Troubleshooting
14
309528L
Troubleshooting
•
Relieve the pressure before checking or servicing
the equipment.
•
Check all possible problems and causes before dis-
assembling the pump.
WARNING
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
CAUSE
SOLUTION
Pump cycles at stall or fails to hold
pressure at stall.
Worn check valve balls (301), seats
(201) or o-rings (202).
Replace. See page 18.
Pump will not cycle, or cycles once
and stops.
Air valve is stuck or dirty.
Disassemble and clean air valve.
See page 16. Use filtered air.
Check valve ball (301) severely
worn and wedged in seat (201) or
manifold (102 or 103).
Replace ball and seat. See page
18.
Check valve ball (301) is wedged
into seat (201), due to overpressur-
ization.
Install Pressure Relief Valve
(see page 10).
Dispensing valve clogged.
Relieve pressure and clear valve.
Pump operates erratically.
Clogged suction line.
Inspect; clear.
Sticky or leaking balls (301).
Clean or replace. See page 18.
Diaphragm ruptured.
Replace. See pages 19-21.
Restricted exhaust.
Remove restriction.
Air bubbles in fluid.
Suction line is loose.
Tighten.
Diaphragm ruptured.
Replace. See pages 19-21.
Loose inlet manifold (102), dam-
aged seal between manifold and
seat (201), damaged o-rings (202).
Tighten manifold bolts (106) or
replace seats (201) or o-rings
(202). See page 18.
Loose diaphragm shaft bolt (107).
Tighten or replace (pages 19-21).
Damaged o-ring (108).
Replace. See pages 19-21.
