Troubleshooting - Graco 231–373 Instructions-Parts List Manual

Pressure Relief Procedure
To reduce the risk of serious bodily injury, including fluid in-
jection, splashing fluid or solvent in the eyes or on the skin,
or injury from moving parts or electric shock, always follow
this procedure whenever you shut of f the sprayer , when
checking or servicing any part of the spray system, when in-
stalling, cleaning or changing spray tips, and whenever you
stop spraying.
1. Engage the gun safety latch.
2. Turn the ON/OFF switch to OFF.
3. Unplug the power supply cord.
Perform all Troubleshooting procedures before disassembling the sprayer.
MOTOR WON'T OPERATE
TYPE OF PROBLEM
Basic Fluid Pressure Problems 1. Check the pressure control knob setting. The
Basic Mechanical Problems
Basic Electrical Problems
NOTE 1: Thaw the sprayer if water or water-based paint has frozen in it, due to exposure to low temperatures, by placing it in a warm
area. Do not try to start the sprayer until it has thawed completely. If paint hardened (dried) in the sprayer, the pump packings and/or
pressure control must be replaced. See page 30 (Displacement Pump) or 23 (Pressure Control).

Troubleshooting

WHAT TO CHECK
If check is OK, go to next check
motor will not run if it is at the minimum setting
(fully counterclockwise).
2. Check for a clogged spray tip or fluid filter. Re-
fer to the separate gun, tip, or fluid filter in-
struction manual.
1. Check for frozen or hardened paint in the
pump (76) and/or pressure control tube. Using
a screwdriver, carefully try to rotate fan at back
of motor by hand. See page 18.
2. Check displacement pump connecting rod pin
(43). It must be completely pushed into con-
necting rod (68) and retaining spring (42) must
be firmly in groove of connecting rod. See Fig.
32.
3. Check for motor damage. Remove drive
housing assembly (67). See page 26. T ry to
rotate fan by hand.
1. Check pressure control safety circuit.
2. Check electrical supply with volt meter. Meter
should read 105–125 VAC.
3. Check extension cord for damage. Check ex-
tension cord continuity with a volt meter.
4. Check sprayer power supply cord (314) for
damage such as broken insulation or wires.
5. Check motor brush leads, terminals and brush
length. Brush length should be 1/2" minimum.
See page 20.
4. Disengage the gun safety latch. Hold a metal part of the
gun firmly to the side of a grounded metal pail, and trig-
ger the gun to relieve pressure.
5. Engage the gun safety latch.
6. Open the pressure drain valve, having a container
ready to catch the drainage. Leave the valve open until
you are ready to spray again.
If you suspect that the spray tip or hose is completely
clogged, or that pressure has not been fully relieved after fol -
lowing the steps above, VERY SLOWLY loosen the tip guard
retaining nut or hose coupling to relieve pressure gradually,
then loosen completely. Now clear the tip or hose.
WHAT TO DO
When check is not OK refer to this column
1. Slowly increase the pressure setting to see
if the motor starts.
2. Relieve pressure, refer to the separate gun,
tip, or fluid filter instruction manual for
cleaning.
1. Thaw. Plug in sprayer and turn on. Slowly
increase pressure setting to see if motor
starts. If it doesn't, see NOTE 1, below.
2. Push pin into place and secure with spring
retainer.
3. Replace motor (73) if fan won't turn. See
page 28.
2. Turn pressure control ON/OFF switch to
OFF to RESET. If the pressure control safe-
ty continues to trip, see ELECTRICAL
SHORT on page 17.
2. Reset building circuit breaker; replace
building fuse. Try another outlet.
3. Replace extension cord.
4. Replace power supply cord. See page 21.
5. Tighten terminal screws; replace brushes.
See page 20.
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