Caterpillar Dual D-9's Pushing Scrapers

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muckshifter 631c
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Caterpillar Dual D-9's Pushing Scrapers

Post #1 by muckshifter 631c » Fri Feb 08, 2013 5:04 pm

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

Post #2 by martyn williams » Sat Feb 09, 2013 11:17 pm

Rare footage there :thumbup: good find.
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Re: Caterpillar Dual D-9's Pushing Scrapers

Post #3 by modelman093 » Sun Feb 10, 2013 1:11 am

Two, but not dual, D9s pushing a Blackwell 657 in about 1966.
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Re: Caterpillar Dual D-9's Pushing Scrapers

Post #4 by muckshifter 631c » Mon Feb 11, 2013 6:34 pm

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

Post #5 by modelman093 » Mon Feb 11, 2013 10:47 pm

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

Post #6 by Engine Tech » Sun Mar 01, 2015 7:10 am

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

Post #7 by Engine Tech » Sun Mar 01, 2015 7:10 am

OOPS. Cat called them the DD9G.


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Re: Caterpillar Dual D-9's Pushing Scrapers

Post #8 by Dah » Sun Mar 01, 2015 10:46 am

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

Post #9 by modelman093 » Sun Mar 01, 2015 8:56 pm

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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