Kubota Rear Inner Wheels Cracked

[charles todd]

Green wins again!

j/k... serious bummer. Would it appear that the stud failed first, and then the increased stresses on the remaining holes caused the cracking?

Troll

 

[LD1]

Troll

Sissy society where no one can take a light hearted joke anymore....SMH

 

[Bentrim]

Used to crack/break wheels on combines. Found these reinforcing rings fixed the problem. Welded them to the wheel used longer bolts -- end of problem.

6-Hole Wheel Reinforcing Ring

Front tractor & implement wheel 6-Hole Reinforcing Ring for sale online. 1106

www.millertire.com

 

[jayhawk238]

Sissy society where no one can take a light hearted joke anymore....SMH

You are so right. To many snowflakes whose feelings get hurt soooooooooo easy in today's America.

 

[Smokeydog]

Used to crack/break wheels on combines. Found these reinforcing rings fixed the problem. Welded them to the wheel used longer bolts -- end of problem.

6-Hole Wheel Reinforcing Ring

Front tractor & implement wheel 6-Hole Reinforcing Ring for sale online. 1106

www.millertire.com

Didn’t know you could buy the reinforcement rings. Makes the repair much easier if the bolt hole pattern matches.

 

[Hay Dude]

You are so right. To many snowflakes whose feelings get hurt soooooooooo easy in today's America.

Jayhawk238 where have you been, my man?
We need you to post more! Blessings and thanks for all you have done for our country!

 

[jayhawk238]

Jayhawk238 where have you been, my man?
We need you to post more! Blessings and thanks for all you have done for our country!

Just been busy as hell. Trying to get ready for winter and as normal I'm playing catch-up!!! As I'm typing this it's snowing!!

 

[MHarryE]

Used to crack/break wheels on combines. Found these reinforcing rings fixed the problem. Welded them to the wheel used longer bolts -- end of problem.

6-Hole Wheel Reinforcing Ring

Front tractor & implement wheel 6-Hole Reinforcing Ring for sale online. 1106

www.millertire.com

Nice find. Combine wheels carry a heavy load with a full grain bin. At Gleaner, we had always used cone type nuts centering the wheel - but they really create high contact stress in the cone area, begin to wallow out, which reduces torque. Retightening every day helps, until the wheel breaks. That’s what happened when a big grain bin size went from 80 bushel to 200, then higher. Field repair update was to weld a reinforcing ring like you found, reverse the nuts so cone side was out, torque, re-torque after 50 hours. Centering the wheel is really center hole to the axle flange. My trucks all have flat nuts on the studs as do my tractor wheels. I have plenty of implement wheels with standard ag lug bolt fasteners, the only wheels I still have problem wallowing out the holes.

 

[Hay Dude]

Is this why they went from stud pilot to hub pilot wheels on trucks?

 

[Smokeydog]

Kubota M59 uses flat nuts and thick washers with a pilot hub on front axle. Just repaired a tire. 8 lug.

 

[BravoXray]

Is this why they went from stud pilot to hub pilot wheels on trucks?

I believe that was one reason, the Budd type fastening system was notorious for breaking wheels and the nonsense of using 10 inner and 10 outer nuts on each dual wheel, and left and right handed threaded fasteners on their respective sides on some vehicles, though after the 70s most all were right hand thread, at least on the Petes I owned.
The Pilot type was used in Europe long before it was adopted here, and has greatly extended the fatigue life of wheels and halved the fastener count on each wheel.
The washer type nuts on Pilot wheels exert only a clamping force on the wheels, while the Budd nuts were ball shaped and thus exerted a lot of stretching force on the area around the nuts, as was shown by frequent cracking around the holes.

 

[SPYDERLK]

I have 2007 L3240HST which I always have a backhoe and front loader attached.
The dealer set up the tractor with fluid in rear tires and chains.

For the 2nd time, my rear inner wheels have developed cracks around the lug nuts towards the inner hub.
I check the torque often and always correct.
760 hours on the tractor.

A couple observations.
1. Kubota does not chamfer the sharp edges on the inner wheels. Sharp Edges are stress risers.
2. The wheel lugs are not self centering. The clearance on the bolts and studs will allow slippage.
One of the studs has sheared off. I have seen this on an M series tractor as well.

Are there others with this issue?

I have Kub Ls in that size range and have not had any issues, but no B/H. I recall though a prior conversation here where a cracking problem presented. There was some talk of lug torques and they were surprisingly low for 16mm bolts. I went out then and removed one of mine and slapped it back down to "stall" with the impact wrench on low. Then with a torque wrench I found the torque applied was 250ftlb. That is an overtorque, but no damage. I recommend that you remove those lock washers and replace them with Grade 8 flatwashers available at TSC. I would tighten the lugs to at least 200ftlb.

 

[Smokeydog]

I have 2007 L3240HST which I always have a backhoe and front loader attached.
The dealer set up the tractor with fluid in rear tires and chains.

For the 2nd time, my rear inner wheels have developed cracks around the lug nuts towards the inner hub.
I check the torque often and always correct.
760 hours on the tractor.

A couple observations.
1. Kubota does not chamfer the sharp edges on the inner wheels. Sharp Edges are stress risers.
2. The wheel lugs are not self centering. The clearance on the bolts and studs will allow slippage.
One of the studs has sheared off. I have seen this on an M series tractor as well.

Are there others with this issue?

Curious, what is the thickness of the disk at the hub?