Nilfisk-Advance Captor 4800 - Scrub Motors; Scrub Brush Motors will Not Operate

FORM NO. 56043093 / Captor
™
4300, 4800, 5400 - 51
SCRUB SYSTEM
TROUBLESHOOTING GUIDE
Possible Symptom
1 Scrub deck motors will not operate
Part A: Electrical Control Circuit
Note: Do all testing with the key switch ON, scrub deck pressure set on (1), foot pedal activated and solution OFF.
Scrub deck motors
will not operate
Do other auto drive
functions work?
See machine drive auto
function do not work section
Press the scrub decrease
switch along with moving the
foot pedal.
Check on the A1 board to see
if the green S7 motor relay
light is on.
Repair or replace defective
coil wiring.
Do the motors operate?
Check for 12 volts at coil
•L7 (+) ORG (-) ORG/BLU
Replace the defective
L7 coil.
Do the motors operate?
Yes
Yes
Yes
No
No
No
Press scrub decrease switch
(-) on the display.
Is its green indicator light on?
Sub. a new A2 display panel.
Do the motors operate?
No
Yes
See Part B hydraulic scrub
deck motors will not operate
troubleshooting section.
Yes
No
Check for coil resistance
L7 at (9 ohm)
No
No
No
No
Replace A1 control board.
Do the motors operate?