TM-9-2320-260-34-2
TRUCK, 5-TON, 6X6, M809 SERIES (DIESEL)
TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE; VOLUME 2 OF 2
JULY 1994
TM-9-2320-260-34-2 - Page 613 of 863
16-35. BOOM EXTENSION CYLINDER MAINTENANCE (M819)
THIS TASK COVERS:
a. Removal
c. Repair
b. Cleaning and
Inspection
d. Assembly
APPLICABLE MODELS
M819
TOOLS
General mechanic’s tool kit
(Appendix B, Item 1)
Snapring pliers (Appendix B, Item
130)
MATERIALS/PARTS
Four cotter pins (Appendix D, Item 17)
Two compression cups (Appendix D, Item 51)
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)
PERSONNEL REQUIRED
Two
REFERENCES (TM)
LO 9-2320-260-12
TM 9-2320-260-10
TM 9-2320-260-20
TM 9-2320-260-34P-2
EQUIPMENT CONDITION
Crane boom removed (para. 16-34).
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.
16-214
TM 9-2320-260-34
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