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308441 13
Troubleshooting
PROBLEM CAUSE SOLUTION
Fluid in exhaust air. Diaphragm ruptured. Replace. See pages 17–19.
Loose diaphragm shaft bolt (107). Tighten or replace. See pages
17–19.
Damaged o-ring (108). Replace. See pages 17–19.
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 pages
14–15.
Worn shaft seals (402). Replace. See pages 17–19.
Pump leaks air externally. Air valve cover (2) or air valve cover
screws (3) are loose.
Tighten screws. See page 15.
Air valve gasket (4) or air cover
gasket (22) is damaged.
Inspect; replace. See pages 14–15,
20–21.
Air cover screws (25) are loose. Tighten screws. See pages 20–21.
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 16.