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This paper describes the concept and design of the Caterpillar “G” series motor grader transmission and transmission controls. Comments on vehicle performance, power train, and oil system requirements are included. Countershaft directional clutches are combined with six or eight speed planetary ranges for this family of articulated motor graders. The pilot-operated hydraulic control provides smooth rapid gear ratio changes and “inching” modulation for the pressure lubed directional clutches.

For some time, Caterpillar Tractor Co. has been marketing a new transmission control system for wheel-tractor scrapers and off-highway trucks. The new system is composed of an electronic microprocessor control box coupled with an individual clutch modulation hydraulic control. This system has resulted in increased vehicle productivity, improved reliability and serviceability, decreased complexity, and increased commonality of parts. This paper describes the concept, design, and test and evaluation process used to develop the new controls before production.