Troubleshooting Guide; Motor Won't Operate - Graco 231-043 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.

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 the bourdon tube was not damaged by the freezing, the pump
should operate. If paint hardened (dried) in the sprayer, the pump packings and/or bare pressure control must be replaced. See page
36 (pump) or 29 (pressure control).

TROUBLESHOOTING GUIDE

Check everything in the guide before disassembling the sprayer.
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. Refer to the
separate gun or tip instruction 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 22.
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
38–3.
3. Check for motor damage. Remove drive
housing assembly (67). See page 33. T ry to
rotate fan by hand.
1. Check sprayer circuit breaker (309) button to
be sure it has not popped up.
2. Check electrical supply with volt meter. Meter
should read 105–125 VAC.
3. Check extension cord for visible damage. Use
a volt meter or test lamp at extension cord out-
let to check.
4. Check sprayer power supply cord (31 1) 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 25.
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
or tip instruction manual for tip 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 34.
1. Depress button to reset. If circuit breaker
continues to open, see 'Electrical Short' on
page 21.
2. Reset building circuit breaker; replace
building fuse. Try another outlet.
3. Replace extension cord.
4. Replace power supply cord. See page 26.
5. Tighten terminal screws; replace brushes.
See page 25.
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