TM 9-2350-238-10
EMERGENCY OPERATION OF CRANE
AND SPADE–CONTINUED
RELEASING BOOM WINCHBRAKE
Releasing boom winch brake will allow a
suspended load to be lowered and boom
winch wire rope to be unwound from winch
drum.
1
2
3
4
5
Make sure all personnel stand
clear of any suspended load
when releasing boom winch
brake.
Pull boom winch brake pressure selector
valve (1) out. Place winch shift lever (2)
in neutral.
NOTE
Operate hydraulic ram hand
pump slowly to control descent
. rate of load.
Operate hydraulic ram hand pump (3)
slowly until boom winch brake is re-
leased and load is lowered to ground.
Disconnect wire rope from load.
Roll up wire rope and stow securely on
vehicle deck.
Push brake pressure selector valve (1) in
when load is on ground and wire rope is
secure. This will set winch brake.
LOWERING BOOM
1 If a load is supported by boom, release
boom winch brake before attempting to
lower boom. Refer to page 2-88.
2 Remove two screws (1) and washers (2)
securing cover (3) over boom cylinder
bypass valve and remove cover. The
cover is on deck behind and to left of .
rigger’s seat.
2-88
