Graco Husky 1590 DB3 Series Installation Manual page 14

PROBLEM
Fluid in exhaust air.
Pump exhausts excessive air at stall.
Pump leaks air externally.
Pump leaks fluid externally from ball
check valves.
14 308441ZAH
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), damaged
seal between manifold and seat (201),
damaged o-rings (202).
SOLUTION
Replace. See pages 18-20.
Tighten or replace. See pages 18-20.
Replace. See pages 18-20.
Repair or replace. See pages 15-16.
Replace. See pages 18-20.
Tighten screws. See page 16.
Inspect; replace. See pages 15-16,
21-22.
Tighten screws. See pages 21-22.
Tighten manifold bolts (106) or
replace seats (201) or o-rings (202).
See page 17.