differential FORD FIESTA 2007 User Guide

Automatic Transmission/Transaxle -
Vehicles With: 4-Speed Automatic
307-01 -25 Transmission (AW81-40) 307-01 -25
DESCRIPTION AND OPERATION
Item Descriotion
I 1 I From the torque converter I
~l%ansmission input shaft I
1 4 1 Small sun gear I
1 6 1 Planet gear carrier I
1 8 1Short planet gear I
1 9 1 Long planet gear I
10 Annulus and
output wheel of the planetary
/ (gearset
I 11 I Intermediate gear stage I
1 12 1 Differential assembly I
1 13 12nd - 4th gear brake I
1 14 1 2nd gear one-way clutch I
1 15 1 Large sun gear I - --
1 16 14th gear brake I
1 17 1 3rdl4th gear clutch I
~Iianetary gearset, rear I
I B I Planetary gearset, front I
Drive is transmitted from the torque converter (I)
to the transmission input shaft (2) and via the
3rdl4th gear clutch (1 7) to the planet gear carrier
(6).
The large sun gear (15) is held by the 4th gear
brake
(16), the 2nd gear one-way clutch (14) and
the 2nd-4th gear brake
(1 3).
N0TE:The short planet gears (8) and the small
sun gear (4) co-rotate, but they have no influence
on the transmission ratio.
The long planet gears (9) drive the annulus (10) in
the same direction of rotation as the output from
the engine.
The annulus is fixedly connected to the output
wheel of the planetary
gearset and drives the
intermediate gear stage
(11) in the opposite
direction of rotation to the output from the engine.
The intermediate gear stage drives the differential
assembly
(12) in the same direction of rotation as
the output from the engine.
2006.0 Fiesta 1212006 G380528en
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Automatic Transmission/Transaxle -
Vehicles With: 4-Speed Automatic
307-01 -27 Transmission (AW81-40) 307-01 -27
DESCRIPTION AND OPERATION
Item Description
I 1 I From the torque converter I
1 2 I Transmission input shaft I
1 4 ISmaII sun gear I
11 Planet gear carrier I
1 7 1 Reverse gear brake I
1 8 1Short planet gear I
1 9 1 Long planet gear I
10 Annulus and output wheel
of the planetary
I (gearset
I 11 I Intermediate gear stage I
1 12 1 Differential assembly I
1 15 1 Large sun gear I
1 18 1 Reverse gear clutch I
I A I Planetary gearset, rear I
I B I Planetary gearset, front I
Drive is transmitted from the torque converter (1)
to the transmission input shaft
(2) and via the
r reverse gear clutch (1 8) to the large sun gear (1 5).
The planet gear carrier
(6) is held by the reverse
gear brake
(7).
The large sun gear drives the long planet gears
(9) in the opposite direction of rotation to the output
from the engine.
N0TE:The short planet gears (8) and the small
sun gear (4) co-rotate, but they have no influence
on the transmission ratio.
The long planet gears drive the annulus (1
0) in the
opposite direction of rotation to the output from the
engine.
The annulus is fixedly connected to the output
wheel of the planetary
gearset and drives the
intermediate gear stage (I
I ) in the same direction
of rotation as the output from the engine.
The intermediate gear stage drives the differential
assembly (1 2) in the opposite direction of rotation
to the output from the engine.
2006.0 Fiesta 1212006 G380528en
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Automatic TransmissionlTransaxle -
Vehicles With: 4-Speed Automatic
307-01 -37 Transmission
(AW81-40) 307-01 -37
DESCRIPTION AND OPERATION
Sensors
OSS sensor
TSS sensor
The TSS sensor is an inductive pickup.
It measures the transmission input speed via the
outer plate carrier of the
3rdl4th gear clutch and
sends the signal to the transmission control unit.
The transmission control unit uses this signal for:
Torque reduction during gearshifts,
Pressure control during gearshifts,
Shift timing adaptation during upshifts,
Shift timing adaptation during shifts from 3rd to
4th gear,
Shift timing adaptation during shifts from 4th to
3rd gear,
Avoidance of gearshift judder during
engagement of a transmission range,
Torque reduction when pulling away.
Consequences of signal failure:
No TCC,
no torque reduction,
no shift timing adaptation,
no 4th gear. The
OSS sensor is a Hall sensor.
It is mechanically connected via a gear to the input
wheel of the differential assembly.
It measures the vehicle speed via the input wheel
of the differential assembly and sends the signal
to the transmission control unit.
The transmission control unit uses this signal for:
Gearshift control,
Engagement of the TCC,
Torque reduction during gearshifts,
Pressure control during gearshifts,
Shift timing adaptation during upshifts,
Shift timing adaptation during shifts from 3rd to
4th gear,
Shift timing adaptation during shifts from 4th to
3rd gear,
Reverse gear safety strategy,
Avoidance of gearshift judder during
engagement of a transmission range,
Torque reduction when pulling away,
Hill climb mode,
Hill descent mode.
