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Tire size on JD running gear

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nh8260
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PostPosted: Fri Sep 28, 2012 5:04 pm    Post subject: Tire size on JD running gear Reply to specific post Reply with quote

I've got a gravity box on a 963 JD running gear, someone put 215/75/15 on the front and 265/75/15 on the year, it needs tires all the way around but what is the correct size? does the back need a bigger size than the front??
 
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deerefarmer02
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PostPosted: Fri Sep 28, 2012 5:30 pm    Post subject: Re: Tire size on JD running gear Reply to specific post Reply with quote

I would recommend 9.5L-15 or 11L-15 implement tires especially with a gravity box. That is what I use on my 963 gears. All four tires should be the same size.
 
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Leroy
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PostPosted: Sat Sep 29, 2012 5:27 am    Post subject: Re: Tire size on JD running gear Reply to specific post Reply with quote

It doesn't hurt to have a bigger size on the back, was probably done either because they had them or to get more flotation and the larger size would not with the standard rims have cleared the front end for turning. New size when they were made was 7:60 X 15 6 ply and that is only a 5 ton rated gear, not 8 or 10 tons that it seams most people think they are rated at and overloading them.
 
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Leroy
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PostPosted: Sat Sep 29, 2012 6:00 am    Post subject: Re: Tire size on JD running gear Reply to specific post Reply with quote

Forgot to include that the orignal factory wheels were 5" wide rims and the 6:70, 7:10 or 7:60 and even the 8:00-8:20 tire would work on them as well. Your smaller tires are equal to the 7:10 while the larger are equal to the 8:20 and your pressent tires are probably in those passenger car size are 4 ply rated. You can buy a 7:60 in either a 6 or 8 ply rated for same money as the 9.5 L tire and they will carry the same loads, just the 9.5 will have a bit more flotation in soft muddy ground but they the extra width if you are sinking in will pull harder pushing the extra mud ahead of them. If you go with those flotation type tires you need at least a 6" or for some mentioned a 7" wide rim so unless it already has the aftermarket wide rims on you would also need to buy new rims as well as the tires to go with the flotation type of tire. Me a 7:00 X 15 light truck tire that is the same size as the 7:60 x 15 implement is what I used on both the 953 and 963 gears.
 
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hd6gtom
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PostPosted: Sat Sep 29, 2012 10:43 am    Post subject: Re: Tire size on JD running gear Reply to specific post Reply with quote

How big is the gravity box? The tires should all be the same size. If it has the narrow 5"wide rims you will need at most 7.60X15 8 ply tires. If you want to go to 11LX15's you will need a 8"wide rim.
 
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nh8260
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PostPosted: Sat Sep 29, 2012 3:18 pm    Post subject: Re: Tire size on JD running gear Reply to specific post Reply with quote

its a killbros box, i'm guessing 250-300 bushel, looks like the ones you see in the classifieds alot. I'm not familiar with the sizes of them, so you guys are saying 235-75-15 tires off a car or light truck wouldn't be heavy enough for the weight of the box loaded??
 
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Kevin B from Illinois
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PostPosted: Sat Sep 29, 2012 5:39 pm    Post subject: Re: Tire size on JD running gear Reply to specific post Reply with quote

I have 3 953 gears very good trailing wagons but these are only 5 ton gears and you will bend and axel with a gravity box bigger than say 175 bu box have had it happen with that size box.
 
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BushogPapa
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PostPosted: Sat Sep 29, 2012 5:56 pm    Post subject: Re: Tire size on JD running gear Reply to specific post Reply with quote


You should be able to find 8 Ply used tires from an older 3/4 Ton Pickup truck, etc..they usually are 7.50x16" 6 to 10 Ply..
Would be worth changing wheels to use them..
They will haul more than the wheels you are putting them on..

Ron..
 
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paul
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PostPosted: Sat Sep 29, 2012 9:17 pm    Post subject: Re: Tire size on JD running gear Reply to specific post Reply with quote

Whole new world once you get over 200-220 bu, takes a good tire to handle the pressure you put on them with 250-300 bu.

I'v got some 220 bu (typically more like 200 actual) gravity boxes, and not so much stress. I've got a pair of 250 wagons (can get close to 300 on in good crop) and those tires are bigger, and still show more stress. Doesn't sound like much difference, but it is.

Typically a gravity wagon uses the same size tire all the way around, tho doesn't hurt much to have diferent on each axle.
 
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Leroy
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PostPosted: Sun Sep 30, 2012 5:14 am    Post subject: Re: Tire size on JD running gear Reply to specific post Reply with quote

I do not know what number Kill bros could be that big except for the bottom dump No, 400. The No. 300 bed will hold about 165 bushels and that is all you want on that gear before you mash the gear to the ground, the No.250 bed is about 150 buskels and the orignal beds are 125 bushels and that is what was avaible when that gear was made. The No. 350 Kill bed is the sloped side and will hold perhaps the 200 bushels or with the extensions more but that is way to much bed for your gear. Remember that gear is rated at 5 tons and that is at tractor speeds and not the 8 to 10 tons that a lot of people seem to think they are and you need that 8 ton gear for the 350 box or heavier. The 953 that the other poster said was a 5 ton is only a 4 ton, not a 5 ton gear. and the orignal 125 bu. size is good for them if you want to keep them. There have been many a person killed with an overloaded hopper by rolling over on the tire repair person from either loosing a tire or busting an axle.
 
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GordoSD
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PostPosted: Sun Sep 30, 2012 8:10 am    Post subject: Re: Tire size on JD running gear Reply to specific post Reply with quote

Compute the weight of the heaviest load you are going to carry, divide that by 4 (tires) and make sure the tire you buy is rated to carry that. (max load is molded into the sidewall).
 
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buickandeere
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PostPosted: Sun Sep 30, 2012 11:54 am    Post subject: Re: Tire size on JD running gear Reply to specific post Reply with quote

Changing rims too or just tires?
Type of soil and what is hauling the wagon?
As previously stated, the running gear will be over stressed hauling oats or sawdust let alone wheat, corn or beans.
 
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randy hall
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PostPosted: Sun Sep 30, 2012 5:49 pm    Post subject: Re: Tire size on JD running gear Reply to specific post Reply with quote

three of my wagons are 963's. they all have 12.5x15 rib implement tires eight ply with 45 pounds air preesure. the wagons hold 225 bushels. these are some of my oldest wagons and have never had any tire problems.
 
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nh8260
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PostPosted: Sun Sep 30, 2012 7:04 pm    Post subject: Re: Tire size on JD running gear Reply to specific post Reply with quote

this one has a side door and the floor is sloped, i'll try to get a picture of it and post it and maybe you can tell me for sure, like i said i have no clue what it holds. It had extensions on it but i took them off.
 
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Leroy
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PostPosted: Mon Oct 01, 2012 4:59 am    Post subject: Re: Tire size on JD running gear Reply to specific post Reply with quote

The question is if the door sets up straight or if it is at an 80* angle instead of a 90* angle from the ground and that door side up to the top part of the box is also on a slope or straight. Kill Bros were made 30 mile from me so were very popular here.
 
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