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308443 15
Troubleshooting
PROBLEM CAUSE SOLUTION
Fluid in exhaust air. Diaphragm ruptured. Replace. See pages 19 to 21.
Loose fluid side plate (105). Tighten or replace (pages 19 to 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 pages
16 to 17.
Worn shaft seals (402). Replace. See pages 19 to 21.
Pump leaks air externally. Air valve cover (2) or air valve cover
screws (3) are loose.
Tighten screws. See page 17.
Air valve gasket (4) or air cover
gasket (22) is damaged.
Inspect; replace. See pages
16 to 17 and 22 to 23.
Air cover screws (25) are loose. Tighten screws. See pages
22 to 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 112)
or replace seats (201) or o-rings
(202). See page 18.