Haier 3150 SB User Manual

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.