Troubleshooting - Graco Husky Sanitary Series Instructions-Parts List Manual

Troubleshooting

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 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.
14
• Relieve the pressure before checking or servicing
the equipment.
• Check all possible problems and causes before dis-
assembling the pump.
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).
SOLUTION
Replace. See page 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 bolts (106) or
replace seats (201) or o-rings
(202). See page 18.
Tighten or replace (pages 19-21).
Replace. See pages 19-21.
309528L