Gear Change Stuck

Hi,
had sometimes a problem : sometimes gear box remained stuck 1st gear, impossible to move it to 2nd gear for a few seconds or minutes...had to stop & wait a bit before being able to move it...so, had the idea to spray grease in the pedal linkage mechanisms. now, no more sticking episodes & gear change really smoother...

 

...yep...I should disassemble all this stuff , clean everything & put it back in place with new seals & fresh grease, but it's working fine now, so I prefer to do it later....maube when the clutch will need replacement