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Troubleshooting
309868D 7
Troubleshooting
Check all other possible problems and solutions
before disassembling the pump. Before you trouble-
shoot problems using the table below, relieve the
pressure and disconnect the pump fluid line. If the
pump starts when the air is turned on again, the
fluid line, dispensing valve, etc., is clogged.
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, valve, etc. Clear
Damaged air motor Service air motor
Exhausted fluid supply Refill and reprime 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 reprime or flush
Pump operates, but output low
on down stroke
Held open or worn intake valve or pis-
ton packings
Clear; service
Pump operates, but output low
on up stroke
Held open or worn piston ball or piston
packings
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; clean
Exhausted fluid supply Refill and reprime or flush
Clogged fluid lines, hoses, valves, etc. Clear