#
SHIFT INTERLOCK MECHANISM OPERATION [Y16M-D]

BHE051101025T18

## In Neutral Position

1 | Interlock block
2 | Main shift fork shaft
3 | Shift fork shaft No.2
4 | Shift fork shaft No.3
5 | Ball
6 | Section A
7 | Section B
8 | Section C

## In 1st, 2nd, 3rd, and 4th Gear Positions Example: in 3rd gear position

1 | Main shift fork shaft
2 | Interlock block
3 | Reverse shift arm head
4 | 3rd/4th shift fork
5 | 1st/2nd shift fork
6 | 6th shift fork
7 | Section A
8 | Section B
9 | Section C

• When the shift lever is shifted into third gear, the main shift fork shaft moves rightward (see figure) and moves the third/fourth shift fork in the same direction to complete the shift into third gear. At the same time, the first/second shift fork and the reverse shift arm head are held in neutral position by the interlock block in section A, and the sixth shift fork is also held in neutral position by the interlock block in section C. In this way, the unselected shift forks are locked to prevent double engagement.

• In the same way, when shifting into first, second, or fourth gears, the interlock blocks in section A and C restrict the movement of the unselected shift forks to prevent double engagement.

## In 5th Gear Position

1 | Main shift fork Shaft
2 | Interlock block
3 | 5th/reverse shift fork
4 | Reverse shift arm head
5 | 5th shift head
6 | Shift arm
7 | 5th shift head stopper block
8 | Shift fork shaft No.3
9 | Shift fork shaft No.2
10 | Section A
11 | Section B
12 | Section C

• When the shift lever is shifted into fifth gear, the main shift fork shaft moves rightward (see figure), which simultaneously moves the fifth shift head and the fifth shift head stopper block rightward. As the fifth shift head stopper block is fixed to shift fork shaft No.2 by a pin, the shift fork shaft moves when the shift head stopper block moves. Likewise, the reverse shift arm head, which is fixed to shift fork shaft No.2 by a pin, also moves rightward. As a result, the fifth/reverse shift fork moves leftward through the shift arm connected to the reverse shift arm head, thereby shifting the gear into fifth gear. At the same time, the interlock block in section A fixes the shift forks in neutral position except for the fifth shift and reverse shift arm heads. Also, shift fork shaft No.2, which is moved rightward by the fifth shift head, presses onto the ball which is out of the ridge to fix shift fork shaft No.3, thereby preventing double engagement during fifth gear shifting.

## In 6th Gear Position

1 | Main shift fork shaft
2 | Interlock block
3 | 5th shift head
4 | Shift fork shaft No.2
5 | Shift fork shaft No.3
6 | Ball
7 | 6th shift fork
8 | Lever
9 | Section A
10 | Section B
11 | Section C

• When the shift lever is shifted into sixth gear, the main shift fork shaft and the lever in section C move leftward (see figure), which moves the sixth shift fork and shifts the gear into sixth gear. At the same time, the interlock block in section A fixes the shift fork in neutral position except for the fifth shift head. Also, shift fork shaft No.3, which is moved leftward by the sixth shift fork, presses onto the ball which is out of the ridge to fix shift fork shaft No.2, thereby preventing double engagement during sixth gear shifting. Additionally, during sixth gear shifting, the main shift fork shaft also moves the fifth shift head, but as shift fork shaft No.2 is fixed by the ball, the fifth shift head moves leftward on the top of the shaft by itself and is not directly affected by shift operation.

## In Reverse Gear Position

1 | Interlock block
2 | Main shift fork shaft
3 | 5th/reverse shift fork
4 | Reverse shift arm head
5 | Shift arm
6 | Shift fork shaft No.2
7 | Shift fork shaft No.3
8 | Ball
9 | 6th shift fork
10 | Section A
11 | Section B
12 | Section C

• When the shift lever is shifted into reverse gear, the main shift fork shaft moves leftward (see figure), which moves the reverse shift arm head leftward. As a result, the fifth/reverse shift fork moves rightward through the shift arm connected to the reverse shift arm head, thereby shifting the gear into reverse. At the same time, the interlock blocks in sections A and C fix the shift forks in neutral position except for the fifth shift and reverse shift arm heads. Also, shift fork shaft No.2, which is moved leftward by the reverse shift arm head, presses onto the ball which is out of the ridge to fix shift fork shaft No.3, thereby preventing double engagement during reverse shifting.