TM 9-2350-256-20
3-2.1 EMERGENCY BOOM OPERATION
THIS TASK COVERS
a. General
b. Preparation for Operation
CHAPTER 3: MAINTENANCE OF ENGINE
c. Operation
d. After Operation
INITIAL SET-UP
Tools:
Tool kit, general mechanic’s (Appendix C,
item 53)
Material / Parts:
Hose (Appendix C, item 18.2)
Hose (Appendix C, item 18.3)
Hose (Appendix C, item 18.4)
Sealant tape (Appendix D, item 29)
Equipment Condition:
Air inlet grilles removed (see paragraph 9-57)
Hydraulic connections access cover removed (see
paragraph 9-7)
Air cleaner removed (see paragraph 4-25)
a. GENERAL
1
In the event of a power loss to both main engine and auxiliary, power unit, the hoisting boom assembly has no
RAISE/STOW capabilities. If the boom is in the STOWED position, it is impossible to perform engine deck
removal/powerpack maintenance.
The hoisting boom assembly should NEVER be lifted to the raised position by means of winching the
boom with another vehicle. Boom could free-fall resulting in possible death or injury to personnel.
2
It should be stressed that removal of the hoisting boom assembly takes about two hours and requires a crane
for lifting off, but removal is the best method for performing maintenance from a safety aspect.
3
Should operation of the boom be considered necessary, the following emergency operation procedure could
be applied using an M88A1 Recovery vehicle as the slaving vehicle.
b. PREPARATION FOR OPERATION
CAUTION
Ensure that both vehicles have the same type of hydraulic fluid.
NOTE
Steps 1 thru 3 apply to the inoperable vehicle.
1 Disconnect hose (1) from hydraulic connections panel port 85 (2).
2 Disconnect hose (3) from quick disconnect (4).
3 Disconnect hose (5) from APU pressure switch (6).
3-14.4
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