TM 9-2320-260-34-2
16-33. BOOM LIFT CYLINDER MAINTENANCE (M819)
THIS TASK COVERS:
d. Repair
a. Removal
e. Assembly
b. Disassembly
c. Cleaning and Inspection
lNITIAL SETUP
PERSONNEL REQUIRED
APPLICABLE MODELS
Two
M819
REFERENCES (TM)
TOOLS
LO 9-2320-260-12
GeneraI mechanic's tool kit
TM 9-2320-260-10
(Appendix B, Item 1)
14-in. pipe wrench (Appendix B, Item 129)
TM 9-2320-260-20
TM 9-2320-260-34P-2
1-5/8-in. open-end wrench
EQUIPMENT CONDITION
1-11/16-in. open-end wrench
Remove lift cylinder check valve (para. 16-38).
Bushing driver (Appendix B, Item 131)
Remove spare tire (TM 9-2320-260-10).
Remove cab side window (TM 9-2320-260-20).
Chain
Drain hydraulic oil tank (LO 9-2320-260-12).
Lifting device
MATERlALS/PARTS
GENERAL SAFETY lNSTRUCTIONS
Two Cotter pins (Appendix D, Item 17)
l All personnel must stand clear during lifting
Seal (Appendix D, Item 408)
operations.
Seal (Appendix D, Item 409)
l Ensure lifting capacity is greater than weight of
Seal (Appendix D, Item 410)
boom lift cylinder.
Seal (Appendix D, Item 412)
Seal (Appendix D, Item 413)
Lubricating oil (Appendix C, Item 20)
GM grease (Appendix C, Item 14)
1.
Raise boom (6) to maximum height and hold with hoist or securely block. Maximum angle is
41 degrees (TM 9-2320-260-10),
2.
Loosen two jamnuts (2) and remove two setscrews (1) from boom trunnions (3).
Drive out pivot shaft (8) from boom (6) and trunnion (4) on piston rod (5).
3.
4.
Remove elbow (14) and pipe (15) from elbow (16).
5.
Remove elbow (16) and nipple (17) from lower port (20) of lift cylinder (22).
6.
Remove hose (13) from tube (24) and elbow (12).
Remove elbow (12) and nipple (11) from port (10) in cylinder head (9).
7.
Attach chain to lift cylinder (22) and lifting device. Take up slack in chain.
8.
NOTE
Assistant will help with steps 9 and 10.
9.
Remove cotter pin (23) and pivot pin (19) from lower trunnion of Iift cylinder (22) and boom support
bores (21). Discard cotter pin (23).
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