Kubota M5-111 will not go into 5th and 6th gear

[snoworks]

Howdy folks,

As the title says, this machine will not go into 5th and 6th gear; all the other gears work ok, although the gear shift level feels a bit stiffer than usual. It has 2000hrs on it and is the HDDC 24 speed.
High/Low works well, just thought I would see if this was a common problem before I start taking things apart. I did a quick search too..

Thank you for any advice!

 

[North Idaho Wolfman]

I would start here and make sure there is no debris built up around it.

Then check the linkage.

Pretty much anything else is going to be internal.