TM 5-3805-258-24-1
P O W E R T R A IN
S Y S T E M S O P E R A T I O N
TRANSMISSION HYDRAULIC SYSTEM
SCHEMATIC OF HYDRAULIC SYSTEM
1.011 Pump bleed line.
8. Torque converter.
2.011 pump.
9. Caee for torque
3.011 filter.
converter.
4, Tranamiseion hydraulic
10. Inlet line to torque
controls.
converter.
5. Tranamiaeion ceae.
11. Caae for output tranafer
8. Outlet line from torque
gears.
converter.
7. Flywheel housing.
The hydraulic system has a common reservoir.
The reservoir is at the bottom of case (11) for the
output transfer gears. It supplies oil for the operation
of the torque converter and transmission. It also gives
lubrication oil for the different components in the
system.
Oil is pulled from the reservoir through magnetic
screen (17) by oil pump (2). Bleed line (1) goes from
pump (2) to relief valve for converter outlet (13).
When the engine is first started, line (1) lets any air
in the suction section of the pump go out of the pump.
The operation of the pump starts faster. After the
engine is running, line (1) lets a specific amount of oil
go to relief valve (13).
Pump (2) sends pressure oil to oil filter (3). The oil
goes through the filter. If restrictions are present in
the oil filter, a bypass valve in the filter housing lets
the oil go around the filter.
12. Oil cooler.
15. Return line (from
13. Relief valve (for
flywheel housing).
converter outlet).
18. Supply line to oil pump.
14. Outlet line (from oil
f7. Magnetic acraen.
cooler).
From filter (3), the oil goes to transmission hy-
draulic controls (4). The transmission selector and
pressure control valve (part of the transmission hy-
draulic controls), controls the pressure and flow of
the oil to the transmission clutches for engagement.
It also controls the inlet oil to the torque converter.
Inlet oil, for operation of the torque converter, goes
through line (10). The inlet pressure valve for the
torque converter (part of the selector and pressure
control valve) controls the oil pressure to the con-
verter. Leakage oil inside the torque converter is for
lubrication of the internal components. After lubri-
cation of the components, oil goes to the bottom of
torque converter case (9). A passage at the bottom of
converter case (9) lets the oil go to the bottom of
transmission case (5). The transmission case also has
a passage at the bottom that lets all the oil go to the
main reservoir in case (11).
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