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TM 55-1905-221-14-3
a. The gear-type oil pump is mounted on the first and second main bearing caps and is gear-driven fro the front
end of the crankshaft.
b. The oil pump helical gears rotate inside a housing. The drive gear is keyed to the drive shaft which is supported
inside the housing on two bushings with a drive-driven gear keyed to the outer end of the shaft. The driven gear is
supported on the driven gear shaft which is pressed into the pump body.
c.  An integral plunger-type relief valve by-passes excess oil to the inlet side of the pump when the pressure in the
oil lines exceeds 105 pounds per square inch (724 kPa).
d. An inlet pipe, attached to the inlet opening in the pump body, leads to the inlet screen which is mounted with
brackets to a main bearing cap.
e. The inlet screen is located below the oil in the pan and serves to strain out any foreign material which might
damage the pump.
f.  The oil pump inlet screen should be removed and cleaned periodically in addition to the cleaning it receives each
time the engine is reconditioned.
g. An idler gear is mounted on a support bracket which is attached tothe pump body.
h. Pressure lubrication of the idler gear bushing is provided by means of a drilled passage in the pump body and a
connecting passage in the idler gear support bracket.
The maintenance procedures are as follows:
Lube Oil Pump Assembly
Lube Oil Pressure Regulator
Lube Oil Distribution System


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