Power Flow

Power Flow

Gear Operation

Gears on the mainshaft
^ 1st gear engages/disengages with the mainshaft by the 1st clutch.
^ 2nd gear engages/disengages with the mainshaft by the 2nd clutch.
^ 3rd gear is integral with the mainshaft.
^ 4th gear engages/disengages with the mainshaft by the 4th clutch.
^ The reverse gear engages disengages with the mainshaft by the 4th clutch.

Gears on the countershaft
^ The park gear, 1st gear, 2nd gear, 4th gear are splined with the countershaft and rotate with the countershaft.
^ 3rd gear engages/disengages with the countershaft by the 3rd clutch.
^ final drive gear is integral with the countershaft.
^ 4th gear and reverse gear rotate freely from the countershaft. The reverse selector engages the 4th gear or the reverse gear with the reverse selector hub. The reverse selector hub is splined with the countershaft so that the 4th gear or reverse gear engage with 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 park pawl interlocking the park gear.

N Position





Engine power transmitted from the torque converter drives the mainshaft, but hydraulic pressure is not applied to the clutches. Power is not transmitted to the countershaft. The countershaft 4th gear is engaged to the reverse selector hub by the reverse selector shift fork when the shift lever is shifted to the N position from any of the forward position.
The countershaft reverse gear is engaged when shifted from the R position.
In the D or D3 position, the optimum gear is automatically selected from the 1st, 2nd, 3rd, and 4th gears, according to conditions such as the balance between the throttle opening (engine loading) and vehicle speed.

D or D3 Position in 1st gear





^ Hydraulic pressure is applied to the 1st clutch, then the 1st clutch engages the mainshaft 1st gear with the mainshaft.
^ The mainshaft 1st gear drives the countershaft 1st gear and the countershaft.
^ Power is transmitted to the final drive gear, which in turn drives the final driven gear.

D or D3 Position in 2nd gear and the 2 Position





^ Hydraulic pressure is applied to the 2nd clutch, then the 2nd clutch engages the mainshaft 2nd gear with the mainshaft.
^ The mainshaft 2nd gear drives the countershaft 2nd gear and the countershaft.
^ Power is transmitted to the final drive gear, which in turn drives the final driven gear.

NOTE: Hydraulic pressure is 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.

D or D3 Position in 3rd gear





^ Hydraulic pressure is applied to the 3rd clutch, then the 3rd clutch engages the countershaft 3rd gear with the mainshaft.
^ The mainshaft 3rd gear drives the countershaft 3rd gear and the countershaft.
^ Power is transmitted to the final drive gear, which in turn drives the final driven gear.

NOTE: Hydraulic pressure is 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.

D Position in 4th gear





^ Hydraulic pressure is applied to the servo valve to engage the reverse selector with the countershaft 4th gear while the shift lever is in the forward range (D, D3 and 2 positions).
^ Hydraulic pressure is also applied to the 4th clutch, then the 4th clutch engages the mainshaft 4th gear with the mainshaft.
^ The mainshaft 4th gear drives the countershaft 4th gear, which drives the reverse selector hub and the countershaft.
^ Power is transmitted to the final drive gear, which in turn drives the final driven gear.

NOTE: Hydraulic pressure is 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





^ Hydraulic pressure is applied to the servo valve to engage the reverse selector with the countershaft reverse gear while the shift lever is in the R position.
^ Hydraulic pressure is also applied to the 4th clutch, then the 4th clutch engages the mainshaft reverse gear with the mainshaft.
^ The mainshaft reverse gear drives the countershaft reverse gear via the reverse idler gear.
The countershaft reverse gear drives the reverse selector, reverse selector hub and the countershaft.
^ The rotation direction of the countershaft reverse gear is changed via the reverse idler gear.
^ Power is transmitted to the final drive gear, which in turn drives the final driven gear.