Graco Python A25030, Instructions Manual

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