Graco 308652Y important safety instructions Replacing Check Valves, Service, ti10665a

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).

52

21

20

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.

58

1

51

58

Fig. 7 ti10665a

14 308652