Case 430 Hydraulics Problems

On my Case 430 my hydraulics appear to be weak. I have taken the lifting pistons off my bucket and replaced all the O rings. Prior to replacing the O rings I installed a gauge to measure the pressure in the line. The pressure in the line is constant prior to changing the O rings and after. I have been using the tractor off and on for approximately 6 weeks, the gauge is constantly running at 500 lbs. when the hydraulic is engaged the gauge shows approximately 500 lbs. Yesterday when lifting the bucket my pressure was 500 lbs. but when the bucket was lifted all the way the pressure shot up to 1000 lbs. it has never gone this high before. Turn the tractor off and the bucket will gradually come down as time passes. The hydraulics on the back with the snow blower on it will remain up and not gradually fall down over time. I have a leak somewhere, is there any way I can determine where it is, or do I just tear everything apart and repair it? I understand my pressure should be approximately 2000 lbs. I am a little short. How do I correct my problem? Any help or suggestions would be greatly appreciated. Fellows take care of yourselves and have a great safe day. Barney

The Case 430 hydraulics should be around 1,400 PSI max. (remotes or three point) However, the problems you're having will vary depending on your tractor having a Draft-o-Matic or Eagle hitch. The Eagle hitch has hydraulic interlocks, but the Draft-o-Matic does not. Need more information. Front end loader using tractor hydraulics?

Tractor has draft-o-matic bucket system appears to be factory made original equipment.In the last year my hyl oil was leaking into the rearend I replaced the seal in the rear unit[forget name] stoping leak ,When I raise the bucket the line pressure is approximately 500 and only shows 1000 at the very top of lift if you continue to hold the leaver the preasure remains at 1000 lbs release the leaver the pressure returns to 500 and gradually goes down I have a leak somewhere [this tractor is my pride and joy my toy] ,Thank you for your help .Barney

Roger forget to mention tractor is using tractor hyl original equipment thanks again. Barney

If the loader bucket is curled back as far as possible and a pressure gauge is in the bucket circuit, the pressure should be around 1400 PSI if the bucket cylinder packing is good. I'm assuming the loader hydraulics are plumbed into the remote cylinder circuit. The heavier the load being lifted, the higher the presure reading. If the pressure never reaches 1,400 PSI when dead headed, there is a problem with the pressure relief or the hydraulic pump. Both are located UNDER the torque cover.