Troubleshooting - Graco Husky 3300 Repair Parts

Troubleshooting

Troubleshooting
Problem
Pump cycles but will not prime.
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.
8
Cause
Pump is running too fast, causing
cavitation before prime.
Check valve ball severely worn or
wedged in seat or manifold.
Seat severely worn.
Outlet or inlet clogged.
Inlet or outlet valve closed.
Inlet fittings or manifolds loose.
Manifold o-rings damaged.
Worn check valve balls, seats, or
o-rings.
Air valve is stuck or dirty.
Check valve ball severely worn and
wedged in seat or manifold.
Pilot valve worn, damaged, or
plugged.
Air valve gasket damaged.
Dispensing valve clogged.
Clogged suction line.
Sticky or leaking check valve balls.
Diaphragm (or backup) ruptured.
Restricted exhaust.
Pilot valves damaged or worn.
Air valve damaged.
Air valve gasket damaged.
Air supply erratic.
Exhaust muffler icing.
Suction line is loose.
Diaphragm (or backup) ruptured.
Loose manifolds, damaged seats or
o-rings.
Diaphragm shaft bolt o-ring dam-
aged.
Pump cavitation.
Loose diaphragm shaft bolt.
Solution
Reduce air inlet pressure.
Replace ball and seat. See page 12.
Replace ball and seat. See page 12.
Unclog.
Open.
Tighten.
Replace o-rings. See page 12.
Replace. See page 12.
Disassemble and clean air valve.
See page 10. Use filtered air.
Replace ball and seat. See page 12.
Replace pilot valve. See page 14.
Replace gasket. See page 10.
Relieve pressure and clear valve.
Inspect; clear.
Clean or replace. See page 12.
Replace. See page 14.
Remove restriction.
Replace pilot valves. See page 14.
Replace air valve. See page 10.
Replace air valve gasket. See
page 10.
Repair air supply.
Use drier air supply..
Tighten.
Replace. See page 14.
Tighten manifold bolts or replace
seats or o-rings. See page 12.
Replace o-ring.
Reduce pump speed or suction lift.
Tighten.
3A0411A