TM 9-2320-260-34-2
16-18. BOOM ASSEMBLY REPLACEMENT (M816) (Contd)
b. Installation
NOTE
Two assistants will help with this procedure.
1.
Install guide line around inner boom (1).
Wrap chain around lower boom roller (4) and inner boom (1) to hold inner boom (1) in position.
2.
Install two chains on brackets (3) and boom (2) and attach to lifting device.
3.
WARNING
All personnel must stand clear during lifting operations.
q
A swinging or shifting load may cause injury to personnel.
q Keep hands clear of boom and boom support when installing
boom. Use tanker or prybar to maneuver and aline boom into
position. Failure to do so may cause injury to personnel.
Ensure lifting capacity is greater than weight (2850 lb (1300 kg))
of boom assembly. Failure to do so may result in injury to per-
sonnel or damage to equipment.
NOTE
Apply a light coat of GAA grease to trunnions of boom and boom
support, shaft pin, and sheave prior to installation.
4.
Raise boom (2) from blocking. Direct assistants to guide boom (2) into position over boom
support (13) and vehicle.
Using drift, aline boom (2) in boom support (13).
5.
Using hammer and drift, install sheave (15) and shaft pin (12) in boom support (13) and boom (2).
6.
Install new locknut (14) and two grease fittings (11) on shaft pin (12). Tighten locknut (14)
7.
800-1000 lb-ft (1085-1356
Direct three assistants to raise elevating cylinders (10). Lower boom (2) and position elevating
8.
cylinders (10) on brackets (5) and boom (2).
Install elevating cylinders (10) on brackets (5) and boom (2) with two keeper pins (6),
9.
washers (9), new lockwashers (7), and screws (8).
Lower boom (2) and remove lifting device, chains, and guide line from boom (2).
10.
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