7
TROUBLESHOOTING CHART
Pressure Relief Procedure
To reduce the risk of serious bodily injury, including splashing fluid or solvent in the eyes or on the skin, always
shut off the air to the pump, open the fluid control valve, if used, and open the drain valve, to relieve all system
pressure before checking, adjusting, cleaning or repairing any part of the system.
WARNING
PROBLEM
CAUSE
SOLUTION
Pump will not cycle or cycles once
Sticky air director valve (52).
1. Check both spools for
and stops.
freedom of movement;
clean, oil, or replace.
2. Inspect actuator pin (27) and
diaphragm shaft (1) for
damage.
Clogged air or fluid passageway.
Clear.
Air director valve caps (30, 33) or
Check and correct. See page 8.
plates (23, 37) installed incorrectly
or worn.
Pump cycles at stall or fails to hold
Leaky check valves (18).
Repair or replace. See page 11.
pressure at stall.
Worn shaft seals (4).
Replace. See page 9.
Loose fluid fitting.
Check and correct.
Worn air director valve (52).
Repair or replace. See page 8.
Pump operates erratically.
Clogged or leaking suction line.
Inspect for leaks, or clear.
Sticky air director valve (52).
Check. See page 8.
Sticky check valve balls (19).
Clean or repair. See page 11.
Diaphragm (7) damaged.
Replace. See page 10.
Air bubbles in fluid.
Suction line loose.
Tighten.
Fluid inlet seals worn or damaged.
Check; repair.
Diaphragm (7) ruptured.
Replace. See page 10.
Fluid in exhaust air.
Diaphragm plate (8) loose.
Tighten.
Diaphragm (7) ruptured.
Replace. See page 10.
Pump exhausts excessive air
Air director valve screws (22, 35, 39)
Tighten.
at stall.
loose.
Air director valve caps (30, 33)
Inspect; replace. See page 8.
damaged.
Worn or damaged air director
Repair or replace. See page 8.
valve (52).
Worn shaft seals (4).
Inspect; replace. See page 9.
Pump leaks fluid externally from
Worn or damaged o–rings (17).
Inspect; replace. See page 11.
check valves.
Manifold bolts (14) loose.
Tighten.
Pump won’t prime or won’t
Suction line loose.
Tighten.
hold prime.
Excessive suction lift.
Shorten.
Inlet check balls (19) worn.
Replace. See page 11.
Suction line clogged.
Clear.
Outlet line clogged or dispense device
Clear or open.
closed.
NOTE:
Check all other possible remedies before disassembling the pump.
