Driving shaft’s end toward the clutch is held by the ball bearing located in
flywheel, another end fitted with input gear is held in transmission case by the ball
bearing and its middle portion is held in the bearing retainer which is fixed in
transmission case with the slide lead screw. When the replacement of the friction piece
is required, the driving shaft along with the bearing retainer is moved axially through
turning the slide lead screw until the shaft end toward the clutch returns inside the
transmission case.
3.2.2 Output shaft
The cluster gear is installed on the output shaft through two needle bearings and
a spacer. Also the output gear is splined to the output shaft through a spacer. The
output shaft is held in the transmission case with two tapered roller bearings and
several shims are used to adjust the backlash between the output gear and the bearing.
The bigger gear of the cluster gear normally meshes with the input gear and high
speed gear while the smaller gear with the low speed gear. The output gear normally
meshes with the forward gear or reverse idler gear.
3.2.3 Main shaft
The high and low speed reverse and forward gears are all installed on the main
shaft through needle bearings. As they normally mesh with the cluster gear, idler gear
and input gear respectively, it’s easy to shift for changing speed or direction
synchronizer by operating the synchromesh mechanism.
3.2.4 Idler shaft
Both ends of the idler shaft are supported by the transmission case and its rear
end is positioned by a steel ball. The idler gear is installed on the idler shaft through
needle bearings and normally meshes with the reverse gear and output gear.
3.2.5 Rotating rod and shift forks (See Fig.3-1 and Fig.3-2)
Two rotating rods are used for performing the changeover in travel speed and
direction respectively. The shift forks are supported on the shift rods. The ball is
designed to rest in the notch of the shift rod to secure gearshifting position.
-18-
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