14
308–030
TROUBLESHOOTING GUIDE
WARNING
Pressure Relief Procedure
To reduce the risk of serious bodily injury, including
fluid injection, splashing in the eyes or on the skin,
or injury from moving parts, always follow this proce-
dure when you shut off the sprayer, when checking,
adjusting or cleaning the system, and when chang-
ing spray tips.
1.
Engage the gun safety latch.
2.
Turn the engine stop lever to OFF.
3.
Unplug the power supply cord.
4.
Disengage the gun safety latch. Hold a metal part
of the gun firmly to the side of a grounded metal
pail, and trigger the gun.
5.
Engage the gun safety latch.
6.
Open the fluid pressure drain valve and leave it
open until you start the sprayer again.
If you suspect the hose or spray tip is completely
clogged or that pressure is not fully relieved after
following the steps above,
VERY SLOWLY loosen
the tip guard retaining nut of hose end coupling to
relieve pressure gradually. Now clear the tip or hose.
Check everything in the chart before disassembling the sprayer.
PROBLEM
CAUSE
SOLUTION
Electric motor won’t run
Power cord or extension cord unplugged,
or damaged, or building circuit breaker or
fuse has tripped
Check, reset or replace.
Motor overload switch
1
has opened
Unplug power supply cord, relieve pressure, al-
low motor to cool, decrease pressure.
Pressure setting too low
Increase pressure.
Pressure control frozen or damaged by
over–pressurization
Try to thaw
2
, or replace pressure control.
Electric motor stops while spraying
Power cord or extension cord unplugged,
or damaged, or building circuit or fuse is
blown
Check, reset or replace.
Motor overload switch* has opened
Unplug the power supply cord, relieve pressure,
allow motor to cool, decrease pressure.
Pressure setting too low
Increase pressure.
Spray tip or plugged
Remove and clean.
Wrong type extension cord
Use maximum 100 foot (30 m), 3 wires, 12
gauge, grounded extension cord.
Electric motor runs, but low paint
output or no paint output, and
pump is not stroking
Piston ball check not seating
Service the pump. See page 16.
See the PROBLEM, “Not enough
paint pressure”, on page 15, also
Piston packings worn or damaged
Replace the piston. See page 16.
Intake valve ball check not seating
Service the pump. See page 16.
.
Pump is frozen
Thaw
2
Pressure control frozen or damaged by
overpressurization
3
Try to thaw
2
, or replace pressure control.
Drive assembly damaged
Replace the drive housing. See page 22.
Displacement pump worn or damaged
Replace the displacement pump. See page 16.
Sprayer is not primed.
Prime the sprayer. See page 10.
Electric motor labors when starting,
and trips building circuit breaker or
fuse
Circuit board has failed
Replace the circuit board. See page 18.
Motor capacitor has failed
Replace the capacitor. See page 23.
Summary of Contents for PRO 301
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