That is quite a collection.I'm currently cleaning up and fixing my newly bought old 643. Disassembled the diesel and hydraulic tanks yesterday. This is what I found in my diesel tank ;-) Lots of small pieces of old hoses and both screen filters were rattling around lose at the bottom. My motor did not stall or show any odd symptoms (checked compression) but the lift and tilt seems weak so I took the decision to refurbish as much as possible including repacking all cylinders. Maybe half way through this work by now...