Troubleshooting
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Troubleshooting
1.
Relieve the pressure (page 9) before checking or
servicing the equipment.
2.
Check all possible problems and causes before dis-
assembling the pump.
* To determine if the fluid hose or gun is obstructed, relieve the pressure. Disconnect the fluid hose and place a con-
tainer at the pump fluid outlet to catch any fluid. Turn on the air just enough to start the pump. If the pump starts when
the air is turned on, the obstruction is in the hose or gun.
Problem
Cause
Solution
Pump operates erratically.
Clogged suction tube or filter.
Clear part(s).
Exhausted fluid supply or damaged
suction section causing air to be
entrained into the fluid section.
Refill fluid supply or repair suction
device.
Pump fails to operate or operates
erratically or with low output.
Restricted line or inadequate air sup-
ply; closed or clogged valves.
Clear line or increase air supply.
Check that valves are open.
Obstructed fluid hose or gun; fluid
hose ID is too small.
Open, clear*; use hose with larger ID.
Output fluid pressure fluctuations.
Damaged or worn piston.
Replace damaged part(s)
Damaged or worn U-cup seals.
Air in fluid section.
Eliminate air
Pump freezes up.
Compressed air too damp.
Change operating conditions.
Stroke frequency too high.
Ambient temperature too low.
Pump stalls, fails to operate properly
(e.g., no resistance), or provides low
output in the downward stroke.
Pressure valve not shutting off prop-
erly, due either to an obstruction or to
wear of the ball and/or seat.
Clear valve.
Replace damaged part(s).
Pump stalls, fails to operate properly
(e.g., no resistance), or provides low
output in the upward stroke.
Suction valve not shutting off prop-
erly, due either to an obstruction or to
wear of the ball and/or seat.
Clear valve.
Replace damaged part(s).
Material visible in weep hole at back
of air motor.
Ruptured bellows
Replace damaged part(s).
Damaged o-rings.
Air continuously escapes from the
exhaust.
Damaged air valve seat or air valve
cup.
Replace damaged part(s).
Filter compressed air supply.
