|
Repair of a universal joint yoke - possible?
One of the UJT yokes on our Kubota tractor has failed, one of the
'arms' is broken so no longer retains the needle roller bearing. Is there any sane way of repairing this as replacements seem nearly impossible to find. It's a bit of a strange design as the yoke goes direct onto a flanged shaft (i.e. it has an internal spline) so finding a non-Kubota replacement is unlikely. However if anyone can recommend suppliers of (small) UJTs with splined connections I'd be interested. -- Chris Green · |
Repair of a universal joint yoke - possible?
On 07/10/2018 15:42, Chris Green wrote:
One of the UJT yokes on our Kubota tractor has failed, one of the 'arms' is broken so no longer retains the needle roller bearing. Is there any sane way of repairing this as replacements seem nearly impossible to find. It's a bit of a strange design as the yoke goes direct onto a flanged shaft (i.e. it has an internal spline) so finding a non-Kubota replacement is unlikely. However if anyone can recommend suppliers of (small) UJTs with splined connections I'd be interested. Possibly cast iron? When you say broken, do you mean a brittle fracture or something else? Photo? Cast iron can certainly be TIG welded with the right rod and some skill. I'm not sure if it can be silver soldered. Maybe SG can be, not sure about grey. Google is ambiguous. If it were mine (and not having TIG) I'd probably try silver soldering. Obviously, you might need to bore out and sleeve the bearing housing afterwards, or perhaps see if a bigger bearing can be fitted. Failing that, might it be possible to cut off the splines and graft them on to something else? |
Repair of a universal joint yoke - possible?
On Sunday, 7 October 2018 15:48:04 UTC+1, Chris Green wrote:
One of the UJT yokes on our Kubota tractor has failed, one of the 'arms' is broken so no longer retains the needle roller bearing. Is there any sane way of repairing this as replacements seem nearly impossible to find. It's a bit of a strange design as the yoke goes direct onto a flanged shaft (i.e. it has an internal spline) so finding a non-Kubota replacement is unlikely. However if anyone can recommend suppliers of (small) UJTs with splined connections I'd be interested. whatever you do don't give us enough information |
Repair of a universal joint yoke - possible?
On Sunday, 7 October 2018 15:48:04 UTC+1, Chris Green wrote:
One of the UJT yokes on our Kubota tractor has failed, one of the 'arms' is broken so no longer retains the needle roller bearing. Is there any sane way of repairing this as replacements seem nearly impossible to find. It's a bit of a strange design as the yoke goes direct onto a flanged shaft (i.e. it has an internal spline) so finding a non-Kubota replacement is unlikely. However if anyone can recommend suppliers of (small) UJTs with splined connections I'd be interested. -- Chris Green · It will be forged. Probably duff post heat treatment. It will be a hard one to fix/weld. The reason for the splined shaft is that UJs do not rotate at constant speed when out of line and axial movement comes in. The spline allows for this.. I should concentrate on getting a replacement part. |
Repair of a universal joint yoke - possible?
On 07/10/2018 18:21, harry wrote:
On Sunday, 7 October 2018 15:48:04 UTC+1, Chris Green wrote: One of the UJT yokes on our Kubota tractor has failed, one of the 'arms' is broken so no longer retains the needle roller bearing. Is there any sane way of repairing this as replacements seem nearly impossible to find. It's a bit of a strange design as the yoke goes direct onto a flanged shaft (i.e. it has an internal spline) so finding a non-Kubota replacement is unlikely. However if anyone can recommend suppliers of (small) UJTs with splined connections I'd be interested. -- Chris Green · It will be forged. Probably duff post heat treatment. On reflection I'm sure you are right about forging. But also on reflection isn't it more likely to be a metallurgical defect than heat treatment? That's why a photo would be interesting. It will be a hard one to fix/weld. Indeed (but we like them, don't we). The reason for the splined shaft is that UJs do not rotate at constant speed when out of line and axial movement comes in. The spline allows for this. although you only need one on the "intermediate" bit. I should concentrate on getting a replacement part. I certainly would not ignore that possibility. It's not as if it is a rare machine. You might actually find that parts from Chinese or Eastern European copies fit. |
Repair of a universal joint yoke - possible?
