DRILL STEELS AND BIT ARE
HOT DURING THE DRILLING OPERATION. DO NOT TOUCH THESE PARTS
WITH YOUR BARE HANDS. WEAR GLOVES TO PROTECT YOUR HANDS
WHEN YOU ARE CHANGING BITS OR STEELS. A SEVERE BURN WILL RE-
SULT IF ROTATING PARTS ARE TOUCHED WITH BARE HANDS.
22. KEEP ALL HOSE CONNECTIONS TIGHT. A LOOSE HOSE CONNECTION NOT
ONLY CAUSES LEAKS AND POOR PERFORMANCE, BUT MAY ALSO ALLOW
THE HOSE TO COME OFF THE DRIFTER, WHIP AROUND, AND INJURE THE
OPERATOR OR OTHER PEOPLE IN THE AREA.
23. MAKE SURE THAT THE PARTS--CLEANING SOLVENT IS NON--FLAMMABLE,
WILL NOT HARM THE SKIN, MEETS CURRENT SAFETY AND HEALTH STAN-
DARDS, AND IS USED IN WELL VENTILATED AREA.
24. DRY NITROGEN IS THE ONLY GAS PRODUCT TO BE USED TO CHARGE THE
DRIFTER ACCUMULATORS. NEVER USE OXYGEN TO CHARGE THE ACCU-
MULATORS. IGNITION OF AN OXYGEN AND OIL MIXTURE COULD PRODUCE
AN EXPLOSION, WHICH COULD SEVERELY INJURE PERSONNEL IN THE
AREA.
25. MAKE SURE THE ACCUMULATORS ARE IN GOOD CONDITION. MAKE SURE
THE ACCUMULATOR COMPONENTS HAVE NO CRACKS OR SIGNS OF EX-
CESSIVE WEAR. WHEN PRESSURIZED, A DAMAGED ACCUMULATOR
COULD BURST, SCATTERING METAL FRAGMENTS THROUGHOUT THE
AREA WHICH COULD SEVERELY INJURE PERSONNEL.
26. BE SURE TO BLEED THE ACCUMULATORS BEFORE ANY ACCUMULATOR
DISASSEMBLY IS ATTEMPTED.

Page 3, Section 2, IM6036

Instruction Manual IM6036
Revision 1 DESCRIPTION & SPECIFICATIONS Section 3
April 7, 1993 Page 1 of 4

Alphabetical Index

Title Page No.

Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

11. INTRODUCTION. er fronthead. The hydraulic rotation motor pro-

vides smooth, powerful rotation, especially at
This section provides a description and low rotation speeds, and assures the operator
specifications of the Hydraulic Drifter YH80 of positive rotation control under all drilling
(hereafter referred to as drifter). conditions.
Since hammer action and drill steel rotation
12. DESCRIPTION. (Figure 1) are independently controlled, the best combi-
nation of individual control of both functions
The hydraulic drifter is a valved, hydrauli- can be selected for the most efficient drilling in
cally--operated hammer drill that incorporates a particular formation.
an integral, independently--controlled, hy-
draulically--powered rotation motor to rotate Since the drifter operates on hydraulic fluid
the drill steel and bit. power, instead of air, its operation is unaf-
fected by altitude. In addition, there is no noise
The drifter is capable of drilling 3 to 4 in. (76 from air exhaust and no fog buildup in working
to 100mm) diameter holes in all types of rock areas.
formations. It is especially suitable for pipeline
work, drilling vertical and angle blast holes in The only air requirements for the drifter are:
quarries, and on any construction jobs where for hole cleaning and fronthead lubrication.
large volume rock excavations are required. The drifter is equipped with a 3/4 in. (19mm)
outside diameter blower tube which carries
Since the drifter is hydraulic, there are only hole cleaning air from the inlet connection in
two moving parts to control hammer action: the the backhead, through the center of the drifter,
piston and the piston valve. The piston pro- striking bar, drill steel and bit to the bottom of
vides the impact force which is transmitted to the hole without contacting any of the internal
the drill steel. The valve alternately switches parts of the drifter.
pressure from supply to exhaust. This action
produces a high frequency reciprocation of
2600 cycles per minute. The piston strikes the
striking bar on each forward (power ) stroke, THE DRIFTER ACCUMULATORS
thus, transmitting the blow energy through the REQUIRE CHECKING EVERY 250
steel to the bit at 2600 blows per minute. HOURS OF OPERATION. REFER
TO SECTION 5, PARAGRAPH 19.
The hydraulically--powered rotation motor
is independently controlled and is designed to The drifter uses three nitrogen--charged
provide continuous drill steel rotation--forward diaphragm accumulators to dampen vibra-
or reverse. The motor converts hydraulic fluid tions in the supply and return hoses. The sup-
to rotation power and transmits the rotation ply line (high pressure) accumulators must be
power to the spur gear train housed in the drift- charged to 853 psi (60 kg/cm2). The return line
Page 4, Section 3, IM6036
Figure 1. Hydraulic Drifter YH80 -- Sectional Illustration
(low pressure) accumulator must be charged able for the drifter. This option helps in the re-
to 57 psi (4 kg/cm2). An accumulator charging covery of jammed bits and rods in fractured
kit is furnished as a standard accessory item ground.
with the hydraulic machine.
The drifter is designed with chuck parts to
accommodate a 6--splined striking bar. A strik-
Do not use the reverse percussion
ing bar is not furnished as standard equipment
continuously for over 10 to 15 sec-
with the drifter. The required striking bar must
onds.
be specially ordered. Refer to Table 3 for the
part number of the striking bars available for
use with the drifter and the specifications of the 13. SPECIFICATIONS.
striking bars.
Tables 1 through 5 list the specifications for
An optional reverse percussion kit is avail- the drifter.
Table 1. Drifter Specifications
U. S. Metric
Net Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 463 lb. 210 kg
Overall Length (less striking bar) . . . . . . . . . . . . . . . . . . 40.35 in. 1025 mm
Overall Width . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14.17 in. 360 mm
Overall Height . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11.61 in. 295 mm
Drill Hammer Hydraulic Operating Pressure . . . . . . . . . 1991 psi 140 kg/cm2
Hammer Blows Per Minute (variable) . . . . . . . . . . . . . . 2600 bpm 2600 bpm
Diameter of Drill Inlet Hydraulic Hose . . . . . . . . . . . . . . 3/4 in. 19 mm
Diameter of Blower Hose . . . . . . . . . . . . . . . . . . . . . . . . . 3/4 in. 19 mm
Diameter of Front End Lubrication Hose . . . . . . . . . . . . 3/8 in. 9.5 mm
Supply Accumulator Charge Pressure (Drifter) . . . . . . 853 psi 60 kg/cm2
Return Accumulator Charge Pressure (Drifter) . . . . . . 57 psi 4 kg/cm2
Supply Accumulator Charge Pressure (Reverse
Percussion) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 853 psi 60 kg/cm2
Return Accumulator Charge Pressure (Reverse
Percussion) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 853 psi 60 kg/cm2

NOTICE: This data based on hydraulic supply of 29.27 gpm (110 liters/min) at 1991 psi
(140 kg/cm2) at the inlet.

Table 2. Rotation Motor Specifications

U. S. Metric
Diameter of Hydraulic Hoses (2) . . . . . . . . . . . . . . . . . . . . . . 1/2 in. 12.7 mm
Stall Torque at Chuck . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 427 lb--ft 578 Nm
Rotation Speed at Chuck (Normal Operating Speed) . . . . 0 to 150 rpm
Maximum Chuck Rotation Speed (Free Speed) . . . . . . . . 200 rpm150 rpm150 rpm

NOTICE: This data based on hydraulic supply at 11.89 gpm (45 liters/min.) at 1991 psi
(140 kg/cm2) at the inlet.

