Kubota kx61-3

[Mouse12]

Hi I have a Kx61-3 and the track is locking in forward and reverse. I cleaned everything around the cogs etc and its it still only moves an inch then locks same in re erse even when jacked up. to my untrsined ete its as if somthing is blockingthe movment.
Can anyone tell me what might be doing this?
I thought it might be the final drive but before I go down that route I thought Id ask the pros?
Im in the New Forest and wondered now much it might cost for an engineer to come out and fixi it. I can get the parts? Its o 3600 hrs.
Also should i replace both or wait fro the other to go if thats the issue?
thx
M

 

[Henro]

I don't have a link but there is a heavy equipment forum you can easily find that has lots of excavator owners participating.

You might google it and ask the same question there.

Now with my limited knowledge, having a smaller Kubota excavator, first thought is that either something is actually jamming up the track, or the primary drive for the track has failed.

The primary drive I believe is a hydraulic motor, so either you would have a hydraulic issue, or the drive motor that is right at the track, and on mine at the front of the track, may have failed.

Just a couple thoughts, from no expert by far.

Edit: Are your tracks tight? It could be possible that if they got loose enough, the motor could spin but the cogs would not engage the track properly, and spin rather than moving the track. BUT if this were the case you would almost certainly hear a clicking sound...

 

[GreensvilleJay]

hmm ONLY one track ? doubt it makes any real difference ,but if ONLY one, which one ?(might be plumbing ??).
If only one, I'd release tension on that side, remove track, test and see if final drive spins.

if the final drive is a 'planetary' reduction unit or bull gear style , you could have chipped a tooth off ,it's now stuck between 2 teeth and IT is what's jamming. Had that happen on my forklift. Could drive almost a full turn of the tire then JAM,go back SAME distance.
I'll look online for a 'parts diagram' to see ......

it looks like hydraulic motor spins #420 which drives 3 of #480 that then spin the 'hub 'J'. If anything gets between the internal teeth of hub 'J' , it'll stop you at 2 spots,repeatable. It all looks HEAVY to me ! Once you get access to it, removing 'J' will expose all the gears ,to look for a missing tooth(probably ' stuck inside 'J' in the valley between 2 teeth.
I'll leave now and let the experts chime in. the drawing's from a kx61-2 ....
Hopefully you can 'prep' by raising,blocking the machine, remove the track, CLEAN the area around the final, put a pot of coffee on............

 

[North Idaho Wolfman]

You'll need someone to pull the finals and check them for damage.

 

[Mouse12]

So heres a video, ive checked all around the teeth and i cant see anything blocked anywhere along the track or cog. Im wondering if its a broken tooth in the final drive? Again it moves forward an inch with force then locks up and the same in reverse? Does anyone know how difficult it is to get the track off, remove and replace a final drive or is it possible for a mechanic to do this work on sight? And if I go down a mechanics route should I do both. One more thing I forgot to mention I had been smelling a slight smell of burnt oil. The machine has done 3600 hrs. thx for all that messaged earlier.

 

[GreensvilleJay]

Using the drawing in post #3, I'd remove the screws #560 and pull the cover #530 out, carefully to not damage the oring #540. Probably remove screw #550 and $555 then insert bolt where $550 was ?
Once cover is removed, you should be able to see the 'final drive parts ...sun gear, planets and ring gear.
The 'cluster' of 3 gears and sun gear should come out as this is what everyone does to 'free wheel' the track to move a disabled excavator.
Obviously you can do this with track ON the ground....safety first !
1st step is to put a sheet of plywood and then a tarp under the track to make a nice clean work area.
2nd is to keep track of all the parts you remove. have a clean bucket and place them in it.
3rd once the planets are out, inspect for any broken teeth, check the internal teeth of the final
4th have a 2nd set of eyes look at the 'sun' gear and see if it moves when you slowly move that side fwd and rev.

The real Nice thing is looks like dry area to do the work !!!

 

[dirtydeed]

You sure have lots of slack in that track.

You can pop the track off by removing the cover located just to the right of your top center roller. There will be a grease fitting in there. Loosen the fitting. That will relieve the cylinder that adjusts the front idler (for track tension). You may have to pull the idler back towards the center of the track to get more slack in the track. You can use the hoe to do that. Grease will come out of that fitting.

There are lots of you tube videos on how to do this.

I'd pop that track off then try the final drive and go from there. It could be the final drive or maybe a frozen idler.

 

[North Idaho Wolfman]

So heres a video, ive checked all around the teeth and i cant see anything blocked anywhere along the track or cog. Im wondering if its a broken tooth in the final drive? Again it moves forward an inch with force then locks up and the same in reverse? Does anyone know how difficult it is to get the track off, remove and replace a final drive or is it possible for a mechanic to do this work on sight? And if I go down a mechanics route should I do both. One more thing I forgot to mention I had been smelling a slight smell of burnt oil. The machine has done 3600 hrs. thx for all that messaged earlier.

You posted a pic not a video, if you want us to see a video, post it on youtube, and give us a link to see it.

 

[North Idaho Wolfman]

Using the drawing in post #3, I'd remove the screws #560

That's not a screw, that a roll pin.

 

[GreensvilleJay]

yeah Kubota call them 'pin,spring ', easier to whack out,with proper drift , cheap to buy cause you'll lose 2 or 3 when working on grass or dirt !