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Troubleshooting
Problem
Problem
Problem
Fluid in exhaust air.
Pump exhausts excessive
air at stall.
Pump leaks air externally.
Pump leaks fluid externally
from ball check valves.
Chattering.
8
Cause
Cause
Cause
Diaphragm ruptured.
Loose diaphragm plate.
Worn air valve block, plate, pilot block,
u-cups, or pilot pin o-rings.
Worn shaft seals.
Air valve cover is loose.
Air valve gasket or air cover gasket is
damaged.
Air cover clamps are loose
Loose manifolds, damaged seal
between manifold and fluid cover, or
damaged gaskets.
Check valve balls not seating
properly/cleanly due to imbalance
between fluid inlet and outlet line sizing.
Noise is accentuated with light viscosity
fluids.
Solution
Solution
Solution
Replace. See standard or overmolded
diaphragm repair procedure.
Tighten or replace. See standard
or overmolded diaphragm repair
procedure.
Repair or replace.
Replace. See standard or overmolded
diaphragm repair procedure.
Tighten screws.
Inspect; replace.
Tighten clamps.
Tighten manifold clamps or replace
seats or clamps.
Reduce size/diameter of inlet line
relative to outlet line. Outlet line size
should not exceed pump size.
812.0065
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