Technical data
I
TYPE OF PROBLEM
I
WHAT TO CHECK
If check is OK, go to next check When check is not OK refer to this column
I
I
ELECTRICAL SHORT
I
Building circuit breaker opens
as soon as sprayer switch is
turned on.
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 immediate-
ly. 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.
Sprayer circuit breaker opens
after sprayer operates for only
5 to 10 minutes.
1. Check all electrical wiring for damaged in-
1. Repair or replace any damaged wiring or ter-
sulation, and all terminals for loose fit or minals. Securely reconnect all wires.
damage. Be sure to check wires between
pressure control and motor which are encas-
ed in conduit (22). See page 29.
2. Check for missing inspection plate gasket
(see page 221, 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 by using an 3. Replace motor. See page 30.
armature tester (growler) or perform spin
test. See page 19. Inspect windings for
burns.
4. Check bridge 009) by substituting with a
good bridge or by performing bridge test.
See page 20.
4. Replace bridge. See page 24.
CAUTION: Do not perform this check until
armature is determined to be good. A bad
armature will immediately burn out a good
bridge.
1. Check ‘Basic Electrical Problems’ on page 14.
2. Check ON/OFF switch BO3) See page 23.
Be sure the sprayer is unplugged!
Disconnect
wires from switch and check switch with
ohm meter. The ohm meter should read in-
finity with the ON/OFF switch OFF, and zero
with the switch ON.
CAUTION: A short in the motor circuit will
burn the bridge out immediately, which in turn
usually causes the ON/OFF switch to fail in the
closed mode.
1. Check electrical supply with volt meter. 1. If voltage is too high, do not operate sprayer
Meter should read 105 to 125 VAC.
until corrected.
2. Check tightness of pump packing nut. Over-
tightening nut tightens packings on rod,
restricts pump action, and damages
packings. See page 29.
2. Loosen packing nut. Check for leaking
around throat. Replace pump packings, if
necessary. See manual 397-793.
3. Check stall pressure. Remove the elbow (88)
and secondary ball valve KU from the tee
(124) at the pressure control outlet. Install a
5000 psi (350 bar) fluid-filled pressure gauge
in the tee (124). See page 27. Plug in and
turn on sprayer. Slowly increase pressure
setting to maximum. Pump should stall at
2800-3000 psi (196-210 bar). Turn off and
unplug sprayer.
Calibrate pressure control. See page 27.
4. After determining that there is no short in
system, reset circuit breaker button.
4. If circuit breaker continues to open (button
;:;I ;J), replace the circuit breaker. Sea
I
2. Replace ON/OFF switch. See page 23.
I
18
820047