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14 308652
Service
Replacing Check Valves
Replace each pair of check valves as follows. See
Fig. 7.
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 8.
2. Remove the eight screws (58) that hold the fluid
cover/center housing assembly on the man-
ifold (52), and lift the manifold covers/center hous-
ing 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. Reinstall the fluid covers/center housing assembly
on the manifold (52), install the screws (58) that
fasten the fluid covers/center housing assembly to
the manifold, and torque to 42–47 in-lb (4.5–5.0
NSm). See Torque Sequence on page 18.
6. Reconnect the pump.
Fig. 7
ti10665a
1
52
21
20
51
58
58