11
310944
Troubleshooting
MOTOR IS HOT AND RUNS INTERMITTENTLY
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
Motor is hot and runs intermit-
tently.
1. Determine if sprayer was operated at high
pressure with small tips, which causes low
motor RPM and excessive heat build up.
1. Decrease pressure setting or increase tip
size.
2. Be sure ambient temperature where sprayer
is located is no more than 90
_
F and sprayer
is not located in direct sun.
2. Move sprayer to shaded, cooler area if
possible.
ELECTRICAL SHORT
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
Building circuit breaker opens
as soon as sprayer switch is
turned on.
1. All electrical wiring for damaged insulation,
and all terminals for loose fit or damage. Also
wires between pressure control and motor.
See page 28.
1. Repair or replace any damaged wiring or
terminals. Securely reconnect all wires.
CAUTION
Any short in any part of the mo-
2. For missing inspection plate gasket, bent ter-
minal forks or other metal-to-metal contact
points which could cause a short.
2. Correct faulty conditions.
Any short in any part of the mo-
tor power circuit will cause the
control circuit to inhibit sprayer
operation. Correctly diagnose
and repair all shorts before
3. Motor armature for shorts. Use an armature
tester (growler) or perform spin test, page 12.
Inspect windings for burns.
3. Replace motor, page 28.
and repair all shorts before
checking and replacing control
board.
4. Pressure control board (100) by performing
motor control board diagnostics, page 24. If
diagnostics indicate, substitute with a good
board.
CAUTION:
Do not perform this check until
motor armature is determined to be good. A
bad motor armature can burn out a good
board.
4. Replace with a new motor control board
(100), page 24.
Building circuit breaker opens
as soon as sprayer is plugged
1. Basic Electrical Problems, page NO TAG.
1. Perform necessary procedures.
as soon as sprayer is plugged
into outlet and sprayer is NOT
turned on.
2. ON/OFF switch (86), page 16.
Be sure spray-
er is unplugged!
Disconnect wires from
switch. Check switch with ohmmeter. Reading
must be infinity with ON/OFF switch OFF, and
zero with switch ON.
2. Replace ON/OFF switch, page 16.
3. For damaged or pinched wires in pressure
control, page 24.
3. Replace damaged parts, page 24.
Sprayer quits after sprayer op-
erates for 5 to 10 minutes.
1. Basic Electrical Problems, page NO TAG.
1. Perform necessary procedures.
2. Electrical supply with volt meter.
Meter must read 85--130 Vac for 100--120 Vac
models and 210--255 Vac for 220--240 Vac
models.
2. If voltage is too high, do not operate
sprayer until corrected.
3. Tightness of pump packing nut. Over tighten-
ing tightens packings on rod, restricts pump
action, and damages packings.
3. Loosen packing nut. Check for leaking
around throat. Replace pump packings, if
necessary, page 29.