Page 5, Section 3, IM6036

 Table 3. Striking Bar Specifications (Furnished only when specially ordered)
Striking Bar Striking Bar Specifications
SB38YH65 6--Spline Drive
(51780989) T38 Thread (Male)
For 3/4 in. (19mm) Diameter Blower Tube

SB45YH65 Same as above except with T45 Thread (Male)

(51781003)

♦ SB45SYH65RP 6--Spline Drive

(51781128) T45 Thread (Male)
For 3/4 in. (19mm) Diameter Blower Tube
NOTICE: Use 8--digit part number (51780989, 51781003, or 51781128) when
ordering the required striking bar.
♦ NOTICE: This striking bar is for use ONLY with the reverse percussion option.

Table 4. Steel (Coupled Type)

Steel Size Thread Size
1--1/2 in. (38mm) Hollow Round 1--1/2 in. (38mm) T38
1--1/2 in. (38mm) Hollow Round 1--1/2 in. (38mm) T45

Table 5. Shipping Information

U. S. Metric
Net Weight of Drifter . . . . . . . . . . . . . . . . . . . . . 463 lbs 210 kg
Shipping Weight . . . . . . . . . . . . . . . . . . . . . . . . 483 lbs 219 kg

Page 6, Section 3, IM6036

Instruction Manual IM6036
Revision 1 OPERATION Section 4
December 10, 1993 Page 1 of 5

Alphabetical Index
Title Page No.
Air Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Basic Operating Principles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Drill Piston Reciprocation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Drill Steel Rotation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Charging the Drifter Accumulators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Connecting the Striking Bar to the Drifter . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Drilling Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Drilling Tips . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Bit Care . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Drill Steel Care . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Suggestions for Drillers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Hoses and Fittings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Hydraulic Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Lubrication Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Operating Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Receiving the New Drifter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

14. INTRODUCTION. 16. HYDRAULIC REQUIREMENTS.

The hydraulic power required to operate
This section provides air requirements, op- the drifter is divided into two independent func-
erating principles, hydraulic requirements, tions:
and lubrication requirements of the Hydraulic
Drifter YH80 (hereafter referred to as drifter). a. Hammer Operation -- The hydraulic
system must be capable of supplying hydraulic
fluid to the drifter at a rate of 29.27 gpm (110
liters/min.) at 1991 psi (140 kg/cm2).
15. RECEIVING THE NEW DRIFTER. b. Drill Steel Rotation -- The hydraulic
system must be capable of supplying hydraulic
fluid to the rotation motor on the drifter at a rate
Upon receipt of a new drifter, check the
of 11.89 gpm (45 liters/min.) at 1991 psi (140
drifter model number to see that it agrees with
kg/cm2).
the parts catalog. Attention in this area will as-
sure that the correct repair parts are ordered Ingersoll--Rand hydraulic crawler ma-
when needed. chines are designed to use this hydraulic drift-
er. Basically, its hydraulic system contains a
Before releasing a new drifter for service, fluid reservoir, which stores a supply of hy-
remove all the shipping plugs from the ports. draulic oil; pumps, which develop and deliver
These plugs are used to keep dirt out of the the required hydraulic oil pressure and flow to
equipment during handling and shipping. operate the drifter and its rotation motor; filters
for removing particulate contamination from c. Forward Rotation Hydraulic Hose -- 1/2
the oil supply; control valves to initiate hammer in. (12.7 mm) diameter.
action and control the speed and direction of d. Reverse Rotation Hydraulic Hose -- 1/2
the rotation motor; and an oil cooler to maintain in. (12.7 mm) diameter.
the entire system at an optimum operating
temperature. An arrangement of hoses and fit- e. Front End Lubrication Hose -- 3/8 in.
tings carries the oil from the reservoir through (9.5 mm) diameter.
the pumps and regulating controls to the drifter
and rotation motor and back to the reservoir
through the oil cooler.
20. BASIC OPERATING PRINCIPLES.
17. LUBRICATION REQUIREMENTS. The operation of the drifter is based on two
independent basic operating principles: (a) the
The drifter uses an oil mist to provide lubri-
principle that causes the piston to reciprocate
cation to all critical points in the front end of the
(i.e., hammer action) and (b) the principle gov-
drifter. A 3/8 in. (9.5 mm) diameter hose, con-
erning the drill steel rotation.
nected to the drifter, carries the oil--laden air
from a lubricator (part of drilling machine) to
the front end of the drifter. The amount of lubri-
cation provided is controlled by the lubricator 21. DRILL PISTON RECIPROCATION.
located on the drilling machine. The drifter is a valved hydraulic drill. The
valve cylinder assembly and cylinder liner con-
vert hydraulic fluid pressure into efficient ham-
18. AIR REQUIREMENTS. mer action. The piston within the cylinder liner
provides the impact force which is transmitted
The air requirements for the drifter are for to the drill steel. The valve alternately switches
front end lubrication and hole cleaning. For pressure from supply to exhaust. This action
normal drilling conditions, a minimum flow of produces a high frequency reciprocating ac-
10 scfm (.28 m3/min.) at a pressure of 100 psi tion of 2600 cycles per minute. The piston
(7.03 kg/cm2) is required for lubrication and strikes the striking bar on each forward (pow-
the remaining air for hole cleaning. er) stroke, and through the striking bar and
steel, drives the drill bit into the rock at 2600
blows per minute.
19. HOSES AND FITTINGS.

Only quality hose designed especially for 22. DRILL STEEL ROTATION.
rock drill service should be used. It should be
constructed with an outer covering which re- The drifter is designed with an independ-
sists abrasive wear and have a working pres- ently--controlled, hydraulic--powered, rotation
sure safety factor of at least 4 to 1 in relation to motor that provides continuous drill steel rota-
burst. tion -- forward or reverse.
Hoses and hose fittings must be in good The motor converts hydraulic fluid to rota-
condition, and the fittings must be kept tight. tion power and transmits the rotation power to
The following lists the hoses required to op- a drive gear which is part of the spur gear train
erate the drifter and the diameter of each hose: housed in the drill fronthead. Thus, as the
drive gear is rotated, the meshing chuck gear
a. Inlet Hydraulic Hose -- 3/4 in. (19 mm) and mating chuck driver follow the rotation.
diameter. Splines within the chuck driver mate with those
b. Return Hydraulic Hose -- 3/4 in. (19 in the striking bar, thereby imparting the rota-
mm) diameter. tion through the drill steel to the bit.
Page 28, Section 4, IM6036
23. OPERATING CONTROLS.

