1970 Ford 3000 hydraulic problem

[trblshtr56]

First thanks for any response to my issue I have a 1970 Ford 3000 with an FEL, had it for 8 years now and loved it until now.
Went to lift a load one day with the loader and it would not lift and the pump got very load also no 3 point.
I rebuilt the pump and had 2700psi but still no lift action so I decided to get into the lift cover and related parts.
So far this is what I have done.
Replaced all O rings, removed unload valve which was free moving and replaced the O ring also removed the control valve which also was good
cleaned the sump and removed the suction screen and cleaned it very well (like new again), replaced the return screen with a new one and took the back pressure valve apart to check it and it seem good.
Replaced both the suction and pressure tubes along with the safety valve in the top lid and pressure relief valve on the bottom of the sump, And replaced the O rings on the suction tube.
Pulled out the plunger on the flow control valve and it looked good also seen that the tube going prom the prv to flow control was in tight and would not move up or down so I asumed the O rings in there where good.
Put in new oil and bleed the pump with a hose barb and clear hose going back to rear fill hole until no air (did not take very long) and still no lift so I installed my pressure gauge and only got 1200psi at the pump.
I tried to replace everything so I would not have anymore problems with it for several years.
I did notice that the PRV was a little bit shorter that the original but the deal where I got said it was good for my Tractor, can that be my problem or did I miss something else?
Again thank you for any advice.

 

[trblshtr56]

First thanks for any response to my issue I have a 1970 Ford 3000 with an FEL, had it for 8 years now and loved it until now.
Went to lift a load one day with the loader and it would not lift and the pump got very load also no 3 point.
I rebuilt the pump and had 2700psi but still no lift action so I decided to get into the lift cover and related parts.
So far this is what I have done.
Replaced all O rings, removed unload valve which was free moving and replaced the O ring also removed the control valve which also was good
cleaned the sump and removed the suction screen and cleaned it very well (like new again), replaced the return screen with a new one and took the back pressure valve apart to check it and it seem good.
Replaced both the suction and pressure tubes along with the safety valve in the top lid and pressure relief valve on the bottom of the sump, And replaced the O rings on the suction tube.
Pulled out the plunger on the flow control valve and it looked good also seen that the tube going prom the prv to flow control was in tight and would not move up or down so I asumed the O rings in there where good.
Put in new oil and bleed the pump with a hose barb and clear hose going back to rear fill hole until no air (did not take very long) and still no lift so I installed my pressure gauge and only got 1200psi at the pump.
I tried to replace everything so I would not have anymore problems with it for several years.
I did notice that the PRV was a little bit shorter that the original but the deal where I got said it was good for my Tractor, can that be my problem or did I miss something else?
Again thank you for any advice.

I did forget to mention that I replaced the internal O ring on the suction tube elbow and the seals on the crossbar while I had it out.

 

[TractorTech]

Welcome to TBN!
To be clear, at 1200 psi now, still no 3pt or loader action?

 

[trblshtr56]

That is correct.

 

[trblshtr56]

Welcome to TBN!
To be clear, at 1200 psi now, still no 3pt or loader action?

Yes that is correct.

 

[trblshtr56]

Welcome to TBN!
To be clear, at 1200 psi now, still no 3pt or loader action?

Yes

 

[trblshtr56]

Yes that is correct

 

[TractorTech]

Relief minimum crack off pressure is 2100 psi.

Could be the relief is opening too early.

 

[TractorTech]

I did notice that the PRV was a little bit shorter that the original but the deal where I got said it was good for my Tractor, can that be my problem or did I miss something else?

Did you have any pressure with the old valve?

 

[TractorTech]

Also, when you pulled the top cover, did you make sure that the highlighted tube didn't come with the cover and bend when you tilted the cover up on the back while pulling it out? If bent, you would lose your pressure there.

 

[trblshtr56]

Relief minimum crack off pressure is 2100 psi.

Could be the relief is opening too early.

 

[trblshtr56]

After pump rebuild I had 2700psi at the pump, replaced the prv after no lift

 

[trblshtr56]

Also, when you pulled the top cover, did you make sure that the highlighted tube didn't come with the cover and bend when you tilted the cover up on the back while pulling it out? If bent, you would lose your pressure there.

Yes I am sure, it is good and new O rings

 

[trblshtr56]

Did you have any pressure with the old valve?

 

[trblshtr56]

If you are speaking of the old prv Im not sure as I have done so much but I think so

 

[trblshtr56]

Relief minimum crack off pressure is 2100 psi.

Could be the relief is opening too early.

 

[trblshtr56]

I am thinking of putting the old prv back in if I can find a new O ring and see what happens

 

[trblshtr56]

Ok I just downloaded the manual for this and should have done it to start with but anyway the only thing I didn't do was check the check valve so as soon as the weather gets a little better I will be pulling the top lid again and see if that is the problem.
wish me luck or call me a ding dong we shall see what happens.
I was going off a video of the top ld rebuild?

 

[trblshtr56]

Quick update, I could not wait for better weather as it's going to be nasty for several more days so I pulled the top lid again and removed the check valve.
I think it was a big part of my problem as it was hard to get it out and was gummed up and the plunger was slightly pitted cleaned everything up polished the plunger and installed a new O ring and now it moves like I think it should.
I should have a new top gasket in a few day's and I'll put everything back together and hopefully all will be Ok?
Wish me luck.

 

[TractorTech]

Quick update, I could not wait for better weather as it's going to be nasty for several more days so I pulled the top lid again and removed the check valve.
I think it was a big part of my problem as it was hard to get it out and was gummed up and the plunger was slightly pitted cleaned everything up polished the plunger and installed a new O ring and now it moves like I think it should.
I should have a new top gasket in a few day's and I'll put everything back together and hopefully all will be Ok?
Wish me luck.

Makes sense!