TM 9-2320-260-34
16-35. BOOM EXTENSION CYLINDER MAINTENANCE (M819)
THIS TASK COVERS:
c. Repair
a. Removal
b. Cleaning and Inspection
d. Assembly
PERSONNEL REQUIRED
APPLICABLE MODELS
Two
M819
REFERENCES (TM)
TOOLS
LO 9-2320-260-12
General mechanic's tool kit
TM 9-2320-260-10
(Appendix B, Item 1)
Snapring pliers (Appendix B, Item 130)
TM 9-2320-260-20
TM 9-2320-260-34P-2
MATERIALS/PARTS
EQUIPMENT CONDITION
Four cotter pins (Appendix D, Item 17)
Two compression cups (Appendix D, Item 51)
Crane boom removed (para. 16-34).
O-ring (Appendix D, Item 268)
Wiper ring (Appendix D, Item 345)
Felt washer (Appendix D, Item 529)
O-ring (Appendix D, Item 269)
Hydraulic oil (Appendix C, Item 20)
1. Remove four cotter pins (4) from slotted nuts (5). Discard cotter pins (4).
2. Remove four nuts (5) from studs (1) on cylinder flange (2).
NOTE
Assistant will help with steps 3 through 5.
3. Holding cylinder head (6), slide cylinder (3) off piston rod (13).
4. Remove two nuts (7), expander (8), compression cup (9), spacer (10), compression cup (11), and
expander (12) from piston rod (13). Discard compression cups (11).
5. Remove cylinder head (6) from piston rod (13).
6. Remove O-ring (14) from outside of cylinder head (6). Discard O-ring (14).
7. Remove snapring (19), washer (18), wiper ring (17), felt washer (16), and O-ring (15) from bore of
cylinder head (6). Discard wiper ring (17), felt washer (16), and O-ring (15).
b. Cleaning and Inspection
1. For general cleaning instructions, refer to para. 2-8.
2. For general inspection instructions, refer to para 2-9.
3. Inspect cylinder (3) for bends, cracks, and broken welds.
4. Inspect cylinder (3) bore for scratches, scoring, rust, and corrosion.
5. Inspect piston rod (13) for bends, nicks, scratches, scoring, damaged threads, rust, corrosion, and
broken welds.
6. Inspect cylinder head (6) for cracks, broken snapring lip, rust, and corrosion.
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