Hammer action, drill steel rotation and feed

are controlled separately and each must be MAKE SURE THE ACCUMULA-
regulated for optimum results in the drilling TORS ARE IN GOOD CONDITION.
conditions encountered. All operating controls MAKE SURE THE ACCUMULA-
for the drifter are located on the drilling ma- TOR HOUSING HAS NO CRACKS
chine console. Refer to the operation section OR SIGNS OF EXCESSIVE WEAR.
of the drilling machine instruction book for de- A DAMAGED ACCUMULATOR
tailed descriptions and instructions covering COULD RUPTURE AND SEVERE-
all operating controls and gauges. LY INJURE PERSONNEL.
To charge the drifter accumulators, pro-
ceed as follows:
24. CHARGING THE DRIFTER
ACCUMULATORS. (Figure 1) a. Using a spanner wrench, remove the
protective caps from the accumulator covers
The drifter uses nitrogen accumulators to on both accumulators.
dampen vibrations in the pressure and return b. Loosen the accumulator valve slightly
hoses. Before operating the drifter, both accu- (about 1/8 of a turn).
mulators must be charged. Refer to Section 3,
c. Attach the charge valve assembly to
Table 1 for charging requirements!
the accumulator, turning the assembly hand
tight.
d. Connect the nitrogen bottle hose to the
charge valve assembly charging port.
e. Make sure the discharge valve on the
Local codes and local supply and re- side of the charging valve assembly is closed.
fill requirements prohibit Ingersoll-- (Turning clockwise closes the valve).
Rand supplying nitrogen gas cylin- f. Turn the charge valve on top of the
ders. charging valve assembly counter--clockwise
An accumulator charging kit (Figure 1) is to open the accumulator valve. Open valve
furnished as a standard accessory item with three to four turns.
the drilling machine.
The following DANGER Precautions must
be observed when charging the drifter accu-
mulators: Failure to open the accumulator
valve a full three to four turns may re-
sult in damage to the seal when the
nitrogen bottle valve is opened.
DRY NITROGEN IS THE ONLY
GAS PRODUCT TO BE USED TO g. Slowly open (turn counter--clockwise)
CHARGE THE DRILL ACCUMU- the valve on the nitrogen bottle and allow the
LATORS. NEVER USE OXYGEN pressure to build. Close the valve when the
TO CHARGE THE ACCUMULA- pressure reaches proper setting. If the pres-
TORS. IGNITION OF AN OXYGEN sure becomes higher, adjust the pressure by
AND OIL MIXTURE IN THE ACCU- using the discharge valve on the charging
MULATOR COULD PRODUCE AN valve assembly.
EXPLOSION, WHICH COULD SE- h. Close the accumulator valve by turning
VERELY INJURE PERSONNEL IN the charging valve on the charging valve as-
THE AREA. sembly.

Page 29, Section 4, IM6036

 XP3069

1. Charging Valve Assembly

2. Hose (with fittings)

Figure 1. Accumulator Charging Kit

i. Open the discharge valve to release

gas in the charging valve assembly and the
hose.
j. Remove the nitrogen bottle hose. It is very important that all threaded
accessories be properly lubricated
k. Remove the charging valve assembly. and cared for at all times. Proper lu-
brication will result in longer part life
l. Tighten the accumulator valve. Torque and will simplify threading and un-
the valve to 22 lb--ft (30 Nm). threading of all connections. Make
m. Replace the accumulator protective sure that all threads are clean and
cap. free of dirt and coated with a high
pressure grease (Ingersoll--Rand
n. Follow the same procedure to charge Drill Steel Lubricant) or equivalent
the second accumulator. The drifter is then each time they are coupled or
ready for service. stored.

b. Remove the two chuck end cap bolts

(76) and nuts (77).
25. CONNECTING THE STRIKING BAR c. Remove the chuck end cap (73), cap
TO THE DRIFTER. (Section 3, Figure 2) liner (74), and o--ring (75).
d. Make sure the striking bar is equipped
a. Make sure all striking bars and with a seal and the lip of that seal is facing the
threaded accessories are properly greased. striking bar splines.

Page 30, Section 4, IM6036

 e. Coat the striking bar with clean oil and for at all times. Steels having stripped threads,
insert the shank end of the striking bar into the cracks, or severe galling must not be used.
chuck (72). Also, care should be taken while drilling not to
f. Insert the chuck end cap liner (74), o-- bend steel or gall threads due to misuse.
ring (75) and chuck end cap (73) and secure b. Bent steel produces unnecessary
with two chuck end cap bolts (76) and nuts stresses and accelerates wear on all fronthead
(77). components. Bent steel and severe thread
galling can be avoided if the following steps
26. DRILLING PROCEDURES. are taken:

Detailed operating and drilling instructions 3. Be sure that the steel is bottomed in
are covered in the operation section of the drill- the striking bar, couplings, and bit.
ing machine instruction book. 4. All threads must be in good condi-
tion and well greased.
27. DRILLING TIPS. 5. Always drill with a sharp bit (no more
To ensure maximum operating efficiency, than 1/8 in. [3.175mm] flat on carbides). Dull
the following suggestions should be observed. bits cause excessive pounding and unneces-
sary stresses on all threads and drifter fron-
thead parts.
28. SUGGESTIONS FOR DRILLERS.
6. Approach the rock at reduced feed
a. Never pound on stuck steel. Nothing is pressure, position carefully, and collar hole.
accomplished thereby and the drifter and bit Once bit is collared in rock, full feed pressure
may be permanently damaged in the process. may be applied.
b. Never strike the drifter with tools. 7. Always keep sufficient feed pres-
c. Every effort must be made to keep dust sure on steel system. Insufficient feed pres-
and dirt from entering the drifter. Preventing sure will cause joints to loosen and threads will
impurities from entering the drifter pays off in be damaged.
improved operation and reduced down--time
8. Always maintain alignment be-
for repairs.
tween the drifter and the hole.
d. Always be sure the drifter front end
parts are well lubricated. Oil must be detected
on the striking bar for proper rotation compo- 30. BIT CARE.
nent lubrication. Adjust the oil reservoir so that
the striking bar always shows an oil film. Refer For long bit life, the instructions as listed in
to drilling machine instruction manual for time Paragraph 16 covering “Drill Steel Care” must
intervals for checking oil reservoir. Keep the also be applied to the bit. In addition, the fol-
lubricator well supplied with oil at all times. lowing steps must also be taken:
e. Always keep the drifter aligned with the a. Never allow the bit to become plugged
drill steel and hole. This assures straight and with loose cuttings. Blow the hole continu-
true holes that go in fast. Most importantly, this ously.
prevents unnecessary wear and damage to b. Never force or broach the bit into a hole.
the drill.
c. “Rattle” bits from steel using the drifter
f. Always use the centralizer to guide the
hammer action with light feed pressure and no
drill steel during the drilling operation.
rotation. Use a Stillson or bit wrench to remove
the bit. Never strike the bit with a hammer.
29. DRILL STEEL CARE.
d. Bit carbides should never be allowed to
a. It is very important that the threads of flatten any greater than 1/8 in. (3.175 mm) be-
the drill steel be properly lubricated and cared tween regrinding intervals.
Page 31, Section 4, IM6036
Instruction Manual IM6036
Revision 1 MAINTENANCE Section 5
December 10, 1993 Page 1 of 17

Alphabetical Index
Title Page No.
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Drifter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Hoses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Hydraulic System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Lubricant Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Drill Steel Thread Lubricant . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Front End Lubricating Oil (Rock Drill Oil) . . . . . . . . . . . . . . . . . . . . . . . . . 2
Hydraulic Oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Accumulator Reassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Drifter Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Drifter Reassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Hydraulic Rotation Motor Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Hydraulic Rotation Motor Reassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Inspection of Accumulator Pressures . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Inspection of Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Reverse Percussion Kit Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Reverse Percussion Kit Reassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

31. INTRODUCTION. 33. HYDRAULIC SYSTEM.

Clean hydraulic oil is the life--blood of the
This section provides information on drifter drifter. Without an adequate supply of clean
disassembly, inspection of parts, assembly in- oil of proper weight at the correct pressure and
structions and lubricant specifications of the temperature, the drill cannot operate properly.
Hydraulic Drifter YH80 (hereafter referred to e. Make sure the hydraulic oil is kept free
as drifter). of dirt. Check that all filters are properly in-
stalled and serviced regularly.
f. Hydraulic oil conforming to the specifi-
cations as outlined in the drilling machines in-
32. DESCRIPTION. struction manual.
g. Maintain the correct level of hydraulic
The drifter must be included in a definite fluid in the hydraulic oil reservoir to prevent
preventive maintenance schedule to assure overheating and foaming.
top performance and long, efficient service life. h. Make sure the system heat exchangers
The operating performance is directly depend- or radiator type oil coolers are kept free of dirt.
ent upon the condition in which the working
parts and interacting systems are maintained. 34. HOSES.
The following areas must be included in a pre-
ventive maintenance “check--list” to assure re- a. Never allow the hydraulic system hoses
liable and consistent drifter operation. to remain uncapped or exposed at any time.
Always cap hoses and fittings immediately drilling machine instruction manual for time in-
when disconnecting any part of the hydraulic tervals for checking oil reservoir. Keep the lu-
system. bricator well supplied with oil at all times. Keep
b. Make sure all hoses are clean before the lubricating oil free of dirt.
connecting them to any part of the hydraulic f. Schedule regular periods for checking
system. front end lubrication. Do not wait for physical
c. Make sure all hoses are clean before evidence of poor lubrication.
connecting them to the drifter. g. The drifter fronthead should be taken
d. Always use the proper size hoses. apart periodically, cleaned, and parts in-
spected for wear and distortion.
e. Make sure all hose connections are
tight and all hoses, fittings, and adapters are in h. Hydraulic seals and o--rings wear dur-
top--notch condition. ing normal operation. Hydraulic oil leakage
may be an indication that seals or o--rings
need to be replaced.
i. If a drifter is not operating properly, in-
vestigate the problem as described in Section
A LOOSE HOSE CONNECTION
6 covering “Troubleshooting”.
NOT ONLY CAUSES LEAKS, BUT
THE HOSE MAY COME COM-
PLETELY OFF THE TOOL, WHIP
AROUND AND CAUSE INJURY TO 36. LUBRICANT SPECIFICATIONS.
THE OPERATOR.
The following paragraphs outline the lubri-
cants required for the drifter.

