User's Manual

Troubleshootin
g
Problem Cause Solution
Suction line i
s loose.
Tighten.
Diaphragm (or backup) ruptured.
Replace.
Loose manifolds, damaged seats or
o-rings.
Tighten manifold bolts or replace
seats or o-rings.
Pump cavitation.
Reduce pump
speed or suction lift.
Air bubbles in
fluid.
Loose diaphragm shaft bolt.
Tighten.
Diaphragm (or backup) ruptured.
Replace.
Exhaust air contains fluid being
pumped.
Loose dia
phragm shaft bolt.
Tighten or replace.
Moisture in exhaust air. High inlet air humidity. Use drier air supply.
Worn air valve cup or plate. Replace cup and plate.
Damaged
air valve gasket.
Replace
gasket.
Damaged pilot valve. Replace pilot valves.
Pump exhausts excessive air at
stall.
Worn sh
aft seals or bearings.
Replac
e shaft seals or bearings.
Air valve or fluid cover screws loose.
Tighten.
Diaph
ragm damaged.
Repla
ce diaphragm.
Pump leaks air externally.
Air valve gasket damaged. Replace gasket.
Loos
e manifold screws or fluid cover
scre
ws.
Tigh
ten manifold screws or fluid
cove
rscrews.
Pump
leaks fluid externally from
join
ts.
Manifold o-rings worn out.
Replace o-rings. Alternate
materials are available. See
Manifold Seals, page 30.
3A2714B 9