Technical data
TROUBLESHOOTiNG GUIDE ;z’r:f$.:,;:::,,: ;f, ,i,:” :; :I-‘; >‘.< i ;1 _ ,; i ;‘:, ii 5
WARNING
Pressure Relief Procedure
To reduce the risk of serious bodily injury, including fluid injection, splashing fluid in the eyes or on the skin, or in-
jury from 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.
4.
Disengage the gun safety latch.
5.
Hold a metal part of the gun firmly to the side of a metal pail, and trigger the gun to relieve pressure.
6.
Engage the gun safety latch.
7. Open the drain valve.
8.
Leave the 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 after
following the steps above,
VERY SLOWLY loosen the tip guard retaining nut or hose end coupling and relieve
pressure gradually, then loosen completely. Now clear the tip or hose.
YPE OF PROBLEM
WHAT TO CHECK
If check is OK, go to next check When check is not OK refer to this columr
I
IOTOR WON’T OPERATE
asic Fluid
Pressure Problems
I. Check the pressure control knob setting. The
motor will not run if it is at the minimum set-
ting (fully counterclockwise).
I. Slowly increase the pressure setting to see if
the motor starts.
2. Check for a clogged spray tip. Refer to your
separate gun or tip instruction manual.
lasic Mechanical Problems
1. Check for frozen or hardened fluid in the
pump (39) and/or pressure control bourdon
tube. Using a screwdriver, carefully try to
rotate fan at back of motor by hand. See
page 22.
basic Electrical Problems
1. Check sprayer circuit breaker (303) button to
be sure it has not popped up.
WHAT TO DO
2. Relieve pressure, refer to your 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, replace the displacement
pump packings (see manual 307-793) and/or
replace the bare pressure control box (301 P.
See page 26.
2. Check displacement pump connecting rod
pin L?CH. It must be completely pushed into
connecting rod l29) and spring retainer (35)
should be firmly in groove of connecting rod,
Sea page 28.
2. Push pin into place and secure with the
spring retainer.
3. Check for motor damage. Remove drive
housing assembly (18). Try to rotate fan by
hand. See page 29
2. Replace motor (1) if fan won’t turn.
1. Depress circuit breaker button to reset. If
circuit breaker continues to open, see “Elec-
trical Short”, page 18.
2. Check electrical supply with volt meter.
Meter should read 105 to 125 VAC.
3. Check extension cord for visible damage.
Use a volt meter or test lamp at extension
cord outlet to check.
2. Reset building circuit breaker; replace
building fuse. Try another electrical outlet.
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 23.
5. Check motor brush leads, terminals and
brush length. Brush length should be l/2”
minimum. See page 22.
5. Tighten terminal screws; replace brushes.
Sea page 22.
‘Thaw the sprayer if water or water-based fluid 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 fluid hardened (dried) in
the sprayer, the pump packings and/or bare pressure control
must be replaced. See page 26 or manual 307-793.
When replacing the bare pressure control box (item 3011,
remove the circuit breaker, ON/OFF switch, bridge, circuit
board
and electrical hardware and reinstall these parts in the
bare box.
Troubleshooting continued on next page.
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