Shimano SPD m515 pedal.
Servicing the bearings, disassembly, clean, grease, reassemble.
If you are able to service the pedal, I mean if you have tools and some experience taking things apart and putting it all back together correctly or it might be better to just buy new pedals. I have 20,000 miles on this set of pedals and they still spin smoothly. The cleats are wearing out though. might be time for new pedals. Read more below.
To see the parts diagram follow the url here:
https://techdocs.shimano.com/media/techdocs/content/cycle/EV/actionsports/PD/EV-PD-M515-1858_v1_m56577569830608613.pdf
Youtube video or film that solves the problem of how to maintain your Shimano 105 spd pedals, hope this helps somebody.