TM 5-3810-300-24&P-3
12.4 Air Compressor
Service Note
When installing a pulley or a drive hub on a flange
mounted air compressor (Fig. 2), it is important the 3/4
"-10 drive shaft slotted nut be tightened to 100 lb-ft
torque minimum before installing the 3/32 " x 1-1/4 "
cotter pin.
The air compressor drive shaft will turn during the
torquing operation unless some provision is made to hold
it. One way this can be done is to weld a modified drive
coupling to a support or base which in turn can be
anchored to the mounting flange of the compressor. An
old flywheel housing cover that matches the flange of the
compressor makes an ideal base for the modified
coupling. With the exterior splines of the coupling in
mesh with the internal splines of the drive hub and the
entire assembly secured to the compressor housing, the
hub and shaft are kept from rotating when the torque is
Fig. 3 - Fixture For Holding Drive While Installing or
applied. That part of the base within the inner diameter
Removing Slotted Nut
of the coupling must be removed to permit placement of
the wrench socket on the nut. Two bolts will secure the
base to the compressor during the torquing operation
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