Troubleshooting - Graco Python A25030 Instructions Manual

Troubleshooting

Problem
Air bubbles in fluid
Timing valve not cycling
Timing valve cycling, but pump not
stroking
Fluid leaking
Pump stroking, but no fluid moving
3A3101F
1. Follow Pressure Relief Procedure, page 17,
2. Check all possible problems and causes before dis-
Cause
Suction line is loose
Debris in timing valve
Worn timing valve seals
Fluid back pressure too high
Packings too tight
Loose fittings
Worn seals
Air in pump
Worn or damaged check valve seals Rebuild inlet and outlet check valves
before checking or repairing pump.
assembling pump.
Tighten
Clean or rebuild timing valve
Rebuild timing valve
Verify pump is sized to back pres-
sure. Check inlet gas pressure.
Loosen or replace packing
Tighten fittings
Adjust packing (if leak persists,
replace packing)
Prime pump
Troubleshooting
Solution
23