TM 9-2320-260-34-2
16-19. INNER BOOM MAINTENANCE (M816) (Contd)
NOTE
Two assistants will help with step 7.
q
It may be necessary to loosen adjustments of upper, lower, and
q
inner boom rollers to ease installation of inner boom.
7. Direct assistants to remove inner boom (2) from boom (1) until 18 ft (5,49 m) mark is reached. Place
jack stand under rear of inner boom (2).
8. Remove lifting device and chain from inner boom (2).
9. Install chain sling, spreader bar, and lifting device on inner boom (2).
10. Remove inner boom (2) from boom (1) and place on blocking,
11. Remove lifting device, chain sling, and spreader bar from inner boom (2).
b. Disassembly
1.
Remove cotter pin (3) and pin (13) from extension cylinder (14) and inner boom (2). Discard cotter
pin (3).
NOTE
Assistant will help with steps 2 through 6.
Partially remove extension cylinder (14) from inner boom (2). Install one leg of chain sling to
2.
extension cylinder (14) and attach to lifting device.
3. Continue removing extension cylinder (14) from inner boom (2) and place on jack stand.
4. Reposition chain sling on extension cylinder (14) and spreader bar and attach to lifting device,
Remove extension cylinder (14) from inner boom (2).
5.
6. Remove lifting device, chain sling, and spacer bar from extension cylinder (14).
7. Remove two locknuts (8), screws (10), and spacers (9) from inner boom (2). Discard locknuts (8).
8. Remove two grease fittings (11), cotter pin (7), and shaft (12) from inner boom (2). Discard cotter
pin (7).
9. Remove two washers (4), sheaves (5), and spacer (6) from inner boom (2).
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