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Troubleshooting
WARNING
To reduce the risk of serious injury, whenever you are
instructed to relieve pressure, always follow the Pres-
sure Relief Procedure on page 13.
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.
16
•
•
CAUSE
Worn check valve balls (41), seats
(33) or gaskets (40).
Air valve is stuck or dirty.
Check valve ball (41) severely worn
and wedged in seat (33) or mani-
fold.
Check valve ball (41) is wedged
into seat (33), due to overpressur-
ization.
Dispensing valve clogged.
Leak detector has activated a shut
down solenoid
Clogged suction line.
Sticky or leaking balls (41).
Diaphragm ruptured.
Restricted exhaust.
Suction line is loose.
Diaphragm ruptured.
Loose inlet manifold, damaged seal
between manifold and seat, dam-
aged gaskets.
Relieve the pressure before checking or servicing
the equipment.
Check all possible problems and causes before dis-
assembling the pump.
SOLUTION
Replace. See page 22.
Disassemble and clean air valve.
See page 18. Use filtered air.
Replace ball and seat. See page
22.
Follow Pressure Relief Proce-
dure, page 13. Disassemble ball
check assembly and inspect for
damage, see page 22.
Relieve pressure and clear valve.
Investigate failure and rest leak
detector
Inspect; clear.
Clean or replace. See page 22.
Replace. See page 23.
Remove restriction.
Tighten.
Replace. See pages 23.
Tighten manifold clamps or replace
seats or gaskets. See page 22.
Troubleshooting
310622C
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