Page 461
DISASSEMBLY, ASSEMBLY, ADJUSTMENT
Automatic transmission
Concerning removal and installation of power plant, see
page 442—1.
Disassembling the transmission
, 1. Drain oil.
| Invert gearbox and remove front and rear bottom
é covers.
, 3. Remove front cover.
4 4. Undo retaining screw and nut for sprocket wheels,
using tool 879023 to lock.
¥
$2633
UNDOING THE SCREW FOR PRIMARY GEAR
Support 879023
5. Remove the wheels.
REMOVING THE PRIMARY GEAR
Jan, 1973
NOTE
Gear unit axial clearance must be checked before
each disassembly.
6.
7.
Remove cover on right-hand side.
Disconnect throttle valve control cable.
Remove all oil pipes inside the front bottom cover.
The three pipes inside the rear bottom cover is to
be removed later.
Undo the three retaining screws from the valve hous-
ing, lift the housing straight up and remove the two
large oil pipes from the pump.
472-1
Page 462
LOCATION OF OIL PIPES
REMOVING THE RETAINING SCREWS OF THE VALVE
HOUSING
Jan. 1973
472-2
Page 463
— = a ee
OIL PIPE BETWEEN VALVE HOUSING AND OIL PUMP
10. Turn gearbox right way up, undo the three oil pump
retaining screws, and remove the pump. Lift the
torque converter at the same time to make the work
easier.
11. Lift out the torque converter.
12. If necessary, disconnect throttle cable.
REMOVING TORQUE CONVERTER HOUSING
15. Remove gasket.
16. Undo automatic adjustment screw, see illustration.
17. Remove front band lever shaft.
REMOVING THROTTLE CABLE FROM TRANSMISSION
CASING
13. Remove retaining screws from torque converter
housing (five outside and five inside).
14. Before lifting out the housing, pull the gear selector
rod as far forward as possible. Remove the three
remaining oil pipes and at the same time remove
the converter housing.
REMOVING FRONT BAND LEVER SHAFT
Jan. 1973 SAEs 472-3
Page 464
18. Unhook rear band spring.
REMOVING THE SPRING
19. Remove rear band lever shaft, removing the spring
at the same time.
| $ 2641
REMOVING REAR BAND LEVER SHAFT
20.
21.
Undo the three screws securing the centre support.
Note that the screw in the engine oil sump is pro-
vided with a rubber gasket.
a
SCREW FOR CENTRE SUPPORT
Remove the front clutch. Take care of the axial
washer (washers). There are two different designs,
the one washer of the later design is thicker and
supersedes the two washers on the earlier design
as spare part.
REMOVING THE FRONT CLUTCH
22:
Remove the rear clutch with the shaft for the for-
ward sun gear, holding the front band securely to
prevent it from falling over.
472-4 SAAB
Dec, 1975
Page 465
on
23. Remove front band.
REMOVING THE FRONT BAND
24. Remove centre support, holding the planet carrier
in place by compressing the rear band.
REMOVING THE CENTRE SUPPORT
Dec. 1975
25. Remove the planet carrier, save the thrust washer
and bearing.
26. Remove rear band.
27. Remove the ring gear (valid only for earlier design).
On automatic transmissions of later design the ring
gear is removed together with the pinion bearing
housing.
REMOVING THE FRONT PISTON
28. Dismantle lock ring trom front piston and remove
the piston with aid of compressed air.
29. Remove the rear piston with aid of compressed air.
REMOVING THE REAR PISTON
SAAB 472-5
Page 466
30. If necessary dismantle the parking pawl shaft and 31. If necessary, take off bearing houses and remove
remove the parking pawl and spring. differential and pinion shaft as stated below.
Remove the inner universal joints using puller
839147 and tapping hammer 839027. Remove the
cover from the differential housing.
Remove the differential assembly by unscrewing
the differential bearing seats on both sides and re-
moving them with the help of puller 839147 and
tapping hammer 839027. Take out the differential
assembly with shims (if any). Safe the spacer wash-
ers and shims; the latter must be replaced in their
original positions on reassembly unless the differen-
tial gear backlash has been altered by the exchange
of some component. Instructions for disassembling
the differential are given in section 473.
REMOVING PARKING PAWL SHAFT
REMOVING DIFFERENTIAL BEARING SEATS
Puller 839147, tapping hammer 839027 \
PARKING PAWL ~
NOTE
If overheating or the like has occurred, the differen-
tial and pinion must be disassembled for inspection
of the front pinion bearing, which is lubricated by
oil from the automatic transmission.
