Nilfisk-Advance SR 1900 Troubleshooting Manual page 43

HOPPER SYSTEM
TROUBLESHOOTING GUIDE
Troubleshooting Guide
Symptom
Hopper will not raise
Part B: Hydraulic Load 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
Is the hopper over
loaded?
Weight Capacity is
1000 Lbs
Yes
Remove the main
broom then empty the
hopper by shoveling
debris out of the dump
door opening. Does
the hopper raise?
Inspect for possible
mechanical binding of:
• Hopper body & machine
frame interference
• Hopper lift linkage &
bushings
No
No
Remove and
disassemble
• L9 hopper
lower valve
cartridge
•Inspect, clean
and reinstall
Repair or
replace
damaged parts.
Does the hopper
raise?
Replace the
defective L5
hopper
cylinder valve
No
cartridge
Does the
hopper raise?
No
Replace the
hydraulic
hopper
cylinder
FORM NO. 56043129 - SR 1900 - 43
No