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Kubota Axle Thunk


 
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Mnethercutt
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Joined: 01 Nov 2016
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PostPosted: Fri Dec 22, 2017 7:21 am    Post subject: Kubota Axle Thunk Reply to specific post Reply with quote

I know this is an antique tractor forum, but I figured maybe someone on here could point me in the right direction.

My dad has a Kubota B7500 that makes a "thunk" noise in the right axle when moving. If you go really slow it doesn't make the noise so we haven't been able to figure out if it's a certain spot or not. Seems like its random, but it doesn't sound good. So far the tractor is still running fine but we'd like to try and figure it out. Tractor is way past warranty and we don't have the money to take it in, so is this something we could fix on our own?

Any thoughts appreciated.
 
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carvel minne farmer
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Joined: 13 Aug 2017
Posts: 1651
Location: carvel alberta canada

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PostPosted: Fri Dec 22, 2017 7:45 am    Post subject: Re: Kubota Axle Thunk Reply to specific post Reply with quote

good morning Mnethercutt, suggestion, have you tried jacking up the right rear wheel and spinning it by hand? my first 2 thoughts are either bearing or axle shaft spline? one of the splines broken off? give the dealer service dept. a call and run it past them. and get your manual out it will give you a good place to start.
 
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Mike M
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PostPosted: Fri Dec 22, 2017 8:18 am    Post subject: Re: Kubota Axle Thunk Reply to specific post Reply with quote

Not too familiar with that model ? But many of the B series have wheel hubs that clamp to the rear axle. So maybe just some loose clamp bolts ?
 
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showcrop
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Location: Chester NH

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PostPosted: Fri Dec 22, 2017 10:11 am    Post subject: Re: Kubota Axle Thunk Reply to specific post Reply with quote


My experience as well as that of many others here has been that it is most likely to be an axle clamp sort of thing like Mike M said or looseness between the rim and center.
 
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PJH
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PostPosted: Fri Dec 22, 2017 3:35 pm    Post subject: Re: Kubota Axle Thunk Reply to specific post Reply with quote

Could it be a loose wheel weight? I've had that happen.
 
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Ragnarok
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PostPosted: Mon Dec 25, 2017 7:46 am    Post subject: Re: Kubota Axle Thunk Reply to specific post Reply with quote

CVPost-PJH wrote:
(quoted from post at 16:35:29 12/22/17) Could it be a loose wheel weight? I've had that happen.


My first thoughts as well..loose weights. Jack it up and check the rear wheel bearings for being loose(lift it off the ground and place your fingers on housing and axel at same time...let it down and feel for slack)

Could also be internal slack..depending on how it's constructed...slack in internal splines like stub-shafts or planet carrier/axel splines. The old JD 4010/4020 tractors are notorious for this...make a pop when taking off as the drive train winds-up the slack.
 
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Mnethercutt
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PostPosted: Wed Dec 27, 2017 2:45 pm    Post subject: Re: Kubota Axle Thunk Reply to specific post Reply with quote


This tractor doesn't have any wheel weights. I'll try jacking it up.
 
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