Ford 7710 MFWD Drive Train Ratio

[sandman2234]

Website TractorData.com - information on all makes and models of tractors lists tire sizes.
David from jax

 

[milkman636]

http://digitalcommons.unl.edu/cgi/viewcontent.cgi?article=2798&context=tractormuseumlit

Tires used in Nebraska Tractor Test #1432

Rears: 18.4-34 6 ply
Fronts: 13.6-24 8 ply

These were picked by Ford before they shipped the tractor to Nebraska for testing.

193 rear circumference/140 front circumference = 1.379:1 for equal speed

 

[kjung17]

Static loaded dimension taken from michelin ag website.

1-(31.3/24.1)x1.144=X

1-1.299x1.144=X

1-1.486=X

.486=X

I'd say you are just under the 5% threshold.

 

[Bpp0327]

I bought this tractor as 2nd hand so I guessed some smart farmer along the line changed the tyre size before it ended up in the dealer shop.

Anyway, thanks a lot folks for all the lesson learned.

Thank you all for your time, appreciated.

 

[milkman636]

ratio math:

15.82x1.144=18.113
23.76/18.113 = 1.312:1 front/rear ratio

using circumference from:
Michelin AG - Products - Agribibï½®

(159.4 x 1.312) / 207 = 1.01 or 1% overspeed

using kjung17's formula:

1 (minus) REAR STATIC LOADED RADIUS/FRONT STATIC LOADED RADIUS x MFWD RATIO = è*Ž

1- 31.3 / (24.1 x 1.312) = x
1- 31.3 / 31.62 = x
1- .989 = x
0.011 = x

If you don't notice the front pulling or dragging you are probably AOK.

 

[slowzuki]

Sounds like the right sizes.

 

[D7E]

I bought this tractor as 2nd hand so I guessed some smart farmer along the line changed the tyre size before it ended up in the dealer shop.

Anyway, thanks a lot folks for all the lesson learned.

Thank you all for your time, appreciated.

They would be normal for that tractor if it was in europe !