TM-9-2320-361-20
2-1/2-TON, 6x6, M44A2 SERIES TRUCKS (MULTIFUEL)
TECHNICAL MANUAL; UNIT MAINTENANCE
OCTOBER 1991
TM-9-2320-361-20 - Page 81 of 1207
TM 9-2320-361-20
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1-22. SPECIAL PURPOSE BODIES SYSTEMS OPERATION (Contd)
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c. Outrigger Hydraulic System Operation (M764).
The outrigger hydraulic system converts power of engine into fluid power by use of hydraulic pump.
At this pump, oil pressure is supplied to left and right outrigger control valves, which direct fluid pressure
to outrigger legs. Outrigger legs stabilize the vehicle for earth boring and polesetting operations. The major
components of the outrigger hydraulic system are:
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o
A
OUTRIGGER CONTROL VALVE -
Consists of two two-way valves that are located directly under
the control levers. Valves direct hydraulic oil from hydraulic pump to hydraulic outriggers and back
to hydraulic reservoir.
o
B
OUTRIGGER CONTROL LEVERS -
Manual controls attached to the control valve that regulate
hydraulic oil flow for raising and lowering outriggers.
o
C
HYDRAULIC OIL RESERVOIR -
Storage tank for hydraulic oil.
o
D
HYDRAULIC PUMP -
Draws oil from hydraulic oil reservoir and directs it to outrigger control
valve.
o
E
OUTRIGGER LATCH -
Used to support outrigger in upward position when not in use.
O
F
OUTRIGGER CYLINDER -
A hydraulically-driven piston that extends when control lever is
pushed to DOWN position and retracts when control lever is pushed to UP position. This cylinder is
contained in the upper portion of the outrigger leg.
o
G
OUTRIGGER LEG -
Two hydraulically-actuated support legs mounted on body at rear of vehicle.
Each leg consists of an upper leg, lower leg, and outrigger shoe.
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1-68
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