TM 9-2320-260-34-2
16-18. BOOM ASSEMBLY REPLACEMENT (M816) (Contd)
CAUTION
Clean area around hoses and lines before removal to prevent
q
entry of dirt. Damage will occur if dirt or dust enters system.
Cap or plug all openings immediately after disconnecting lines
q
and hoses to prevent contamination. Remove caps or plugs
prior to installation. Failure to do so may result in damage to
equipment.
NOTE
q Tag all lines and hoses for installation.
q Have drainage container ready to catch hydraulic fluid.
Disconnect two hoses (4) from lines (1).
6.
Disconnect two hoses (3) from elbows (2).
7.
8.
Install two chains on brackets (6) and boom (5) and attach to lifting device.
Remove two screws (9), lockwashers (8), washers (10), keeper pins (7), and elevating cylinders (11)
9.
from brackets (6) and boom (5). Discard lockwashers (8).
Remove two grease fittings (12) and locknut (15) from shaft pin (13). Discard locknut (15).
10.
NOTE
It may be necessary to adjust lifting device to remove weight from
boom during step 11.
11.
Using hammer and drift, remove shaft pin (13) and sheave (16) from boom (5) and boom
support (14).
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 removing
boom.
q Use pry bar to maneuver boom from position. Failure to do so
may cause injury to personnel.
q 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.
12.
Install guide line around inner boom (17).
13.
Direct three assistants to support elevating cylinders (11) and guide line.
14.
Raise boom (5) from boom support (14) and elevating cylinders (11). Direct assistants to lower
elevating cylinders (11) and step away from vehicle.
NOTE
Ensure blocking is high enough to allow removal of hoist winch,
if necessary.
15.
Remove boom (5) from vehicle, and position on blocking.
16.
Remove lifting device and chains from boom (5).
17.
Remove guide line and chain from inner boom (17) and boom (5).
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