308-550 15
Troubleshooting
PROBLEM CAUSE SOLUTION
Fluid in exhaust air
.
Diaphragm ruptured.
Replace. See pages 19–21.
Loose fluid side diaphragm plate
(105).
T
ighten or replace. See pages
19–21.
Pump exhausts excessive air at
stall.
W
orn air valve block (7), o-ring (6),
plate (8), pilot block (18), u-cups
(10), or pilot pin o-rings (17).
Inspect; replace. See pages 16–17.
W
orn shaft seals (402).
Replace. See pages 19–21.
Pump leaks air externally
.
Air valve cover (2) or air valve cover
screws (3) are loose.
T
ighten screws. See page 17.
Air valve gasket (4) or air cover
gasket (22) is damaged.
Inspect; replace. See pages 16–17,
22–23.
Air cover screws (25) are loose.
T
ighten 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).
T
ighten manifold bolts (106 and
1
12) or replace seats (201) or
o-rings (202). See page 18.
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