Troubleshooting Guide; Motor Won't Operate - Graco 231–081 Instructions And Parts List

Pressure Relief Procedure
To reduce the risk of serious bodily injury , including
fluid injection, injury from splashing fluid or solvent in
the eyes or on the skin, moving parts or electric shock,
always follow this procedure whenever you shut off the
sprayer, when checking or servicing any part of the
spray system, when installing, 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.
Check everything in the guide before disassembling the sprayer.

MOTOR WON'T OPERATE

TYPE OF PROBLEM
Basic Fluid Pressure Problems
Basic Mechanical Problems
Basic Electrical Problems
Thaw the sprayer if water or water–based material 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 material hardened (dried) in the sprayer, the pump packings and/or pressure control must be replaced. See page
36 or page 29.
307–920

TROUBLESHOOTING GUIDE

WARNING
WHAT TO CHECK
If check is OK, go to the next check.
1. Check the pressure control knob setting.
The motor will not run if it is at the mini-
mum setting (fully counterclockwise).
2. Check for a clogged spray tip. See your
separate gun or tip instruction manual.
1. Check for frozen or hardened material in
the pump (39) and/or pressure control
bourdon tube. Using a screwdriver, care-
fully try to rotate fan at back of motor by
hand. See page 22.
2. Check displacement pump connecting
rod pin (20). It must be completely pushed
into connecting rod (3) and retaining
spring (35) must be firmly in groove of
connecting rod. See page 32.
3. Check for motor damage. Remove drive
housing assembly (2). See page 33. T ry
to rotate fan by hand.
1. Check sprayer circuit breaker (309) but-
ton 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 outlet to check.
4. Check sprayer power supply cord (311)
for visible damage such as broken insula-
tion 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 trigger 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 pressure
drain 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 af -
ter following the steps above, wrap a rag around the tip
guard retaining nut or hose end coupling and VER Y
SLOWLY loosen the part to relieve pressure gradually,
then loosen completely. Now clear the obstruction.
WHAT TO DO
If 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 your separate gun
or tip instruction manual for tip cleaning.
1. Thaw . Plug in sprayer and turn on. Slowly in-
crease pressure setting to
starts. If it doesn't, replace the displacement
pump packings (see page 36) and/or re-
place the pressure control (301) . See page
29.
2. Push pin into place and secure with the
spring retainer.
3. Replace motor (1) if fan won't turn.
1. Depress button to reset. If circuit breaker
continues to open, see 'Electrical Short' on
page 22.
2. Reset building circuit breaker; replace build-
ing fuse. Try another electrical outlet.
3. Replace extension cord.
4. Replace power supply cord. See page 26.
5. T ighten terminal screws; replace brushes.
See page 25.
see if motor