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  1. #1
    New Member
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    Dec 2009
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    Shuswap Lake B.C Canada
    Tractor
    Kubota B7100D

    Default Kubota B7100 Steering box

    kubota B7100 1100 hours.

    Hi Guys have had this tractor for 20 years now. Bought it used at 300 hours, and it has been well maintained,and serviced all its life.

    Pushing snow the other day the steering became stiff, and a cracking sound came out of the steering box. I had just changed the oil ,and winterized the tractor. So we ripped it apart and found the upper trust bearing in the steering box had let go, allowing the ball bearings to migrate into the areas below.

    After getting all the parts out I find the steering shaft ,that the steering wheel, attaches to has also been damaged. Went to the dealer for parts and I find this shaft is no longer available as a spare part.

    Anybody out there that can suggest a place to look for this part, or a substiute used part, would be greatly appreciated.

    Tractor still runs well and is ued around here daily for snow removal, rototilling and cutting grass.

    Thanks in advance Pacific pete

  2. #2
    Super Star Member Egon's Avatar
    Join Date
    Aug 2001
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    17,706
    Location
    Nova Scotia, Canada

    Default Re: Kubota B7100 Steering box

    Try an auto wrecker and see if you can find a manual steering box that will fit in the old ones place. Might take some revising but may work. Some of the GM circulating ball power steering boxes would fit with no problem.
    Egon
    50 years behind the times
    Livin in a
    Worn out skin bag filled with rattlin bones

  3. #3
    Elite Member
    Join Date
    Jul 2006
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    2,968
    Location
    Meridian Idaho
    Tractor
    Kubota B7100D

    Default Re: Kubota B7100 Steering box

    There's been more than a few threads on b7100 steering. When mine went out the only way I got one was out of some dealers in Texas back room. Must have been the last one.

    One option is to go to power steering, couple threads on that.

    This site:

    kubota Tractor Parts: Steering Parts || Weaver's Compact Tractor Parts & Compact Tractor Salvage

    shows some steering parts for other tractors, maybe you will get lucky and can get one that's close in length or whatever and have it modified to fit. If you go that route please post the info.

  4. #4
    Epic Contributor Soundguy's Avatar
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    Mar 2002
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    Central florida
    Tractor
    ym1700, NH7610S, Ford 8N, 2N, NAA, 660, 850 x2, 541, 950, 941D, 951, 2000, 3000, 4000, 4600, 5000, 740, IH 'C' 'H', CUB, John Deere 'B', allis 'G', case VAC

    Default Re: Kubota B7100 Steering box

    What's damaged about the steering wormshaft? The area where the bearing rides? I'd sleave it.. or weld it up and then turn it true.

    I've got a ford 8n that's had it's steering wormshaft fixed that way... 20$ vs 250$

    soundguy

  5. #5
    Veteran Member Kernopelli's Avatar
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    Oct 2006
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    Carterville, Illinois
    Tractor
    Mitsubishi MTE2000D, Dig It 258 Backhoe

    Default Re: Kubota B7100 Steering box

    Give these folks a call, if you scroll down the page you will see they carry some old kubota steering parts.

    Little Miami Trading Company - Tractor Parts Books
    Darryl

  6. #6
    Platinum Member myyaz33's Avatar
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    Aug 2006
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    560
    Location
    Nebraska
    Tractor
    TYM T273

    Default Re: Kubota B7100 Steering box

    Don't have the kubota B6100 anymore, but I bought the whole replacement assembly from the link below for $135(bottom of page). It should also fit the B7100, I think..

    No way would I spend $400 that the Little Miami Trading Company wants for one. (Call me frugal!)

    Kubota
    Last edited by myyaz33; 12-29-2009 at 08:30 PM. Reason: misc
    - TYM T273, BT200 Backhoe, LT200 Quick Attach FEL-

  7. #7
    Elite Member
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    Jul 2006
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    Meridian Idaho
    Tractor
    Kubota B7100D

    Default Re: Kubota B7100 Steering box

    Quote Originally Posted by Soundguy View Post
    What's damaged about the steering wormshaft? The area where the bearing rides? I'd sleave it.. or weld it up and then turn it true.

