Kubota B7100D gear shifting in high RPM?

[torch]

You are welcome. I think we figured out the mystery of why you couldn't download it originally. Hopefully the fix for the tractor will be forthcoming. ;-)

 

[Aris]

First please don't type in all CAPS as that is considered yelling and rude.

The RPMs and the gears grinding are and are not related.
You probably just don't notice it at lower RPM's because it's less violent and has less force.
If you can get it in gear and it stays in gear and moves fine when in gear it's not a transmission issue.
It is a clutch adjustment issue, the clutch is dragging and at high RPM's it's trying to spin the transmission and at lower RPMS it's less force thus less noticeable.

Now for the High RPM's.
Three most likely causes:

Bad or worn injectors, as they heat up the springs get week and they push more fuel easier.
New injectors would not be a bad starting point, it's certainly not going to hurt it.

Damaged or worn injection pump, either get a new pump or have yours rebuilt.
It's not a rack issue because you can start and stop the tractor normally, if the rack was stickling it wouldn't shut down or start properly.
It's not something you're going to be able to do without the proper tolerance measuring and test equipment.

The last cause is the governor might be damaged, and let me stress this that is very very rare on a Kubota, they just don't fail.
The governor is not a simple spring to be removed, it's much more complicated than that, and to get to it it's requires removing the whole front of the engine.

With you being all the way over in Greece, help all of us help you out, make a video of it doing what it's doing, 2 part, cold operation and warm operation, show the throttle linkage being moved (at the motor side) in both cold and warm.
Post the video on You Tube and then give us a link to see it.
I've done this before it helps tremendously.

OK, I’m back from the island with some videos that hopefully will help! I hope the upload is made right it’s my first one!

Videos were taken in the garage where it is mothballed for winter

The first is with the engine just started cold (60f) and I can shift, with no grinding. The RPM is in idle but even here it seems to me high but I have no way of knowing. Here it is :

This second is with the engine warmed to 132f but not to the thermostat temp (sorry, I had to catch the ferry back home). The gearbox has the ambient temp at (60f). The RPM has increased and I can shift into gears, but you can hear the grinding. I want to stress here that when operating on the filed on a summer day with engine and gearbox fully warmed up, the RPM goes WAY much higher and if I try to shift into gear, it grinds like crazy and the gear refuses to go in. I have resolved to stop the engine, shift into the gear I want and restart the engine to proceed. Here it is;

Here is the throttle linkage that seems ok to me, and at the engine end it is all the way backed up to lowest adjustment. Here it is ;

Here is a demo of the clutch linkage where it engages halfway on the travel as you can see when tractor moves. Here it is ;

 

[torch]

Ok, first thing I notice is that the "grinding" sound does not start until you release the clutch. That is not what I had envisioned -- I thought you meant it was grinding while the clutch was depressed, which is a completely different problem. I suspect others thought that too.

Second thing I notice is that the linkage is not returning normally when you pull the throttle back all the way. You had to reach under and pull the linkage back by hand.

 

[torch]

Does this tractor have an accelerator pedal as well as a lever? Small pedal to the right of the brake pedals? At the very start of your first (cold) video, it looks like your foot pushes down on a pedal slightly and the engine revs slightly. If there is a pedal there, it should also have a spring to hold the linkage up. But your linkage snaps back to a running position after you kill the engine in the 3rd video.

Maybe that foot throttle linkage return spring is broken or incorrectly installed?

What happens if you (or a helper) holds the linkage back manually? Not all the way so the tractor dies, but part way back. Does the engine idle at a lower RPM?

 

[North Idaho Wolfman]

Thanks for the videos that helps a lot!

There is a broken / miss adjusted spring on the the throttle linkage.
Either foot and / or hand linkage.

The noise is the throw-out bearing, The clutch is worn out, I can tell from the excessive travel for it to disengage and engage.