YM1810D Gear factor

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elk1810
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YM1810D Gear factor

Postby elk1810 » Mon Feb 19, 2018 11:05 am

Does anybody know the gear factor between front and rear axle in four-wheel-drive-mode ?
I need to know how many turns a front wheel makes during one turn of a rear wheel.

Thank You

Regards

alan
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Re: YM1810D Gear factor

Postby alan » Mon Feb 19, 2018 12:44 pm

Why?

winston
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Re: YM1810D Gear factor

Postby winston » Mon Feb 19, 2018 6:17 pm

The only place I have seen that information Is in repair manuals for US sold tractors. The 226 has a 1.603 to 1. That would be the closest tractor to your 1820 but I have not idea your ratio is the same. Are you shopping tires?

Muzmic
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Re: YM1810D Gear factor

Postby Muzmic » Mon Feb 19, 2018 6:41 pm

Unless the front and rear tires are rotating at different rpm, the back tire circumference divided by the front tire circumference shows ratio.

elk1810
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Re: YM1810D Gear factor

Postby elk1810 » Tue Feb 20, 2018 1:19 am

No I am not shopping tires. The reason why I want know it is the following:
Now I am using at the front axle old, worn Bridgestone Farm Service LUG M 5-14 tires and at the rear axle old, but good Bridgestone Farm Service LUG Special 8.3-24.
I must replace the front tires because the are a) worn and b) they dont have enough load capacity (only 250kg) and I need minimum 340kg per tire.
So I want to use Trelleborg IM110 5.00-14 (they have 350kg).
According the Bridgestone data-book the old tires have a circumference from 1838mm, the Trelleborg tires have 1913mm.
As I know from others four-wheel-drive-tractors the front tires should run 1%..5% faster than the rear ones. So if the new tires are too big they may run too much faster, so I want to calculate this. Therefor I need the gear factor.

alan
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Re: YM1810D Gear factor

Postby alan » Tue Feb 20, 2018 5:34 am

You needn't worry about the load capacity of the fronts unless you have a front loader. Or about the F/R ratio if (as you should) it's close and you put it in 4 only when you're moving slowly, for short distances, and there's slippage.

To measure the circumference of worn and mounted rubber, fix a tape to the top (using tape, fast epoxy or a thumb-tack), drive one rev over the tape, and get the measure.

Or, in 2, straight and level road, chalk-mark the top (or bottom) and drive several wheel revolutions. From where the marks end up, you can tell if you need fronts of the same, taller, or shorter height, which you tell the tire supplier when you bring your fronts in.

You can modify the ratio a smidge by adjusting the pressure.
Last edited by alan on Tue Feb 20, 2018 3:10 pm, edited 1 time in total.

elk1810
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Re: YM1810D Gear factor

Postby elk1810 » Tue Feb 20, 2018 5:59 am

I have a loader. And I have weighed the tractor at the front axle. It weighs approx. 600kg.
For driving this tractor on the road in Germany I must show this tractor to a technical supervising organisation (TSO) to get a certificate.
This organisation checks amongst other things, if the tire-load matches to the maximum permissible load of the axle.
If have a copy-certificate from a YMG1800D (also with loader) which has a maximum permissible front-axle-load from 680kg. I must convince the employee from the TSO to assume the same value for my tractor. This only works if I have the correct tires.
So I think I will use the chalk-on-the road method to determine the gear factor.

Norm
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Re: YM1810D Gear factor

Postby Norm » Tue Feb 20, 2018 9:41 am

Don't worry about it. You are talking about a 75mm difference in circumference, or 3" to us Americans which is negligible. Slight difference in tire pressure can easily make that up.

alan
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Re: YM1810D Gear factor

Postby alan » Tue Feb 20, 2018 3:15 pm

And here I thought WE were over-regulated!
Could you not use a trailer to transport it, and keep the present fronts until they give up?


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