Check Valve Repair - Graco Mark VII Max Repair Manual

Check Valve Repair

Check Valve Repair
1. Flush pump. Turn power OFF. Wait 5 minutes for
power to dissipate. Perform Pressure Relief
Procedure, page 9.
2. Separate drain hose from sprayer.
3. Disconnect paint hose from check valve.
4. Remove check valve assembly from pump.
5. Remove check valve outlet fitting.
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6. Replace o-rings (4), ball housing (2), ceramic ball
(3), and seat (5).
3a
7. Apply pipe sealant to check valve inlet threads.
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8. Use 1.5 in. wrench to securely tighten check valve
to pump.
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9. Connect paint hose and hand tighten to 70 in-lb
(8 N•m).
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3b
3c
3d
3c
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3A2244A
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