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Fordson Tractors Discussion Forum

Can you adjust hydraulic lift pressure on a power major

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Graveyard1984

11-24-2018 10:52:41




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I have a fordson power major i was wondering if you could adjust the lift pressure on the three point hitch. Ive had the control valve rebuilt. I can lift a small round roll of hay about 6 to 8 inches off the ground.
I just wish it would lift a little bit more. Didn't know if there was a was to adjust it or not thanks




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Majorman

11-26-2018 03:08:47




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 Re: Can you adjust hydraulic lift pressure on a power major in reply to Graveyard1984, 11-24-2018 10:52:41  
Yes you can but it is something that needs to be done with a pressure gauge rather than by trial and error as the "error" bit can cost you a new hydraulic pump. As these are no longer available, the later pump has to be fitted and the adaptor fittings are not easy to find.

As you sit on the seat and look down at the valve chest you will see two plates held on by small bolts. Take the one off nearest the control lever, underneath there is a spring and possibly some shims. Shim the spring with a small washer. In the past people have used a sixpenny piece of a dime coin between the plate and the top of the spring. Replace the plate and test.

You do need to know what pressure you started with and what the pressure is after your adjustment to avoid problems. 2000 to 2200 psi is the correct "cracking off" pressure.

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Majorman

11-27-2018 01:07:33




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 Re: Can you adjust hydraulic lift pressure on a power major in reply to Majorman, 11-26-2018 03:08:47  
Just another thought. Before getting into pressure testing and hydraulics have you tried moving the pins where the lift arms connect to the lower links? There are three holes in the lower links and, if you move the lift arms back towards the ball ends you will find she lifts more.



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Graveyard1984

11-28-2018 22:01:52




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 Re: Can you adjust hydraulic lift pressure on a power major in reply to Majorman, 11-27-2018 01:07:33  
Ok my actual lift arms has 2 holes on each side. Right now they are in the hole closest to the tractor rear end,so i need to move them towards the implement end of the lift arms?
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Majorman

11-29-2018 01:38:45




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 Re: Can you adjust hydraulic lift pressure on a power major in reply to Graveyard1984, 11-28-2018 22:01:52  
Yes, in theory the inner holes are for the check chains, the two outer holes are for the lift arms.



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Graveyard1984

11-29-2018 19:21:05




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 Re: Can you adjust hydraulic lift pressure on a power major in reply to Majorman, 11-29-2018 01:38:45  
Do you have a picture so I could see what holes it should be in

Thanks



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Graveyard1984

11-29-2018 19:19:28




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 Re: Can you adjust hydraulic lift pressure on a power major in reply to Majorman, 11-29-2018 01:38:45  
Two holes close together and one on the very end where the implement hooks

Ive tried to post a pic of it but can't get it to post



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Graveyard1984

11-29-2018 19:13:14




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 Re: Can you adjust hydraulic lift pressure on a power major in reply to Majorman, 11-29-2018 01:38:45  
What is check chains My lift arms only has to holes

Thanks



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Majorman

11-30-2018 01:21:08




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 Re: Can you adjust hydraulic lift pressure on a power major in reply to Graveyard1984, 11-29-2018 19:13:14  
Your picture shows check chains in the outer hole and lift arms in the inner hole making lifting a very hard job. Your tractor may have the later arms with only two holes. Forget the holes where the implement fits, they are not the ones we are talking about.



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Graveyard1984

11-30-2018 04:05:00




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 Re: Can you adjust hydraulic lift pressure on a power major in reply to Majorman, 11-30-2018 01:21:08  
So if i move it to the last hole where the stability chains hook it will actually lift more. I am willing to try anything cuz am having trouble feeding hay. Thanks for your knowledge and help.
third party image



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Majorman

11-30-2018 06:24:04




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 Re: Can you adjust hydraulic lift pressure on a power major in reply to Graveyard1984, 11-30-2018 04:05:00  
That is right. According to the handbook the front hole, where you have the lift arms now, is for the check chain (stability chain). The next one back is for lighter implements and the third one is for heavy lifting. I run mine in the rear hole only changing to the middle hole to get the lift arms down for low hitches on implements.



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Graveyard1984

11-30-2018 18:56:55




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 Re: Can you adjust hydraulic lift pressure on a power major in reply to Majorman, 11-30-2018 06:24:04  
Ok thanks



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