Graco 234124 - Page 15

308479 15
Troubleshooting
PROBLEM CAUSE SOLUTION
Fluid in exhaust air. Diaphragm ruptured. Replace. See pages 19–21.
Loose diaphragm shaft bolt (107). Tighten or replace (pages 19–21).
Damaged o-ring (108). Replace. See pages 19–21.
Pump exhausts excessive air at
stall.
Worn air valve block (7), o-ring (6),
plate (8), pilot block (18), u-cups
(10), or pilot pin o-rings (17).
Repair or replace. See page 16.
Worn shaft seals (402). Replace. See pages 19–21.
Pump leaks air externally. Air valve cover (2) or air valve cover
screws (3) are loose.
Tighten screws. See page 16.
Air valve gasket (4) or air cover
gasket (22) is damaged.
Inspect; replace. See pages 16,
22–23.
Air cover screws (25) are loose. Tighten screws. See pages 22–23.
Pump leaks fluid externally from ball
check valves.
Loose manifolds (102, 103), dam-
aged seal between manifold and
seat (201), damaged o-rings (202).
Tighten manifold bolts (106) or re-
place seats (201) or o-rings (202).
See page 18.