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  1. #11
    Silver Member
    Join Date
    Apr 2001
    Posts
    241
    Location
    Vermont
    Tractor
    sold - Kubota L2850 DT-7 4x4 Shuttle Shift

    Default Re: Front Differential TROUBLE!

    JBS,

    The rear support that holds the front axle on the tractor "normally" has 4 bolts. Mine only had 2 bolts remaining and the other two were very loose! This must have allowed movement of the front axle that caused the pinion shaft to break. Like I said in my first post, this could have been avoided by a bit of vigilance of bolt tightness...

    This just gave me a thought... I did an oil change about 30 hours ago... One would think that I would have noticed those bolts being loose... In those last 30 hours, I've done quite a lot of driving on the road... I wonder if that caused more vibration which caused the bolts to loosen!?!? Just speculating...

    The tractor has about 1100 hours and it has been very reliable and a hard worker.

  2. #12

    Join Date
    May 2002
    Posts
    1,064
    Tractor
    Yanmar 1500D

    Default Re: Front Differential TROUBLE!

    Those bolts should never have come loose. Either they weren't properly installed at the factory or someone else has had it apart and failed to properly install them.

  3. #13

    Join Date
    Jun 2002
    Posts
    232
    Location
    NE Texas
    Tractor
    Kubota L35 TLB, John Deere 550 dozer, Cat D-2 dozer, Allis Chalmers HD-11 dozer

    Default Re: Front Differential TROUBLE!

    Hi billboe,

    As the others have mentioned, replacing a ring and pinion and the subseguent set-up of the same is a very exacting and tricky business. These gears are hypoid gears, and they are only sold as matched pairs because the clearence between the teeth must be absolutely perfect or they will whine or give short life. This means the set-up has to be perfect also. Along with the backlash and pinion depth, you must also get the preload on the bearings correct. A dial indicator, machinist blueing, and an inch pound torque wrench are some of the tools you bring to this job.

    But, there is one way you could do this job yourself. And that is to purchase a good used "third member assy". The third member, or pumpkin, as it's sometimes called, consists of the gears shown in your parts image all bolted togeather and set up in the cast iron housing. You simply pull the old one out, and replace with the new (used) one. You will have to remove the axles, but other then that is bolt out-bolt-in.

    Of course, this assumes you can find a good used one, I'm not familar with used tractor parts, so I don't know about availability.

    I can advise you how to tell a good used one from a bad one. If you decide to go that way, and need any help, just drop me a email.

    Dave Perry


  4. #14
    jbs
    jbs is offline

    Join Date
    Jun 2002
    Posts
    30
    Location
    irmo,sc
    Tractor
    kubota L3000DT

    Default Re: Front Differential TROUBLE!

    Bill,

    Thanks, I forgot about the loose bolts in your orginal post. I'm sure that had a lot to do with the failure.Seems to be a lot of post about loose bolts, guess that needs to be a part of our pre-operation check list. Looks like I will have to order a case of lock-tite!



  5. #15

    Join Date
    Jun 2002
    Posts
    204
    Location
    Aiken, SC
    Tractor
    Kubota 3710, 1970 Leland 384

    Default Re: Front Differential TROUBLE!

    jbs,

    Just remember that the strong red stuff will make it real hard to remove the bolts later. You might want to go with the non-industrial strenght.

    Don

  6. #16
    Epic Contributor Soundguy's Avatar
    Join Date
    Mar 2002
    Posts
    46,369
    Location
    Central florida
    Tractor
    ym1700, NH7610S, Ford 8N, 2N, NAA, 660, 850 x2, 541, 950, 951, 2000, 3000, 4000, 4600, 5000, 740, IH 'C' 'H', CUB, John Deere 'B', allis 'G', case VAC

    Default Re: Front Differential TROUBLE!

    Our heavy service trucks and heavy equipment all use matched sets of ring and pinions.. most manufacturers won't even sell them any other way.

    Soundguy

    "If you broke the "pinion" gear (the one you pointed out), you will probably be forced to buy the ring gear along with it. A lot of these come as a set and are meant to work together. Not necessarily true in cars/trucks, but I have had this experience with tractors and equipment."

  7. #17

    Join Date
    Aug 2000
    Posts
    235
    Location
    Saratoga N.Y.
    Tractor
    Kubota 2710

    Default Re: Front Differential TROUBLE!

    They do infact engage each other, They need to have a fairly tight/exact fit togehter. Usually there are shims that are purchased and installed in front to the pinnion shaft that you broke. This will allow the gears to mesh correctly and overcome some variation due to the casting of the housing assembly. You need the shop manual for this so that you know what the acceptable 'play' in the gear mesh is. You actually coat the ring gear with prussian blue dye and spin itwith the pinnion gear to leave marks on the ring gear. This will show you how the pinnion gear is hitting each tooth on the ring gear. You then add/remove the shims until you get the proper 'wear' pattern. If this is not done you will get alot of noise out of the differential, as well as shortened gear life. This can be done by you, but you need the shop manual for the tolerances, as well as other helpful info. Hope this helps.....

  8. #18
    New Member
    Join Date
    Apr 2002
    Posts
    19
    Location
    NC
    Tractor
    L2550

    Default Re: Front Differential TROUBLE!

    Been there, done that. First find a competent FWD mechanic and talk to him about working on it, second jack up the front end and remove the whole front differential, take it to him with the shop manual. After it's apart he can show you the parts you'll need in the manual, scoot to the kubota shop and purchase them. My ring&pinion was about 350.00 and yes they came as a matched pair, if you have over 1000 hrs. on the machine replace the carrier bearings (on each side of the ring&pinion) and all seals it's cheap insurance as long as you have it apart.
    The ring &pinion have to be meshed perfectly, the mechanic will need to have the shop manual to know these specs. Total for mine not including labor was 500.00, this is not brain surgery and can be accomplished by any competent FWD mechanic but unless the R&P is setup correctly it can be toast in one hour. Make certain you have a jack under the diff. to lower it after unbolting, two people can load it in the back of a pickup, hope this helps.

  9. #19
    Silver Member
    Join Date
    Apr 2001
    Posts
    241
    Location
    Vermont
    Tractor
    sold - Kubota L2850 DT-7 4x4 Shuttle Shift

    Default Re: Front Differential TROUBLE!

    Thanks for all the posts... I currently have the front end off and in pieces... [img]/w3tcompact/icons/eyes.gif[/img] The new parts are on order and should be here by the end of the week. Besides the advice from all of you, I am getting advice and pointers from an expert, so, hopefully I won't screw it up too badly! [img]/w3tcompact/icons/smile.gif[/img]

  10. #20

    Join Date
    Sep 2001
    Posts
    501
    Location
    South Weber Utah
    Tractor
    Kubota B2710

    Default Re: Front Differential TROUBLE!

    Let us know how it goes.

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