8
859.0089
Air bubbles in fluid.
Suction line is loose.
Tighten.
Diaphragm (and backup) ruptured.
Loose manifolds, damaged seats or
manifold o-rings.
Tighten manifold bolts or replace
seats or o-rings. See page 12.
Diaphragm shaft bolt o-ring dam-
aged.
Replace o-ring.
Pump cavitation.
Reduce pump speed or suction lift.
Loose diaphragm shaft bolt.
Tighten.
Exhaust air contains fluid being
pumped.
Diaphragm (and backup) ruptured.
Loose diaphragm shaft bolt.
Tighten or replace. See page 13.
Diaphragm shaft bolt o-ring dam-
aged.
Moisture in exhaust air.
High inlet air humidity.
Use drier air supply.
Pump exhausts excessive air at stall. Worn air valve cup or plate.
Replace cup and plate. See page 10.
Damaged air valve gasket.
Damaged pilot valve.
Replace pilot valves. See page 13.
Worn shaft seals or bearings.
Replace shaft seals or bearings. See
page 13.
Air tubing is damaged or loose
(remote air control models).
Replace tubing or secure connection.
Remote air pressure is higher than
pump air pressure (remote air control
models).
Regulate remote pilot air pressure to
be equal to or less than main air.
Pump leaks air externally.
Air valve or fluid cover screws loose. Tighten.
Diaphragm damaged.
Replace diaphragm. See page 13.
Air valve gasket damaged.
Remote air pressure is higher than
pump air pressure (remote air control
models).
Regulate remote pilot air pressure to
be equal to or less than main air.
Pump leaks fluid externally from
joints.
Loose manifold screws or fluid cover
screws.
Tighten manifold screws or fluid
cover screws. See page 16.
Manifold o-rings worn out.
Pump leaks fluid externally through
manifold or fluid cover.
Excessive pump speed or inlet
starvation.
Replace manifold and reduce pump
speed or improve pump feed.
Problem
Cause
Solution
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