newshound wrote:
On 07/10/2018 15:42, Chris Green wrote: One of the UJT yokes on our Kubota tractor has failed, one of the 'arms' is broken so no longer retains the needle roller bearing. Is there any sane way of repairing this as replacements seem nearly impossible to find. It's a bit of a strange design as the yoke goes direct onto a flanged shaft (i.e. it has an internal spline) so finding a non-Kubota replacement is unlikely. However if anyone can recommend suppliers of (small) UJTs with splined connections I'd be interested. Possibly cast iron? Possibly, yes. It certainly looks like a casting of some sort. When you say broken, do you mean a brittle fracture or something else? More of a 'worn away until the bearing ripped out', looking at the remains I think it may not be cast iron as it has torn rather than cracked. Photo? Good idea...... Here you go:- http:/isbd.net/yoke/p1020500.jpg Cast iron can certainly be TIG welded with the right rod and some skill. I'm not sure if it can be silver soldered. Maybe SG can be, not sure about grey. Google is ambiguous. I don't have a TIG, only MIG and a little inverter stick welder. If it were mine (and not having TIG) I'd probably try silver soldering. Obviously, you might need to bore out and sleeve the bearing housing afterwards, or perhaps see if a bigger bearing can be fitted. Failing that, might it be possible to cut off the splines and graft them on to something else? Yes, ultimately grafting on to something else *might* be the way to go. It's one end of:- spline-UJT-sliding spline-UJT-spline -- Chris Green · |
Repair of a universal joint yoke - possible?
Chris Green wrote:
newshound wrote: On 07/10/2018 15:42, Chris Green wrote: One of the UJT yokes on our Kubota tractor has failed, one of the 'arms' is broken so no longer retains the needle roller bearing. Is there any sane way of repairing this as replacements seem nearly impossible to find. It's a bit of a strange design as the yoke goes direct onto a flanged shaft (i.e. it has an internal spline) so finding a non-Kubota replacement is unlikely. However if anyone can recommend suppliers of (small) UJTs with splined connections I'd be interested. Possibly cast iron? Possibly, yes. It certainly looks like a casting of some sort. When you say broken, do you mean a brittle fracture or something else? More of a 'worn away until the bearing ripped out', looking at the remains I think it may not be cast iron as it has torn rather than cracked. Photo? Good idea...... Here you go:- http:/isbd.net/yoke/p1020500.jpg Nope. Doesnt work... Tim -- Please don't feed the trolls |
Repair of a universal joint yoke - possible?
newshound wrote:
On 07/10/2018 18:21, harry wrote: On Sunday, 7 October 2018 15:48:04 UTC+1, Chris Green wrote: One of the UJT yokes on our Kubota tractor has failed, one of the 'arms' is broken so no longer retains the needle roller bearing. Is there any sane way of repairing this as replacements seem nearly impossible to find. It's a bit of a strange design as the yoke goes direct onto a flanged shaft (i.e. it has an internal spline) so finding a non-Kubota replacement is unlikely. However if anyone can recommend suppliers of (small) UJTs with splined connections I'd be interested. -- Chris Green · It will be forged. Probably duff post heat treatment. No fault, just worn away by long use. On reflection I'm sure you are right about forging. But also on reflection isn't it more likely to be a metallurgical defect than heat treatment? That's why a photo would be interesting. It will be a hard one to fix/weld. Indeed (but we like them, don't we). The reason for the splined shaft is that UJs do not rotate at constant speed when out of line and axial movement comes in. The spline allows for this. although you only need one on the "intermediate" bit. Yes, this is one of the 'ends' where it couples on to the driven shaft, it's not a sliding joint. The sliding joint is in the middle between this UJT and another. I should concentrate on getting a replacement part. I certainly would not ignore that possibility. It's not as if it is a rare machine. You might actually find that parts from Chinese or Eastern European copies fit. I've looked for parts for this before and found the needle rollers for the UJT but so far haven't found the yokes. -- Chris Green · |
Repair of a universal joint yoke - possible?
