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D
E
4
AILY
URO
th
Ready to select 5
/reverse gear
Figure 4
SECTION A-A
1. Gear engagement lever - 2. Gear selection lever -
3. Driver - 4. Gear selection/engagement control rod -
5. Selector - 6. Driver - 7. Rod for 3
engagement fork - 8. Rod for 1
th
- 9. Rod for 5
/reverse gear engagement fork.
Above presetting is implemented by moving selector (2)
clockwise by 7.1º with respect to control vertical axis, that
corresponds to 10º anticlockwise angular displacement of rod
(4).
This device is composed of a plate (8) and a spring (7) housed in the transmission. When passing from the 4
th
A) to the 5
gear position (Figure B), the driver (9), moving in the direction of the arrow, disengages the plate (8), which under the
action of the spring (7) moves onto the driver (9) preventing reverse gear from getting engaged in the opposite manoeuvre.
Print 603.93.651
49374
rd
th
/4
gear
st
nd
/2
gear engagement fork
SAFETY DEVICES
The transmission is equipped with two mechanical safety
devices:
Engagement locking device to prevent more than one gear
getting engaged at the same time.
Reverse gear anti-engagement device when passing from 5
th
to 4
gear.
Engagement locking device
Figure 5
This device is composed of a plate (1), housed in the rear
cover, operated by the gear selection/engagement control rod
(2). When selecting/engaging a gear, the rod (2)
simultaneously turns the plate (1) in which it is inserted. In this
way, the plate (1) will free itself from the slot of the rod
involved in engaging the gear and will lock the other two rods
by inserting itself into their slots.
Reverse gear anti-engagement device
Figure 6
17
5 S 300 TRANSMISSIONS
th
49375
51381
th
gear position (Figure
Base - March 2006
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