Graco Husky 1040 Instructions-Parts List Manual page 15

PROBLEM
Fluid in exhaust air.
Pump exhausts excessive air at
stall.
Pump leaks air externally.
Pump leaks fluid externally from ball
check valves.
Troubleshooting
CAUSE
Diaphragm ruptured.
Loose diaphragm shaft bolt (107).
Damaged o-ring (108).
Worn air valve block (7), o-ring (6),
plate (8), pilot block (18), u-cups
(10), or pilot pin o-rings (17).
Worn shaft seals (402).
Air valve cover (2) or air valve cover
screws (3) are loose.
Air valve gasket (4) or air cover
gasket (22) is damaged.
Air cover screws (25) are loose.
Loose manifolds (102, 103), dam-
aged seal between manifold and
seat (201), damaged o-rings (202).
SOLUTION
Replace. See pages 19–21.
Tighten or replace (pages 19–21).
Replace. See pages 19–21.
Repair or replace. See page 16.
Replace. See pages 19–21.
Tighten screws. See page 16.
Inspect; replace. See pages 16,
22–23.
Tighten screws. See pages 22–23.
Tighten manifold bolts (106) or re-
place seats (201) or o-rings (202).
See page 18.
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