I suppose it's possible for the pin (43)to rust to the bore, however, there's a lip "wiper seal" at the outside to keep moisture and debris out, and an O-ring to keep oil in.
It's also possible that the rod and linkage connected to the pin is bent or broken.
There was some issue, I don't remember exactly what, where the mechanism would get bent, IIRC, chain (#56) is involved in trying to prevent that. (Issue may have been if left arms were externally lifted/forced beyond normal travel.)
I have a "424", which used the same lift setup, IIRC you can see the mechanism after removing the 4-bolt cover under the seat.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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