Nilfisk-Advance CMAX 28/34ST User Manual

26 - FORM NO. 56043071 CMAX
™
28/34ST / I-MAX
™
28/32C, BA 750/850ST, BA 750C
SCRUB BRUSH SYSTEM
SYMPTOM THREE
Scrub Brush Auto Removal Function Does Not Work (Optional)
To test: Have the key switch ON, scrub deck raised and the drive system in neutral. Next to remove the brushes simply depress the control panel
scrub OFF switch (H) for one second.
Part B: Scrub Brush Auto Remove Control Circuit Troubleshooting Guide
Scrub brush auto
removal function
does not work
(See Figure 1).
With the scrub off
button (H) activated,
check for 24/36V
across the K3 brush
remove relay coil.
Wire colors BRN
(pos.) & ORN/BLK
(neg.).
Check for 24/36V at
the neg. K3
ORG/BLK coil wire
to a pos. battery
standoff.
Yes
No
Using an Ohm meter
test resistance, spec.
is 400 ohm for 24V
and 830 ohm for 36V
if infinity coil open.
Yes
Yes
Check continuity of
the ORN/BLK wire,
repair or replace
Test BRN pos relay
coil wire continuity.
Repair or replace
wiring
Open in the coil
winding
Replace the K3
relay
Check for 24/36V at
the control board
(A1) pin #10 battery
ground output to
pos. battery standoff
Replace the A1
control board
No
Check for 24/36V at
the pos. K3 BRN
coil wire to a bat-
tery ground stand-
off.
Yes
No
No
Yes
TROUBLESHOOTING GUIDE (CONTINUED)

Nilfisk-Advance CMAX 28/34ST Specifications

General

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