Nilfisk-Advance CMAX 28/34ST User Manual

24 - FORM NO. 56043071 CMAX
™
28/34ST / I-MAX
™
28/32C, BA 750/850ST, BA 750C
SCRUB BRUSH SYSTEM
SYMPTOM TWO
Scrub Brush Motors Do Not Work
Note: Do all testing with key switch on, scrub on switch activated (scrub deck lowered) and drive paddle activated (pushed Fwd or pulled into Rev).
Part B: Scrub Brush Motor Control Circuit Troubleshooting Guide
TROUBLESHOOTING GUIDE (CONTINUED)
Scrub brushes
don't turn (See
Figure 1).
Replace the K1
brush motor
solenoid
Check for 24/36V
at the Pos. K1
BRN coil wire to a
battery ground
standoff
Check for 24/36V
(Neg.) at the pin #3
(YEL wire) on the A1
control board. Note:
The drive paddle
must be activated
(Fwd or Rev) for the
speed control to
close the P1 output
circuit to battery
ground.
Test BRN coil wiring
continuity. Repair or
replace the defec-
tive wiring.
Yes
No
Check for 24/36V at
the Neg. K1
VIO/BLK coil wire to
a Pos. battery
standoff
No
No
Yes
Yes
No
Check for 24/36V
Neg. at the YEL P1
pin #1 on the A2
speed control
Replace the A2
speed control
Repair or replace
the P1 controller
YEL (output) wire.
Replace the A1
control board
Yes

Nilfisk-Advance CMAX 28/34ST Specifications

General

Brand	Nilfisk-Advance
Model	CMAX 28/34ST
Category	Floor Machine
Language	English