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MOTOR
IS HOT
AND RUNS INTERMITTENTL
Y
TYPE
OF PROBLEM
WHAT
T
O CHECK
If check is OK, go to next check
WHA
T T
O DO
When check is not OK refer to this column
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.
3. Determine
if was sprayer turned on, pressur
-
ized,
but not operating for long periods of time.
3 Turn
of
f
sprayer whenever you stop spray
-
ing
for a while and relieve fluid pressure.
ELECTRICAL
SHORT
TYPE
OF PROBLEM
WHAT
T
O CHECK
If check is OK, go to next check
WHA
T T
O 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 34.
1. Repair or replace any damaged wiring or
terminals.
Securely reconnect all wires.
2. Check for missing inspection plate gasket
(see page 25), 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 22. Inspect windings for burns.
3.
Replace motor
. See page 34.
4. Check bridge (308) by substituting with a
good
bridge or by performing
bridge test. See
pages
23 or 27.
CAUTION: Do not check bridge until arma-
ture
is determined to
be good. A bad armature
will
immediately burn out a good bridge.
4.
Replace bridge. See page 27.
1. Check ‘Basic Electrical Problems’ on page
16.
2. Check
ON/OFF switch (303) See page 26.
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.
CAUTION: A short
in the motor circuit burns
the bridge out immediately, which usually
causes
the ON/OFF switch to fail
in the closed
mode.
2. Replace
ON/OFF switch. See page 26.
Sprayer circuit breaker opens
after sprayer operates for 5 to
10
minutes.
1. Check
electrical supply with volt meter
. Meter
should
read 105 to 125 V
AC.
1.
If voltage is too high, do not operate
sprayer until corrected.
2. Check tightness of pump packing nut. Over-
tightening tightens packings on rod, restricts
pump
action, and damages packings.
2. Loosen packing nut. Check for leaking
around throat. Replace pump packings, if
necessary.
See page 36.
3. Check maximum working pressure adjust-
ment.
3. Perform
Pressure Control Adjustment. See
page
30.
4. After
determining that there is no
short in sys
-
tem,
reset circuit breaker button.
4. If
circuit
breaker continues to open (button
pops up), replace the circuit breaker. See
page
27.
.
CAUTION
Any short in any part of the
motor power circuit, which is
connected to the output side
of the bridge, will cause the
bridge to burn out immedi-
ately.
Correctly diagnose and
repair
all shorts before
check
-
ing
and replacing bridge.
Building circuit breaker
opens as soon as
sprayer is plugged into
outlet and sprayer is
NOT
turned on.