11
Service
Replacing Check Valves
Use Service Kit Part No. 784–90610. Replace each pair of
check valves as follows. See Fig. 5.
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
Pres-
sure 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
careful 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
compressed, 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).
6.
Reconnect the pump.
Figure 5
06178A
52
51
1
58
58
21
20
21
20
