Technical Manual 5th gear slip to neutral when throttle is engaged

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1.2l 8v GP Manual 5th gear slip to neutral when throttle is engaged

Hey,
1.2l 8v manual punto grande 2012.

My gear main shaft bearing was faulty so i replace it with a new one.
After assembly and cable linkage adjustment (upper cable=selector, is There a cable adjustment for the lower cable that isnt mentioned on elearn? ) 5th gear is slipping out to neutral. Doesn't happen immediately and i can see the shifter knob slowly going toward the neutral position.
When it does moving toward neutral i can remove my foot from the throttle and it sets back to 5th gear.
It's as if nothing is locking the gear in position.
I added photo of the 5th gear assembly and although its not brand new it looks ok.
Needless to say that Before the gear dismentaling the 5th gear worked perfectly.
I used elearn for the whole procedure.
Any suggestions What could have caused this problems/What have i done wrong?

 

[J4MALD1N]

Check for slack and proper adjustment of the linkage. It is possible that 5th gear isn’t being fully engaged so maybe the shift fork is out. On the other hand, there’s a good possibility that the synchronizer on 5th is worn out.

You will need to see a transmission specialist for this as gearbox repairs aren't exactly something you can do yourself unless you've the knowledge. With all the tight tolerances, it is easy to upset things if they're not where they should be