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WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 6.
Problem
Pump fails to operate
Pump operates but output
low on both strokes
Pump operates but output
low on down stroke
Pump operates but output
low on up stroke
Erratic or accelerated
operation
Troubleshooting
Cause
Restricted air line or inadequate air
supply
Insufficient air pressure; closed
or clogged air valves, etc.
Exhausted fluid supply
Damaged air motor
Restricted air line or inadequate air
supply
Insufficient air pressure; closed
or clogged air valves, etc.
Exhausted fluid supply
Obstructed fluid line, valves, dispensing
valve, etc.
Worn throat packing (8)
Damaged cylinder o-rings (13)
Held open or worn fluid intake valve
Damaged cylinder o-rings (13)
Held open or worn fluid piston or
seal (19)
Exhausted fluid supply
Held open or worn fluid intake valve
Held open or worn fluid piston or
seal (19)
1. Relieve the pressure.
2. Check all possible remedies in the Troubleshooting
Chart before disassembling the pump.
Solution
Clear air line or increase air supply.
Open or clean air valves, etc.
Refill fluid supply.
Service, see manual 307–043.
Clear air line or increase air supply.
Open or clean air valves, etc.
Refill fluid supply.
Clear. (Relieve pressures and discon-
nect fluid line. Turn on air; if pump starts,
the line, etc. is clogged.)
Replace throat packing.
Replace o-rings.
Clear or service fluid intake valve.
Replace o-rings.
Clear or service fluid piston or seal.
Refill fluid supply.
Clear or service fluid intake valve.
Clear or service fluid piston or seal.
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