Subaru XT 1988 Service Manual page 573

AUTOMATIC TRANSMISSION AND DIFFERENTIAL 3-2
3) 4WD TRANSFER UNIT
The transfer unit consists of a hydraulic multi-plate clutch and
a transfer hydraulic control system incorporating a duty
solenoid valve. It is housed in the extension case together
with the bearings, rear drive shaft, etc.
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Fig. 84
59
(1) Transfer Clutch (Multi-plate clutch)
The transmission control unit has duty ratios memorized in
advance according to running conditions. In order to obtain
the optimum transfer torque for the running condition, the
oil pressure that is applied to the drive plates and driven plates
is controlled by applying oil pressure to the transfer piston
from the transfer oil pressure control device including the
duty solenoid.
Also, the transfer clutch drum and rear drive shaft are joined
to each other by welding. The rear drive shaft has drilled oil
passages for transfer clutch control and also for lubrication of
extension bushing and ball bearing in it.
1 Snap ring
2 Pressure plate
3
Drive plate
4 Driven plate
-1 5 Thrust need Ie beari ng
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6 Snap ring
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7
Spring retainer CPo
8 Lathe cut seal ring
9 Transfer clutch piston
10
Lathe cut seal ring
11 Needle bearing
12 Rear drive shaft
13 Ball'bearing
14 Seal ring
15 Reduction drive gear
L3-661