Needed hydraulic expert

I have old tractor with a loader. Can't find a name on loader valve but ports are marked In,Out,and Bypass. The Bypas is plugged. It shows 1000 PSI all the time. loader and bucket work ok. Took out the bypass
plug and found a spool and removed it. Now only pressure when I move valve levers but the bucket is only one way now. If I put spool back in and run a line from bypas to tank will it work right.

Im not an expert but it sounds like it is plumbed for closed center and you need open center. Running the bypass back to the tank sould fix it.

Sounds like a case of if it isn't broken don't fix it. Put ti back the way it was if it was working and be done with it

If I leave it as is then that's a full time load on the engine. It will use more fuel and wear out faster.

Could you take a couple of good pictures to post on here?

Maybe yes and maybe no. If it was set up that way then is has to be that way or you will not have pressure

If it aint broke dont fix it. I'm not sure you can change from an open center system to a closed center one by just changing the loader control valve.

I don't have an original set up. I taking two incomplete tractors and putting them togather to make one complete tractor.

Not good at pictures but I'll try

In that case you need to let us know what your working on. Some tractors use close center hyds and others open and the 2 don't mix well

May not help but here is one I can't get the back side picture to load pictures

second try for second picture

More info... old tractor, what make and model?..is the loader running off its own pump or hooked into the tractors hydraulics? If connecting a bypass does not fix it may be that you have some valve connections wrong, in fact I think you may have a closed center valve and your system is open center. Closed center configuration is not common on the majority of basic hydraulic systems.

as stated earlier the make of tractor would help and which pump is supplying your loader i.e. pump for tractor remotes, lift pump with a diverter valve, external pto pump ect. the info above will help determine if you have an open center system , I could be wrong but from information you given someone has used a close center valve on an open center system, as you said it will load the engine and cause the pump relief valve to open creating excessive heat. I'm not saying you don't have a closed center system just it is unlikely unless someone went to the trouble of installing one on an older tractor. Don't take what I'm saying as 100% correct as I haven't seen your entire system but I'm going to give a little food for thought, if your pump is open center and your engine is loading indicating the pump is creating resistance and the line with the gauge teed in it is from the pump and it is only holding 1000 psi then the bypass as you referred to it is a relief that is dumping fluid back into the return hose holding the pressure at 1000 psi, or somewhere in the system there is another relief valve doing the same or your pump is worn or not capable of producing any more than that. Without a relief valve in the system you can dead head the pump in a open center system damaging the pump or pump drive, a worn out pump might let the system work for a while but even a low pressure one would be damaged by dead heading it. On and open center system when in neutral the gauge you have show should read 0 psi or there about depending on downstream restrictions . Some valves can be converted from open to close by removing a special converter plug. I'm pretty sure you have a close center valve, one easy way to check is remove the in and out hoses with the valves in neutral try blowing low pressure compressed air into the in port if its open center then it will come out the out port, if closed center then it won't either way be careful as the remaining oil and compressed air can injure you.