The Fordson Tractor Pages Forum

Hello,

Sins my fertilizer is mounted in my 3p hitch the lift arm drops rapidly. When I started to use the lift it went down in a night. That’s normal, I think. Now it lowers about an inch at a quarter of an hour. To much I think. I thought the piston ring was worn due to a bit of pit rust in the cylinder, so I have remove the hydraulic unit to check the cylinder. The piston ring looks all right and the pit rust is at a place were the piston ring will not come.
Next thought is that the problem is at a valve or something. Because I know nothing about hydraulics I don’t know were to begin or look for.
All help is welcome.

Hello,

Today I have removed the Unloading valve, Check valve and Piston valve from the valve body. All the seats looks all right to me. No wear.
When I overhauled the lift cover, I put a new piston seal on the ram cylinder piston. It looks more as a oil seal than a piston seal to me. It has a small chamfer at the front and it’s a bit stiff plastic.
Would anyone know how the original seal looks like and is it still available?

Hello Henk,

Did you install this part?

http://www.histoparts.com/oscommerce/ca ... ts_id=1475

You might have fitted it backwards, which will cause problems.

Can't help you with what the old seal looks like. When I read your desciption, it might be that one of the valves is not free moving in the system. Could you take them out easily or not?

Best regards

Emiel

Hello Emiel,

Thanks for the link.
I think my seal looks the same, but it hard to see. I'm sure it's not fitted backwards. Better order a new one to be sure.
All the valves came out easily and were looking good.

Henk,

Is this any use? Its the new seal I had made and it works a treat. The PR Valve has been known to leak a bit depending on whether it is the needle version or the ball end version.



Yes we will all be in the gardens on the weekend after Easter. Are you and Janeke going this year? If so we would adjust our dates to fit in with you.

Thanks Brian,

Mine looks like your bleu one but is green. I will try to make a detailed picture of mine.
Can’t understand witch valve type you mean. Will post a picture to.

Check with the boss about next Easter.

Here are images from the valves and a pic from my piston seal.




Only one half of the valve is on the picture.

The valve is 4601 in your picture.

Hello Brian,

The valve looks all right to me. I know they will leak a little bit but I think mine is leaking to much.

Hello,

Received a new piston seal yesterday, looks like the right shape to me, but it was to big. Outside it's 3,5 inch. The cylinder is 3 inch.
Could it be that the Super Major needs a bigger seal?
Also I ordered a new front crankshaft seal. This has a inner diameter from about66 mm, more than 2,5 inch. Looks to large to me. Anyone knows the right diameter?

Hi Henk,

I got myself a new crankseal too. It has about the same inner diameter. The outside diameter is about 90 mm.
I haven't tried it on the crankshaft yet.

If I remember well, the old crankshaftseal could move pretty easy on the crankshaft too.

I am curious what the correct width should be.

Hello,

Today I received a new piston seal. Looks right right shape to me, although Brian changed the one I’m putting in for the one I’m getting out. I hope this will end the dropping. Let you know when things are back together.

Hi Henk,

Good to read you have received the seals.
Hopefully the job will be easily done now.

Hello,

Today I reassembled my hydraulic unit and the new piston seal. The result was not what I had in mind. The lift drops a little slower but will not stay at the same height. I think there must be something else wrong.

I saw this post but I was under the impression the problem was inside, under the seat top plate. I'm not the mechanic, .

Not on a Major! Everything other than the pump, comes out the front without having to take the lift off. Very easy to fit a new piston seal.

Henk,
Just a thought, Have you got the pipe to the gearbox as a permanent fixture? If the tap was leaking slightly it would give your problem.

When I mowed with the pull mower it had a one way remote cylinder. Once I raised the arms up the diverted fluid raised the remote of course. The thing is the arms would drop right down but the remote stayed up with no problem until I moved the control down again as though I was lowering the arms. I enjoyed mowing with it.
A rare old International 7 foot haybine with crimp rollers but before the front reel was added.

Maybe I am mistaken about it riding in the up position, it has been a few years. I guess id did leak down as well.
Have to correct myself there. I just always managed to run it like that.

Brian,

Normally it's plugged off, and nothing is leaking on the coupling. I only use it to drain the back end and one of these day's I have to pump a bit back to the gearbox.

Hello,

This is my solution for dropping the lift arms. Not my idea, it's common use by stabilising a sprayer. Works perfect. The fertilise spreader is steady as a rock and it won't lower. Of course you can’t use it when you have to raze and lower an implement for the job.

Looks great, Henk!

I have never seen such a construction like this. Great, that it works that good!

so have you got to the bottom of if yet I have the same problem.

Hello Robin,

Still the same problem. Can't seem to find the course of it.

have you found the problem yet keep looking on this page I have not seen anything posted?

Looking at the score marks on the piston, I wonder if the cylinder is also scored and you are loosing fluid around the seal because of it. Dandy Dave!

Henk - great minds think alike I have a similar arrangement of chains on my tractor. Mine just simply hook on at the top to allow quick and easy adjustment from the seat.