Graco ULTRA MAX 1095 Instructions-Parts List Manual page 15

MOTOR IS HOT AND RUNS INTERMITTENTLY
TYPE OF PROBLEM
Motor is hot and runs intermit-
tently.
ELECTRICAL SHORT
TYPE OF PROBLEM
Building circuit breaker opens
as soon as sprayer switch is
turned on.
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.
Sprayer quits after sprayer op-
erates for 5 to 10 minutes.
.
Troubleshooting
WHAT TO CHECK
If check is OK, go to next check
1. Determine if sprayer was operated at high
pressure with small tips, which causes low
motor RPM and excessive heat build up.
2. Be sure ambient temperature where sprayer
is located is no more than 90 F and sprayer
is not located in direct sun.
3. Determine if sprayer was turned on, pressur-
ized, but not operating for long periods of time.
WHAT TO CHECK
If check is OK, go to next check
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. See page 27.
2. Check for missing inspection plate gasket
(see page 27), bent terminal forks or other
metal to metal contact points which could
cause a short.
3. Check motor armature for shorts. Use an ar-
mature tester (growler) or perform spin test.
See page 17. Inspect windings for burns.
4. Check motor control board (104) by perform-
ing motor control board diagnostics on page
21. 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.
1. Check Basic Electrical Problems on page 11. 1. Perform necessary procedures.
2. Check ON/OFF switch (80) See page 19. Be
sure sprayer is unplugged! Disconnect wires
from switch. Check switch with ohmmeter
The reading must be infinity with the ON/OFF
switch OFF, and zero with the switch ON.
3. Check for damaged or pinched wires in the
pressure control. See page 21.
1. Check Basic Electrical Problems on page 11. 1. Perform necessary procedures.
2. Check electrical supply with volt meter. Meter
must read 105 to 125 VAC.
3. Check tightness of pump packing nut. Over
tightening tightens packings on rod, restricts
pump action, and damages packings.
WHAT TO DO
When check is not OK refer to this column
1. Decrease pressure setting or increase tip
size.
2. Move sprayer to shaded, cooler area if pos-
sible.
3 Turn off sprayer whenever you stop spray-
ing for a while and relieve fluid pressure.
WHAT TO DO
When check is not OK refer to this column
1. Repair or replace any damaged wiring or
terminals. Securely reconnect all wires.
2. Correct faulty conditions.
3. Replace motor. See page 27.
4. Replace with a new pressure control board
(104). See page 21.
2. Replace ON/OFF switch. See page 19.
.
3. Replace damaged parts. See page 21.
2. If voltage is too high, do not operate
sprayer until corrected.
3. Loosen packing nut. Check for leaking
around throat. Replace pump packings, if
necessary. See page 29.