Tim+ wrote:
Chris Green wrote: newshound wrote: On 07/10/2018 15:42, Chris Green wrote: One of the UJT yokes on our Kubota tractor has failed, one of the 'arms' is broken so no longer retains the needle roller bearing. Is there any sane way of repairing this as replacements seem nearly impossible to find. It's a bit of a strange design as the yoke goes direct onto a flanged shaft (i.e. it has an internal spline) so finding a non-Kubota replacement is unlikely. However if anyone can recommend suppliers of (small) UJTs with splined connections I'd be interested. Possibly cast iron? Possibly, yes. It certainly looks like a casting of some sort. When you say broken, do you mean a brittle fracture or something else? More of a 'worn away until the bearing ripped out', looking at the remains I think it may not be cast iron as it has torn rather than cracked. Photo? Good idea...... Here you go:- http:/isbd.net/yoke/p1020500.jpg Nope. Doesnt work... Oops, sorry, should be:- http://isbd.uk/yoke/p1020500.jpg -- Chris Green · |
Repair of a universal joint yoke - possible?
On 07/10/2018 15:42, Chris Green wrote:
One of the UJT yokes on our Kubota tractor has failed, one of the 'arms' is broken so no longer retains the needle roller bearing. Is there any sane way of repairing this as replacements seem nearly impossible to find. It's a bit of a strange design as the yoke goes direct onto a flanged shaft (i.e. it has an internal spline) so finding a non-Kubota replacement is unlikely. However if anyone can recommend suppliers of (small) UJTs with splined connections I'd be interested. What model is the tractor? Would a different yoke fit from another Kubota item fit? For instance I've seen yokes for rotary tillers that are internally splined, but where yours seems to have a hole (for a locking bolt?) they have a clamp. I know nothing at all about these, just the result of a quick google. SteveW |
Repair of a universal joint yoke - possible?
On 07/10/2018 22:25, Chris Green wrote:
Tim+ wrote: Chris Green wrote: newshound wrote: On 07/10/2018 15:42, Chris Green wrote: One of the UJT yokes on our Kubota tractor has failed, one of the 'arms' is broken so no longer retains the needle roller bearing. Is there any sane way of repairing this as replacements seem nearly impossible to find. It's a bit of a strange design as the yoke goes direct onto a flanged shaft (i.e. it has an internal spline) so finding a non-Kubota replacement is unlikely. However if anyone can recommend suppliers of (small) UJTs with splined connections I'd be interested. Possibly cast iron? Possibly, yes. It certainly looks like a casting of some sort. When you say broken, do you mean a brittle fracture or something else? More of a 'worn away until the bearing ripped out', looking at the remains I think it may not be cast iron as it has torn rather than cracked. Photo? Good idea...... Here you go:- http:/isbd.net/yoke/p1020500.jpg Nope. Doesnt work... Oops, sorry, should be:- http://isbd.uk/yoke/p1020500.jpg Thanks, that works for me! OK so the needle roller bearing has been gone for a long time, that looks fairly irrecoverable. I'm not really familiar with Kubota tractors. UJ spares for their mowers look pretty expensive on eBay. This is obviously on a drive shaft, rather than steering. Less scope to bodge a drive shaft, I'd have said. If there are really no spares around then I still think I would be looking to adapt something from another mini-tractor. You might also look at ATVs. Looks a bit like this, though https://www.ebay.co.uk/itm/Kubota-Dr...AOSw4GVYKuK l |
Repair of a universal joint yoke - possible?
