Ok I found this video explaining 3 different types of hyd control valves. I dont quite get the float center type with check valves. Need to understand how the bucket can be stopped in any position and hold it, yet also float when for example plowing my driveway, but i will study it more later.
Cool vid tho, so sharing! 
https://youtu.be/CQPwvWXbV3w
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Model 100 Dec 2020 - Running condition, has snow plow!
Model 123 Nov 2020 Hydro needs much work, or resto, building front end loader for this one
Model 100 Feb 2019 apart for total frame-off / sandblast etc resto
Model 70 Sep 2020 needs total resto and an engine, or for parts
Model 70/100 Mar 2021 buried in rust, frozen engine, got free for parts.
two spare hydro rears
"in for a penny, in for a pound!"
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