Graco 253485 Instructions-Parts List Manual page 13

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 17–19.
Tighten or replace. See pages
17–19.
Replace. See pages 17–19.
Repair or replace. See pages
14–15.
Replace. See pages 17–19.
Tighten screws. See page 15.
Inspect; replace. See pages 14–15,
20–21.
Tighten screws. See pages 20–21.
Tighten manifold bolts (106) or re-
place seats (201) or o-rings (202).
See page 16.
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