Caterpillar DD9G '1969–74

Caterpillar DD9G, Caterpillar 600-Series Scrapers

Wheel tractor scrapers.

Buster Peterson combined two Cat D9Gs end-to-end to create a single pushloading tractor with twice the power, but for high-volume material handling with a crawler tractor, the issue wasn't so much the horsepower as it was blade capacity. Various experiments were attempted – and failed – in creating a more powerful, higher-capacity dozer by combining two large crawler tractors onto one undercarriage.

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  • Resolution: 1101×1370 @ 300×300 DPI 9.32×11.60cm
  • Filesize: 1.58 MB
  • Added by: Wheels&Tracks , 5 years ago
  • Picture status: Accepted

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5 years ago
Wheels&Tracks

https://ccmodels.com/wp-content/uploads/2017/11/539_002-e1509727468462.jpg

The D9G Track-Type Tractor could also be configured as a DD9G with dual D9 tractors in tandem, as well as a SxS D9G with dual D9 tractors side-by-side. Both of these configurations allowed for simultaneous control of both tractors by one operator through the use of air controls, although the secondary tractor could also be operated separately via mechanical controls. The DD9G excelled where the full power of two tractors was required from the moment of contact, eliminating wait time for positioning a second tractor. This was particularly advantageous when push-loading scrapers with tough material such as shale, clay, limestone, hardpan, cemented gravel, and frozen ground. In volume bulldozing applications, the SxS D9G was equipped with a special 24′ wide U-blade, which could be tilted through separate operation of each tractor’s hydraulic lift cylinders. Realizing 770 flywheel horsepower, the DD9G and SxS D9G were all but unstoppable. Other benefits of utilizing either of these configurations included less traffic in the cut, reduced operator fatigue, and reduced operating costs as only one operator was required for both tractors.

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