Nilfisk-Advance 56507009, Troubleshooting Manual

Page: 45 / 82

FORM NO. 56043129 - SR 1900 - 45
HOPPER SYSTEM
TROUBLESHOOTING GUIDE
Troubleshooting Guide
Symptom
Hopper will not lower
Part B: Hydraulic Load Circuit
Note: Do all testing with the engine running at high speed and the hopper lower (DN) switch
pressed and held.
Hopper will not lower
Repair or replace
damaged parts.
Does the hopper
lower?
Inspect for
possible
mechanical
binding of:
•Hopper linkage
•Hopper Cylinder
Remove and disassemble
• L9 hopper lower valve
cartridge
•Inspect, clean and reinstall
Does the hopper lower?
Replace the
defective L9
hopper cylinder
valve cartridge.
Does the hopper
lower?
Replace the
hydraulic hopper
cylinder
No
No
No
No
Note: The hopper can be lowered with the engine turned off just by pressing and holding the
hopper lower switch.
Support the hopper securely with stands
or an overhead supported lifting strap to
prevent the hopper from lowering when
removing either of the L5 & L9 hopper
system valve cartridges.
WARNING!