Troubleshooting
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Troubleshooting
Follow Pressure Relief Procedure, page 8, before
checking or repairing the pump.
Check all possible problems and causes before
disassembling pump.
*Follow the Pressure Relief Procedure, page 8, then disconnect the fluid line. If the pump starts when the air is
turned on again, there is a clog in the line, hose, valve, or other components.
Problem Cause Solution
Pump fails to operate, or there is no
fluid flow.
Inadequate air supply pressure or
restricted air lines
Increase air supply; clear
Closed or clogged dispensing valve Open; clear
Clogged fluid lines, hoses, valves,
or other components.
Clear*
Damaged air motor Service air motor
Exhausted fluid supply Refill and re-prime or flush
Continuous air exhaust Worn or damaged air motor gasket,
packing, seal, or other components.
Service air motor
Erratic pump operation Exhausted fluid supply Refill and re-prime or flush
Held open or worn intake valve or
piston packings
Clear; service
Pump operates, but output low on
up stroke
Held open or worn piston packings Clear; service
Pump operates, but output low on
down stroke
Held open or worn intake valve Clear; service
Pump operates, but output low on
both strokes
Inadequate air supply pressure or
restricted air lines
Increase air supply; clear
Closed or clogged valves Open; clear
Fluid is coming out of the muffler Worn or damaged throat seal Repair
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