On 07/10/2018 20:47, Chris Green wrote:
newshound wrote: I should concentrate on getting a replacement part. I certainly would not ignore that possibility. It's not as if it is a rare machine. You might actually find that parts from Chinese or Eastern European copies fit. I've looked for parts for this before and found the needle rollers for the UJT but so far haven't found the yokes. It's usually considered good practice to replace the spider and bearings a bit sooner :-) |
Repair of a universal joint yoke - possible?
Chris Green Wrote in message:
One of the UJT yokes on our Kubota tractor has failed, one of the 'arms' is broken so no longer retains the needle roller bearing. Is there any sane way of repairing this as replacements seem nearly impossible to find. It's a bit of a strange design as the yoke goes direct onto a flanged shaft (i.e. it has an internal spline) so finding a non-Kubota replacement is unlikely. However if anyone can recommend suppliers of (small) UJTs with splined connections I'd be interested. Ooi what model? -- -- Jim K ----Android NewsGroup Reader---- http://usenet.sinaapp.com/ |
Repair of a universal joint yoke - possible?
In message , Chris Green
writes Tim+ wrote: Chris Green wrote: newshound wrote: On 07/10/2018 15:42, Chris Green wrote: One of the UJT yokes on our Kubota tractor has failed, one of the 'arms' is broken so no longer retains the needle roller bearing. Is there any sane way of repairing this as replacements seem nearly impossible to find. It's a bit of a strange design as the yoke goes direct onto a flanged shaft (i.e. it has an internal spline) so finding a non-Kubota replacement is unlikely. However if anyone can recommend suppliers of (small) UJTs with splined connections I'd be interested. Possibly cast iron? Possibly, yes. It certainly looks like a casting of some sort. When you say broken, do you mean a brittle fracture or something else? More of a 'worn away until the bearing ripped out', looking at the remains I think it may not be cast iron as it has torn rather than cracked. Photo? Good idea...... Here you go:- http:/isbd.net/yoke/p1020500.jpg Nope. Doesnt work... Oops, sorry, should be:- http://isbd.uk/yoke/p1020500.jpg Long time since I have had any Kubota tackle but George Browns at Leighton Buzzard were always helpful. -- Tim Lamb |
Repair of a universal joint yoke - possible?
On 07/10/18 22:25, Chris Green wrote:
Tim+ wrote: Chris Green wrote: newshound wrote: On 07/10/2018 15:42, Chris Green wrote: One of the UJT yokes on our Kubota tractor has failed, one of the 'arms' is broken so no longer retains the needle roller bearing. Is there any sane way of repairing this as replacements seem nearly impossible to find. It's a bit of a strange design as the yoke goes direct onto a flanged shaft (i.e. it has an internal spline) so finding a non-Kubota replacement is unlikely. However if anyone can recommend suppliers of (small) UJTs with splined connections I'd be interested. Possibly cast iron? Possibly, yes. It certainly looks like a casting of some sort. When you say broken, do you mean a brittle fracture or something else? More of a 'worn away until the bearing ripped out', looking at the remains I think it may not be cast iron as it has torn rather than cracked. Photo? Good idea...... Here you go:- http:/isbd.net/yoke/p1020500.jpg Nope. Doesnt work... Oops, sorry, should be:- http://isbd.uk/yoke/p1020500.jpg Ah. Yes that is well copulated. hard thing to make - forged Id say. Maybe a blacsmisth could do it, but Id definitely say you need to get a new yoke that fits the UJ and somehow attach it to the splined bit Maybe make a sleeve that fits over both and drill and pin it. -- Religion is regarded by the common people as true, by the wise as foolish, and by the rulers as useful. (Seneca the Younger, 65 AD) |
Repair of a universal joint yoke - possible?
