Lockup Clutch Function
The lockup clutch controls the direct drive electrically. When the ECM activates the lockup solenoid the lockup clutch in the torque converter mechanically connects the torque converter input shaft to the torque converter output shaft. This efficiently connects the power train to the engine.
The ECM keeps the lockup clutch engaged as much as possible during normal operation. When the transmission shifts the lockup solenoid is deactivated for easier shifting. The machine is in torque converter drive when the lockup solenoid is deactivated.
The transmission's reverse gear and the transmission's neutral gear are torque converter drive. First gear is torque converter drive on the low end and direct drive on the high end. For the 725, second gear is torque converter drive on the low end, and direct drive on the high end. The other forward transmission gears are direct drive.
Caterpillar Information System:
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