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11
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 when 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 disassembling the pump.
PROBLEM
CAUSE
SOLUTION
Pump cycles at stall or fails to hold pres-
sure at stall.
Worn check valve balls (301), seats
(201) or o-rings (202).
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 (301) severely worn
and wedged in seat (201) or manifold
(102 or 103).
Replace ball and seat. See page 14.
Check valve ball (301) is wedged into
seat (201), due to overpressurization.
Install Pressure Relief Valve
(see page 7).
Dispensing valve clogged.
Relieve pressure and clear valve.
Pump operates erratically.
Clogged suction line.
Inspect; clear.
Sticky or leaking check valve balls
(301).
Clean or replace. See page 14.
Diaphragm ruptured.
Replace. See pages 15 to 17.
Restricted exhaust.
Remove restriction.
Air bubbles in fluid.
Suction line is loose.
Tighten.
Diaphragm ruptured.
Replace. See pages 15 to 17.
Loose inlet manifold (102), damaged
seal between manifold and seat (201),
or damaged o-rings (202).
Tighten manifold bolts (106) or replace
seats (201) or o-rings (202). See page
14.
Loose diaphragm shaft bolt (107).
Tighten or replace. See pages 15 to 17.
Damaged o-ring (108).
Replace. See pages 15 to 17.
Fluid in exhaust air.
Diaphragm ruptured.
Replace. See pages 15 to 17.
Loose diaphragm shaft bolt (107).
Tighten or replace. See pages 15 to 17.
Damaged o-ring (108).
Replace. See pages 15 to 17.
Pump exhausts excessive air at stall.
Worn air valve block (7), o-ring (6),
plate (8), pilot block (18), u-cups (10), or
pilot pin o-rings (17).
Repair or replace. See pages 12 to 13.
Worn shaft seals (402).
Replace. See pages 15 to 17.
Pump leaks air externally.
Air valve cover (2) or air valve cover
screws (3) are loose.
Tighten screws. See page 13.
Air valve gasket (4) or air cover gasket
(22) is damaged.
Inspect; replace. See pages 12 to 13,
18 to 19.
Air cover screws (3) are loose.
Tighten screws. See pages 18 to 19.
Pump leaks fluid externally from ball
check valves.
Loose manifolds (102, 103), damaged
seal between manifold and seat (201),
or damaged o-rings (202).
Tighten manifold bolts (106) or replace
seats (201) or o-rings (202). See page
14.