On Sun, 07 Oct 2018 22:25:34 +0100, Chris Green wrote:
Tim+ wrote: Chris Green wrote: newshound wrote: On 07/10/2018 15:42, Chris Green wrote: One of the UJT yokes on our Kubota tractor has failed, one of the 'arms' is broken so no longer retains the needle roller bearing. Having seen the photo it may be possible to modify a PTO yoke to replace it if the Kubota part is not available. This site: http://www.amacoo.com/transmission-p...6-walterscheid Shows some yokes with dimensions. AJH |
Repair of a universal joint yoke - possible?
newshound wrote:
On 07/10/2018 22:25, Chris Green wrote: Tim+ wrote: Chris Green wrote: newshound wrote: On 07/10/2018 15:42, Chris Green wrote: One of the UJT yokes on our Kubota tractor has failed, one of the 'arms' is broken so no longer retains the needle roller bearing. Is there any sane way of repairing this as replacements seem nearly impossible to find. It's a bit of a strange design as the yoke goes direct onto a flanged shaft (i.e. it has an internal spline) so finding a non-Kubota replacement is unlikely. However if anyone can recommend suppliers of (small) UJTs with splined connections I'd be interested. Possibly cast iron? Possibly, yes. It certainly looks like a casting of some sort. When you say broken, do you mean a brittle fracture or something else? More of a 'worn away until the bearing ripped out', looking at the remains I think it may not be cast iron as it has torn rather than cracked. Photo? Good idea...... Here you go:- http:/isbd.net/yoke/p1020500.jpg Nope. Doesnt work... Oops, sorry, should be:- http://isbd.uk/yoke/p1020500.jpg Thanks, that works for me! OK so the needle roller bearing has been gone for a long time, that looks fairly irrecoverable. It hasn't been gone long, it is somewhat vulnerable because it's quite low down in front of the mower deck so does get hit by sticks and stones. In this case I was mowing, there was a bang, and I wasn't mowing. I'm not really familiar with Kubota tractors. UJ spares for their mowers look pretty expensive on eBay. They're expensive everywhere and seem to be subject to some sort of price fixing/control. Firstly US suppliers refuse to send overseas (even when they will send other stuff overseas) and US prices are much lower. Secondly if you look at a list of prices or quite varied small parts they are all the same (exorbitant) price within a few pence regardless of what they are. There are a few 'normally replaceable' items like filters which are cheaper but otherwise everything is $95 to $98. This is obviously on a drive shaft, rather than steering. Less scope to bodge a drive shaft, I'd have said. Yes, it's the drive from the PTO to the mower deck. If there are really no spares around then I still think I would be looking to adapt something from another mini-tractor. You might also look at ATVs. Yes. Looks a bit like this, though https://www.ebay.co.uk/itm/Kubota-Dr...AOSw4GVYKuK l That's much longer and is the middle, sliding bit, my broken bit is on the other half of a much shorter one. -- Chris Green · |
Repair of a universal joint yoke - possible?
AJH wrote:
On Sun, 07 Oct 2018 22:25:34 +0100, Chris Green wrote: Tim+ wrote: Chris Green wrote: newshound wrote: On 07/10/2018 15:42, Chris Green wrote: One of the UJT yokes on our Kubota tractor has failed, one of the 'arms' is broken so no longer retains the needle roller bearing. Having seen the photo it may be possible to modify a PTO yoke to replace it if the Kubota part is not available. This site: http://www.amacoo.com/transmission-p...6-walterscheid Shows some yokes with dimensions. I've bought from them before, very reasonable prices for UJT needle bearings compared with just about everywhere else. However they don't seem to have anything small enough in the way of yokes. I'll bear in mind adapting something they have though. -- Chris Green · |
Repair of a universal joint yoke - possible?
Jim K wrote:
Chris Green Wrote in message: One of the UJT yokes on our Kubota tractor has failed, one of the 'arms' is broken so no longer retains the needle roller bearing. Is there any sane way of repairing this as replacements seem nearly impossible to find. It's a bit of a strange design as the yoke goes direct onto a flanged shaft (i.e. it has an internal spline) so finding a non-Kubota replacement is unlikely. However if anyone can recommend suppliers of (small) UJTs with splined connections I'd be interested. Ooi what model? T1600H with a 44" deck, the joint is part of the deck drive. -- Chris Green · |
Repair of a universal joint yoke - possible?
