Troubleshooting
3A4552A
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 (standard)
or page 24 (3A/Overmolded).
Loose diaphragm plate.
Tighten or replace. See page 21
(standard) or page 24 (3A/Over-
molded).
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 (standard)
or page 24 (3A/Overmolded).
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 (132). 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.