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Case 400 hydraulic relief valve

Yesterday's Tractor Forums
I

ih78

New User
The plunger in the hydraulic relief valve on my 400 case appears to stuck open. If I understand it right the plunger should move freely. I have tried to use needle nose pliers to pull it out but have not been able to get it to move. How can I fix this problem with out doing damage to these parts since these parts are hard to find and are costly when you do find them.
 
If it is indeed stuck open I would gently tap on it with a punch to see if you can get it to go back down. That might then free it up. What is it doing that leads you to believe that it is stuck open?

Eli
 
The hydraulics have no lifting power. I had put a 3 bottom plow on it and it worked fine when I hooked it up went out the next day to plow the
garden and it would not lift the plow. Checked the pressure it was 500psi so I thought the pump went bad replaced the pump and it still has
500psi I have tried tapping it down and pulling it out but can not get it to move either direction
 
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