472-6 SANE Dec. 1975
Page 467
32. The pinion and its bearing housing are removed as
follows:
Undo the four screws securing the pinion bearing
housing and free the housing by tapping gently,
using a wooden drift to avoid damaging the sur-
faces.
REMOVAL OF PINION BEARING , LATER DESIGN
33. Place the ring gear and the pinion bearing housing
in a press and use the press to separate the splines
of the ring gear hub and the pinion. The press drift
and its retainer 879061 are introduced through
the hole in the ring gear hub so as to make contact
with the pinion. See illustration.
Jan. 1973
SEPARATION OF RING GEAR AND PINION UNDER
PRESSURE
Drift 879061
Assembly of transmission
1.
Automatic transmission of later design:
The following procedure should be used when
Pressing the ring gear hub and the pinion together.
Lubricate the seal rings with automatic transmis-
sion oil and ensure that they move freely in their
grooves. Slacken the two screws holding the seal
housing and hold the housing away from the seal
rings, while pressing the ring gear and the pinion
together to avoid damageing the seal rings,
Screw the seal housing to the pinion bearing hous-
ing using the two screws.
Fit the O-ring on the pinion housing.
Screw in the locating studs 879022 and put on the
necessary number of shims. Locate the pinion hous-
ing and tighten the screws to the correct torque.
If the parking pawl previously has been removed,
fit parking pawl and spring and put in the shaft so
that the spring will be locked in the shaft groove.
Invert the transmission casing so that the underside
is uppermost.
Automatic transmission of earlier design: Check
that the seal rings on the ring gear turn freely in
their grooves. Lubricate the ring gear with automa-
tic transmission oil and refit it. Fit the rear brake
band.
Place the shims, thrust bearing and thrust needle
bearing on the planet gear carrier. Grease the small
thrust bearing washer and the sun wheel rear thrust
needle bearing with vaseline and attach them to
the inside of the planet gear carrier. NOTE! The
flange on the small thrust bearing washer must
point inwards towards the planet gear carrier.
472-7
Page 468
PLANET GEAR CARRIER WITH SHIMS AND THRUST
NEEDLE BEARING
1, Planet gear
2. Shims
3. Thrust bearing washer
4. Thrust bearing
8. Fit the planet gear carrier and centre support.
FITTING THE CENTRE SUPPORT
Fit the front brake band.
FITTING THE FRONT BAND
10.
Place the thrust needle bearing between the two
sun wheels on the rear sun wheel shaft. Check
that the seal rings are intact and move freely in
their grooves. Lubricate with automatic transmis-
sion oil. Carefully insert the shaft through the rear
clutch, taking care not to damage the seal rings. )
Dec. 1975
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Page 469
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472-9
Jan. 1973
Page 470
11. Locate the steel washer (with the two flat sides in 14. Place the long pressure rod against the rear band,
the hole) on the rear clutch hub. Mount the bronze place the lever in position and insert the shaft from
washer and the front clutch. side, at the same time holding the spring in place so
On later versions of the automatic transmission, that the shaft engages. NOTE: One end of the spring
the two axial washers are replaced by a single must lie against the lever throughout to avoid scratch-
thicker washer with bearing metal on one side. ing the cylinder.
The bearing metal side faces the front clutch. 15. Place the short pressure rod against the front band,
place the lever in position, and place the automatic
adjustment carrier against the front band. Insert the
shaft from the side through the carrier and lever si-
$2653
REAR CLUTCH HUB WITH WASHERS
FITTING SHAFT AND SPRING FOR LEVER REAR BAND
multaneously. Adjust the spring on the adjusting
screw so that it lies 1.5—2 thread flights from the
lever (see chapter on Adjustment).
16. Place the gasket for the torque converter housing
in position. Mount the housing while simultaneously
fitting the contact washer onto the input shaft and
the three pipes inside the rear bottom cover. See
page 472—13.
The washer must be located between the bearing
and the step on the input shaft. Tighten the screws
to the specified torque. Fit the lower sprocket so
as to true up the shaft radially.
3 . NOTE
- = ; Do not tighten the sprocket wheel before checking
LOCATION OF THE WASHER ON REAR CLUTCH HUB the play in the gear train.
12. Insert the complete clutch assembly (front and rear
clutch) and fit the end plate. Check that the O-ring
is in place and intact. Check also the small O-ring
on the hub of the end plate.
13. Clean, inspect and if necessary exchange pistons
and piston seals. Lubricate the servo pistons and
| insert in the servo cylinders.
472-10 SAAB Jan. 1973