Troubleshooting
308608L 11
Troubleshooting
1. Follow Pressure Relief Procedure, page 8, before
checking or repairing the pump.
2. 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, etc.
Problem Cause Solution
Pump fails to operate. Inadequate air supply pressure or
restricted air lines
Increase air supply; clear
Closed or clogged dispensing valve Open; clear
Clogged fluid lines, hoses, valves,
etc.
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, etc.
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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