2006.0 Fiesta 1212006 G380530en
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308-0316 Manual Transrnission/Transaxle 308-03-6
DESCRIPTION AND OPERATION
Transmission construction
/"
2006.0 Fiesta 1212006 G281365en
Item Description Item Description
I
2
3
4
6
7
8
9
5th gear housing
Transmission side housing halves
Breather
Hydraulic clutch connection Slave cylinder with integral release
bearing
Input shaft
Output shaft Differential assembly
5 Clutch side housing halves
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308-0318 Manual Transmission/Transaxle 308-03-8
DESCRIPTION AND OPERATION
Output shaft
/'
Item Description
I 1 I Open cylinder roller bearing I
1 2 1 Output shaft with differential drive wheel I
1 3 1lst gear wheel I
1 4 1 1st gear double synchronisation I
151
Synchroniser - I stl2nd gear with reverse
gear
wheel
1 6 12nd gear double synchronisation I
Item Description
1 7 12nd gearwheel I
1 8 13rd gear wheel I
1 9 13rd gear simple synchronisation I
1 10 1 Synchroniser assembly - 3rdl4th gear I
11
12
2006.0 Fiesta 12/2006 G281365en
13 4th gear simple synchronisation
4th gear
wheel
Ball bearing (closed both
sides)
L
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308-03-1 0 Manual Transmission/Transaxle 308-03-1 0
DESCRIPTION AND OPERATION
Differential assembly
Item Description
I 1 1 Bearing I
1 2 1 Crown wheel I
1 3 1 Differential assembly I
4 Sender wheel - Vehicle Speed Sensor
I I (VSS)
The differential assembly is built into the
transmission housing.
The drive torque is transmitted to the differential
by the crown wheel which is bolted to it. The differential
assembly contains differential
pinion gears mounted on a spindle and the axle
halfshaft pinion gears which connect to the front
wheel axle halfshafts through helical gearing.
The axle halfshaft pinion gears can revolve around
the differential pinion gears when the road wheel
speeds are different
(e.g when cornering).
On vehicles without Anti-lock Brake System (ABS)
a VSS detects the speed of the differential
assembly at the VSS sender wheel.
On vehicles with ABS the VSS sender wheel is
also installed. The VSS is however not installed in
this case. A plug with an O-ring closes the
corresponding bore instead.
2006.0 Fiesta la2006 G281365en
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308-03-35 Manual Transmission/Transaxle 308-03-35
DISASSEMBLY
Transaxle(l6 11 8 8)
- Special Tool(s)
I Remover, Drive Pinion Seal I
15074
I I Separator, Oil Pan
Remover,
Differential Bearing
Cone
205-1 76 (1 5-074)
i
Mounting Stand
303-435 (21 -1 87)
Mounting Bracket,
EngineIDifferential
205-329 (1 5-1 05A)
Special Tool(s)
I I Installer, Extension Housing I
I I Remover, Input Shaft Fifth I
General Equipment
I Blanking plugs
1 Drift I
CAUTIONS:
Use vise protectors.
A Use a copper or plastic mallet to prevent
damage.
1. Using the special tools, mount the transaxle
on the mounting stand.
2. Clean any grease and foreign material from
the input shaft.
2006.0 Fiesta 1212006 G23118en
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308-03-39 Manual Transmission/Transaxle 308-03-39
DISASSEMBLY
2. Slide the selector shaft guide sleeve 23. Using a suitable drift remove and discard
downwards. the input shaft oil seal. i
21. Remove the selector shaft guide sleeve. 24. Remove the differential assembly and the
1. Remove and discard the selector shaft guide permanent magnet.
sleeve lower snap ring.
2. Remove the selector shaft guide sleeve.
22.
N0TE:lnstall a rubber band to the second
selector shaft to aid disassembly.
Remove the input shaft, the output shaft and
the selector forks as an assembly. 25.
Remove the reverse gear idler.
26. Remove the selector shaft and the shift
lock.
1. Remove the shift lock.
2006.0 Fiesta 1212006 G23118en
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308-0340 Manual Transmission/Transaxle 308-03-40
DISASSEMBLY
2. Remove the fifth and reverse gear selector
shaft. 29. Using the special tool, remove the
differential bearing cup.
f
27. Remove the output shaft roller bearing.
30. N0TE:lnstall the special tool in the
Remove the rollers and the roller cage from transaxle
housing grooves.
the output shaft roller bearing.
1 Using the special tool, remove the differential I
28m &AUTION:O~I~ use the special tool as
shown, failure to do so may result in the
blanking plug being pressed out of the
housing.
Using the special tool, remove the output
shaft roller bearing outer race.
Remove the oil funnel. bearing
cup.
2006.0 Fiesta 12/2006 G23118en
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308-0348 Manual TransmissionlTransaxle 308-03-48
General Equipment
1 press I
1 Drift I
Materials
Name
S~ecification
1 Transmission Oil I WSD-M2C200-C I
Disassembly
1. Using the special tools, remove the
differential taper roller bearings.
I. Install the special tool.
2. Remove the differential taper roller bearings.
1. Rotate the differential pinions approximately
90 degrees in the differential case and
remove them.
2. Remove and discard the snap ring and using
a suitable drift, drive out the pin.
Remove the two differential pinions and
plastic thrust elements.
3. Remove the ring gear retaining bolts.
2006.0 Fiesta 1212006 G21541 en
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