819.4470
12
Troubleshooting
Warning
To reduce the risk of serious injury whenever you are
instructed to relieve pressure, always follow the
Pressure
Relief Procedure
on page 10.
1.
Relieve the pressure before checking or servicing the
equipment.
2.
Check all possible problems and causes before disas-
sembling the pump.
PROBLEM
CAUSE
SOLUTION
Pump cycles at stall or fails to hold pres-
sure at stall.
Worn check valve balls (301),
seats (201) or o-rings (202).
Replace. See page 16.
Pump will not cycle, or cycles once and
stops.
Air valve is stuck or dirty.
Disassemble and clean air valve. See
pages 14–15. Use filtered air.
Check valve ball (301) severely worn
and wedged in seat (201) or man-
ifold (102 or 103).
Replace ball and seat. See page 16.
Check valve ball (301) is wedged into
seat (201), due to overpressurization.
Install Pressure Relief Valve
(see page 9).
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 16.
Diaphragm ruptured.
Replace. See pages 17–19.
Restricted exhaust.
Remove restriction.
Air bubbles in fluid.
Suction line is loose.
Tighten.
Diaphragm ruptured.
Replace. See pages 17–19.
Loose inlet manifold (102), damaged
seal between manifold and seat (201),
damaged o-rings (202).
Tighten manifold bolts (106) or replace
seats (201) or o-rings (202). See
page 16.
Loose diaphragm shaft bolt (107).
Tighten or replace (pages 17–19).
Damaged o-ring (108).
Replace. See pages 17–19.