    I've got a ford 8n that's had it's steering wormshaft fixed that way... 20$ vs 250$

    soundguy
    I kept my old one, will have to look at it again. I think the key problem was that when the upper thrust bearing dissolved it toasted the 'ball nut' and bearings/races... which is what damaged the shaft (bad nicks). The site I posted sells a nut and bearing/race kit by themselves. Have to measure and see if that is a workable replacement or not for the b7100. Likely the nut doesn't really get damaged and a guy could get away with new/repaired worm shaft and bearings/races.

  8. #8
    Epic Contributor Soundguy's Avatar
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    Central florida
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    ym1700, NH7610S, Ford 8N, 2N, NAA, 660, 850 x2, 541, 950, 941D, 951, 2000, 3000, 4000, 4600, 5000, 740, IH 'C' 'H', CUB, John Deere 'B', allis 'G', case VAC

    Default Re: Kubota B7100 Steering box

    Bearing race? Big deal.. snatch or weld it out and replace.. that's why cups are replaceable..

    Ballnut.. permanently damaged by the upper thrust bearing disintegrated.. ok.. but I've never seen that on any steering box I've ever rebuilt that used a recirculating ballnut.. and every one of them had a thrust bearing in some state of damage from near good to nonexistant.

    nicks on the shaft? where? 95% of the shaft is not a contact surface so nicks don't count. nicks on a bearing surface can be fixed by sleave or build/cut.

    post back some details.. unless you are just dead set on $$$BUYING$$$ a replacement, vs FIX$ING your current one.

    soundguy

  9. #9
    New Member
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    Dec 2009
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    Location
    Shuswap Lake B.C Canada
    Tractor
    Kubota B7100D

    Default Re: Kubota B7100 Steering box

    Thanks for all the replies,and suggestions.

    I took the steering shaft to a machine shop today. They are going to rebuild the bearing surface on the shaft, by welding, and then turning it down to fit the new bearing. Cost estimate is $100.00.

    I bought new bearings and seals at a bearing supply store, so will be set to go, once I put it together.

    kubota dealers around here ,were helpful, but only on new parts. There is a substitute,steering shaft that is still available, but it is 3/4 longer, which is no big deal. Cost 255.00 from Kubota.

    Had this tractor for over 25 years now, so it is time to look for a newer version of Kubota.

    Thanks for your help and relplies, they were a big help. Happy New Year to all Pacific pete

  10. #10
    Elite Member
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    Jul 2006
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    Location
    Meridian Idaho
    Tractor
    Kubota B7100D

    Default Re: Kubota B7100 Steering box

    Quote Originally Posted by Soundguy View Post
    Bearing race? Big deal.. snatch or weld it out and replace.. that's why cups are replaceable..
    I meant the 'races' (tubes) for the recirculating bearings.

    Quote Originally Posted by Soundguy View Post
    Ballnut.. permanently damaged by the upper thrust bearing disintegrated.. ok.. but I've never seen that on any steering box I've ever rebuilt that used a recirculating ballnut.. and every one of them had a thrust bearing in some state of damage from near good to nonexistant.
    My old ballnut does appear to have some superficial nicks in it. I think the key problem is between the nicks on the shaft and the damage to the tubes bearings were allowed to slip out. If you assemble my old one and run it back and forth a bit bearings start falling out of it.

    Quote Originally Posted by Soundguy View Post
    nicks on the shaft? where? 95% of the shaft is not a contact surface so nicks don't count. nicks on a bearing surface can be fixed by sleave or build/cut.
    What do you mean by 'sleeve'?


    Quote Originally Posted by Soundguy View Post
    post back some details.. unless you are just dead set on $$$BUYING$$$ a replacement, vs FIX$ING your current one.
    Well, I am not the OP... my tractor works I am just curious because I think I bought the last new b7100 ball nut assembly in existence. I also recently acquired a small lathe so I am curious now if I can fix my old one.

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