Nilfisk-Advance 7765 Service Manual page 45

Service Manual – Advance 7765 / Nilfisk CR1500
Recovery System Hydraulic Diagrams
Squeegee Vacuum Fan Off
When the
Squeegee
is off,
Vacuum Motor
the
Squeegee Fan Motor
is energized.
Solenoid (12)
This allows the hydraulic
oil to flow from the
non-priority leg on the
through
Auxiliary Pump
the
Squeegee Fan Motor
, bypassing the
Solenoid
.
Squeegee Vacuum Motor
The hydraulic oil then
returns to the
Drive Pump
charge circuit.
Squeegee Vacuum Fan On
When the
Squeegee
is on,
Vacuum Motor
the
Squeegee Fan Motor
is de-
Solenoid (12)
energized. This forces the
hydraulic oil to flow from
the non-priority leg on
the to the
Auxiliary Pump
.
Squeegee Vacuum Motor
The hydraulic oil then
returns to the
Drive Pump
charge circuit.
The allows
Case Drain
any oil leaked into the
motor case to drain into
the to prevent it
Reservoir
from building up pressure
and possibly damaging the
motor seals.
The relieves the pressure in the
Check Valve
speed
Squeegee Vacuum Motor
2200
Squeegee
PSI
Fan Motor
Relief
Solenoid (12)
Valve
2200
Squeegee
PSI
Fan Motor
Relief
Solenoid (12)
Valve
Squeegee Vacuum Motor
to "coast" down and reduce its speed more gradually.
Squeegee
Vacuum
0.151
Motor
CIR
Drive
Pump
Reservoir
Squeegee
Vacuum
0.151
Check
Motor
CIR
Valve
Case
Drain
Drive
Pump
Reservoir
when it is shut off and allows the high-
Recovery System
8.2 GPM
Auxiliary
1.02 1.02
1.24 CIR
Pump
CIR CIR
8.2 GPM
Auxiliary
1.02
1.02
1.24 CIR
Pump
CIR
CIR
150