Yanmar 1610D Inter Axle Ratio

[RichardDLee]

Hi everyone,

I'm in the UK so don't have the ability to buy the turf kit from Hoye.

I am trying to get a UK company to manufacture some wheels but I can't find the inter axle ratio number anywhere.

Does anyone know it for my tractor?

Does anyone know where it's stamped on the tractor?

Can anyone help in anyway?

Thanks for your help.

 

[bmaverick]

I am trying to get a UK company to manufacture some wheels but I can't find the inter axle ratio number anywhere.

When stating the, "axle ratio number", are you asking about the lug-to-lug spacing and ratio that we call the "Bolt Pattern"?
Here's a link on how we understand it here in North America. Wheel Tech - Bolt Pattern

There is a listing I've come across about Yanmar tractor rims for sizes and bolt patterns.

Yanmar made many tractors for John Deere and on the JD parts site they do list Bolt Patterns too. This is sometime we all need because of outer rear tire wheel weights.

 

[RichardDLee]

Hi,

No, not the bolt pattern. Hoye generously gave me that information in full.

I mean the number between 1 and 1.5 that you need to ensure that when replacing the 2 tyres or wheels you keep the ratio of the 4wd system the same.

Thanks for your help though.

 

[bmaverick]

OK, look up Fredricks Imports website. Call and contact the parts service desk. I do know they have the answer. They have several HUNDRED parts and service manuals right from Yanmar to look up the info. The down side is, the manuals are written in Japanese. Just maybe someone has the knack to know where to look on the detailed summary sheet for the 4x4 info. Or maybe email them with the question in full like you had to explain to us here.

Fredricks totally restores Yanmars to better than factory condition. They know what works with what, especially the info you are looking for.

PS, once you find out, help others here who tend to search these forums often, and post your answer.

 

[bmaverick]

OK, look up Fredricks Imports website. Call and contact the parts service desk. I do know they have the answer. They have several HUNDRED parts and service manuals right from Yanmar to look up the info. The down side is, the manuals are written in Japanese. Just maybe someone has the knack to know where to look on the detailed summary sheet for the 4x4 info. Or maybe email them with the question in full like you had to explain to us here.

Fredricks totally restores Yanmars to better than factory condition. They know what works with what, especially the info you are looking for.

PS, once you find out, help others here who tend to search these forums often, and post your answer.

PSS, Oh, found out that Yanmar 4x4 isn't locking. It's "open" thus it's really 3-wheel with the rear wheel differential lock engaged.

 

[bmaverick]

This is the closest I have found dealing with 4x4 tire ratio forums for Yanmar ...

Yanmar 3110D 4x4 Rear Tires

It's a strange forum to post, BUT so easy to search by title descriptions. ( control-F in the browser)

Here's a little more info on the ratio. A good input on testing the 4x4 tire size on the tractor.
Yanmar 1300D 4x4 Tire question

 

[California]

I mean the number between 1 and 1.5 that you need to ensure that when replacing the 2 tyres or wheels you keep the ratio of the 4wd system the same.

I think the best way to research that, is look up the 'rolling circumference' of the prior and replacement tires in a tire manufacturer's website. I don't think the information is available anywhere else.

One thing to watch out for is Yanmar sometimes used different internal gearsets along with the different tire size options. So simply switching to a different tire combination that was also used on your model might be a disaster if that other option had different gearing.


As for the 'locking' 4x4: moving the lever gives a direct mechanical connection to the front driveshaft, unlike some bogus automotive systems like 'RealTime 4x4' whatever that means, which never transmit full power to the other axle.

 

[normde2001]

Simply measure the rolling circumference of a front and rear tire and divide the rear by the front #'s.

 

[RichardDLee]

Thanks to all for your replies.

I could measure the current tyres but this is only a rough number that the wheel manufacturers aren't keen on using as they think its not accurate enough.
Also - if the tyres that were put on it last were wrong I'm just copying their mistake.
Maybe their mistake was small enough to not matter and mine is too but together it could cause a problem.

