1st gear issues

[LR5V]

So I managed to change the gear linkage and it was working perfect until I drove it for about 20 minutes and it just wouldn't go into first gear. Will try the alignment next and see what happens. Any others ideas will be helpful!

Suspect you have not tightened the clamp bolt enough on the rod, fine for a while but worked loose... It really needs to be tight as a tiger!

[ImIMK3]

I put some gear box fluid in now which seems to have helped. Will put some more in tomorrow as I only got a litre in there and it takes 2 litres.