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Harry Ferguson Tractors Discussion Forum
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3pt wont work

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fergman

06-19-2007 15:02:00




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My 3pt didnt work on my TO20 so I tore the hydraulic cover off cleaned everything got a new control valve. Put it all back together and still nothing. Any ideas?




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fergman

06-24-2007 15:59:36




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 Re: 3pt wont work in reply to fergman, 06-19-2007 15:02:00  
I took the round cover off the valve was in the out position and the forks wouldnt move when I tried. So I pushed the valve in. It was pretty hard. I got the forks to move a little when running and finally the 3pt. went up, but then wouldnt go down. I shut the tractor off and the 3pt. went down. Now with the tractor off the forks move a little and the valve is in the out posistion again.



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fergman

06-23-2007 15:19:47




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 Re: 3pt wont work in reply to fergman, 06-19-2007 15:02:00  
Sorry I wasnt thinking. It wont raise. Could I have put the valve in wrong? I tried lifting it by hand also while engaging the lever and still nothing. If my PTO works that means my hydraulic pump is functioning correctly. Right?



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Jerry/MT

06-23-2007 15:57:14




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 Re: 3pt wont work in reply to fergman, 06-23-2007 15:19:47  
That's better! Unfortunately, since you took things apart and then reassembled everything.....

If the PTO turns that means your pump is turning because the the pump and PTO are driven together. That doen't mean your pump is good. It just means it's driven which is good. The usual causes of failure to lift is gross leakage in the lift cylider due to worn seals and/or cracked cylinder, lots of leakage in the supply tube to the top cover, relief valve stuck open, or control fork came off the control valve.


Open up the right hand side plate on the hydraulic compartment, start the engine, and engage the PTO lever on the left side. Put the lift lever in the full up position. Now take a flashlight and look at things in the hydraulic compartment. (UNDER NO CIRCUNSTANCES PUT YOUR HANDS IN THE COMPARTMENT WHEN THE ENGINE IS RUNNING!)Is there more than a few drops of oil dripping from the lift cylinder area overhead? If so it's leaking duew to bad seals, a cracked cylinder or a bad gasket. Using a mirror and your plashlight, look in the right front corner of the hydraulic compartment. Is there excessive leakage? if there is then you'll need to fix that. Now move the control lever slowly up and down and observe the motion of the control fork that's attached to the control valve. Is it moving? if it ain't you'll need to figure out why. Now you said you replaced the control valve didn't you. What made you do that? Did you put the control fork back on correctly? Look near the rear of the pump, Is there a lot of noise and turbulence? If so, your relief valve is open and it shouldn't be.

I believe you said the lift cylinder was loose also before you took it apart. Chances are that gasket between the cylinder and the top cover was the was the root cause of your initial problem.

Go make these checks and then get back here with the results so we can help you.

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Fergman

06-20-2007 19:28:48




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 Re: 3pt wont work in reply to fergman, 06-19-2007 15:02:00  
I pulled it because it wasnt working and i figured i would explore it. I found bolts it there that held the work cylinder in place so it wasnt held in place so i thought that that was the problem.



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Jerry/MT

06-22-2007 19:27:15




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 Re: 3pt wont work in reply to Fergman, 06-20-2007 19:28:48  
Come on, Fergman! When you say it isn't working, what does that mean? It doesn't stay up, it doesn't lift, it stays up when you move the lift lever down, etc.

We're not mind readers. Just tell us what the problem was that you were experiencing. Telling us "...it didn't work...." is not very descriptive!



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John (UK)

06-20-2007 11:12:30




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 Re: 3pt wont work in reply to fergman, 06-19-2007 15:02:00  
You can never just pull a hydraulic apart until you know what it is or isn"t doing and then you have to decide what is causing it. So now you need to check it all again. Have you checked for leaks, does the Control Fork move the Control Valve, does the control Lever move the Control Fork inside,is the Pump running..If you need some idea of what to check and how to do it, email me at:- fergusontractors(at)tiscali.co.uk
and tell me again what has happened.

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Jerry/MT

06-20-2007 10:30:47




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 Re: 3pt wont work in reply to fergman, 06-19-2007 15:02:00  
What was the problem that caused you to take the lift cover off?



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