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Troubleshooting
PROBLEM
Pump will not cycle, or cycles once
and stops.
Pump cycles at stall or fails to hold
pressure at stall.
Pump operates erratically.
Air bubbles in fluid.
Fluid in exhaust air.
Pump exhausts air from clamps.
Pump leaks fluid from check valves.
No fluid output, and pump cycles
rapidly.
Pump leaks air through the exhaust
port.
819.0416
1. Follow the Pressure Relief Procedure, page 11.
2. Check all possible problems and causes before dis-
CAUSE
Air valve is stuck or dirty.
Check valve ball is severely worn and
wedged in seat or manifold.
Worn check valve balls, seats, or
o-rings.
Check valve ball wedged in seat.
Worn diaphragm shaft seals.
Clogged suction line.
Sticky or leaking check valve balls.
Diaphragm ruptured.
Restricted exhaust.
Suction line is loose.
Diaphragm ruptured.
Loose inlet manifold, damaged seal
between manifold and seat, or dam-
aged manifold o-rings.
Loose diaphragm shaft bolt or fluid
side diaphragm plates.
Diaphragm ruptured.
Loose diaphragm shaft bolt or fluid
side diaphragm plates.
Worn diaphragm shaft seals.
Loose manifolds, damaged seal
between manifold and seat, or dam-
aged manifold o-rings.
Air valve o-ring is damaged.
Worn or damaged check valve o-ring. Inspect; replace. See page 16.
Pump mounted incorrectly.
Worn air valve u-cups.
assembling the pump.
Disassemble and clean air valve.
See page 14. Use filtered air.
Replace ball and seat. See page 16.
Replace. See page 16.
Repair or replace. See page 16.
Replace. See page 16 (standard dia-
phragms).
Inspect; clear.
Clean or replace. See page 16.
Replace. See page 16 (standard dia-
phragms) or page 18 (overmolded
diaphragms).
Remove restriction.
Tighten.
Replace. See page 16 (standard dia-
phragms) or page 18 (overmolded
diaphragms).
Tighten manifold clamps, or replace
seats or o-rings. See page 16.
Tighten or replace. See page 16
(standard diaphragms).
Replace. See page 16 (standard dia-
phragms) or page 18 (overmolded
diaphragms).
Tighten. See page 16 (standard dia-
phragms).
Replace. See page 16 (standard dia-
phragms).
Tighten manifold clamps, or replace
seats or o-rings. See page 16.
Inspect; replace. See page 14.
Mount the pump in the upright posi-
tion.
Inspect; replace. See page 14.
Troubleshooting
SOLUTION
13
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