TM 5-3800-205-10-2
THEORY OF OPERATION - CONTINUED
0003 00
ENGINE - CONTINUED
3.
Cooling System. The cooling system consists of a belt-driven circulating water pump, 165F-210F (74C-99C) ther-
mostat for controlling coolant flow, engine-driven fan, oil cooler, and radiator. The cooling system cools the engine by
circulating pressurized ethylene glycol based coolant through the engine and radiator.
OUTLET TO
CYLINDER
RADIATOR
THERMOSTAT
HEAD
BYPASS
HOSE
THERMOSTAT
(PARTIALLY OPEN)
THERMOSTAT
HOUSING
BYPASS HOSE
RADIATOR
CYLINDER
WATER
BLOCK
OIL
PUMP
WATER PUMP
COOLER
390-405
00697239
Lubrication System. The engine lubrication system consists of a gear-driven oil pump, oil filter, oil cooler, and oil pan.
4.
The engine is lubricated by cooled and pressurized oil which is circulated through the engine block and head.
5.
Exhaust System. The exhaust system removes exhaust gases from the engine through the exhaust manifold and turbo-
POWER TRAIN
1.
General. Power from the engine is sent to the torque converter. The converter output is connected to the upper drive
shaft that moves the power to the six-speed powershift transmission. The transmission is connected to transfer gears that
direct the power via the lower drive shaft to the differential in the drive axle. The differential and drive axles provide the
power to the planetary carriers in the left and right final drives.
2.
Transmission. The transmission has six hydraulically activated clutches that provide six speeds forward and one speed
reverse. The speed and direction are manually selected.
3.
Transfer Gears. The transfer drive gear receives power from the transmission output and transfers the power via a
transfer gear and shaft to the drive shaft yoke that is connected to the lower drive shaft. The transfer also mounts the
parking brake actuator, drum, and shoes.
4.
Differential. The differential divides the balance of power that is sent to the final drives and wheels. When the machine
is turning, the differential allows the inside wheel to turn at a slower rate than the outside wheel. However, the differen-
tial still sends the same torque to each wheel.
5.
Differential Lock. The differential lock is utilized when maximum traction is needed. The operator engages the differ-
ential lock by pressing down and holding the differential lock pedal. This in turn allows air pressure to engage the lock;
when the pedal is released, internal springs will disengage the lock. The differential lock should never be engaged when
one tractor wheel is spinning or when operator is turning (steering) machine; this action would result in damage to the
differential assembly.
0003 00-2
