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Troubleshooting
312766N 21
Troubleshooting
Problem Cause Solution
The pump fails to operate. Dirty or worn air motor. Clean, service.
Inadequate air supply or
restricted lines.
Clean lines or increase the air
supply (see Technical Data).
Closed or clogged air valves. Open or clear the valves.
Clogged fluid hose or valve. Clear the hose or valves.
Worn or damaged valves or
seals.
Service the valves or seals.
The pump operates, but the
output is low on both strokes.
Clogged fluid hose or valve. Clear the hose or valves.
Low or empty fluid supply. Refill the fluid supply and rep-
rime the pump.
Worn or damaged valves or
seals.
Service the valves or seals.
The pump operates, but the
output is low on the down-
stroke.
Held open or worn intake
valve.
Clear or service the valve.
Worn or damaged valves or
seals.
Service the valves or seals.
The pump operates, but the
output is low on the upstroke.
Held open or worn piston
valve.
Clear or service the valve.
Worn or damaged valves or
seals.
Service the valves or seals.
Erratic or accelerated opera-
tion.
Low or empty fluid supply. Refill the fluid supply and rep-
rime the pump.
Broken air motor compression
spring.
Replace the spring.
Pump slowly moves after fluid
shutoff in downstroke.
Clogged or dirty intake valve
check ball.
Clean ball and seat.
Worn or damaged valves or
seats.
Install repair kit.
Pump slowly moves after fluid
shutoff in upstroke.
Clogged or dirty lower piston
ball or seat.
Clean ball and seat.
Worn or damaged valves or
seats.
Install repair kit.