Power Flow

N POSITION
Hydraulic pressure is not applied to the clutches. Power is not transmitted to the countershaft.

P POSITION
Hydraulic pressure is not applied to the clutches. Power is not transmitted to the countershaft. The countershaft is locked by the parking brake pawl interlocking the parking gear.





1 POSITION
In position, hydraulic pressure is applied to the 1st clutch and the 1st-hold clutch. The power flow when accelerating is as follows;
1. Engine power transmitted from the torque converter drives the mainshaft idler gear, the countershaft idler gear and the secondary shaft idler gear.
2. Hydraulic pressure is applied to the 1st clutch on the secondary shaft, and power is transmitted via the 1st clutch to the countershaft 1st gear.
3. Hydraulic pressure is also applied to the 1st-hold clutch on the countershaft. Power transmitted from the secondary shaft 1st gear is conveyed to the one-way clutch and the 1st-hold clutch. The one-way clutch is used to drive the countershaft via the countershaft 3rd gear, and the 1st-hold clutch drives the countershaft.
4. Power is transmitted to the final drive gear, which in turn drives the final driven gear.





1 POSITION
The power flow when decelerating is as follows;
1. Hydraulic pressure is applied to the 1st clutch and the 1st-hold clutch, and the rolling resistance from the road surface goes through the front wheels to the final drive gear, then to the secondary shaft idler gear.
2. The one-way clutch disengages at this time because the application of torque is reversed.
3. The counterforce conveyed to the secondary shaft idler gear turns the mainshaft idler gear via the countershaft idler gear. As a result, engine braking can be obtained with 1st gear.





2 POSITION
Position is provided to drive 2nd gear only.
1. Hydraulic pressure is applied to the 2nd clutch on the secondary shaft, and power is transmitted via the 2nd clutch to the secondary shaft 2nd gear.
2. Power transmitted from the secondary shaft 2nd gear is conveyed to the countershaft 2nd gear, which drives the countershaft.
3. Power is transmitted to the final drive gear, which in turn drives the final driven gear.

NOTE: Hydraulic pressure is also applied to the 1st clutch, but since the rotation speed of the 2nd gear exceeds that of the 1st gear, power from 1st gear is cut off at the one-way clutch.





D4 OR D3 POSITION, 1ST GEAR
In D4 or D3 position, the optimum gear is automatically selected from 1st, 2nd, 3rd, and 4th gears, according to conditions such as the balance between throttle opening (engine load) and vehicle speed.
1. Hydraulic pressure is applied to the 1st clutch, and power is transmitted via the 1st clutch to the secondary shaft 1st gear.
2. Power transmitted to the secondary shaft 1st gear is conveyed via the countershaft 1st gear to the one-way clutch. The one-way clutch is used to drive the countershaft.
3. Power is transmitted to the final drive gear, which in turn drives the final driven gear.

NOTE: In D4 or D3 position, hydraulic pressure is not applied to the 1st-hold clutch.





D4 OR D3 POSITION, 2ND GEAR
1. Hydraulic pressure is applied to the 2nd clutch, and power is transmitted via the 2nd clutch to the secondary shaft 2nd gear.
2. Power transmitted to the secondary shaft 2nd gear is conveyed to the countershaft 2nd gear, which drives the countershaft.
3. Power is transmitted to the final drive gear, which in turn drives the final driven gear.

NOTE: In D4 or D3 position, 2nd gear, hydraulic pressure is also applied to the 1st clutch, but since the rotation speed of 2nd gear exceeds that of 1st gear, power from 1st gear is cut off at the one-way clutch.





D4 OR D3 POSITION, 3RD GEAR
1. Hydraulic pressure is applied to the 3rd clutch, and power is transmitted via the 3rd clutch to the mainshaft 3rd gear.
2. Power transmitted to the mainshaft 3rd gear is conveyed to the countershaft 3rd gear, which drives the countershaft.
3. Power is transmitted to the final drive gear, which in turn drives the final driven gear.

NOTE: In D4 or D3 HI position, 3rd gear, hydraulic pressure is also applied to the 1st clutch, but since the rotation speed of 3rd gear exceeds that of 1st gear, power from 1st gear is cut off at the one-way clutch.





D4 POSITION, 4TH GEAR
1. Hydraulic pressure is applied to the 4th clutch, and power is transmitted via the 4th clutch to the mainshaft 4th gear.
2. Power transmitted to the mainshaft 4th gear is conveyed to the countershaft 4th gear, which drives the countershaft via the reverse selector hub.
3. Power is transmitted to the final drive gear, which in turn drives the final driven gear.

NOTE: In D4 position, 4th gear, hydraulic pressure is also applied to the 1st clutch, but since the rotation speed of 4th gear exceeds that of 1st gear, power from 1st gear is cut off at the one-way clutch.





R POSITION
1. Hydraulic pressure is switched by the manual valve to the servo valve, which moves the reverse shift fork to the reverse position. The reverse shift fork engages with the reverse selector, reverse selector hub and the countershaft reverse gear.
2. Hydraulic pressure is also applied to the 4th clutch. Power is transmitted from the mainshaft reverse gear via the reverse idler gear to the countershaft reverse gear.
3. The rotation direction of the countershaft reverse gear is changed via the reverse idler gear.
4. Power is transmitted to the final drive gear, which in turn drives the final driven gear.