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INJECTION HAZARD
To reduce the risk of serious injury, whenever you are instructed to relieve pressure, follow the Pres-
sure Relief Procedure on page 8.
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 manual 307–806 (Displacement Pump) or page 22 (Pressure Control).
Troubleshooting
WARNING
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 17.
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.
25.
3. Check for motor damage. Remove drive
housing assembly (67). See page 25. 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 19.
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 27.
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 16.
2. Reset building circuit breaker; replace
building fuse. Try another outlet.
3. Replace extension cord.
4. Replace power supply cord. See page 20.
5. Tighten terminal screws; replace brushes.
See page 19.
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