10
307-427
Troubleshooting
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure
on page 8.
1. Relieve the pressure.
2. Check all other possible remedies before disas-
sembling the pump.
PROBLEM
CAUSE
SOLUTION
The pump fails to operate.
Dirty or worn air motor.
Clean, service; see the separate motor
manual 307–456.
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.
Exhausted fluid supply.
Refill the fluid supply and reprime the
pump.
Worn or damaged valves or seals.
Service the valves or seals.
The pump operates, but the output
is low on the downstroke.
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 operation.
Exhausted fluid supply.
Refill the fluid supply and reprime the
pump.
Broken air motor compression spring. Replace the spring.
