TM-9-2320-361-34
2-1/2-TON, 6x6, M44A2 SERIES TRUCKS (MULTIFUEL)
TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE
MAY 1992
TM-9-2320-361-34 - Page 437 of 764
TM 9-2320-361-34
15-36.
INTEGRAL DERRICK MAINTENANCE
THIS TASK COVERS:
a.
Removal
c. Installation
b. Inspection
INITIAL
SETUP
APPLICABLE MODELS
REFERENCES (TM)
M764
TM 9-2320-361-10
TOOLS
TM 9-2320-361-34P
General mechanic’s tool kit
EQUIPMENT CONDITION
(Appendix B, Item 1)
●
Parking brake set (TM 9-2320-361-10).
MATERIALS/PARTS
●
Outrigger arms lowered (TM 9-2320-361-10).
. Derrick sheave removed (para. 15-37).
GAA grease (Appendix C, Item 8)
Three locknuts (Appendix F, Item 105)
GENERAL SAFETY INSTRUCTIONS
PERSONNEL REQUIRED
●
Do
not
lower
derrick below horizontal position.
. Derrick tube is heavy. Provide adequate support
Two
when removing or installing derrick tube.
WARNING
.
During removal and installation, only two teeth of worm leveling
gear support derrick in horizontal position. Do not lower derrick
below horizontal or derrick may fall and cause injury or death to
personnel.
●
Derrick
tube is heavy. Provide adequate support for derrick tube
during removal and installation over rack bar. Failure to do so
may result in injury or death to personnel.
NOTE
Before removal of derrick, ensure there is 20 ft (6 m) clearance to
the right of vehicle and 6 ft (2 m) clearance to the left of the vehicle.
a. Removal
1. Lower derrick (7) to near horizontal and manually turn horizontal leveling worm gearshift (1) until
derrick (7) is horizontal (TM 9-2320-361-10). Worm gear (10) will hold two teeth of worm wheel (9).
CAUTION
Do not feed rack bar more than 6 ft (2 m) from bottom of boring case
while in horizontal position. Weight of rack bar may cause damage
to pinions in boring gearcase.
2. Feed
auger rack bar (8) 5 ft (1.5 m) out of derrick (7) (TM 9-2320-361-10).
NOTE
Assistant will help with step 3.
3. Loosen three locknuts (4) and screws (3) and remove derrick tube bar (5) from base (2) and auger
rack bar (8). Discard locknuts (4).
15-126
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