TM 9-2320-361-34
15-38.
BORING CASE MAINTENANCE
THIS TASK COVERS:
a. Auger Rack Bar Removal
e.
Boring Gear Assembly
b. Boring Gear and Case Removal
f. Boring Gear and Case Installation
c. Boring Gear Disassembly
g.
Auger Rack Bar Installation
d.
Cleaning, Inspection, and Repair
INITIAL SETUP
APPLICABLE MODELS
M764
TOOLS
General mechanic’s
tool kit (Appendix
B, Item 1)
Mechanical puller kit (Appendix B, Item 22)
Dial indicator (Appendix B, Item
21)
Inside micrometer (Appendix B, Item 16)
Outside micrometer (Appendix
B, Item
17)
Two puller screws (Appendix F, Item 216)
Lifting device
Two screws (Appendix F, Item 215)
Two washers (Appendix F, Item 270)
MATERIALS/PARTS
Shim set, rack carrier bearings
(Appendix F, Item 246)
Shim set, rack feed idler gear bearings
(Appendix F, Item 247)
Shim set, rack drive gear
(Appendix F, Item 248)
Shim set, rack carrier upper nut
(Appendix F, Item 245)
Seal retainer (Appendix F, Item 204)
Seal (Appendix F, Item 223)
Two cotter pins (Appendix F, Item 9)
Twelve lockwashers (Appendix F, Item 140)
Lockwasher (Appendix F, Item 137)
Ten lockwashers (Appendix F, Item 127)
Nine lockwashers (Appendix F, Item 142)
MATERIALS/PARTS (CONTD)
Lockwasher (Appendix F, Item 150)
Two felt pads (Appendix F, Item 26)
GAA grease (Appendix C, Item 8)
Safety wire (Appendix C, Item 31)
PERSONNEL REQUIRED
Two
REFERENCES (TM)
LO 9-2320-209-12-1
TM 9-214
TM 9-2320-361-10
TM 9-2320-361-20
TM 9-2320-361-34P
EQUIPMENT CONDITION
.
Parking brake set (TM 9-2320-361-10).
●
Integral derrick removed (para. 15-36).
●
Snatch sleeve removed (TM 9-2320-361-20).
GENERAL SAFETY INSTRUCTIONS
●
Ensure auger rack bar is properly balanced on
chain during removal and installation.
●
All personnel must stand clear during lifting
operations.
●
Support boring case before removing hardware.
●
Ensure lifting capacity is greater than weight of
boring gears.
I
a. Auger Rack Bar Removal
1. Remove six screws (4), lockwashers (3), and derrick tube base (2) from boring
case
(16).
Discard
lockwashers (3).
2. Remove setscrew (7), lockwasher (6), retaining pin (5), and auger rack bar guide (8) from auger rack
bar (1). Discard lockwasher (6).
3. Install chain on auger rack bar (1). Attach lifting
device to chain.
WARNING
Ensure auger rack bar is balanced on chain during removal. Failure
to do so may cause auger rack bar to slip from chain, causing injury
to personnel or damage to equipment.
NOTE
Assistant will help with step 4.
4. Feed auger rack bar (1) out of boring case (16) until it disengages (TM 9-2320-361-10).
15-130