Factory Cat MINI-MAG SERIES, Service Manual

Page: 99 / 121

Mini-Mag Service Manual V1.0
13
13-21
CENTRAL COMMAND CONTROLLER
Use a voltmeter to
test for voltage
across the deltrol
valve terminals
when the green
handle bar button
is depressed
Do you have 24 Volts?
Check the screw
on the back of the
deltrol valve and
make sure it is
backed out all the
way
Check for 24 Volts
into the solution
switch when the
green handle bar
button is depressed
YES
NO
Do you have 24 volts
into the switch?
Check the wiring
between the brush
motor solenoid and
the water switch on the
control panel
NO
Do you have 24 Volts
out of the water switch in
the on position?
YES
YES
NO
Does the scrub deck
turn on when the green
button is depressed?
YES
See “Brush drive system”
section
NO
Was the screw backed
out all the way and
secured with a locknut?
Back out all the way and
install lock nut. Retest
machine
NO
Use your meter to
check for
continuity on the
deltrol valve
Was there
resistance or an
open circuit?
Call the factory
Replace the deltrol valve
Open circuit
Resistance
Replace the switch.
Retest the machine.
YES
Do you have 24
volts on the orange
wire at the deltrol
valve?
Repair wiring from the solution
switch to the deltrol valve.
Retest Machine
NO
Do you have ground
at the coil circuit of the
solution relay?
YES
Call the factory
Repair the wiring from the
negative buss bar.
Retest machine
NO YES
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Previous
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MiniMAG – BRUSH ASSIST
SOLUTION SYSTEM FLOW CHART
2 of 2