L322 Range Rover System Description and Operation
AUTOMATIC TRANSMISSION – ZF 5HP24
DESCRIPTION AND OPERATION 44-2-25
The planetary gear train is a single integral assembly which comprises the following components:
l
Three single planet carrier gearsets connected in series
l
A single sun gear
l
A twin sun gear
l
Three ring gears.
Power Flows
Operation of the transmission is controlled by the EAT ECU which electrically activates various solenoids to control
the transmission gear selection. The sequence of solenoid activation is based on programmed information in the ECU
memory and physical transmission operating conditions such as vehicle speed, engine load, throttle position and
selector lever position.
Powerflow Schematic Diagram
1 Torque input from engine
2 Torque converter lock-up clutch
3 Transmission case
4 Planet gearset 1 carrier
5 Planet gearset 2 carrier
6 Input shaft sun gear – large
7 Planet gearset ring gear 1
8 Planet gearset 3 carrier
9 Planet gearset ring gear 3
10 Intermediate shaft sun gear
11 Input shaft sun gear – small
12 Planet gearset ring gear 2
13 Freewheel clutch
Gear
Input
Reaction
Output
Ratio
1st
Planetary gearset 2 and 3 via
input shaft gear
Ring gear 1 and clutch 'F'
Planetary gear 3 carrier
3.57
2nd
Planetary gearset 2 and 3 via
input shaft gear
Planet gear 2 carrier and ring
gear 3
Planetary gear 3 carrier
2.20
3rd
Ring gear 1
Planet gear 1 carrier and ring
gear 2
Planetary gear 3 carrier
1.51
4th
Planetary gearset 2 and 3 via
input shaft gear and planet
gear 2 carrier
Ring gear 3
Planetary gear 3 carrier
1.00
5th
Planetary gearset 2 carrier
Ring gears 1 and 3, Planetary
gear 2 carrier and input shaft
gear
Planetary gearset 3 carrier
0.80
Reverse
Intermediate shaft gear
Ring gear 2, planetary gearset
2 carrier and input shaft gear
Planetary gearset 3 carrier
4.10
M44 1829
2
1
10
A
B
C
D
E
7
8
4
11
5
9
6
12
13
3