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18 308801
Intermediate Problem Solving
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
Spray Pattern
Variations
(continued)
3. Check pressure adjustment potentiometer (77) by
replacing it with a new one.
(continued)
4. Check Low Output section, page 16.
Motor Is Hot and
Runs Intermittently
1. Determine if sprayer was operated at high pressure
with small tips, which causes excessive heat build
up.
1. Decrease pressure setting or increase tip
size.
2. Be sure ambient temperature where sprayer is lo-
cated is no more than 90
_F (32_C) and sprayer is
not located in direct sun.
2. Move sprayer to shaded, cooler area if
possible.
3. Check motor. 3. Replace motor. See page 23.
Building Circuit
Breaker Opens As
Soon As Sprayer
Switch Is Turned
1. Check all electrical wiring for damaged insulation,
and all terminals for loose fit or damage.
Also check wires between pressure transducer
and motor. See page 23.
1. Repair or replace any damaged wiring or
terminals. Securely reconnect all wires.
On.
2. Check for missing motor brush inspection plate
gasket (see page 21), 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
armature tester (growler) or perform motor test.
See page 18. Inspect windings for burns.
3. Replace motor. See page 23.
4. Check motor control board (22a) by performing
motor control board diagnostics on 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 board. See page 24.
Circuit breaker
opens after sprayer
operates for 5 to 10
minutes.
1. Check ‘Basic Problems – Electrical’ on page 14.
Building circuit
breaker opens as
soon as sprayer is
plugged into outlet
and sprayer is NOT
turned on.
1. Check ON/OFF switch (80). 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 control board (22a).
1. Replace ON/OFF switch. See page 25.
2. Check for damaged or pinched wires in junction
box (20).
2. Replace damaged parts.
Unit will not run on
generator but does
run on AC power
1. Check the generator’s “peak” voltage. This sprayer
will not run if the peak voltage is above 190V or
below 100V.
1. Use AC power or a different generator.