35. DRIFTER.
a. Never allow the hose adapters on the 37. HYDRAULIC OIL.
drifter to remain uncapped. Dirt contamination
of the drifter will cause accelerated wear and Refer to the instruction manual for the drill-
drifter failure. ing machine for the specifications of the hy-
draulic oil.
b. Be certain that the striking end of the
striking bar is square, flat and free of all sharp
edges. The striking bar should be repaired or
discarded if cracked, peened, or crowned. 38. FRONT END LUBRICATING OIL.
(Rock Drill Oil)
c. Be sure that the hole in the drill steel is
open.
d. Excessively dull bits cause slow drilling
and excessive pounding within the drifter. Al-
ways change the bit when there is an apprecia-
ble drop off in drilling speed, or any noticeable KEEP THE ROCK DRILL LUBRI-
change in the action of the drifter. CANT CLEAN AND FREE FROM
ALL FOREIGN MATTER TO PRE-
e. Be certain that the drifter front end parts VENT DAMAGE TO THE INTER-
are well lubricated. Oil must be detected on NAL PARTS.
the striking bar for proper rotation component
lubrication. The amount of lubricating oil pro- Ingersoll--Rand offers a complete line of
vided is controlled by air and oil regulators lo- rock drill oil formulated to provide maximum
cated at the drilling control console on the drill- performance in all types of rock drill equip-
ing machine. Adjust the oil flow so that the ment. These oils exceed the oil specifications
striking bar always shows an oil film. Refer to listed in Table 1.
Page 7, Section 5, IM6036
 The rock drill oil used in the air line lubrica- sive to both steel and bronze, and contain little
tor must be a well refined petroleum lubricating or no sulphur.
oil. It must be suitably compounded to provide
the specified consistency and film strength, Ingersoll--Rand Rock Drill Oils are formu-
and be further compounded to provide the lated to provide maximum performance in all
specified steam emulsion number, which is re- types of rock drill equipment. Use Table 2 for
quired to provide satisfactory lubricant. selecting the correct viscosity grade to meet
Though the composition of the “film strength” your requirements and Table 3 for selecting
additive is not specified, it must be non--corro- the correct rock drill oil part number.

Table 1. Rock Drill Oil Specifications

Characteristic Test Below 20°F 20°F to 90°F Above 90°F

Procedure (--7°C) (--7°C to 32°C) (32°C)
Viscosity:
SUS at 100°F (38°C) ASTM--D2161175 min. 450 min. 750 min.
SUS at 210°F (99°C) ASTM--D2161 46 min. 65 min. 85 min.
cST at 104°F (40°C) ASTM--D445 37 min. 105 min. 160 min.
cST at 212°F (100°C) ASTM--D445 6 min. 11 min. 16 min.
Pour Point, °F (°C) max. ASTM--D97 --10°F --10°F 0°F
(--23°C) (--23°C) (--18°C)
Flash Point,°F (°C) min. ASTM--D92 370°F 400°F 450°F
(188°C) (204°C) (232°C)
Viscosity Index, min. ASTM--D2270 90 90 90
Steam Emulsion No. min. ASTM--1935--65 1200 1200 1200
Consistency ............ Stringy Stringy Stringy
Falex Load Test lbs (kg) [min] ASTM--D2670 2000 lbs 2000 lbs 2000 lbs
(907 kg) (907 kg) (907 kg)
Timken E.P. Test lbs (kg) [min] ASTM--D2782 30 lbs 30 lbs 30 lbs
(14 kg) (14 kg) (14 kg)

Table 2. Selection Chart

Typical Operating Below 20°F 20°F to 90°F Above 90°F

Conditions (--7°C) (--7°C to 32°C) (32°C)

100--150 psi (7.03 -- 10.5 kg/cm2) Light Medium Heavy

Table 3. Ingersoll--Rand Rock Drill Oil Part Numbers

Grade 1 Gallon 5 Gallon 55 Gallon

Light 51378701 51378727 51378743

Medium 51378693 51378719 51378735

Heavy 51378784 51378792 51378800

Page 8, Section 5, IM6036

39. DRILL STEEL THREAD LUBRICANT.

It is very important that the threads of all WHEN USING ANY SOLVENT TO
striking bars, drill rods, couplings and bits be CLEAN PARTS, MAKE SURE
properly lubricated and cared for at all times. THAT IT MEETS CURRENT
Proper lubrication will result in longer life and SAFETY AND HEALTH STAN-
will simplify threading and unthreading drill rod DARDS AND THAT IT IS USED IN
joints. AN AREA THAT IS ADEQUATELY
VENTILATED.
Use a good molybdenum di--sulphide type
thread grease such as (Ingersoll--Rand Drill
Steel Lubricant) or equivalent. (Refer to 41. DRIFTER DISASSEMBLY. (Figure 1)
PL6036 “Parts List For Hydraulic Drifter Model
YH80”, for part numbers.) a. Place the drill guide in a horizontal posi-
tion.
b. Feed the drifter down the guide until it is
in the most accessible position.
40. MAINTENANCE. c. Disconnect, plug, and tag the blower air
hose, front end lubrication hose, supply and
return hydraulic hoses, and forward and re-
To ensure maximum life and top perform- verse rotation hydraulic hoses.
ance of the equipment, it is necessary that the
maintenance be made before serious damage d. Install caps on the hose fittings to pre-
occurs. It is important to be cautious when per- vent dirt from entering the drifter.
forming any service work. A general knowl- e. Remove the nuts and bolts which se-
edge of the system and/or components is im- cure the drifter to the mounting plate, and use a
portant before the removal or disassembly of suitable hoist to lift the drifter off the mounting
any components. The following is a list of ba- plate.
sic precautions that must always be observed:
f. Take the drifter to a clean work area to
a. Never attempt major work on the drifter disassemble it.
in the field. The drifter may be in worse condi-
tion after major maintenance was tried in the
field than before. Send the drifter to the shop.
THE DRIFTER MUST BE PLACED
b. Clean the exterior of the drifter before IN A HORIZONTAL POSITION AND
tearing it down. FIXED BY BOLTS ON A WORK
BENCH FOR DISASSEMBLY. A
c. Use a soft metal, plastic, or wood ham- DRIFTER POSITIONED VERTI-
mer for driving the heavier exterior parts. CALLY COULD FALL AND CAUSE
A SEVERE CRUSHING INJURY TO
d. Handle parts carefully. Hardened parts PERSONNEL.
might chip or break if dropped on a hard sur-
face. WHEN USING ANY SOLVENT TO
CLEAN PARTS, MAKE SURE
e. Clean disassembled parts in a solvent. THAT IT MEETS CURRENT SAFE-
Probe ports in the backhead, housing, housing TY AND HEALTH STANDARDS
liner, drive gear cover, etc. to loosen and re- AND THAT IT IS USED IN AN AREA
move foreign matter. Place the small parts in a THAT IS ADEQUATELY VENTI-
clean container so they will not become lost. LATED.

