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Troubleshooting
Problem Cause Solution
Pump is running too fast, causing
cavitation before prime.
Reduce air inlet pressure.
Check valve ball severely worn or
wedged in seat or manifold.
Replace bal
landseat.
Seat sever
ely worn.
Replace ball and seat.
Outlet or inlet clogged.
Unclog.
Inlet or o
utlet valve closed.
Open.
Inlet fit
tings or manifolds loose.
Tighten.
Pump cycles but will not prime.
Manifold o-rings damaged.
Replace o-rings.
Pump cycles at stall or fails to hold
pressure at stall.
Worn ch
eck valve balls, seats, or
o-ring
s.
Replac
e.
Air valve is stuck or dirty. Disassemble and clean air valve.
Use filtered air.
Check valve ball severely worn and
wedged in seat or manifold.
Repl
ace ball and seat.
Pilot valve worn, damaged, or
plugged.
Replace pilot valve.
Air
valve gasket damaged.
Rep
lace gasket.
Pump will not cycle, or cycles once
and stops.
Dispensing valve clogged. Relieve pressure and clear valve.
Cl
ogged suction line.
Inspect; clear.
Sticky or leaking check valve balls. Clean or replace..
Diaphragm (or backup) ruptured.
R
eplace.
Restricted exhaust. Remove restriction.
Pilot valves damaged or worn. Replace pilot valves.
Air valve damaged. Replace air valve.
Air valve gasket damaged. Replace air valve gasket.
Air supply erratic. Repair air supply.
Pump operates erratically.
Exhaust muffler icing.
Use drier air supply.
8 3A2889A