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Tractor Talk Discussion Forum

Model R Hosepower

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Aaron Ford

11-01-2006 23:44:36




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I was reading the featured article about the John Deere Model R and was surprised to see that with a 416 cubic inch diesel, the rated output was only 34.45 HP at the drawbar. This in a 7000lb tractor. Is this correct? J/C Aaron




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Leroy

11-02-2006 13:51:02




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 Re: Model R Hosepower in reply to Aaron Ford, 11-01-2006 23:44:36  
Remember RATED horsepower is 75% of maximum on drawbar while Belt (PTO) horsepower Rated is 85% of maximum. When most places the maximum Horsepower figures are used then you look at rated it makes a big change even for the same tractor and most tractors were rated max belt HP.



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55 50

11-02-2006 08:52:19




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 Re: Model R Hosepower in reply to Aaron Ford, 11-01-2006 23:44:36  
In addition to what the others said, the R was also a new champ for fuel economy, the best at that time. (just had to add this!, which 'hose' were you referring to in your title? lol)



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Tramway Guy

11-02-2006 06:18:17




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 Re: Model R Hosepower in reply to Aaron Ford, 11-01-2006 23:44:36  
The 'R' had 43 HP at the belt. The drawbar HP was after all the frictional losses in the drive train, plus losses just moving its own weight around, approximately 25% losses in fact.

The Rated RPM of the 'R' was only 1000, so 416 cubes translated into extremely high torque, but not much total power. Hard to believe that it was approximately equal to a WD-45 Allis Chalmers rated the same in Belt HP, but with 39HP at the drawbar...only 10% losses. Most likely because it was only slightly more than half the weight of the lumbering 'R'. But for pulling dead weight all day long out on the Wheatfields, they were great.

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Aaron Ford

11-02-2006 07:08:24




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 Re: Model R Hosepower in reply to Tramway Guy, 11-02-2006 06:18:17  
Oops, I wonder what hosepower is?

I reckon the total power output is not the real factor here. The traction that 7000 lbs would provide and the stability of such a large chassis would certainly be welcome in any situation. As I recall, none of our tractors really ever ran out of power. Traction was always the weak link.

Yeah, I want one....



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Bob

11-02-2006 07:41:15




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 Re: Model R Hosepower in reply to Aaron Ford, 11-02-2006 07:08:24  
Hold out for an 830. About TWICE THE HP in about the same package, and TOUGHER, with it's 3 main bearing crankshaft!



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buickanddeere

11-02-2006 08:07:50




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 Re: Model R Hosepower in reply to Bob, 11-02-2006 07:41:15  
Black dash 820 is everything an 830 is without the price. Or 840 industrials, they sell for salvage steel price. The standard chassis tractors are built for different applications than the row crops. In the US a standard is a rarity east of the Mississippi. And in the west seen mostly in the plains states.



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bill mar in western ny.

11-02-2006 16:03:46




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 Re: Model R Hosepower in reply to buickanddeere, 11-02-2006 08:07:50  
send some of them 840 industrials going for scrap prices east, i will buy a couple of them.



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buickanddeere

11-02-2006 16:26:03




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 Re: Model R Hosepower in reply to bill mar in western ny., 11-02-2006 16:03:46  
Two running 840's in Washington State went for $2,200 each in the spring of 2004. The owner of Renaissance Tractor watched them go. The hauling charges east would have been over ten grand.



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Bob

11-02-2006 04:33:06




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 Re: Model R Hosepower in reply to Aaron Ford, 11-01-2006 23:44:36  
Yes. Nebraska test # 406, April 19-28, 1949.



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