Page 9, Section 5, IM6036

 Figure 1. Hydraulic Drifter YH80 -- Sectional Illustration

Page 10, Section 5, IM6036

 g. Loosen and remove the two chuck end t. Using both hands, pull the piston (35),
bolts (76) and nuts (77). valve (34), valve guide (33) and cylinder back
liner (29) the rest of the way out of the cylinder.
h. Loosen the four through--bolt nuts (78).
u. Using one of the cover bolts (66) to in-
i. Loosen the twelve bolts (46) which at-
sert into the gear shaft (62), pull the gear shaft
tach the accumulator assemblies to the cylin-
(62) out of the gear box (54). Support the idler
der (21).
gear (60) with the other hand so that it will not
j. Loosen the backhead gland (13) with drop when the gear shaft is pulled out.
an open end wrench. Pull out the backhead v. Separate the gear box (54) from the cyl-
gland and blow tube (18) in one piece. inder (21) with a plastic hammer.
w. Set the gear box (54) on its chuck side.
From the backhead side of the gear box, use a
hammer and suitable steel bar to drive the
BE EXTREMELY CAREFUL WHEN drive gear (58) and bearings (59) from the gear
REMOVING THE CHUCK END box.
CAP, CHUCK AND STRIKING BAR.
THESE PARTS MAY FALL APART x. With the gear box (54) on a suitable fix-
AND CAUSE INJURY TO PERSON- ture (cylinder side down), use a hammer and
NEL. appropriate drift to drive the front liner (36) out
of the gear box.
k. Remove the chuck end cap (73), chuck y. With the gear box (54) on a suitable
(72) and striking bar at the same time, being workbench (cylinder side up), use a hammer
careful not to drop any of the parts. and appropriate drift to drive the bushing out of
l. Unscrew and remove the four through-- the gear box.
bolt nuts (79) and pull the four through--bolts z. Unscrew the twelve bolts (46) which
(78) out of the drifter. hold the three accumulators to the cylinder and
m. Using a plastic hammer, drive off the remove the accumulators from the cylinder.
chuck end (69).
n. Pull the chuck driver (67) out of the gear
box (54).
o. Unscrew the four capscrews (53) which BE SURE TO BLEED THE ACCU-
hold the hydraulic motor (47) to the gear box MULATORS BEFORE ANY ACCU-
(54). MULATOR DISASSEMBLY IS AT-
TEMPTED.
p. Pull the hydraulic motor (47) out of the
gear box (54). aa. Put the accumulator in a vise and with a
spanner wrench remove the cap (44) from the
q. Unscrew the four bolts (66) and remove accumulator cover (40).
the cover (64) and o--ring (65).
ab. Loosen the accumulator valve (42)
r. Use two wooden blocks to support the slightly to bleed the gas from the accumulator.
cylinder so that the backhead (1) can be re-
moved with a plastic hammer. ac. Unscrew the cover (40) from the accu-
mulator body (39).
s. From the chuck end of the drifter, strike
the front surface of the piston (35) with a ham- ad. Remove the diaphragm (41) from the
mer and plastic drift. Drive the piston (35), accumulator body (39).
valve (34), valve guide (33) and cylinder back ae. Remove the two seals (28) from the cyl-
liner (29) out of the cylinder (21) until they can inder liner, seals (31, 32) from the back liner
be pulled the rest of the way out by hand. and seal wiper ring (38) from the front liner.

Page 11, Section 5, IM6036

 c. Unscrew the four bolts (16) and lift the
valve housing (12) straight up.

Do not remove the cylinder liner un-

less service is required on the liner.
af. If necessary to remove the cylinder liner If done carefully, the pins, springs,
(27), insert an appropriately sized tool into the balance plate and valve will remain
cylinder (21) and drive the cylinder liner (27) on the valve plate.
out with a large hammer or press.

d. Carefully remove the o--ring (22) from

the valve housing (12).
e. Remove the two pins (11) and springs
Do not remove any of the bushings
(10) from the balance plate (9).
unless they require servicing.
f. Remove the balance plate (9), valve
ag. Place the chuck end (69) on an appro- (8), and inner and outer face seals (24, 25).
priate fixture so that the bushing (70) can be
driven out from the chuck side of the chuck g. Lift the valve plate (7) away from the
end. geroler (5).
ah. Remove the chuck bushing (70) and h. Carefully remove the o--ring (23) from
cap liner (74) if necessary. the valve plate (7).
i. Lift the valve drive (6) out of the geroler
(5).
42. HYDRAULIC ROTATION MOTOR j. Remove the geroler (5). Be sure to re-
DISASSEMBLY. (Figure 2) tain the rollers in the outer ring if they are loose.
k. Pull the drive (4) away from the wear
plate (3).
l. Carefully remove the o--ring (21) from
Clean the exterior of the motor. the wear plate (3).
Cleanliness is extremely important m. Lift the wear plate (3) away from the
when repairing the hydraulic rotation bearing housing (1).
motor. Work in a clean area.
n. Remove the shaft face seal (20) from
a. Drain the oil from inside the motor. the wear plate (3).
b. Place the motor in a vise with the output o. Remove the o--ring (18) from the bear-
shaft down. ing housing (1).

CLAMP ACROSS THE MOUNTING

FLANGE AREA OF THE BEARING You may need a press to remove the
HOUSING (1). EXCESSIVE shaft/bearing kit from the bearing
CLAMPING PRESSURE WILL housing.
CAUSE DISTORTION. WHEN
CLAMPING, USE SOME PROTEC- p. Remove the shaft/bearing kit (2) from
TIVE DEVICE ON THE VISE, SUCH the bearing housing (1).
AS SPECIAL SOFT JAWS OR q. Use a small screwdriver to remove the
PIECES OF HARD RUBBER OR shaft oil seal (19) and dust seal (17) from the
BOARD. bearing housing (1).
Page 12, Section 5, IM6036
 31. Bearing Housing 38. Valve 45. Plug 52. O--Ring
32. Shaft/Bearing Kit 39. Balance Plate 46. Bolt 53. O--Ring
33. Wear Plate 40. Spring 47. Dust Seal 54. Outer Face Seal
34. Drive 41. Pin 48. O--Ring 55. Inner Face Seal
35. Geroler 42. Valve Housing 49. Oil Seal 56. O--Ring
36. Valve Drive 43. Plug 50. Shaft Face Seal 57. O--Ring
37. Valve Plate 44. Steel Ball 51. O--Ring

