Troubleshooting
Troubleshooting
Troubleshooting
Troubleshooting
••• Follow
Follow
Follow the
the
the
Pressure
Pressure
Pressure Relief
Relief
Relief Procedure,
Procedure,
Procedure, page
page
page 12
12
12
,,,
before
before
before checking
checking
checking or
or
or servicing
servicing
servicing the
the
the equipment.
equipment.
equipment.
••• Check
Check
Check all
all
all possible
possible
possible problems
problems
problems and
and
and causes
causes
causes before
before
before
disassembly.
disassembly.
disassembly.
See the Operation Manual (3A3167) for troubleshooting or error information on the Graco Motor Control.
Problem
Problem
Problem
Cause
Cause
Cause
Solution
Solution
Solution
Pump is running too fast, causing
cavitation before prime.
Slow down the motor controller (VFD
or Graco Motor Control)
Center section has no air pressure,
or air pressure is too low.
Apply air pressure to center section
per your application requirements.
Check valve ball is severely worn or
wedged in seat or manifold.
Replace the ball and seat.
Insufficient suction pressure
Increase suction pressure. See
manual 3A3167.
Seat is severely worn.
Replace the ball and seat.
Outlet or inlet is restricted.
Remove the restriction.
Inlet fittings or manifolds are loose.
Tighten.
Pump cycles but will not
prime and/or pump.
Manifold o-rings are damaged.
Replace o-rings.
The center section is
excessively hot.
The drive shaft is broken.
Replace.
Check valve balls, seats, or o-rings
are worn.
Replace.
Manifold clamps or fluid cover
clamps are loose.
Tighten.
Pump fails to hold fluid
pressure at stall.
Diaphragm shaft bolt is loose
Tighten.
Motor or controller is wired
improperly.
Wire per manual.
Pump will not cycle.
The leak detector (if installed) has
tripped.
Check diaphragm for rupture or
incorrect installation. Repair or
replace.
Suction line is clogged.
Inspect; clear.
Check balls are sticky or leaking .
Clean or replace.
Pump flow rate is erratic.
Diaphragm (or backup) ruptured.
Replace.
Pump makes unusual noises.
Pump is operating near or at stall
pressure.
Adjust air pressure or slow the pump
speed.
A fitting is loose.
Tighten. Inspect thread sealant.
Loose or damaged o-rings or shaft
seal.
Replace.
Air consumption is higher
than expected.
Diaphragm (or backup) ruptured.
Replace.
10
3A3168R
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