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Troubleshooting
Troubleshooting
To reduce the risk of serious injury, whenever you are
instructed to relieve pressure, always follow the Pres-
sure Relief Procedure on page 11.
PROBLEM
Pump cycles at stall or fails to hold
pressure at stall.
Pump will not cycle, or cycles once
and stops.
Pump operates erratically.
Air bubbles in fluid.
Chattering - noisy operation.
14
•
•
CAUSE
Worn check valve balls (301), seats
(201) or o-rings (202).
Air valve is stuck or dirty.
Check valve ball (301) severely
worn and wedged in seat (201) or
manifold (102 or 103).
Check valve ball (301) is wedged
into seat (201), due to overpressur-
ization.
Dispensing valve clogged.
Clogged suction line.
Sticky or leaking balls (301).
Diaphragm ruptured.
Restricted exhaust.
Suction line is loose.
Diaphragm ruptured.
Loose inlet manifold (102), dam-
aged seal between manifold and
seat (201), damaged o-rings (202).
Loose diaphragm shaft bolt (107).
Damaged o-ring (108).
Check valve balls do not seat prop-
erly/cleanly due to imbalance
between fluid inlet and outlet line
sizing. Noise is accentuated with
light viscosity fluids.
Relieve the pressure before checking or servicing
the equipment.
Check all possible problems and causes before dis-
assembling the pump.
SOLUTION
Replace. See 18.
Disassemble and clean air valve. See
page 16. Use filtered air.
Replace ball and seat. See page 18.
Install Pressure Relief Valve
(see page 10).
Relieve pressure and clear valve.
Inspect; clear.
Clean or replace. See page 18.
Replace. See pages 19-21.
Remove restriction.
Tighten.
Replace. See pages 19-21.
Tighten manifold clamps (113), or
replace seats (201) or o-rings (202).
See page 18.
Tighten or replace (pages 19-21).
Replace. See pages 19-21.
Reduce size/diameter of inlet line rela-
tive to outline line. Outlet line size
should not exceed pump size.
311879F
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