Factory Cat MINI-MAG SERIES Service Manual page 119

WATER
POTENTIOMETER does
not change water delivery.
Replace the valve YES
Disconnect the center terminal of the solution potentiometer. With a
voltmeter set to the DC scale measure the the voltage from the
negative battery terminal to the center terminal of the potentiometer.
Turn the petitioner from minimum flow to maximum flow slowly and
watch your meter. The voltage should sweep smoothly from 0 volts to
Mini-Mag Service Manual V1.0
MiniMAG – TRACTION DRIVE w/CCII
SOLUTION POTENTIOMETER DIAGNOSIS
Operate machine
and verify the
customers
complaint.
FROM
PAGE 3
"C"
While scrubbing, turn the
potentiometer very slowly and
observe the icon water icon on
the LCD display.
Does the
length of time the icon
stays on increase or
decrease at all?
NO
Turn the solution
potentiometer to
the Maximum flow
position.
Does the
water icon on the
LCD display stay on
continuously?
5 volts.
GO TO
PAGE 2
"A"
CENTRAL COMMAND CONTROLLER
1 of 3
Can you change
water volume with the
Potentiometer?
Does
the machine
TOO
dispense too much
MUCH
or too little
water?
Fill at least 1/3 full and
re-test machine.
Instruct owner on
YES proper machine
operation
Check to make
TOO sure the solution
LITTLE tank is at least 1/3
of the way full.
Was the tank at
NO
least 1/3 full?
YES
Disconnect the
supply hose going
to the Deltrol
valve.
GO TO
PAGE 3
"B"
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