Advance acoustic 56514925, Service Manual

Page: 48 / 260

Dust Control System 48 Service Manual – Advance 7765 / Nilfisk CR1500
The
Check Valve
allows oil to circulate from the high-pressure side to the low-pressure side of the
Dust Control
Motor
when the
Dust Control Motor
is switched off. This allows the high-speed
Dust Control Motor
to “coast”
down and reduce its speed more gradually when it is shut off.
The
Case Drain
from
Dust Control Motor
goes directly back to reservoir.
Main Broom Motor On and Dust Control Motor Off (with Wet Sweep Bypass Option)
If the machine is equipped with the Wet Sweep Bypass Option, switching the Dust Control Switch to off
while the Main Broom switch is on will run the
Main Broom Motor
but will switch off the
Dust Control Motor
.
In this case, the
Main Broom Solenoid (2)
is energized (blocked). This allows the hydraulic oil to flow from the
Auxiliary Pump,
through the priority flow divider, then to the
Main Broom Motor
. The
Dust Control Solenoid (1)
will be de-energized (open) to allow the oil from the discharge side of the
Main Broom Motor
to bypass the
Dust
Control Motor
and flow to the
Normal Rotation Brush (4)
solenoid valve.
0.34
CIR
4.50
CIR
.75
GPM
Dust
Control
Motor
Main
Broom
Motor
1
2
1.02
CIR
1.24 CIR
Return Block
Reservoir
Auxiliary
Pump
Drive
Pump
9.7 GPM
Main Broom
Solenoid (2)
To Normal
Rotation Brush (4)
To Side
Broom
Valve
Case
Drain
Dust Control
Solenoid (1)
(optional Wet Sweep
Bypass Valve)
To Return
Block
Relief
Valve
2500
PSI
T1