Hydraulic Question on 1969 Case 580CK TLB

Split my 69 Case 580CK for a new clutch and some other winter project chores, new distributor manifold etc. Pulled the loader frame and both tanks after dropping the hoe. I was hoping to fire up the tractor and move it before putting the loader tanks and frame on but do not want to damage the front mounted hydraulic pump running it with no fluid. So I was gonna mount the tanks only and run it if I can without the open hoses to the loader frame losing fluid everywhere.

1. If I install the loader frame side tanks (no loader) and hook up the suction side and pressure side of the system to the tanks as normal and leave the hoses that go to the lift cylinders unattached, will starting the tractor keep the system "closed" IF I DO NOT MOVE THE LOADER CONTROL HANDLE? Looks like the system would only allow fluid to get to the hoses IF the control is moved... do I have that right? I have a closed backhoe circuit I made years ago so the big line running to the hoe is unhooked from the hoe and connected with a kwik connect to loop back to the control. Does the fluid pass thru the control and ONLY get to the hanging open hoses IF I use the control handle for the loader?

Thanks for any info.

Loop the hoses,take one hose off from the machine and connect the end of the other to where it was,do that with with all the lines,do not start the engine if the quick break coupling is disconnected as that will cause the pump to dead end,the coupling must be snapped to gather when the hoe is off so the oil circulate around the system.
AJ

I have the hoe circuit looped so it is fine. I am wondering about the hoses for the loader. In looking at the control
it appears the tanks could possibly be hooked together with the crossover etc but with open cylinder hoses (they are
attached to the bucket frame still outside) and they would not lose fluid unless the control handle for the loader was
moved allowing those valves to be opened..... but I might have it wrong. I guess the question is does the fluid
circuit stay closed and pressured with open lift cylinder hoses as long as I don't activate those valves. The control
body look like it could flow thru. I just don't have an easy realistic way to loop the loader lift hoses all
together.