Graco Husky 1040 Instructions-Parts List Manual page 15

PROBLEM
Fluid in exhaust air.
Pump exhausts excessive
air at stall.
Pump leaks air externally. Air valve cover (2) or air valve cover
Pump leaks fluid
externally from ball check
valves.
Troubleshooting
CAUSE
Diaphragm ruptured.
Loose fluid side plate (105).
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).
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), damaged
seal between manifold and seat (201),
damaged o-rings (202).
SOLUTION
Replace. See pages 19 to 21.
Tighten or replace (pages 19 to 21).
Repair or replace. See pages 16 to 17.
Replace. See pages 19 to 21.
Tighten screws. See page 17.
Inspect; replace. See pages 16 to 17 and 23
to 24.
Tighten screws. See pages 23 to 24.
Tighten manifold bolts (106 or 112) or replace
seats (201) or o-rings (202). See page 18.
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