Problem
Problem
Problem
Cause
Cause
Cause
Solution
Solution
Solution
Manifolds do not fit for
installation onto fluid
covers.
Use of incorrect air cover gaskets
results in misalignment.
Install correct air cover gaskets for
the type of diaphragms in use. See
Parts list for correct gasket.
Diaphragm ruptured.
Replace. See standard or
overmolded diaphragm repair
procedure.
Fluid in exhaust air.
Loose diaphragm plate.
Tighten or replace. See standard
or overmolded diaphragm repair
procedure.
Worn air valve block, plate, pilot
block, u-cups, or pilot pin o-rings.
Repair or replace.
Pump exhausts excessive
air at stall.
Worn shaft seals.
Replace. See standard or
overmolded diaphragm repair
procedure.
Loose air valve cover.
Tighten screws.
Air valve gasket or air cover gasket
is damaged.
Inspect; replace.
Pump leaks air externally.
Loose air cover clamps
Tighten clamps.
Pump leaks fluid
externally from ball check
valves.
Loose manifolds, damaged seal
between manifold and fluid cover, or
damaged gaskets.
Tighten manifold clamps or replace
seats or clamps.
Chattering.
Check valve balls not seating
properly/cleanly due to imbalance
between fluid inlet and outlet line
sizing. Noise is accentuated with
light viscosity fluids.
Reduce size/diameter of inlet line
relative to outlet line. Outlet line size
should not exceed pump size.
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3A6781D
