Nilfisk-Advance CS7000 - Page 274

Hopper System 274Service Manual – CS7000
32. Slightly loosen the “DOWN” Hydraulic Hose at
the Upper Cylinder Fitting.
33. Jog the hopper lower button to run the pump
and force the oil out of the “DOWN” Hydraulic
Hose
at the Upper Cylinder Fitting until the oil
runs clear with no foaming or air evident in
the oil.
34. Tighten the “DOWN” Hydraulic Hose on the
Upper Cylinder Fitting.
35. Remove the cap from the Lower Cylinder
Fitting
.
36. Remove the plug from the “UP” Hydraulic Hose
and reconnect the “UP” Hydraulic Hose to the
Lower Cylinder Fitting.
37. Run the hydraulic cylinder ram up and down several times using the hopper raise and hopper lower
buttons to check for correct function.
Note: There is a Velocity Fuse inside the
lower (down) hydraulic cylinder
port that will shut off the ow of
oil through the tting if the oil
ow rate exceeds 1.5 gallons per
minute. This is to prevent the
hopper from dropping down if
the “up” hydraulic hose or lower
cylinder tting fails. If the ram
fails to retract downward, it
could be due to the Velocity Fuse.
Let the hydraulic system sit idle
for a few moments to allow the
Velocity Fuse to reset, then try
retracting the ram again.
Upper Cylinder
Fitting
“DOWN”
Hydraulic
Hose
“UP”
Hydraulic
Hose
Lower
Cylinder
Fitting
Velocity Fuse
(inside lower
cylinder tting)