M Hydraulics

I have picked up an older (41) M that wasn't running. Got it running. PO had added power steering and a loader with live hyd.
I am having trouble understanding the hyd system. It is plumbed from the pump into two valves-actually through the first and into the second, which sit side by side down by operators right leg.
These two valves have long handles and seem to sit in a neutral setting, then can be moved either forward or backward? Then the line goes up to the loader controls. One of the valves were wired to hold it forward. Anyway I don't understand how these two valves need to be positioned to get fluid going in the right direction. Any coaching will be appreciated.
Took pictures but haven't figured the loading process out yet.
Thanks for any replies-Steve
 

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