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Troubleshooting
310622L 15
PROBLEM
CAUSE SOLUTION
Leak in inlet or outlet sanitary fit-
ting.
Loose sanitary clamp. Tighten clamp.
Damaged or worn gasket. Replace gasket.
Misalignment of inlet/outlet hose or
pipe.
Use flexible hoses at pump inlet
and outlet.
Gasket does not seal. Use a standard sanitary gasket of
flexible material such as EPDM,
Buna-N, fluoroelastomer, or silicon.
Fluid in exhaust air. Diaphragm ruptured. Replace. See page 21.
Loose diaphragm plate. Tighten or replace. See page 21.
Pump exhausts excessive air at
stall.
Worn air valve block, plate, pilot
block, u-cups, or pilot pin o-rings.
Repair or replace. See page 16.
Worn shaft seals. Replace. See page 21.
Pump leaks air externally. Air valve cover is loose. Tighten screws. See page 16.
Air valve gasket or air cover gasket
is damaged.
Inspect; replace. See page 16.
Air cover clamps are loose Tighten clamps.
Pump leaks fluid externally from
ball check valves.
Loose manifolds, damaged seal
between manifold and seat, dam-
aged gaskets.
Tighten manifold clamps or replace
seats or clamps (32). See page 19.
Chattering. Check balls not seating prop-
erly/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.