So that is why I am trying to find the actual number for the ratio.

I've emailed Frederick's and had an initial response but I'll wait until Monday and see if they can find me the number.

Both Hoye and Frederick's didn't need to help me as being in the UK I can't use them but Hoye were so helpful and I'm hoping Fredericks will be too.

Thanks.

 

[winston1]

According to the 220/226 repair manual it has a 1.603 to 1 front axle to rear axle ratio.

To arrive at that the differential ration is 5.4 to 1, final drive ratio 5.9 to 1 giving a total of 31.86 to 1.

Front differential ratio is 4.5 to 1, front drive shaft gear to bevel pinion reduction ratio 1.571 to 1, front final drive gear to pinion reduction ratio 2.308 to 1. Front drive total reduction ratio 19.87 to 1.

Divide 31.86 by 19.87 and we get 1.603 to 1.

Put all this down just to show it is sort of a long process to arrive at the front to rear ratio. I think the only way you will do it is to match part numbers with a US sold model. In the front of the parts lists on US sold models there is a page giving gear teeth on all the drive line. If you had that for the grey you could figure the ratio but the parts manuals I have for the greys do not include that.

Do you have a parts list for your 1610D?

 

[Roonabeck]

Couldn't you determine the gearing ratio experimentally, say by jacking up the right front and right rear off the ground, putting in 4wd, and counting both the front and rear revolutions until you've reached something like 100 revolutions of the back tire? Divide and you have your ratio?

 

[winston1]

Sure, if you don't go to sleep.

 

[bmaverick]

Sure, if you don't go to sleep.

Use "creep" gear too. haha

Still, if nothing prevails, the 100 rotations off the ground may be the method in a pinch. :dance1:

 

[RichardDLee]

I can get the front off the ground with the FEL but where are the jacking points for these tractors?

Thanks for all the help, sorry for all the questions.

Cheers.

 

[winston1]

About anywhere you want to put the jack on the rear end.

 

[284 International]

I think your best bet is to do as was suggested and jack the tractor up then compare the actual rotation of front and rear tires. A strip of tape or paint on each tire would assist keeping track of the revolutions. It should be straightforward to get sufficiently accurate results: 1/8 revolution of the front tires should be easily discernable, more or less, so that means you should easily be able to get within 1/8 of the precise ratio of turns, and taking it to 100 turns means you should be able to easily determine the ratio within 0.125%. That is more than accurate enough for your purposes, and won't take very long.

 

[California]

Maybe I'm wrong but I thought tire manufacturers publish rolling circumference, to be used by vehicle designers when choosing gear ratios. Anybody know for sure if this is the case?

But I agree that the count revolutions method should work fine too.

 

[284 International]

Maybe I'm wrong but I thought tire manufacturers publish rolling circumference, to be used by vehicle designers when choosing gear ratios.

At least some of the tractor tires have rolling circumferences available, occasionally requiring some searching. I would want to check just to be sure of what the actual ratio is; some machines came with different gearing if equipped with certain tire options, as you pointed out. With that said, Hoye only shows one part number for the front axle, RGP-4311. But there are gears in the hubs too, so those might be the more easily altered set, or perhaps the rear gears would be those changed. I have no idea.

However, if it works "as-is" an exact duplication of the current tires' rolling circumferences in turf form should work. But not knowing if they are currently at the high, low, or middle of the suggested percent overrun for front drive wheels, I would feel better knowing which way to err, since it is improbable that the turf tires (pickup tires) and paddy tires will be exact matches for circumference.

 

[California]

Way off topic: My neighbor who harvests apples into 3/4 ton loader bins says trailer tires are the only type that will hold up to heavy front-axle loads that are driven across rough ground.

 

[clemsonfor]

Is it that sensitive? think about putting a new set of R1s on the front or ricers and you have an old wore out set on the back? there is easily a few inches difference in heights that the facotry would of had?