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John Deere Tractors Discussion Forum
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36 vs 38 inch rear wheels

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55 50

02-07-2008 14:54:19




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Does anyone know the reason(s) that Deere used 36 inch wheels instead of 38 inch on the rear of the 520 and 530? I have a 50 and it has 38 inch wheels and I was just curious.




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Texasmark

02-09-2008 07:33:17




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 Re: 36 vs 38 inch rear wheels in reply to 55 50, 02-07-2008 14:54:19  
Here's a SWAG. Had a 4020 with 36" and it was roughly 96 PTO hp. Now I have a 4230 which is said to be a newer version of the popular 4020 but the factory did some engine work on the 404 and it puts out 100 PTO hp.

The diameter of the wheel is definitely part of the final drive. So, why wouldn't mother deere use the gearing from the 20 which was already in production and just up the diameter of the tire to accommodate the added torque/hp of the 30.

Makes sense to me and that very well could explain similar things on other tractors.

Otherwise, I have no clue as the width is 18.4 for both and the difference in the ground contact length for the two different diameters is not that much.

My 2c,

Mark

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BushogPapa

02-08-2008 20:02:42




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 Re: 36 vs 38 inch rear wheels in reply to 55 50, 02-07-2008 14:54:19  
I have an Idea that JD put the 36" option on the 530/520 to get the Max Pull to be as high as it is listed...(4,700Lb) compared to 3,500 for the 50 My 520 is as healthy as about any you will find and it has 38" rear wheels and it sure won't pull a bit more than our '52 "B" that was bored +180" in 1960.. That even includes PTO work too.. One thing I have seen is that a 50 or 520 sure looks Great with 36" rears and 15" front tires..they look like an over-grown riding mower..!!

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Mike M

02-08-2008 12:18:46




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 Re: 36 vs 38 inch rear wheels in reply to 55 50, 02-07-2008 14:54:19  
I don't know why ? But both sizes were available straight from the factory as options.

Maybe someone in purchasing screwed up and ordered a truck load of 36" tires and wheels by mistake and then found a way to cover it up ? LOL



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Duane Larson

02-08-2008 06:58:23




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 Re: 36 vs 38 inch rear wheels in reply to 55 50, 02-07-2008 14:54:19  
I guess my service school information is different. My "John Deere Plow Co. 1957 Service School" manual, in the 520 Section on p.4 under "Final Drive" notes "The final drive gear ratio is increased because of increased engine rpm". The rim and tire size is not addressed in the 520 section of my version. Lots of other changes were made between the 50 and 520.

It may have been a clearance issue - the clearance (I assume under the rear axle housing for corn cultivation) is listed as 24 3/4" for the 520, and my 50 (with 38" rears) also measures 24 3/4".

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Rich Va

02-08-2008 04:40:25




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 Re: 36 vs 38 inch rear wheels in reply to 55 50, 02-07-2008 14:54:19  
I heard the same thing as raddlechain. The 50 I have someone had flip flopped the original 38" wheels with 36" 520 wheels. I recently changed it back to the F 1500 R center,10X38 rims and 12.4 X 38 tires. Looks much better. I have also heard that Deere may have put a few 36 inchers on some of the 50s but I can't find any evidence of that. I have a 1955 model also.



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raddlechain

02-07-2008 15:28:43




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 Re: 36 vs 38 inch rear wheels in reply to 55 50, 02-07-2008 14:54:19  
According to an old Deere Service School textbook, one reason was because of the increase in engine rpm on the 520, 36-inch tires could solve the problem rather changing a lot of the gearing. Don't know if that's true or not.



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