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TM 10-4320-351-14
(14)
Remove and discard the shaft seal housing O-ring (18).
(15)
Inspect and clean O-ring grooves as required. Any debris or foreign material may prevent the O-rings from
seating properly.
b.
Installation.
(1)
Lubricate lightly and install O-ring (18) in vane pump housing (19).
(2)
Lubricate lightly and install O-ring (14) on shaft.
(3)
Lubricate stationary seal (10) and push into shaft seal housing (4) so that elastomer portion seats against
housing.
(4)
Install rotating spring (12) on spacer (13), and install on shaft so that lipped portion of seal faces out (to
interface with stationary seal installed in previous step).
(5)
Apply anti-seize compound to the five shaft seal housing screws (8). Place shaft seal housing (4) over
shaft with weep hole facing down and mounting holes aligned, hold housing down against spring pressure,
and install the five screws (8) and flat washers (9) that secure shaft seal housing (4) to vane pump housing
(19).
(6)
Rotate shaft by hand to check freedom of rotation. Some rubbing at the inlet is normal but if the shaft binds
or will not turn, remove shaft seal housing (4) and check rotating shaft seal (11) for proper assembly.
(7)
Install washer (7) and shaft nut (6) on shaft hand tight.
(8)
Install splined flexible coupling adapter (5) on pump shaft. Tighten set screw against shaft key (20).
NOTE
The shaft nut (4) must be torqued to a specific value to provide the proper tension
on the rotating shaft seal (11). However, a standard socket on a torque wrench
cannot be used. A crow foot adapter, as shown in the illustration below, will allow
access to the nut but adding the adapter will also cause the torque reading on the
wrench to be different from the actual torque applied to the nut. To calculate the
torque value to be indicated when the required torque is known, perform the
following procedure:
1. Measure the distance L1 on the torque wrench to be used.
2. Install the crow foot adapter and measure the distance L2.
3. Divide L2 into L1.
4. Multiply the quotient by the torque specified for the nut. The product is the torque
value that will be indicated on the wrench when the specified torque has been
reached on the nut.
5-11
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