R1600 Load Haul Dump Machine Electrical System Torque Converter Lockup Control Caterpillar


Torque Converter Lockup Control
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The components of the torque converter lockup control circuit are the torque converter lockup switch, the electronic transmission control, the lockup clutch solenoid, the engine speed sensor and the transmission speed sensor.




Illustration 1g00913552

Dash panel

(1) Torque converter lockup switch




Illustration 2g00913553

Cab

(2) Electronic transmission control




Illustration 3g00913556

View of torque converter

(3) Lockup clutch solenoid




Illustration 4g00913557

Rear view of engine

(4) Engine speed sensor




Illustration 5g00913558

View of transmission

(5) Transmission speed sensor

With the key start switch in the ON position, 24 volt is supplied from the batteries via circuit breaker #9 to the electronic transmission control.

With the engine running, engine speed sensor (4) and transmission speed sensor (5) generate a signal that is sent to electronic transmission control (2). The electronic transmission control monitors the engine speed signal and the transmission speed signal. With the two signals the electronic transmission control calculates the torque converter rpm.

The electronic transmission control provides 24 volt power to torque converter lockup switch (1). When the lockup clutch switch is in the ON position a ground circuit to provided for the electronic transmission control.

With the torque converter lockup switch in the ON position, the electronic transmission control supplies 24 volt power to energize lockup clutch solenoid (3). The electronic transmission control applies 24 volt power to the lockup clutch solenoid when the following conditions are met.

  • Torque converter lockup switch is in the ON position.

  • Torque converter rpm is within a preset value.

  • The machine has been operated in the current speed and direction for at least 0.8 seconds.

  • A minimum of 4 seconds has passed since the lockup solenoid was deactivated.

  • Presently selected gear is F2 to F4 or R1 to R4.

The lockup clutch will be disengaged when:

  • Torque converter lockup switch is moved to the OFF position.

  • Torque converter rpm moves out of the preset value.

  • A transmission gear shift is activated.




Illustration 6g01020045

Torque converter lock up control circuit

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