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 77 of 1207
TM 9-2320-361-20
1-22. SPECIAL PURPOSE BODIES SYSTEMS OPERATION
The special purpose bodies include controls, hydraulics, and their related equipment that are required to
perform specific tasks for outside construction. Each of these parts will be described as part of the following
system:
a.
b.
c.
d.
e.
f.
a.
Dump
Dump Body Hydraulic System Operation (M342A2) (page 1-64).
Earth Boring, Polesetting, and Rear Winch Systems Operation (M764) (page 1-66).
Outrigger Hydraulic System Operation (M764) (page 1-68).
Water Tank System Operation (M50A2, M50A3) (page 1-70).
Fuel Tank System Operation (M49A2C) (page 1-70).
Rear Winch and Pipeline Systems Operation (M756A2) (page 1-72).
Body Hydraulic System Operation (M342A2).
The dump body is used on M342A2 vehicles. These models are used to transport and deposit cargo.
Dump body hydraulic system converts mechanical power from transmission PTO into fluid power through
use of hydraulic pump. Pump draws oil from oil reservoir and then forces it into control valve. This
hydrualic pressure raises and lowers dump body. Major components of dump body hydrualic system are:
1-64
DUMP BODY CONTROL LEVER LOCK
- Prevents operation of dump body control lever.
DUMP BODY CONTROL LEVER
- Permits operation of dump body in four positions. It is pushed
forward to lowest position to raise dump body, raised to second lowest position to lock dump body, and
raised to third position to lower dump body. When control lever is fully raised to vertical position,
dump body is locked in position by use of a hydraulic safety latch.
HYDRAULIC RESERVOIR
- Storage tank for hydraulic oil.
CONTROL VALVE
- Four-port valve accepts pressurized oil from hydraulic pump and directs oil to
cylinder assembly.
HYDRAULIC SAFETY LATCH
- Hydraulically-operated in conjunction with dump body control
lever. Safety latch locks dump body in the lowered position and releases it when control lever is
pushed forward.
CYLINDER ASSEMBLY
- Consists of two hydraulic cylinders which raise and lower dump body
using hydraulic oil pressure.
CONTROL BOX
- Transmits motion of control rod to actuate control valve.
HYDRAULIC PUMP
- Driven by PTO propeller shaft, it draws oil from oil reservoir, then
pressurizes and directs it to control valve.
DUMP BODY CONTROL ROD
- Connects control lever to control box.
TRANSMISSION POWER TAKEOFF PROPELLER SHAFT
- Transmits power from
transmission PTO to hydraulic pump.
DUMP BODY CONTROL LINK
- Connects control valve to transmission PTO.
TRANSMISSION POWER TAKEOFF
- Attached to side of transmission to provide power for
hydraulic pump.
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