Ford NAA will not lift implement

Tim Crawford

New User
I have a 1954 Ford that replaced all the seals in the lift, drained the fluid cleaned everything put in new fluid and everything was working great. Ran it with box blade for 45 minutes then unhooked and put 2 bottom plow on. Went to field dropped the plow and it kept going down would not stop. Then was not able to lift the plow. If I take the implement off I am able to get the arms to lift. If I stand on the arms the lift arms will go up and down. I weight about 200 pounds. If I put the box blade or the plow on it will not lift. Can someone tell me what is possibly causing the problem.
 
May have blown a seal some place. With the plow on did you have it in position or draft contorl?? A plow needs to be in draft or you can have funny problems
 
I did have it in draft control. The tractor is on my hunting land so I don't have access to it at the moment but I was thinking it was the seal on the piston that may have broke or could it be the pressure relief valve?
 
Could be either one. Only way to know for sure is to pull the inspection plate off the one with the dip stick
 
I guess the only question I have is how likely it it that the pressure relief valve has failed. I have never was one up close and personal but what I have was for sale online for a Ford NAA looks to be nothing more than a piece of steel with several holes drilled in it.
 
A good bit more to a relief valve hen that but you have to open one up to know that. If is a spring and plug sort of set up that opens when and if you get to high a pressure on the system as a safety. That pressure is around 2000PSI
 
Well I have my answer as to what is wrong. My brother was able to stop at the hunting land, attached the box blade to the tractor and tried to lift it. Viewing through the fill hole he says it is spewing hydraulic fluid out the other side of the lift assembly. Sounds like a case of a blown gasket. Thanks to everyone who gave me advice on this issue.
 

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