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Troubleshooting
3A3101F
23
Troubleshooting
1.
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