Problem
Problem
Problem
Cause
Cause
Cause
Solution
Solution
Solution
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.
Air valve cover is loose.
Tighten screws.
Air valve gasket or air cover gasket is
damaged.
Inspect; replace.
Pump leaks air externally.
Air cover clamps are loose
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.
8
812.0065
