Advance acoustic 56514925, Service Manual

Page: 131 / 260

Hopper System 131 Service Manual – Advance 7765 / Nilfisk CR1500
Troubleshooting
Problem Cause Correction
Hopper not rising
when the hopper lift
lever is moved to
the “raise” position.
The hopper lift cylinder valve
in the hopper control valve
is not operating correctly.
Check the hopper lift cylinder valve and repair/
replace as necessary.
Binding in the hopper mount
or hopper lift cylinder.
Check for any mechanical binding or damage to the
hopper pivot points, hopper lift cylinder and cylinder
mounting points, and correct as necessary.
Hopper dump door
not opening or
closing when the
hopper dump door
lever is moved to
the “open” or “close”
position.
The hopper dump cylinder
valve in the hopper control
valve is not operating
correctly.
Check the hopper dump cylinder valve and repair/
replace as necessary.
Binding in the dump door
mount or dump door
cylinder.
Check for any mechanical binding or damage to
the dump door pivot points, dump door cylinder and
cylinder mounting points, and correct as necessary.
Hopper dump
door not opening
when the hopper
dump door lever is
moved to the “open”
position.
Hopper door pilot check
valve not operating correctly.
Check the hopper door pilot check valve and repair/
replace as necessary.