Graco A Series Instructions-Parts List Manual page 17

Intermediate Problem Solving
TYPE OF PROBLEM
Spray Pattern Variations
Motor Is Hot and Runs
Intermittently
Building Circuit Breaker
Opens As Soon As Sprayer
Switch Is Turned On.
Circuit breaker opens after
sprayer operates for 5 to
10 minutes.
Building circuit breaker
opens as soon as sprayer
is plugged into outlet and
sprayer is NOT turned on.
Troubleshooting
WHAT TO CHECK
If check is OK, go to next check
1. Spray tip worn beyond sprayer pressure capa-
bility.
2. Check transducer (29) for wear or damage.
3. Check pressure control (64) for smooth opera-
tion.
4. Check LOW OUTPUT section, page 15.
1. Determine if sprayer was operated at high pres-
sure with small tips, which causes excessive
heat build up.
2. Be sure ambient temperature where sprayer is
located is no more than 32 C and sprayer is
not located in direct sun.
3. Check motor. (See NOTE 1, page 13.)
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 35.
2. Check for missing motor brush inspection plate
gasket (see page 20), bent terminal forks or
other metal to metal contact points which
could cause a short.
3. Check motor armature for shorts. Use an arma-
ture tester (growler) or perform motor test. See
page 19. Inspect windings for burns.
4. Check motor start board (47) by substituting
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 Problems – Electrical' on page
13.
1. Check wiring for correct connections.
2. Check ON/OFF switch (52). Be sure sprayer is
unplugged! Disconnect wires from switch.
Check switch with ohmmeter. The reading
should be infinity with ON/OFF switch OFF, and
zero with switch ON.
CAUTION: A short in motor circuit can damage
switch and/or motor start board (47).
3. Check power supply cord (57). Disconnect
black and white power inlet filter terminals;
connect volt meter to these leads. Plug in
sprayer. Meter should read 90–110 VAC. Un-
plug sprayer.
WHAT TO DO
When check is not OK, refer to this column
1. Replace spray tip.
NOTE: A smaller size tip will provide longer
life.
2. Replace transducer. See page 31.
3. Replace pressure control. See page 30.
1. Decrease pressure setting or increase tip
size.
2. Move sprayer to shaded, cooler area if
possible.
3. Replace motor. See page 26.
1. Repair or replace any damaged wiring or
terminals. Securely reconnect all wires.
2. Correct faulty conditions.
3. Replace motor. See page 26.
4. Replace board. See page 27.
1. Correct improper connections.
2. Replace ON/OFF switch. See page
3. Replace power supply cord.
.