Graco Python A25011, Instructions - Parts Manual

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Troubleshooting
3A4386E 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
Pump runs, but chemical
discharges at the incorrect
rate.
Inlet check is
clogged with debris. Remove debris from check valve.
Inlet check o-ring is
damaged.
Evaluate o-ring chemical compatibility and
replace as required.
Ensure suction lines are tight, and then prime
the pump.
Air in pump head. Packing leak.
Inadequate chemical
supply.
Ensure chemical tank is filled.
Inspect and replace chemical filter.
Incorrect calibration.
Ensure the calibration gauge is functioning
properly with good venting.
Problem Cause Solution
Pump does not stroke.
Inadequate pneu-
matic supply.
If the pressure is too low: increase the pneu-
matic supply pressure.
If the volume is too low: ensure the pneumatic
supply volume is adequate to operate the
pump.
Dirty gas supply.
Install a filter.
Replace the filter element.
Inadequate internal
lubrication.
Ensure pneumatic supply gas is clean and dry
with a working filter. Then lubricate the air motor
internals.
Add an oiler if pneumatic supply gas contains
solvents that are washing out the factory
grease. Graco oiler 237212.
Fluid back pressure
is too high. Verify pump is sized to back pressure. Check
inlet gas.
Timing valve is not
cycling.
Clean timing valve.
Rebuild timing valve.
Packings too tight. Loosen or replace packing.