Figure 2. Hydraulic Rotation Motor -- Sectional Illustration

Page 13, Section 5, IM6036

 j. Remove the wear ring (96) from the bot-
tom cylinder (92) and wear ring (100) from the
top cylinder (97).
BE CAREFUL NOT TO DAMAGE
THE BORE OF THE BEARING k. Remove the two seals (95) from the
HOUSING. bottom cylinder (92) and seal (99) from the top
cylinder (97).
l. Strike the edge on the inside of the bot-
43. REVERSE PERCUSSION KIT tom cylinder (92) with a suitable steel bar to re-
move it from the reverse housing (87).
DISASSEMBLY. (Figure 3)
m. Place the reverse housing (87) on a
The following disassembly instructions are suitable steel sleeve so that the housing liner
for use when the drifter is furnished with a re- (88) and the top cylinder (97) can be driven
verse percussion kit. out.
a. Loosen the two nuts (91) with a wrench.
b. Loosen the eight bolts (111) which re-
tain the two accumulators (103) to the reverse 44. INSPECTION OF PARTS.
housing (87).
The operating performance of the drifter
c. Remove the nuts (91), bolts (90), re- depends on the condition in which the working
verse housing (87) and striking bar. parts are maintained. When it is necessary to
disassemble the drifter for repairs, all parts
d. Unscrew the eight bolts (111) which re-
should be inspected for wear and damage and
tain the accumulators and remove the accu-
replacement parts installed when necessary.
mulators (103).
a. Hydraulic Rotation Motor (47).
1. Clean all metal parts in clean sol-
vent and blow dry with air. Do not wipe dry with
a cloth or paper towel because lint or other
BE SURE TO BLEED THE ACCU- matter can get into the motor and cause dam-
MULATORS BEFORE ANY ACCU- age.
MULATOR DISASSEMBLY IS AT-
TEMPTED. 2. Check all mating surfaces. Replace
any parts that have scratches or burrs that
e. Clamp the accumulators in a vise and could cause leakage. Do not use a coarse grit
remove the cap (108) from the accumulator or try to file or grind these parts.
cover (104). 3. Check around the chamfered area
f. Loosen the valve (106) with a suitable of the shaft for burrs, nicks, or sharp edges that
wrench to bleed gas from the accumulator. damage seals when reassembling.
g. Unscrew the cover (104) from the accu- b. Cylinder (21).
mulator body (103) with a suitable wrench. Inspect cylinder bore for scratches,
gouges and galling; repair any of these irregu-
h. Remove the diaphragm (105) from the larities.
accumulator body (103). c. Backhead (1).
i. Using a hammer and soft drift, strike the Inspect the front face (the face that butts up
edge on the inside of the reverse piston bush- to the cylinder ) for scratches and gouges; re-
ing (102) to remove the reverse piston (101). pair any irregularities.

Page 14, Section 5, IM6036

Page 15, Section 5, IM6036
Figure 3. Reverse Percussion Kit
 d. Cylinder Liner (27), Front Liner (36), l. Drive Gear Bearings (59).
Cylinder Back Liner and Cap Liner (29). Inspect the drive gear bearings in the gear
Inspect the inside diameters of the liners box. If the bearings are worn or damaged, use
for galling, and seizure marks; repair any irreg- suitable pullers to remove them, then press in
ularities. Replace the liners if necessary. new bearings.
e. Piston (35). m. Idler Gear Bearings (61).
1. Inspect the striking face of the pis- Inspect the idler gear needle bearings in
ton to see if it is chipped. A piston with a the idler gear. If the bearings are worn or dam-
chipped striking face must be replaced. aged, use a suitable fixture to press out the
bearings, then press in new bearings.
2. Inspect the outside diameter and in-
side diameter of the piston for galling. Any n. Chuck End Bushing (70).
galling requires replacement of the piston. Inspect the chuck end bushing for pitted,
f. Gear Box (54). scraped, or worn surfaces and replace the
bushing if necessary.
Inspect the gear box faces for scratches
and gouges; repair if necessary. o. Striking Bar.
g. Gear Box Bushing (55). 1. The striking face of the striking bar
must be square, flat, and free fo all sharp
Inspect the gear box bushing for edges. The striking bar must be discarded if
pitted,scraped, or worn surfaces and replace cracked, peened, or crowned.
the bushing if necessary.
2. The tapered seating face of the
h. Drive Gear (58). striking bar must be free of cracks and sharp
Inspect the front and rear faces of the drive edges. If the face is peened to 1/16 in.
gear for scraping and wear; inspect the drive (1.59mm) deep or greater, the striking bar
gear teeth for galling, distortion, or bending; in- must be discarded.
spect the condition of the spline in the drive p. O--Rings and Seals.
gear bore. Replace the drive gear if neces- Inspect all seals and o--rings for nicks, cuts,
sary. tears and deformation and replace as neces-
i. Idler Gear (60). sary. Hydraulic seals and o--rings wear during
Inspect the front and rear faces of the idler normal operation. Hydraulic oil leakage may
gear for scraping and wear; inspect the idler be an indication that seals or o--rings need to
gear teeth for galling, distortion, or bending; in- be replaced.
spect the condition of the idler gear bore. Re- q. Bolts, Capscrews and Nuts.
place the idler gear if necessary. Inspect the threads of all bolts, capscrews
j. Chuck Driver (67). and nuts; repair as necessary.
Inspect the front and rear faces fo the
chuck driver for scraping and wear; inspect the
pawl end of the chuck driver for distortion of the 45. ACCUMULATOR REASSEMBLY.
pawl. Replace the chuck driver if necessary.
a. Clamp the accumulator body (39) into a
k. Chuck (72). vise.
Inspect the pawl end for distortion and b. Lightly lubricate each diaphragm (41)
wear; inspect the condition of the spline in the and insert them in their cavities in the accumu-
inside bore. Replace the chuck if necessary. lator body (39).

Page 16, Section 5, IM6036

c. Install the accumulator covers (40) us-
ing a suitable wrench. Torque the covers to
253 lb--ft (343 Nm).
Be sure the lip on the outside edge of
the diaphragm is properly seated in
the groove in the accumulator body.
 d. Install the seal washers (43) on the ac-
cumulator valves (42). Install the accumulator
valves on the accumulator covers (40).
Lubricate all seals (prior to installa-
e. Refer to Section 4, Paragraph 11
tion) with petroleum jelly, such as
“Charging The Drifter Accumulators” for accu-
Vaseline. Always use new seals
mulator charging instructions.
when reassembling the motor. Refer
to PL6036, “Parts List For Hydraulic
Drifter Model YH80”, for part number
46. HYDRAULIC ROTATION MOTOR of the seal kit.
REASSEMBLY. (Figure 3) 1. Reassemble in reverse order of dis-
assembly, unless otherwise noted. Refer to
Paragraph 12.
2. Alignment studs are extremely
helpful when reassembling the motor. They
KEEP DIRT AND OTHER FOREIGN can be shop made to the specifications shown
MATERIAL OUT OF THE DRIFTER. in Figure 5.
DIRT IN THE DRIFTER WILL RE-
SULT IN DAMAGE TO THE PISTON
AND OTHER INTERNAL COMPO-
NENTS.

Figure 5. Alignment Studs

Reassembly involves three steps in

the timing of the rotation motor (Re-
fer to Steps 3, 4, 5). Timing deter-
mines the direction of rotation of the
motor output shaft, and thus, the ro-
XP2024 tation direction of the drill steel and
bit. Timing parts include the geroler
(5), valve drive (6), valve plate (7),
and valve (8).

3. First Timing Step: Locate the larg-

est open pocket in the geroler (5) and mark it
on the outside edge of the geroler, proceed as
follows:
a. Install the valve drive (6) in the
Figure 4. Shaft Face Seal, Shaft Seal geroler (5).
and Dust Seal Installation b. Install the seal (23) in the groove
in the valve plate (7).

Page 17, Section 5, IM6036

c. Align the case drain holes in the valve plate (seal side toward the geroler)
geroler (5) and valve plate (7), and install the against the geroler.
 4. Second Timing Step: Locate the
slot opening in the valve plate (7) which is in
line with the largest open pocket in the geroler
(5). Lubricate all seals (prior to installa-
tion) with petroleum jelly, such as
5. Third Timing Step: Locate any Vaseline. Always use new seals
one of the side openings that goes through the when reassembling.
bottom face of the valve (8). Line up this side
Refer to Figure 3 for the correct fac-
opening with the open slot of the valve plate (7)
ing direction of the lip when installing
that is in line with the largest open pocket of the
the seals.
geroler (5). Rotate the valve (8) clockwise until
the spline teeth engage. b. Assembly Procedure for Cylinder
Seals.
1. Collapse seal as shown in Figure 8.
Push sides in as shown, then slide into bore
and position seal in groove.
INSTALL THE FACE SEALS IN THE
POSITION SHOWN IN FIGURE 6
OR THE MOTOR WILL NOT OPER-
ATE PROPERLY. DO NOT FORCE
OR BEND THE FACE SEALS. ANY
DAMAGE TO THESE SEALS WILL
ADVERSELY AFFECT THE OPER-
ATION OF THE MOTOR. MAKE
SURE THE SEALS ARE FIRMLY
Figure 7. Seal Free Form
SEATED.

