Lincoln Nautilus: Rear Drive Axle/Differential / Rear Drive Axle and Differential - Overview. Description and Operation
The RDU is available with 2.58 drive ratio.
Rear Drive Axle and Differential
The rear drive axle and differential unit (RDU ) is a cast aluminum
differential assembly located in the rear of the vehicle consisting of
the following components:
-
Crown wheel and pinion
-
An electrically activated and mechanically engaged
clutch pack acting on the rear drive axles, that applies or removes
torque from the RDU to the rear axles when commanded
When commanded by the AWD the RDU
Clutch synchronizes the drive shaft speed with the rear wheel speed
and allows drive torque from the PTU (Power Transfer Unit) to be fed to
the rear axles.
The RDU system consists of the following components:
-
RDU actuator motor
-
Spur and idler gear
-
Ball ramp drive plate
-
Ball ramp driven plate
-
Drive shaft coupling (Plunge style joint companion flange)
-
Drive shaft speed sensor
-
Rear differential carrier and inner or outer covers
-
Differential case assembly
-
Intermediate shaft (splined to clutch discs)
-
Multi-plate clutch pack
-
Clutch pack housing (splined to clutch plates)
-
Hypoid gears
-
Left and right output seals
System Operation
System Diagram
Item
Description
1
Drive Mode
2
PCM
3
ABS
4
Accelerator Pedal Position
5
BCM
6
Ignition Status
7
GWM
8
AWD
9
Speed / Position sensor
10
Actuator motor
11
Steering Wheel Angle
12
Vehicle Acceleration
13
Wheel Speed
14
RDU
R..
Other information:
Removal
Remove the roof opening panel sliding glass panel.
Refer to: Roof Opening Panel Glass (501-17 Roof Opening Panel, Removal and Installation).
Remove the air deflector.
Refer to: Air Deflector (501-17 Roof Opening Panel, Removal and Installation).
Remove the roof opening panel fixed glass panel.
Refer to: Roof Opening Panel Fixed Glass (501-17 Roof Opening P..
What Is Manual Park Release
Manual park release allows you to move your
transmission out of the park (P) position in
the event of an electrical malfunction or
emergency.
Manual Park Release Precautions
WARNING: When doing this
procedure, you need to take the
transmission out of park (P) which means
your vehicle can roll freely. To avoid
unwanted vehicle movement, always fully
apply the par..