TM-9-2350-238-20-1

HULL AND RELATED COMPONENTS RECOVERY VEHICLE, FULL TRACKED: LIGHT, ARMORED, M578

TECHNICAL MANUAL; UNIT MAINTENANCE MANUAL

MAY 1994
TM-9-2350-238-20-1

  TM-9-2350-238-20-1 - Page 19 of 1364

TM 9-2350-238-20-1
c.
Transmission.
mission, steering, and
The transmission is an Allison XTG-41 -2A crossdrive that combines trans-
braking. Steering is controlled by linkage from the steering bar that moves
hydraulic controls in the transmission.
Braking is controlled by the service brake pedal and linkage
that moves disks in the transmission.
d.
Power
takeoff assembly.
The power takeoff transfers power from the transfer assembly to
the auxiliary drive. An idler gear mates with the transfer gear and drives the output gear. The
output gear is connected to a drive shaft connected to the auxiliary drive.
COOLING SYSTEM
The engine is liquid-cooled by a cooling system with two radiators. The engine and powerplant
components are also cooled by exhaust air from the radiator vaneaxial fan. The generator is cooled
by an air intake assembly. Drawing air from the driver’s compartment, the fan forces air through the
generator into the powerplant compartment.
a.
Coolant (water) pump.
The coolant (water) pump takes coolant from the bottom of both
radiators and the surge tank and forces it around the oil cooler core into the engine water jackets.
At normal operating temperatures, the coolant passes through the thermostats to the radiators and
surge tank. Below normal operating temperature, the thermostats close, causing coolant to flow
through the by-pass tube back to the water pump intake.
b.
Surge tank.
Air is collected in the surge tank from the radiators and engine water pump
elbow. Air is vented through the surge tank cap at 14 psi (97 kPa). Air is vented through the
radiator caps at 20 psi (138 kPa).
c.
Aeration detector.
An aeration detector, by means of a float-operated switch, senses low
coolant level in the cooling system. It lights a warning light in the driver’s compartment and sounds
the warning horn to alert the driver.
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