992G Wheel Loader and 854G Wheel Dozer Power Train General Information Caterpillar


General Information
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Illustration 1g00118080

Location of Power Train Components

(1) Diesel engine. (2) Torque converter (impeller clutch). (3) Upper drive shaft. (4) Input transfer gears. (5) Transmission. (6) Drive shaft. (7) Drive shaft. (8) Rear final drives. (9) Planetary gears for final drives. (10) Rear drive pinion. (11) Drive shaft. (12) Output transfer gears. (13) Bearing cage. (14) Front drive pinion. (15) Front final drives.

Power from diesel engine (1) is sent from the flywheel to torque converter (2). The torque converter (impeller clutch) has a lockup clutch (if equipped). The lockup clutch provides direct drive capability. Inside the torque converter, an impeller is fastened to the hub of a hydraulically activated clutch. The impeller clutch allows a controlled reduction in the torque transmitting capacity of the converter. This places a limit on the amount of torque converter output.

Note: The lockup clutch is standard on the 854G Wheel Dozer. The lockup clutch is not standard on the 992G Wheel Loader.

The power train electronic control module (ECM) and the reduced rimpull selection switch control the impeller clutch. The left service brake pedal is also used to vary the amount of torque converter capacity in order to control the wheel slip. The left service brake pedal also varies the amount of torque converter capacity in order to increase the hydraulic system response.

Note: The 854G Wheel Dozer is not equipped with reduced rimpull.

The lockup clutch is controlled by a switch on the right side console on the 992G Wheel Loader. When the lockup clutch is enabled by the switch, the power train ECM determines when the lockup clutch is engaged.

The 854G Wheel Dozer power train ECM determines when the lockup clutch engages. The 854G Wheel Dozer is not equipped with a switch to enable the lockup clutch.

Power from the output shaft of the torque converter is sent through drive shaft (3) to input transfer gears (4). The output gear of the transfer gears turns the input shaft of the transmission (5) .

Five clutches in the transmission, which are activated hydraulically, provide three forward speeds and three reverse speeds. Speed and direction are selected by using the STIC Steering and Transmission Control.

The transmission output shaft sends power through the idler gears in transfer gears (12) to the output gear of the transfer gears. The output gear sends power through drive shaft (11) to rear drive pinion (10). The output gear also sends power to front drive pinion (14) through drive shaft (6) and drive shaft (7) and through bearing cage (13) .

Each pinion, bevel gear, and differential gear has a specific axle. Each gear turns a specific axle. The axles are connected to final drives (8) and (15). The final drives turn the wheels.

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