Full-Time 4Wd - Subaru XT 1988 Service Manual

3-1
MANUAL TRANSMISSION AND DIFFERENTIAL
stop at a point where it has turned the cam
@
to a certain
degree (i.e.,
®
position), and the cam
@
is pushed back to
the
®
position by the shaft
®
(i.e., the spring (@).
4) When shift is made to reverse
From the position shown in [Fig. 5-(1)), the arm
(j])
again
moves to the 5th and reverse side. When the shift is made to
reverse, the arm
(j])
moves to the reverse position while push-
ing the shaft
®
and cam
@
together.
Full-Time 4WD
CONSTRUCTION
1) The full-time 4WD transmission is designed on the basis of
the selective 4WD model. A center differential unit and lock-
ing mechanism have been added to the rear end transfer
section. The overall length of the transmission is unchanged.
2) The center differential features the reliable bevel gear
design. It distributes the torque to both front and rear dif-
ferentials and performs the differential action between the
fron~
and rear axle shafts.
3) In order to minimize the size of the transfer section, a
triple-shaft structure with two hollow shafts is adopted. These
are located at the center differential power input section and
at the output section from which power is transmitted to the
front and rear wheels. Major parts such as the transmission
case, main shaft, front differential and others are interchange-
able.
4) The center differential is equipped with a built-in mechan-
ical locking mechanism. It is locked or unlocked by the
vacuum actuator with engine vacuum when the differential
lock switch on the console box inside the cabin is operated.
5) When the center differential is locked, the drive shaft is
coupled directly to the front and rear wheels. This provides a
maximum drive equivalent to that of the 4WD mode of the
selective 4WD model.
The transmission case is unchanged
from that of the former model.
From engine
·C,",'h~
Front reduction gear
Drive pinion
Vacuum actuator
Solenoid valve
Fig_ 7
Main shaft
Ignition switch
.1
.\
Pinion
Center differential
lock selector lever
Hollow shaft
L.....-If\-_ _ _ _
...J
~
Center differential lock switch
Intake manifold
4
L3-494