Troubleshooting
14 312794E
Troubleshooting
NOTE: Check all possible problems and causes before
disassembling the pump.
Relieve the pressure before checking or servicing
the equipment.
Problem Cause Solution
Pump output low on both strokes. Restricted air supply lines. Clear any obstructions; be sure all shutoff
valves are open; increase pressure, but do
not exceed maximum working pressure.
Exhausted fluid supply. Refill and reprime pump.
Clogged fluid outlet line, valves, etc. Clear.
Worn piston packing. Replace. See displacement pump manual
312792.
Pump output low on only one stroke. Held open or worn ball check valves. Check and repair.
Worn piston packings. Replace.
No output. Improperly installed ball check valves. Check and repair.
Pump operates erratically. Exhausted fluid supply. Refill and reprime pump.
Held open or worn ball check valves. Check and repair.
Worn piston packing. Replace.
Pump will not operate. Restricted air supply lines. Clear any obstructions; be sure all shut off
valves are open; increase pressure, but do
not exceed maximum working pressure.
Exhausted fluid supply. Refill and reprime pump.
Clogged fluid outlet line, valves, etc. Clear.
Damaged air motor. See air motor manual 312796.
Fluid dried on piston rod. Disassemble and clean pump. See page 15
and manual 312792. In future, stop pump at
bottom of stroke.
Runaway solenoid has tripped. Retract solenoid. See air motor manual
312796.
