Ford Escape: Rear Drive Axle/Differential / Description and Operation - Rear Drive Axle and Differential - Overview
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:
General Specifications
Item
Specification
Ball Joint Deflection
Lower
0-0.2 mm (0-0.008 in)
Front Ride Height
AWD Gas vehicles
3.0 mm (0.118 in) ± 12 mm (0.472 in)
AWD
HEV vehicles
2.0 mm (0.078 in) ± 12 mm (0.472 in)
FWD Gas vehicles
5.1 mm (0.200 in) ± 12 mm ..
Special Tool(s) /
General Equipment
Punch
Copper Hammer
Remove the front subframe.
Refer to: Front Subframe (502-00 Uni-Body, Subframe and Mounting System, Removal and Installation).
Drain the PTU.
Refer to: Power Transfer Unit Draining and Filling (308-07D)
.
Remove the intermediate shaft.
Refer to: Intermediate Shaft (205-04 Front Drive Hal..