Graco SaniForce 1590 3A, Instructions-Parts List Manual, Page: 16 / 50

Troubleshooting
16 310622ZAL
Troubleshooting
• Follow the Pressure Relief Procedure, page 13, before checking or servicing the equipment.
• Check all possible problems and causes before disassembling the pump.
PROBLEM
CAUSE SOLUTION
Pump cycles at stall or fails to hold
pressure at stall. Worn check valve balls (541) or
seats (233). Replace. See page 21.
Pump will not cycle, or cycles once
and stops. Air valve is stuck or dirty. Disassemble and clean air valve.
See page 18. Use filtered air.
Check valve ball (541) severely
worn and wedged in seat (233) or
manifold. Replace ball and seat. See page
21.
Check valve ball (541) is wedged
into seat (233), due to overpressur-
ization. Follow Pressure Relief Proce-
dure, page 13. Disassemble ball
check assembly and inspect for
damage, see page 21.
Dispensing valve clogged. Relieve pressure and clear valve.
Leak detector has activated a shut-
down solenoid Investigate failure and reset leak
detector
Pump operates erratically. Clogged suction line. Inspect; clear.
Sticky or leaking balls (541). Clean or replace. See page 21.
Diaphragm ruptured. Replace. See page 23 (standard)
or page 26 (3A/Overmolded).
Restricted exhaust. Remove restriction.
Air bubbles in fluid. Suction line is loose. Tighten.
Diaphragm ruptured. Replace. See page 23 (standard)
or page 26 (3A/Overmolded).
Loose inlet manifold, damaged seal
between manifold and seat, dam-
aged gaskets. Tighten manifold clamps or replace
seats or gaskets. See page 21.