16
307-889
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 32
C (
90
F) and
sprayer is not located in direct sun.
2. Move sprayer to shaded, cooler area if pos-
sible.
3. Determine if sprayer was turned on, pressur-
ized, but not operating for long periods of time.
3 Turn off sprayer whenever you stop spray-
ing for a while and relieve fluid pressure.
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. Check all electrical wiring for damaged insula-
tion, and all terminals for loose fit or damage.
Also check wires between pressure control
and motor which are encased in conduit (1).
See page 26.
1. Repair or replace any damaged wiring or
terminals. Securely reconnect all wires.
2. Check for missing inspection plate gasket
(see page 26), bent terminal forks or other
metal to metal contact points which could
cause a short.
2. Correct faulty conditions.
3. Check motor armature for shorts. Use an ar-
mature tester (growler) or perform spin test.
See page 16. Inspect windings for burns.
3. Replace motor. See page 26.
4. Check pressure control board (301) by substi-
tuting with a good control board. See page 22.
4. Replace with a new pressure control board
(301). See page 22.
1. Check Basic Electrical Problems on page 12. 1. Perform necessary procedures.
2. Check ON/OFF switch (307) See page 21.
Be
sure the sprayer is unplugged! Disconnect
wires from switch. Check switch with ohmme-
ter. The reading should be infinity with the ON/
OFF switch OFF, and zero with the switch ON.
2. Replace ON/OFF switch. See page 21.
3. Check for damaged or pinched wires in the
pressure control. See page 22.
3. Replace damaged parts. See page 22.
Sprayer quits after sprayer op-
erates for 5 to 10 minutes.
1. Check Basic Electrical Problems on page 12. 1. Perform necessary procedures.
2. Check electrical supply with volt meter. Meter
should read 200 to 250 VAC.
2. If voltage is too high, do not operate
sprayer until corrected.
3. Check tightness of pump packing nut. Over-
tightening tightens packings on rod, restricts
pump action, and damages packings.
3. Loosen packing nut. Check for leaking
around throat. Replace pump packings, if
necessary. See page 28.
Spin Test
WARNING
ELECTRIC SHOCK HAZARD
Do not touch the brushes, leads, springs
or brush holders while the sprayer is
plugged in to reduce the risk of electric
shock and serious bodily injury.
WARNING
INJECTION HAZARD
To reduce the risk of serious injury,
follow the illustrated
Pressure Relief
Procedure
warning on page 12 when-
ever you are instructed to relieve pressure.
CAUTION
Any short in any part of the
motor power circuit will cause
the control circuit to inhibit
sprayer operation. Correctly
diagnose and repair all shorts
before checking and replac-
ing control board.
Building circuit breaker opens
as soon as sprayer is plugged
into outlet and sprayer is NOT
turned on.