Nilfisk-Advance 56507009, Troubleshooting Manual

Page: 42 / 82

42 - FORM NO. 56043129 - SR 1900
HOPPER SYSTEM
TROUBLESHOOTING GUIDE
Troubleshooting Guide
Symptom
Hopper will not raise
Part A: Electrical Control Circuit
Note: Do all testing with the engine running at high speed and the hopper raise (UP) switch
pressed and held.
Hopper will not raise
1. Press & hold hopper
raise switch
2. Back probe the S5
hopper solenoid coil
wires (+Vio & Red/Gry)
should read 12V’s
Check S5 coil wiring
continuity, repair if faulty
Is there 12V’s at the S5 coil ?
Check S5 coil resistance
•Spec. 9 Ohms
See hydraulic hopper raise
troubleshooting section B
Replace the S5
solenoid coil. Does
the hopper raise?
Press & hold hopper raise SW.
Check for continuity @ the
ribbon connector (*) for pins
J3-1 & J3-6 on the A2 control
box.
Replace the A2
control box assy.
Does the hopper
raise?
Ribbon pins test
open replace the
touch pad switch
panel.
No
No
Yes
Yes
No
Yes
Yes
* Ribbon connector see Electrical System Figure 1 for detail pin call-outs.