Troubleshooting - Graco husky 3275 Instruction Manual

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.
NOTE: Check all possible problems and causes before you disassemble the pump.
PROBLEM
Pump cycles at stall or fails to hold pres-
sure at stall.
Pump will not cycle, or cycles once and
stops.
Pump operates erratically.
Air bubbles in fluid.
Fluid in exhaust air.
Pump leaks air externally.
Pump leaks fluid externally from ball
check valves.

Troubleshooting

WARNING
CAUSE
Worn check valve balls (201), seats
(101) or o-rings (102).
Air valve is stuck or dirty.
Check valve ball (201) severely worn
and wedged in seat (101) or manifold
(50 or 53).
Check valve ball (201) is wedged into
seat (101), due to overpressurization.
Dispensing valve is clogged.
Suction line is clogged.
Sticky or leaking check valve balls
(201).
Diaphragm (301) is ruptured.
Restricted exhaust.
Suction line is loose.
Diaphragm (301) is ruptured.
Loose inlet manifold (53), damaged seal
between manifold and seat (101), or
damaged o-rings (101).
Loose diaphragm shaft bolt (14).
Damaged o-ring (102).
Diaphragm (301) is ruptured.
Loose diaphragm shaft bolt (14).
Damaged o-ring (102).
Air valve cover screws (3) are loose.
Air valve gasket (20) or air cover gasket
(10) is damaged.
Loose manifolds (50 or 53), damaged
o-ring (102) between manifold and seat.
SOLUTION
Replace. See page 14.
Disassemble and clean air valve. See
pages 12 to 13. Use filtered air.
Replace ball and seat. See page 14.
Install a pressure relief valve
(see page 7).
Relieve pressure and clear valve.
Inspect; clear.
Clean or replace. See page 14.
Replace. See pages 15 to 17.
Remove restriction.
Tighten.
Replace. See pages 15 to 17.
Tighten manifold bolts (54), or replace
seats (101) or o-rings (102). See
page 14.
Tighten or replace. See pages 15 to 17.
Replace. See pages 15 to 17.
Replace. See pages 15 to 17.
Tighten or replace. See pages 15 to 17.
Replace. See pages 15 to 17.
Tighten screws. See page 13.
Inspect; replace. See pages 12 to 13,
18 to 19.
Tighten manifold bolts (54), or replace
o-rings (102). See page 14.
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