Yanmar 1610D Inter Axle Ratio

[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?