Figure 8. Seal Collapsed Form

Figure 6 Inner and Outer Face Seal
Installation.

47. REVERSE PERCUSSION KIT

REASSEMBLY. (Figure 3)

a. Place oil on the housing liner (88), in-

sert the liner into the reverse housing (87) and
with a suitable fixture, drive or press the liner Figure 9. Bump
into the housing.

Page 18, Section 5, IM6036

 2. Using a tool with rounded edges, i. Place the assembled cover and dia-
firmly work the seal into its groove until the phragm on the accumulator body (103).
“bump” has disappeared and the seal sticks
j. Fix the accumulator cover wrench
out of the groove the same amount all the way
(supplied with drifter ) on the cover with the
around.
thumb screw. Screw the accumulator cover
(104) into the accumulator body (103). Torque
the cover to 253 lb--ft (343 Nm).
k. Grease the seal washer (107) and in-
Failure to remove the “bump” may stall the washer and valve (106) in the accu-
cause damage to the piston on start-- mulator cover (103).
up.
l. Screw the valve (106) into the accumu-
lator cover (103).
c. Install the new seal (99) and wear ring
(100) into the top cylinder (97) and an o--ring m. Refer to Section 3, Paragraph 11,
(98) on the O.D. of the top cylinder. Refer to “Charging The Drifter Accumulators”, for in-
Figure 3 for the correct positioning of the seal structions on charging the accumulators.
lip. n. Install the o--ring (109) and back--up
d. Apply oil to both outside and inside of ring (110) on the accumulator body (103).
the top cylinder (97) and insert the top cylinder o. Attach the accumulator assembly to the
into the reverse housing (87). Use a press or reverse housing (87) with the four bolts (111).
drive the top cylinder into the reverse housing Torque the bolts to 115 lb--ft (156 Nm).
with a suitable fixture.
e. Install the two seals (95) and wear ring
(96) into the bottom cylinder (92). Refer to Fig-
ure 3 for the correct positioning of the seal lips. 48. DRIFTER REASSEMBLY. (Figure 1)
f. Apply a coat of oil to both the outside
and inside of the bottom cylinder (92). Install
the bottom cylinder into the reverse housing
using a press or driver. KEEP DIRT AND OTHER FOREIGN
MATERIAL OUT OF THE DRIFTER.
DIRT IN THE DRIFTER WILL RE-
SULT IN DAMAGE TO THE PISTON
AND OTHER INTERNAL COMPO-
Care should be taken when pressing NENTS.
the piston into the bottom cylinder so
as not to damage the seals in the cyl- a. Except for press--fit components, parts
inder. should fit together easily. If unusual force is re-
g. Apply a coat of oil to both the outside quired, a part is out of alignment and must be
and inside of the reverse piston (101). Install corrected to prevent binding and damage.
the reverse piston in the bottom cylinder (92) b. For proper drifter assembly, it is impor-
using a suitable bushing to driver the piston in. tant that nuts and bolts be tightened to the cor-
h. Clamp the accumulator body (103) in a rect torque valves. Table 4 lists the torque val-
vise. Install the diaphragm (105) on the accu- ues of the bolts and nuts used on the drifter
mulator cover (104) and grease them. with lubricated threads.

Page 19, Section 5, IM6036

 Table 4. Torque Values (Lubricated)
TORQUE
Illustration NAME OF PART
No. U.S. (Metric)

66, Fig. 1 Cover Assembly Bolt (4) . . . . 101 lb--ft (137 Nm)
76, Fig. 1 Bolt (2) . . . . . . . . . . . . . . . . . . . . 360 lb--ft (488 Nm)
46, Fig. 1 Accumulator Assembly Bolt (12) . 180 lb--ft (244 Nm)
53, Fig. 1 Rotation Motor Capscrew (2) 101 lb--ft (137 Nm)
79, Fig. 1 Through Bolt Nut (4) . . . . . . . . 360 lb--ft (488 Nm)
40, Fig. 1 & Accumulator Cover (3) . . . . . . 253 lb--ft (343 Nm)
104, Fig. 3
42 Fig. 1 & Accumulator Valve (3) . . . . . . 22 lb--ft (30 Nm)
106, Fig. 3
111, Fig. 3 Accumualtor Assembly, Bolt (8)
(Reverse Percussion) . . . . . . 115 lb--ft (156 Nm)

h. Press a new spring pin (56) into the

gear box (54) and install a new o--ring (57)
around the pin.
Lubricate all seals (prior to installa- i. If the drive gear bearings (59) were
tion) with petroleum jelly, such as damaged, press new bearings on the drive
Vaseline. Always use new seals gear (58).
when reassembling. j. Grease the drive gear assembly and in-
stall it in the gear box (54).
c. If removed, install the cap liner (74) into k. Install an o--ring (63) on the gear shaft
the chuck end cap (73). (62).
l. Press two new needle bearings (61)
d. If removed, install the bushing set (68) into the idler gear (60), if required, and grease
into the chuck driver (67). the bearings.
e. If removed, install the gear box bushing m. Align the idler gear (60) in the gear box
(55) in the gear box (54). (54); insert the idler gear shaft (62) thru the
f. Install a new o--ring (37) and wiper ring hole in the gear box and thru the idler gear.
(38) on the front liner (36) and press the front n. Install a new o--ring (65) on the cover
liner back into the gear box (54), if the front lin- (64) and attach to the gear box (54) with four
er was removed. bolts (66). Torque the bolts to 101 lb--ft (137
g. If the chuck end bushing (70) was re- Nm).
moved from the chuck end (69), press the o. Install a new o--ring (22) in the cylinder
bushing in. (21)
Page 20, Section 5, IM6036
 v. Install the valve guide (33) into the back
liner (29) using a plastic hammer.

SPECIAL CARE IS REQUIRED w. Insert the valve (34) in the valve guide
WHEN INSTALLING PISTON (33).
SEALS (28) TO AVOID DAMAGE x. Apply oil to the back liner assembly and
TO THE PISTON WHEN THE install the assembly into the cylinder (21); drive
DRIFTER IS STARTED. the assembly in with a hammer and plastic
drift.
MAKE SURE THE LIP OF THE IN- y. Install o--rings (24) in the two through
NER SEAL FACES TO THE INSIDE bolt holes in the cylinder (21).
OF THE HYDRAULIC OIL CHAM-
z. Install the blow tube supporter (2) and
BER.
o--rings (5, 6) in the backhead (1).
p. Assembly Procedure For Piston Seals. aa. Install the backhead (1) in the cylinder
1. Install each o--ring attached to the (21). Strike the backhead lightly with a plastic
outside of the seals (28) into the grooves of the hammer.
cylinder liner (27); then install the inner seal ab. Apply oil and grease on the chuck driver
(Refer to Paragraph 17, step b). Make sure the (67) and install the chuck driver in the gear box
lip of the inner seal faces to the inside of the hy- (54).
draulic oil chamber. ac. Install the o--ring (71) on the chuck end
q. Apply oil to the outside of the cylinder (69) and insert the pilot diameter of the chuck
liner (27); use a press to insert the cylinder lin- end into the gear box (54).
er into the cylinder (21). ad. Place an o--ring (51) on the gear box
r. Rest the cylinder (21) horizontally on (54) and install the hydraulic motor (47). Install
two wooden blocks so that the gear box (54) pi- the four capscrews (53) and torque the cap-
lot diameter can be driven into the cylinder. screws to 101 lb--ft (137 Nm).

