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Fordson Tractors Discussion Forum

1961 Fordson Super Major 3 Point Hitch Won't Lift

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11-09-2019 13:40:00

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Good afternoon all. Putting a call out to all Super Major experts. I've got a real stumper. Regardless of what I do 3PT will only go up slowly under no load, regardless of control position. It can be pushed down by hand while this is happening and will just slowly go back up. I have 1700 psi of pressure, have extensively read many posts here and have:

Change oil to aw32, checked and cleaned check valve, removed and polished gently unloading valve, no o ring in place, also cleaned and polished control shuttle, cleaned polished and rebuilt valve chest, replaced exhaust filter, made sure all shuttle valves move freely with gravity.

I am stumped, have rebuilt many tractors and have never had one be quite so stubborn, but I refuse to give up. Have been fooling with this one for just over a year.

I can provide more details but don't want to make this to long to read.

Please help!

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11-10-2019 01:43:41

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 Re: 1961 Fordson Super Major 3 Point Hitch Won't Lift in reply to l_i_n_c_o_l_n, 11-09-2019 13:40:00  
You are about 1000 psi down on pump pressure, it should be 2500 to 2600 psi.

Low pressure can be caused by blown pump "O" rings, Faulty pressure relief valve or a stuck valve in the Auxiliary Service Chest. If possible, try another ASC from another tractor before getting too involved.

How did you "polish" the valves? Hopefully with a household polish like "Brasso", any abrasive medium like wet and dry paper or emery cloth can terminally damage the parts and make your problems worse.

Faulty "O" rings on the ram cylinder or pressure pipe can also cause low pressure.

AW32 is the wrong oil and will cause wear in the gears in the rear end. It should be Tractor Oil Universal or at least a 20/30W for the lift to work correctly.

Your problem sounds unload valve related if the lift goes up with the control lever in the lowered position but it could also be return valve on the return filter in the lift or just the thin oil bypassing worn lift valves.

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