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what HP is my D4 6U

what HP is my D4 6U

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bursitis
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Location: Oklahoma
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i am a bit confused about the HP of my D4-6U8613. were all of the U the same HP or did Caterpillar increase the HP as the years increased? Thanks

D46U straight blade,D46U cat angle blade,allis chalmers AD4 grader and Khoering 404 dragline. D4C 40A,D4 2T and scraper.

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Wed, Dec 20, 2017 2:00 AM
ccjersey
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There was an increase in hp about 1955. "Belt" hp went from 51.x to 58.x. There were also other changes to accomplish this. One was increased full load rpm. Later a mechanical balance was added to balance the engine vibrations resulting from the increased rpm. The governor got a different main spring and a different rack setting.
D2-5J's, D6-9U's, D318 and D333 power units, 12E-99E grader, 922B & 944A wheel loaders, D330C generator set, DW20 water tanker and a bunch of Jersey cows to take care of in my spare time😄
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Wed, Dec 20, 2017 3:14 AM
bursitis
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Location: Oklahoma
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i checked and i have a 6 blade fan. i think my year of mfg is 1953

D46U straight blade,D46U cat angle blade,allis chalmers AD4 grader and Khoering 404 dragline. D4C 40A,D4 2T and scraper.

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Wed, Dec 20, 2017 7:14 AM
Old Magnet
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Reply to bursitis:
i checked and i have a 6 blade fan. i think my year of mfg is 1953
The Rack Setting Charts are the best source for determining horsepower....
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Wed, Dec 20, 2017 11:08 PM
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