Subaru XT 1988 Service Manual page 532

3-2
AUTOMATIC TRANSMISSION AND DIFFERENTIAL
(7)
Planetary gear
Front planetary carrier
Rear carrier ASSY
Fig.
27
3-4 Input Shaft
Snap ring
Overrunning
clutch hub
OW.C.
outer race
Rear internal
gear ASSY
thrust washer
L3·607
Two sets of simple planetary gears are used to allow gear
shifting from 1st speed to 4th speed or to reverse. Both the
front and rear planetary gear carriers are made from pressed
steel which is electron-beam welded to other structural
members. The front planetary gear has three pinions while the
rear planetary gear has four pinions. Both are part of an
integral unit, and disassembling is not allowed.
-===...,/
O-ring groove
r_-__ r,--trr_--_-==b= ...
H_i9_h_C_I_ut""fc=;hrd_ru_m _ _
rr-.:::-d:::.= ....
R...,e,a_r_su_n ....... gear
r
fitting surface fitting surface
Turbine hub
fitting surface
Drain circuit for Lubricating circuit
lock-up mechanism
Fig.
28
The input shaft front end is spline-fitted to the torque con-
verter turbine hub. The rear end is spline-fitted to the high
clutch drum and rear sun gear. Power from the torque con-
verter is transmitted to the high clutch drum and rear sun gear.
The input shaft is hollow. A seal is fitted inside the shaft by a
18
L3-608
roll pin. The torque converter side of the shaft becomes the
drain circuit for the lock-up mechanism. The other side
becomes the lubricating circuit for the planetary gears and
high clutch.