Isuzu N-Series. Service manual - part 808
7B-2 MANUAL TRANSMISSION (MSB)
GENERAL DESCRIPTION
For MSB model transmission, a forward 5-shift all syn-
chromesh type and a backward 1-shift constant mesh
type transmission are employed.
The transmission case is made of a high rigidity cast
iron, and the front cover integral with the clutch housing
is made of aluminum die-cast. An aluminum die-cast
control box containing a gear shift and gear select
mechanism is installed on the right side of the transmis-
sion case. A window for power take-off is also provided
on the left side.
For all the gears, helical gears are employed to
reduce noises.
The synchromesh mechanism that employs balking
rings use block rings of special brass to obtain improved
synchromesh performance.
With the main shaft screwed up at the rear, ball bearings
are employed for the bearings on both sides of the main
shaft and the counter shaft, and needle roller bearings
employed for the bearings at the tip end of the main
shaft and also for those of the 1st gear, 2nd gear, 3rd
gear and reverse gear to secure improved durability and
reduced noises.
Furthermore, with the anti-lash mechanism employed
for the engagement of the top gear with the counter
gear, fine-pitch gears are also employed for the 4th gear
and the 5th gear to reduce noises.
Legend
1. 1st
4. 4th
2. 2nd
5. 5th
3. 3rd
6. Rev.
N7A0035E