Graco SaniForce 1590 3A, Instructions-Parts List Manual

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Troubleshooting
310622ZAL 17
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 23 (standard)
or page 26 (3A/Overmolded).
Loose diaphragm plate. Tighten or replace. See page 23
(standard) or page 26 (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 18.
Worn shaft seals. Replace. See page 23 (standard)
or page 26 (3A/Overmolded).
Pump leaks air externally. Air valve cover is loose. Tighten screws. See page 18.
Air valve gasket or air cover gasket
is damaged. Inspect; replace. See page 18.
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
21.
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.