VERDER VERDERAIR VA25 Manual page 8

Problem
Air bubbles in fluid.
Exhaust air contains fluid being
pumped.
Moisture in exhaust air.
Pump exhausts excessive air at stall. Worn air valve cup or plate.
Pump leaks air externally.
Pump leaks fluid externally from
joints.
Pump leaks fluid externally through
manifold or fluid cover.
8 859.0089
Cause
Suction line is loose.
Diaphragm (and backup) ruptured.
Loose manifolds, damaged seats or
manifold o-rings.
Diaphragm shaft bolt o-ring dam-
aged.
Pump cavitation.
Loose diaphragm shaft bolt.
Diaphragm (and backup) ruptured.
Loose diaphragm shaft bolt.
Diaphragm shaft bolt o-ring dam-
aged.
High inlet air humidity.
Damaged air valve gasket.
Damaged pilot valve.
Worn shaft seals or bearings.
Air tubing is damaged or loose
(remote air control models).
Remote air pressure is higher than
pump air pressure (remote air control
models).
Air valve or fluid cover screws loose. Tighten.
Diaphragm damaged.
Air valve gasket damaged.
Remote air pressure is higher than
pump air pressure (remote air control
models).
Loose manifold screws or fluid cover
screws.
Manifold o-rings worn out.
Excessive pump speed or inlet
starvation.
Solution
Tighten.
Replace. See page 13.
Tighten manifold bolts or replace
seats or o-rings. See page 12.
Replace o-ring.
Reduce pump speed or suction lift.
Tighten.
Replace. See page 13.
Tighten or replace. See page 13.
Replace o-ring. See page 13.
Use drier air supply.
Replace cup and plate. See page 10.
Replace gasket. See page 9.
Replace pilot valves. See page 13.
Replace shaft seals or bearings. See
page 13.
Replace tubing or secure connection.
Regulate remote pilot air pressure to
be equal to or less than main air.
Replace diaphragm. See page 13.
Replace gasket. See page 9.
Regulate remote pilot air pressure to
be equal to or less than main air.
Tighten manifold screws or fluid
cover screws. See page 16.
Replace o-rings. See page 12.
Replace manifold and reduce pump
speed or improve pump feed.