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TROUBLESHOOTING GUIDE
WARNING
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 spray-
ing.
1. Engage the gun safety latch.
2. Turn the ON/OFF switch to OFF.
3. Unplug the power supply cord.
4.
Disengage the gun safety latch. Hold a metal
part of the gun firmly to a grounded metal pail.
Trigger the gun to relieve pressure.
5. Engage the gun safety latch.
6. Open the pressure drain valve, having a con-
tainer 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 com
-
pletely clogged, or that pressure has not been fully
relieved after following the steps above, VERY
SLOWLY loosen the tip guard retaining nut or hose
end coupling to relieve pressure gradually, then
loosen completely. Now clear the tip or hose ob-
struction.
Check everything in the guide before disassembling the pump.
MOTOR WON’T OPERATE
TYPE OF PROBLEM
WHAT TO CHECK
If check is OK, go to next check
WHAT TO DO
When check is not OK refer to this column
Basic Fluid Pressure Problems
1. Check the pressure control knob setting. The
motor will not run if it is at the minimum setting
(fully counterclockwise).
1. Slowly increase the pressure setting to see
if the motor starts.
2. Check for a clogged spray tip. Refer to the
separate gun or tip instruction manual.
2. Relieve pressure, refer to the separate gun
or tip instruction manual for tip cleaning.
Basic Mechanical Problems
1. Check for frozen or hardened paint in the
pump (74) and/or pressure control tube. Us-
ing a screwdriver, carefully try to rotate fan at
back of motor by hand. See page 22.
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. Check displacement pump connecting rod
pin (43). It must be completely pushed into
connecting rod (70) and retaining spring (42)
must be firmly in groove of connecting rod.
See Fig 38–3.
2. Push pin into place and secure with the
spring retainer.
3. Check for motor damage. Remove drive
housing assembly (73). See page 33. Try to
rotate fan by hand.
3. Replace motor (75) if fan won’t turn. See
page 34.
Basic Electrical Problems
1. Check sprayer circuit breaker (309) button to
be sure it has not popped up.
1. Depress button to reset. If circuit breaker
continues to open, see ‘Electrical Short’ on
page 21.
2. Check electrical supply with volt meter. Meter
should read 105–125 VAC.
2. Reset building circuit breaker; replace
building fuse. Try another outlet.
3. Check extension cord for visible damage.
Use a volt meter or test lamp at extension cord
outlet to check.
3. Replace extension cord.
4. Check sprayer power supply cord (311) for
visible damage such as broken insulation or
wires.
4. Replace power supply cord. See page 20.
5. Check motor brush leads, terminals and
brush length. Brush length should be 1/2”
minimum. See page 25.
5. Tighten terminal screws; replace brushes.
See page 25.
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).
