question Old bucket seat from Zetor

[moliner]

Hello fellow Zetor friends
I'm renovating the old bucket seat on my 3511. The tractor stood still in a barn for about 25 years, and the whole seat foundation/frame is rusted solid. Nothing is moving .
So I'm dismantling everything, and (after sanding and painting) It will hopefully be good again.
When taking out the pins/bolts holding the moving frame parts together, I noticed there are some kind of shim between the pin and the hole.

What is it called, and what is the purpose of this?

Found this video on the tube where this guy is doing the same job, but I don't speak the language....

View: https://www.youtube.com/watch?v=HK8cjQyFxsI&t=1068s
From about 17:40 into the movie, you can see he starts to prepare these shims.

 

[thoragn]

I just assembled and install the seat on my '71 3511. It was totally frozen with rust, took a lot of beating and finally a 20 ton press to push out the pins. All shims and fasteners ruined. The original bushing material looked like brass net with graphite. It is approx. 0.5mm thick. I replaced it with what I had at hand, brass tubing from a sink Drilled out the pins and added grease nipples, put everything in position and fixed the pins by 6mm bolts and small fins welded to the end of the pins. Not pretty but will surely outlast me

 

[moliner]

I just assembled and install the seat on my '71 3511. It was totally frozen with rust, took a lot of beating and finally a 20 ton press to push out the pins. All shims and fasteners ruined. The original bushing material looked like brass net with graphite. It is approx. 0.5mm thick. I replaced it with what I had at hand, brass tubing from a sink Drilled out the pins and added grease nipples, put everything in position and fixed the pins by 6mm bolts and small fins welded to the end of the pins. Not pretty but will surely outlast me

Thanks Thor,
those pins are really difficult to get out, for sure. I have 2 left now, and I will try with a press (like you did).
So you drilled a hole into the pins, and then a hole on the side (for the grease to come out)? Great idea!
Looks like you replaced the nylon washers with metal ones?

 

[Joachim]

When taking out the pins/bolts holding the moving frame parts together, I noticed there are some kind of shim between the pin and the hole.

What is it called, and what is the purpose of this?

I Think its something like graphite sliding fabric/graphite covering like this here:

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Realy good video too.