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WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 12.
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.
14
308550
Troubleshooting
1. Relieve the pressure before checking or servicing
2. Check all possible problems and causes before
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 fluid side diaphragm plate
(105).
the equipment.
disassembling the pump.
SOLUTION
Replace. See page 18.
Disassemble and clean air valve.
See pages 16–17. 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 19–22.
Remove restriction.
Tighten.
Replace. See pages 19–22.
Tighten manifold bolts (112) or re-
place seats (201) or o-rings (202).
See page 18.
Tighten or replace. See pages
19–22.
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