Nilfisk-Advance 56507009, Troubleshooting Manual

Page: 35 / 82

FORM NO. 56043129 - SR 1900 - 35
SWEEPING SYSTEM
TROUBLESHOOTING GUIDE
Troubleshooting Guide
Symptom
Side broom motor(s) will not run
Part A: Electrical Control Circuit
Note 1: Do all testing with the engine running at high speed, the main broom lowered (sweep
position) and the drive pedal activated (machine moving). When the above steps are
completed the side broom(s) will lower automatically and turn ON (rotate).
Note 2: By pressing the control panel side broom ON/OFF switch during sweeping the side
broom will be raised and turned OFF.
Side broom motor(s) will not
Run
1. Complete the above
operator inputs to turn
on side broom
motor(s)
2. Back probe the S3
side broom solenoid
coil wires (+Vio &
Brn/Blk) should read
12V’s
Check S3 coil wiring
continuity, repair if faulty
Is there 12V’s at the S3 coil ?
Check S3 coil resistance
Spec. 9 Ohms
See hydraulic side broom
motor will not turn
troubleshooting section B
Replace the S3
solenoid coil.
Press & hold side broom on
(Lower) & off (raise) SW.
Check for continuity @ the
ribbon connector (*) for pins
J3-1 & J3-9 on the A2 control
box.
Replace the A2
control box assy.
Do motor(s) runs ?
Ribbon pins test
open replace the
touch pad switch
panel
Yes
No
No
No
* Ribbon connector see Electrical System Figure 1 for detail pin call-outs.
No
Yes
Yes
No
Yes