Jaguar XJ (X350). Service manual — part 1040
1 planetary gear carrier
1 ring gear
Double Planetary Gearset
Item
Part Number
Description
1
Planetary gear spider brake D
2
Planetary gears (short)
3
Ring gear 2
4
Output
5
Double planetary gears (long)
6
Planetary gear spider clutch E
7
Sunwheel 3 clutch B
8
Sunwheel 2 clutch A
Apply Components
Shift Elements
The other shift elements in addition to the torque converter lock-up clutch are:
three rotating multi-plate clutches A, B and E.
two fixed multi-disc brakes C and D.
All gear shifts from 1st to 6th or from 6th to 1st are power-on overlapping shifts, that is to say during
the shift one of the clutches must continue to transmit the drive at lower main pressure until the
other clutch is able to accept the input torque.
The shift elements, clutches or brakes are engaged hydraulically. The transmission fluid pressure is
built up between the cylinder and the piston, this presses the clutch plates together.
When the transmission fluid pressure drops, the cup spring pressing against the piston moves it back
to its original position.
The purpose of these shift elements is to perform in-load shifts with no interruption to traction.
Multi-plate clutches A, B and E supply power from the engine to the planetary gear train; multi-disc
brakes C and D bear against the transmission housing in order to achieve a torque reaction effect.
Shift Elements
Item
Part Number
Description
1
Multi-plate clutch B
2
Clutch cylinder B, outer plate carrier
3
Multi-disc brake C
4
Brake cylinder C, outer plate carrier
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5
Shaft key
6
Brake cylinder C, outer plate carrier
7
Transmission housing
Multi Plate Clutch
Clutch E is equalized in terms of dynamic pressure, that is to say its piston is exposed to the
transmission fluid flow on both sides, in order to prevent pressure build up in the clutch as the speed
increases. This equalization process is achieved by a baffle plate and pressure-free transmission fluid
supply by a lubricating passage, through which the space between piston and baffle plate is filled
with transmission fluid.
The advantages of this dynamic pressure equalization are:
reliable clutch engagement and release in all speed ranges.
improved shift refinement.
Multi Plate Clutch
Item
Part Number
Description
1
Lubricating transmission fluid passage
2
Turbine shaft
3
Main pressure supply to clutch E
4
Ring gear
5
Cylinder E
6
Piston E
7
Cup spring
8
Clutch plate cluster
9
Baffle plate
10
Space for dynamic pressure equalization
11
Inner plate carrier E
Shift overlap control
When overlap gearshift takes place, freewheels (one-way clutches) are not used but are replaced by
suitable actuation of the relevant clutches. This both enables weight and space to be saved.
The electronic-hydraulic shift action is obtained by means of various valves in the transmission
control module (TCM) and main control valve body, actuated by pressure regulators. They engage or
disengage the relevant clutches or brakes at the correct moments.
Output is always by the ring gear of the second, downstream planetary gear set.
Hydraulic System
Fluid Pump
The fluid pump is of a "half-moon" pattern and delivers approximately 16 square cm of transmission
fluid per revolution.
It is located between the torque converter and the transmission housing.
The torque converter is supported in the fluid pump by a needle roller bearing. The fluid pump is
driven directly from the engine by the torque converter shell and supplies transmission fluid to the
transmission and the hydraulic control unit.
The fluid pump draws in transmission fluid through a filter and delivers it at high pressure to the
main pressure valve in TCM and main control valve body unit. This valve adjusts the pressure and
returns excess transmission fluid to the fluid pan.
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