On 08/10/2018 13:07, Chris Green wrote:
newshound wrote: Looks a bit like this, though https://www.ebay.co.uk/itm/Kubota-Dr...AOSw4GVYKuK l That's much longer and is the middle, sliding bit, my broken bit is on the other half of a much shorter one. But I wondered whether one of the yokes might be the same |
Repair of a universal joint yoke - possible?
newshound wrote:
On 08/10/2018 13:07, Chris Green wrote: newshound wrote: Looks a bit like this, though https://www.ebay.co.uk/itm/Kubota-Dr...AOSw4GVYKuK l That's much longer and is the middle, sliding bit, my broken bit is on the other half of a much shorter one. But I wondered whether one of the yokes might be the same I suspect it's quite a lot bigger (in diameter as well) because it is (I think) a tractor prop shaft. -- Chris Green · |
Repair of a universal joint yoke - possible?
"Chris Green" wrote in message ... newshound wrote: On 07/10/2018 22:25, Chris Green wrote: Tim+ wrote: Chris Green wrote: newshound wrote: On 07/10/2018 15:42, Chris Green wrote: One of the UJT yokes on our Kubota tractor has failed, one of the 'arms' is broken so no longer retains the needle roller bearing. Is there any sane way of repairing this as replacements seem nearly impossible to find. It's a bit of a strange design as the yoke goes direct onto a flanged shaft (i.e. it has an internal spline) so finding a non-Kubota replacement is unlikely. However if anyone can recommend suppliers of (small) UJTs with splined connections I'd be interested. Possibly cast iron? Possibly, yes. It certainly looks like a casting of some sort. When you say broken, do you mean a brittle fracture or something else? More of a 'worn away until the bearing ripped out', looking at the remains I think it may not be cast iron as it has torn rather than cracked. Photo? Good idea...... Here you go:- http:/isbd.net/yoke/p1020500.jpg Nope. Doesnt work... Oops, sorry, should be:- http://isbd.uk/yoke/p1020500.jpg Thanks, that works for me! OK so the needle roller bearing has been gone for a long time, that looks fairly irrecoverable. It hasn't been gone long, it is somewhat vulnerable because it's quite low down in front of the mower deck so does get hit by sticks and stones. In this case I was mowing, there was a bang, and I wasn't mowing. I'm not really familiar with Kubota tractors. UJ spares for their mowers look pretty expensive on eBay. They're expensive everywhere and seem to be subject to some sort of price fixing/control. Firstly US suppliers refuse to send overseas (even when they will send other stuff overseas) and US prices are much lower. There are operations that allow you to use a US address to have stuff shipped to which will then send it anywhere you like. Secondly if you look at a list of prices or quite varied small parts they are all the same (exorbitant) price within a few pence regardless of what they are. There are a few 'normally replaceable' items like filters which are cheaper but otherwise everything is $95 to $98. This is obviously on a drive shaft, rather than steering. Less scope to bodge a drive shaft, I'd have said. Yes, it's the drive from the PTO to the mower deck. If there are really no spares around then I still think I would be looking to adapt something from another mini-tractor. You might also look at ATVs. Yes. Looks a bit like this, though https://www.ebay.co.uk/itm/Kubota-Dr...AOSw4GVYKuK l That's much longer and is the middle, sliding bit, my broken bit is on the other half of a much shorter one. -- Chris Green · |
Repair of a universal joint yoke - possible?
On Mon, 08 Oct 2018 13:34:58 +0100, Chris Green wrote:
I've bought from them before, very reasonable prices for UJT needle bearings compared with just about everywhere else. However they don't seem to have anything small enough in the way of yokes. I'll bear in mind adapting something they have though. I think it was worth running a bead with a MIG over the yoke and seeing how it files across the parent metal. If it goes well and is machineable build it up, squeeze the ends parallel and get it line bored. AJH |
| All times are GMT +1. The time now is 02:15 PM. |
Powered by vBulletin® Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Copyright ©2004 - 2014 DIYbanter