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Service
Replacing Check Valves
Replace each pair of check valves as follows. See Fig. 6.
1.
Relieve the pressure, and disconnect the air line from
the pump.
Warning
To reduce the risk of serious injury whenever you are
instructed to relieve pressure, always follow the Pressure
Relief Procedure on page 7.
2.
Remove the eight screws (58) that hold the fluid cover/
center housing assembly on the manifold (52), and lift
the manifold covers/center housing assembly off of the
manifold (52).
3.
Remove and replace the check valves (20), being care-
ful to orient each check valve exactly like the one it
is replacing. Make sure the check valve/seat area is
clean.
4.
Remove and replace the sealing o-rings (21). Once com-
pressed, o-rings may not be reused. Make sure the
check valve/seat area is clean.
5.
Replace the manifold covers/center housing assembly
on the manifold (52), replace the screws (58) that fasten
the manifold covers/center housing assembly to the
manifold, and torque the screws to 40 in-lb (4.5 N.m).
See Torque Sequence on page 17.
6.
Reconnect the pump.
20
21
52
Fig. 6
1
51
58
58
20
21
06178A
819.6247
13
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