Caterpillar Dual D-9's Pushing Scrapers
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Caterpillar Dual D-9's Pushing Scrapers
i have seen photos of the twin d9 but never one working check it out at this link http://www.youtube.com/watch?v=9gAYeyUB7oA
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Re: Caterpillar Dual D-9's Pushing Scrapers
Two, but not dual, D9s pushing a Blackwell 657 in about 1966.
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Re: Caterpillar Dual D-9's Pushing Scrapers
i think we are both wrong they where called Caterpillar Quad-Track D9G check this link out http://www.pbase.com/onetrack/caterpillar_technical
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Re: Caterpillar Dual D-9's Pushing Scrapers
Think that they were known as Dual D9s during the Petersen prototype stage and were re named the DD9 when Cat bought the rights and made them as a factory option but were often refereed to as Quadtrack. I have a Cat spec sheet headed Caterpillar DD9H (Dual D9H)with no mention of Quadtrack anywhere!
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Re: Caterpillar Dual D-9's Pushing Scrapers
The Peterson version was called the Peterson Quad-trac D9G. The Caterpillar version was called the D9G. They were quite the machine to work with. I never ran them but a company I worked for in the mid 80s still had two sets of them. I quit working there in 1993 & they still had them but they had split up both sets & made single push cats out of them.
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Re: Caterpillar Dual D-9's Pushing Scrapers
How do you think they steered? Looks like the front unit steers normally and the rear follows the line - just wondering if the rear steers too or if just directed by the front?
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Re: Caterpillar Dual D-9's Pushing Scrapers
Dah wrote:How do you think they steered? Looks like the front unit steers normally and the rear follows the line - just wondering if the rear steers too or if just directed by the front?
I believe that there were two steering modes. For gentle turns the two left of right tracks were braked/clutched conventionally while for sharp manoeuvres the opposite tracks were braked/clutched diagonally so as to "jack-knife" the machines. However, never seen one in the metal !
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