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This paper details the design and features of the 651E, 657E, and 657E Push-Pull Wheel Tractor Scraper. Emphasis was placed on the availability, reliability, and serviceability of these units.

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.

The under-utilization of “people” assets is generally commonplace. Through quality improvement efforts, time and money are invested into people, as well as machines. This discussion centers around the concept, techniques and results from quality improvement efforts.