COOLING SYSTEM - TM-9-2350-238-20-10019

TM 9-2350-238-20-1

Transmission. The transmission is an Allison XTG-41 -2A crossdrive that combines trans-

mission, steering, and 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.

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.

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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