Also how do I replace the bearing in these parts?
Large inter sprocket assembly (has some sort of pin in it). Do I just use pliers to yank it out?
and the bearing in the inter adjustment bracket assembly and small inter sprocket assembly
One easy way to remove the bearings is to block the hole in the other side of the bearing with a bolt
that is a snug fit ,preferably without the thread on the bolt ,if the bolt is under size (loose fit) then some
insulation tape can be used around the bolt until it fits the hole snug.
Then fill the bearing hole with grease and use a rod or bolt that is a snug fit in the bearing ,use insulation
tape if you are using an undersized bolt ( shaft) then hit the shaft with a hammer and when the bearing moves
put more grease in and hit the shaft in again.
The orange shaft to block the hole in the pic below would need to be facing the ground when attempting
the removal of the bearing to stop it from being dislodged.
The roll pin ,you could try removing it with long nose pliers avp ,if that doesn't work I would snap it off with a pin punch
and then use a round file if any bit of the pin is still sticking out.
Another way would be a slide hammer but you will need a big bench vice or a pilot bearing puller .
Cheers
Max.