Massey Ferguson 3080 lost 4th gear

[Maxxum ZE]

Ive got a MF 3080 autotronic that wont go into 4th gear, i fixed the issue with the nut at the front of the gearbox a few months ago and completly stripped out the gear box replaced a cog that had stripped teeth and put it all back together, A and B range aswell as 1,2,3 all work perfectly but whenever you try and put it in 4th it just grinds when you let the clutch out, ive taken the selector cover off and had a look inside i cant see anything wrong, anyone got any ideas or experience with this problem.
Cheers

 

[masseybreaker]

if you are lucky the fork is worn . but it could be the two top hat bearings that the gear runs on one has colapsed so the gear is running on a angle so the selector ring cant engage . hopefully not that because you will need a new gear and front shaft

 

[FIL46]

Worn fork or may have a slight bend in it, are the linkages from the gearstick to the box good or waliping about.

 

[Maxxum ZE]

How much play is there supposed to be with the fork inbetween the gap on the selector ring

 

[davedb]

How much play is there supposed to be with the fork inbetween the gap on the selector ring

As good as none should be a good fit

 

[Maxxum ZE]

As good as none should be a good fit

Can you replace the plastic bits on the ends or where can i get a new one or a decent one

 

[davedb]

No you’ll need a new one, try your local dealer for a price? Or @masseybreaker might have one

 

[Maxxum ZE]

Worn fork or may have a slight bend in it, are the linkages from the gearstick to the box good or waliping about.

Theres not a hell of a lot of play but it is a bit sloppy i tightened up the grub screw on the fork that comes out of the selector cover but where the fork goes over the synchro theres a decent bit of sloppyness but it seems that the selector ring goes all the way over so im confused why its grinding

 

[FIL46]

try selecting 4th gear with the tractor engine not running dip the clutch you may need to have someone push it or tow you a little if it goes in you may have a worn synchro ring.