Nilfisk-Advance CMAX 28/34ST User Manual

FORM NO. 56043071 CMAX
™
28/34ST / I-MAX
™
28/32C, BA 750/850ST, BA 750C - 37
RECOVERY SYSTEM
SYMPTOM ONE
Vacuum motor will not run (auto mode)
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: Vacuum Motor Control Circuit Troubleshooting Guide
Vacuum motor
will not run (auto
mode)
(See Figure 1).
Replace the K2
vacuum motor
solenoid
Check for 24/36V
at the Pos. K2
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. K2
BLK/YEL 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