Nilfisk-Advance 56507009, Troubleshooting Manual

Page: 47 / 82

FORM NO. 56043129 - SR 1900 - 47
HOPPER SYSTEM
TROUBLESHOOTING GUIDE
Troubleshooting Guide
Symptom
Hopper dump door will not close
Part A: Electrical Control Circuit
Note: Do all testing with the engine running at high speed and the hopper dump door close
switch pressed and held.
Hopper dump door will not
close
1. Press & hold hopper
dump door close
switch
2. Back probe the S7
dump door solenoid
coil wires (+Vio &
Blk/Wht) should read
12V’s
Check S7 coil wiring
continuity, repair if faulty
Is there 12V’s at the S7 coil?
Check S7 coil resistance
Spec. 9 Ohms
See hydraulic hopper raise
troubleshooting section B
Replace the S7
solenoid coil. Does
the dump door
close?
Press & hold hopper door open
SW. Check for continuity @ the
(*) ribbon connector for pins J3-1
& J3-7 on the A2 control box.
Replace the A2
control box assy.
Ribbon pins test
open replace the
touch pad switch
panel
* Ribbon connector see Electrical System Figure 1 for detail pin call-outs.
Yes
Yes
No
Yes
No
No
Yes
No
No