Graco Husky 3300 Repair Parts page 9

Problem
Exhaust air contains fluid being
pumped.
Moisture in exhaust air.
Pump exhausts excessive air at stall. Worn air valve cup or plate.
Pump leaks air externally.
Pump leaks fluid externally from
joints.
3A0411A
Cause
Diaphragm (or backup) ruptured.
Loose diaphragm shaft bolt.
Diaphragm shaft bolt o-ring dam-
aged.
High inlet air humidity.
Damaged air valve gasket.
Damaged pilot valve.
Worn shaft seals or bearings.
Air valve or fluid cover screws loose. Tighten.
Diaphragm damaged.
Air valve gasket damaged.
Air cover gasket damaged.
Loose manifold screws or fluid cover
screws.
Manifold o-rings worn out.
Troubleshooting
Solution
Replace. See page 14.
Tighten or replace. See page 14.
Replace o-ring. See page 14.
Use drier air supply.
Replace cup and plate. See page 10.
Replace gasket. See page 10.
Replace pilot valves. See page 14.
Replace shaft seals or bearings. See
page 14.
Replace diaphragm. See page 14.
Replace gasket. See page 10.
Replace gasket. See page 14.
Tighten manifold screws or fluid
cover screws. See page 20.
Replace o-rings. See page 12.
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