30
Troubleshooting (cont.)
Checking Individual Components (cont.)
TRAK-STAR ULTRASONIC SPEED SENSOR
Make sure the Trak-Star is emitting a “crackling sound”. If
not, check the power at pins A (white wire) and B (blue wire)
of the adapter cable six-pin connector. Make sure the blue
wire is securely connected to a good ground frame.
If the ground surface on which you are traveling is too
smooth (some blacktop and concrete, especially wet or
Ice, etc), the speed reading may be zero, erratic or slow to
respond. If the Trak-Star is making sound and the ground is
not too Smooth, try mounting the Trak-Star pointing forward
and as far to the front of the vehicle as possible. (Echo
interference problem. See Trak-Star Installation/Operator’s
Manual for more information).
MAGNETIC SENSOR
Magnetic sensors may be checked with an ohmmeter or
continuity tester. (CAUTION: Maximum current is .200
amps, exceeding this limit could damage the sensor).
Connect the test probes to the two outside pins of the
magnetic sensor’s three-pin connector. With no magnet near
the sensor, there should be no continuity - infinite resistance.
With a magnet near the sensor, there should be continuity
- near zero ohms resistance. With one probe touching the
threaded case of the sensor and the other probe touching
one pin at a time, there should be no continuity.
MAGNET INSTALLATION
Disconnect speed sensor (yellow cable tie near connector)
from main harness. Connect an ohmmeter or continuity
tester to the two pins of the sensor cable connector and
slowly rotate the wheel. (CAUTION: Maximum current is
.200 amps, exceeding this limit could damage the sensor).
When a magnet comes near the sensor the sensor should
close (continuity or 0 ohms). As the magnet goes away, the
sensor should open (no continuity or infinite resistance).
REMOTE RUN/HOLD SWITCH
Connect an ohmmeter or continuity tester to the leads of the
Remote Run/Hold Switch or sensor). With the Remote Switch
in the hold position, there should be no continuity - infinite
resistance. With the Remote Switch in the run position ,
there should be continuity - near 0 ohms.
JUMPER COVER
Connect an ohmmeter to the pins of the dust cover with
jumper wire. There should be continuity - near 0 ohms.
CIRCUIT BREAKER
The console’s internal circuit breaker will trip when the
combined current of all three boom solenoid wires and the
boost solenoid wire reach approximately 20 amps. When
the circuit breaker trips, power is removed from the boom
and boost wires and area will not count. To reset the circuit
breaker, turn the monitor off for 10 seconds or more,. If the
breaker continues to trip, check your wiring.
SOLENOID VALVES
Following the manufacturer’s recommended troubleshooting
procedures.
SERVO CONTROL SIGNAL
Put master switch in MANUAL, Remote Run/Hold in RUN
and Boom Switches ON. Using a voltmeter or test light,
check from a good frame ground to each servo wire. You
should get about 6 volts (dim light). Holding the “+”
switch should cause the red wire to pulse towards 8 volts
(light pulses dimmer). Holding the “-” switch should show
opposite results. If the servo control signal checks OK but
a known working servo valve will not run or takes longer
than 20 seconds to go from one end to the other, check for
low voltage or poor connections on the small orange power
wire.
SERVO VALVES
The best way to test a servo is with the console. With the
master switch in MANUAL, Remote Run/Hold in RUN and
Boom Switches ON. Holding the “+” switch should close the
servo and the “-” switch should open the servo (provided the
console passes the Servo Control Signal test). You may also
use a nine volt transistor battery. Connecting the battery
to the servo should cause the servo to run. Reversing the
battery connections should run the servo the other direction.
The servo should run smoothly from one end to the other.
FLOWMETER
Shaking the flowmeter end to end should produce a “rattling”
sound (shaft end play). Blowing in meter from either end
should spin turbine freely. If the turbine spins freely but the
meter will not register flow with a known working sensor,
the turbine may be incorrectly installer or have damaged
magnets. See page 34 for details on inspection and cleaning.
PLUMBING
Plumbing is a very important factor in the proper performance
of the MT-3000 system. The following chart will help you
determine what area of the plumbing may be causing your
problem. It is assumed that your plumbing functionally
matches the system diagram layout. Be certain that the servo
valve and flowmeter are functioning properly. Also, make
sure you have the correct tips for the speed and intended
spray rate. And don’t forget the obvious such as leaks, kinked
hoses and plugged or worn tips. If you need more detail
than the chart provides, read the Pluming Guidelines section
starting on page 33.
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