TM 9-2320-260-34-2
16-19. INNER BOOM MAINTENANCE (M816) (Contd)
NOTE
Assistant will help with steps 10 through 13.
WARNING
All personnel must stand clear during lifting operations. A
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swinging or shifting load may cause injury or death to personnel.
Ensure lifting capacity is greater than weight (700 lb (318 kg))
of inner boom. Failure to do so may result in injury to personnel
or damage to equipment.
10. Install chain sling, spreader bar, and lifting device on inner boom (2).
11. Raise inner boom (2) slightly from blocking and position on side. Use prybar in pin hole (1) to aid
in turning.
12. Remove lifting device, chain sling, and spreader bar from inner boom (2).
c. Cleaning and Inspection
1. For general cleaning instructions, refer to para. 2-8.
2. For general inspection instruction, refer to para 2-9.
3. Inspect two sheave(s) (6) for bends, cracks, breaks, and wear. Measure inside diameter of
bushing (15). Replace bushing(s) (15) if inside diameter exceeds 1.506 in. (38.25 mm). Replace
sheave(s) (6) of bent, cracked, broken, or worn.
4. Inspect extension cylinder (14) for cracks, bends, dents, and signs of leaks.
5. Inspect inner boom (2) for bends, cracks, and wear. Repair by welding TM 9-237. Replace inner
boom (2) if damaged.
Perform steps 1 through 3 if assembling new inner boom.
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Assistant will help with steps 1 through 3.
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Install chain sling, spreader bar, and lifting device on inner boom (2).
1.
2. Position inner boom (2) on blocking as shown. Use prybar in pin hole (1) to aid in turning.
3. Remove lifting device, chain sling, and spreader bar from inner boom (2).
4. Install four tracks (4) on inner boom (2) with one hundred four screws (3).
NOTE
Assistant will help with steps 5 through 11.
5. Install chain sling, spreader bar, and lifting device on inner boom (2).
6. Position inner boom (2) upright on blocking. Use pry bar in pin hole (1) to aid in turning.
7. Remove lifting device, chain sling, and spreader bar from inner boom (2).
8. Install chain sling, spreader bar, and lifting device on extension cylinder (14).
9. Aline piston trunnion head (16) with pin hole (1) in inner boom (2) and insert extension cylinder (14)
until contact is made with chain sling.
10. Position jack stand under base of extension cylinder (14).
11. Remove chain sling and spreader bar from extension cylinder (14). Continue to insert extension
cylinder (14) into inner boom (2) until holes of piston trunnion head (16) and inner boom (2)
are alined.
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