THE DRIFTER MUST BE RE-

TAINED BY BOLTS TO A WORK
After changing the piston seals, a
BENCH BEFORE THE THROUGH
stronger force will be required to in-
BOLTS ARE TORQUED.
stall the piston.

s. Apply oil to the piston (35); carefully ae. Install the four through bolts (78). In-
slide the piston into the cylinder (21). After the stall the o--rings (80) on the bolts, grease the
piston makes contact with the piston seals in threads and install the nuts (79). Make sure
the cylinder and a stronger force is noticed, a the drifter is fixed by bolts to a work bench be-
hammer and plastic drift may be required to fore torquing the nuts. Torque the nuts (79) to
drive the piston in the rest of the way. 360 lb--ft (488 Nm).
t. Install the seals (31, 32) in the cylinder af. Install the chuck (72), striking bar, cap
back liner (29); refer to Step b for installation o--ring (75) and chuck end cap (73). Install the
instructions. two bolts (76) and torque to 362 lb--ft (491 Nm).
u. Install the o--ring (30) in the groove on ag. Install the backhead gland (13) on the
the outside diameter of the cylinder back liner blow tube (18); insert them into the backhead
(29). (1).

Page 21, Section 5, IM6036

 ah. Install the three accumulator assem- Using the furnished accumulator charging
blies to the cylinder. Install the eight bolts and kit, check the accumulator pressures as fol-
torque to 180 lb--ft (244 Nm). lows:
a. Using the spanner wrench (furnished
with the drifter), remove the protective caps
49. INSPECTION OF ACCUMULATOR from the accumulator covers on both accumu-
PRESSURES. lators.
b. Loosen the accumulator valve slightly
(about an 1/8 of a turn).
c. Attach the accumulator valve assembly
THE DRIFTER ACCUMULATORS
to the accumulator, turning the assembly hand
MUST BE CHECKED EVERY 250
tight.
HOURS OF OPERATION TO MAKE
SURE THE PRESSURES ARE d. Check the pressure gauge on the accu-
CORRECT. REFER TO SECTION mulator charging assembly.
3, TABLE 1, FOR THE CORRECT
ACCUMULATOR PRESSURES e. If the accumulator pressure are incor-
AND BELOW FOR THE PROCE- rect, refer to Section 4, Paragraph 11,
DURE FOR CHECKING THESE “CHARGING THE DRIFTER ACCUMULA-
PRESSURES. TORS”.

Page 22, Section 5, IM6036

Instruction Manual IM6036
TROUBLESHOOTING Section 6
December 17, 1992 Page 1 of 3

Alphabetical Index
Title Page No.
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

50. INTRODUCTION. 51. TROUBLESHOOTING.

Troubleshooting will be accomplished by
This section contains detailed information using the table provided in this section. Table 1
for troubleshooting the Hydraulic Drifter YH80 will provide a step by step question and reme-
(hereafter referred to as drifter). dy. Using both of these together will solve
most common problems.

Table 1. Troubleshooting

TROUBLE PROBABLE CAUSE REMEDY

Drifter will not start. 1. Cold hydraulic oil or 1. Never use hydraulic oil that does
wrong hydraulic oil. not conform to the specifications
outlined in Section 5, Table 1. If
ambient temperature is below 32°F
(0°C), drill may be reluctant to
start, but it will start if control valve
is left in the on position for a few
minutes.
2. Drifter valve stuck. 2. Check valve for scoring, burrs, or
mechanical interference. Repair or
replace.

Drifter lacks power 1. Low hydraulic oil flow. 1. Increase flow setting.
(hydraulic supply 2. Leaking seals or o--rings. 2. Check for tightness of hardware. If
pressure normally necessary, visually inspect seals.
above 1991 psi
[140 kg/cm2]). 3. Piston not hitting striking 3. Check for excessively worn striking
bar at full blow. bar splines or striking bar seat and
replace if necessary. Replace
striking bar if shank end is exces-
sively worn.

Through bolt 1. Uneven tension on nuts 1. Nuts must be tight and under equal
breakage. or loose nuts. tension. Tighten the nuts gradually
and alternately. Apply 325 lb--ft.
(441 Nm) of torque to nuts.
 Table 1. Troubleshooting (cont.)

TROUBLE PROBABLE CAUSE REMEDY

No steel rotation 1. Steel binding in hole. 1. Sharpen or replace worn bits.

or rotation is Apply correct amount of down--
weak. pressure and keep drill, steel
and hole in alignment.
2. Worn or leaking rotation 2. Repair or replace motor.
motor.
3. Incorrectly assembled 3. Check for proper assembly of
chuck/drive gear compo- the chuck/drive gear compo-
nents or excessively worn nents and for excessively worn
components. components.
4. One through bolt broken 4. Replace broken through bolt.
causing chuck end binding. Apply 360 lb--ft (488 Nm) of
torque to both nuts.

Slow drilling speed. 1. Dull bit. 1. Replace bit.

2. Cuttings not being removed 2. Increase blow air or water to
from hole. keep bit working on fresh rock.
3. Plugged drill steel. 3. Remove drill steel, clean out
passages.
4. Drifter and steel not aligned 4. Check alignment while drilling to
with hole; steel or bit bind- prevent binding and to avoid
ing in hole. stuck steel.
5. Worn fronthead compo- 5. Check chuck end components
nents. and replace if necessary.

6. Incorrect feed pressure. 6. Adjust feed pressure.

7. Accumulators not properly 7. Bleed and recharge
charged. accumulators.

Stuck steel. 1. Driving steel after bit is dull 1. Don’t force a dull bit, sharpen or
or has lost its gauge. replace with new bit.
2. Crowding bit in soft forma- 2. Use down--pressure cautiously
tions. in soft formations; be certain
steel is rotating freely.
3. Cuttings not being blown 3. Use blow air continuously.
from hole.
4. Misalignment of steel with 4. Keep drill steel, and hole in
hole causing binding. alignment at all times.

Page 23, Section 6, IM6036

 Table 1. Troubleshooting (cont.)

TROUBLE PROBABLE CAUSE REMEDY

Chipping or 1. Bad striking bar which is 1. Take bad striking bar out of ser-
breakage of too hard or rounded on end vice -- one bad striking bar can
piston. allowing minimum contact damage other parts.
with piston striking face.
2. Worn chuck end compo- 2. Replace worn components.
nents which permit striking
bar to cock in chuck so that
piston strikes shank a
glancing blow.

Page 24, Section 6, IM6036

Instruction Manual IM6036
MAINTENANCE RECORDS AND NOTES Section 7
December 17, 1992 Page 1 of 4

Date Run Time Work Performed Qty Work

(Hours) By
 Date Run Time Work Performed Qty Work
(Hours) By

Page 25, Section 7, IM6036

Date Run Time Work Performed Qty Work
(Hours) By

Page 26, Section 7, IM6036

 NOTES

Page 27, Section 7, IM6036

83. Chuck End 93. O--Ring
84. O--Ring 94. Ring, Back--up
85. Bushing 95. Seal
86. Chuck 96. Ring, Wear
87. Housing, Reverse 97. Cylinder, Top
88. Liner, Housing 98. O--ring
89. O--ring 99. Seal
90. Bolt 100. Ring, Wear
91. Nut, Nylon 101. Piston
92. Cylinder, Bottom 102. Bushing, Piston
103. Body, Accumulator
104. Cover, Accumulator
105. Diaphragm
106. Valve
107. Washer, Seal
108. Cap
109. O--Ring
110. Ring, Back--up
111. Bolt
Atlas Copco Drilling Solutions, Inc. A Company Within the Atlas Copco Group
P.O.Box 462288, 2100 North First Street Phone: +1 972-496-7400
Garland, Texas 75046-2288 Fax: +1 972-496-7425
www.atlascopco.com/drillingsolutions info.acds@atlascopco.com