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Troubleshooting
To reduce the risk of serious injury, including splashing fluid in the eyes or on the skin, follow the Pressure
Relief Procedure on page 9. You must do this whenever this manual instructs you to relieve pressure, when
you shut off the pump, and before checking, adjusting, cleaning, moving, or repairing any system equipment.
WARNING
NOTE: Check all possible problems and causes before you disassemble the pump.
PROBLEM CAUSE SOLUTION
Pump cycles at stall or fails to hold pres-
sure at stall.
Worn check valve balls (201), seats
(101) or o-rings (102).
Replace. See page 14.
Pump will not cycle, or cycles once and
stops.
Air valve is stuck or dirty. Disassemble and clean air valve. See
pages 12 to 13. Use filtered air.
Check valve ball (201) severely worn
and wedged in seat (101) or manifold
(50 or 53).
Replace ball and seat. See page 14.
Check valve ball (201) is wedged into
seat (101), due to overpressurization.
Install a pressure relief valve
(see page 7).
Dispensing valve is clogged. Relieve pressure and clear valve.
Pump operates erratically. Suction line is clogged. Inspect; clear.
Sticky or leaking check valve balls
(201).
Clean or replace. See page 14.
Diaphragm (301) is ruptured. Replace. See pages 15 to 17.
Restricted exhaust. Remove restriction.
Air bubbles in fluid. Suction line is loose. Tighten.
Diaphragm (301) is ruptured. Replace. See pages 15 to 17.
Loose inlet manifold (53), damaged seal
between manifold and seat (101), or
damaged o-rings (101).
Tighten manifold bolts (54), or replace
seats (101) or o-rings (102). See
page 14.
Loose diaphragm shaft bolt (14). Tighten or replace. See pages 15 to 17.
Damaged o-ring (102). Replace. See pages 15 to 17.
Fluid in exhaust air. Diaphragm (301) is ruptured. Replace. See pages 15 to 17.
Loose diaphragm shaft bolt (14). Tighten or replace. See pages 15 to 17.
Damaged o-ring (102). Replace. See pages 15 to 17.
Pump leaks air externally. Air valve cover screws (3) are loose. Tighten screws. See page 13.
Air valve gasket (20) or air cover gasket
(10) is damaged.
Inspect; replace. See pages 12 to 13,
18 to 19.
Pump leaks fluid externally from ball
check valves.
Loose manifolds (50 or 53), damaged
o-ring (102) between manifold and seat.
Tighten manifold bolts (54), or replace
o-rings (102). See page 14.