Tractor Sizing yanmar 1500d

[hogfly]

hello all this is my first post hope you guys can help dad has a yanmar 1500d stock rims on front brand new 6-14 r1 tires on them he bought hoyes rear turf rims to gain wheel space wants to go with r1s i searched for 3 weeks closet thing i could find was goodyear dyna torqe 11.2-16 will this be enough to mess with ratio the goodyear is 35.5 tall thanks guys kenny

 

[clemsonfor]

anybody know the stock height for the 1500? If within 5% id say your good?

 

[hogfly]

they tell me stock would be 37.5 but i am up 1 size on front and 35.5 on rear how critacal is this i mean what about wear will the front drag the back or do i worry to much

 

[clemsonfor]

If your in tilled ground or mud i would not worry that much, but i would not use 4wd if the ratio is more than 10% different than the original ratio front/back between old and new set. I really dont know the %tage u need to stay in, one of the real gurus will know though.

If on hard sod or concrete or asphault, unless withing the wiggle room i would not use it at all!!!

But in loose ground the tires will just slip the needed amount. If off to much it can bind up the drive line making taking it in and out of 4wd difficult, like on an old truck. You know your front and rear diffs need to be the same with same tires or else you bind up and start poping stuff like U-joints, driveshafts, yokes , gears or input shafts!!!!

 

[California]

The front needs to lead the back by a little, since the front tires go farther when turning.

It will slip in and out of 4x4 easily when the tire diameters are right. But as Clemsonfor said, if it's straining then expensive stuff is going to wear out quick - or worse.

 

[winston1]

The ym220/226 service manual says front wheel pre-run percent should be 1 to 4% with a wear limit of 0 and 6%. Just guessing that range would be pretty close for most of the grey Yanmars.

 

[hogfly]

so what % am i off front calls for 5-14 i have a 6-14 rear calls for 8.3-22 i have been told new ones are 37.5 tall the ricers on it measure 36 tall (must be worn some) seems to work fine so i will only change rears to the 11.2-16 35.5 tall do you guys think this will work $900.00 wasted money can i change front to match the 35.5 thanks to all for your help

 

[clemsonfor]

I think the only difference between the 5-14 and 6-14 is the width of the tire. But the new tires in the rear seem to short just quick thinking. Why pay 900 for tires anyway were the old ricers chewing up the yard?

 

[winston1]

You need to know the front to rear ratio on the 1500. Also the circumference of the tires. Then you can accurately figure the lead. Many folks say it doesn't matter that much. I am of the persuasion circumstances of use can make a big difference.

 

[hogfly]

yea they do no traction in gravel or hard sod useless to me on mountin side no rice here and correct me if im wrong but i think a 6-14 is taller than the 5-14 got me worried nobody seems to have a firm ansewer dont know lost on this ratio '''''''''' will my set up work guess i will be the guinia pig i will let you guys know thanks men

 

[California]

guess i will be the guinia pig i will let you guys know thanks men

Looks like nobody can provide the answer so you are stuck doing the original research.

Here's a start for the research. These ag tire reference books list the rolling diameter of the original YM1500D tires, and the diameter of what you might buy as replacements to maintain the same front/back ratio.

goodyear farm tire data book - Google Search

Please post what you learn! :thumbsup:


PS for anyone else interested: The Goodyear book also has charts showing the weight of water ballast for various size ag tires.

 

[ritchieb]

These are the sizes I switched to on a 1610D and have had no problems in two plus years now.

Stock tires: (Bridgestone)

8.3x22 = 113 inches RC, OD = 37.5 inches, rim width = 7 inches
5x14 = 72 inches RC, OD = 23.8 inches, rim width = 4 inches

wide tires: (Titan)

12.4 x16 = 106 inches RC, OD = 37.6 inches, rim width = 11 inches
23x8.5x12 = 69 inches RC, OD = 23.1 inches, rim width = 7 inches

 

[winston1]

This are the sizes I switched to on a 1610D and have had no problems in two plus years now.

Stock tires: (Bridgestone)

8.3x22 = 113 inches RC, OD = 37.5 inches, rim width = 7 inches
5x14 = 72 inches RC, OD = 23.8 inches, rim width = 4 inches

wide tires: (Titan)

12.4 x16 = 106 inches RC, OD = 37.6 inches, rim width = 11 inches
23x8.5x12 = 69 inches RC, OD = 23.1 inches, rim width = 7 inches

For what it is worth if your front to rear ratio on your 1610 was the same as a ym220 (1.603) your stock tire ratio would have been 2.138, wide tire ratio would be 4.346. Still within tolerance. Haven't a clue what the 1610 front to rear ratio actually is.

Not sure this Firestone lead/lag instruction will come over but will try. http://www.firestoneag.com/webres/File/Tire-Info/TireInfo-LeadLag.pdf

 

[ritchieb]

Perhaps this may be of use also for those interested:

Can I use a different size tire on my 4wd tractor

 

[hogfly]

turns out winston1 was right contacted titan tire enginer he said he needs tractor ratio gave him factory tire sizes he said not good enough take or give 1-5% but needed tractor ratio to see if yanmar is on top or bottom of this scale does anyone know this ratio

 

[winston1]

The 1500d and 1610d use the same tires so I would assume the front to rear ratio would be the same. Assuming the rolling circumference on the tires Ritchieb listed is correct for original Yanmar tires you can use 1.603 as a ratio and go through the formula and your front tire lead would come out at 2.138 which is very close to the middle of the desired range. The 1.603 ratio is what is given in the ym220 manual. Different tires completely.

Having babbled all that, what I am sort of suggesting is to use 1.603 as the ratio to use. Is it correct? I don't know. Is it close? I'm guessing it is.

To get the correct ratio you are going to need to find a us sold yanmar using the same size tires and get the ratio out of that manual. I have not been able to find any such animal. Also doubting the grey information is available unless you found it in a Japanese manual.

Take all I have said lightly, mostly just my opinion based on a little research.