Ford 4600 lift problem

[daniel20vm]

Hello. At the beginning I want to apologize for the spelling, but translators are translate google translate because I'm from another country.

I have bought a FORD 4600 tractor for a long time and I have a problem with plumbing from the very beginning

The oil and filter in the hydraulics was changed half a year ago (he worked 200 mtg), and the fact that the previous owner assured that recently when he used the lift (ie about 2 months ago) everything was ok.

I noticed that under load when the lift lifts up everything is ok (floats smoothly, does not tug) but when it reaches the required height, it gradually descends and raises again. As a result, raising and lowering the tractor trembles so that it can not withstand it. What could be the reason? I will add that the tractor is equipped with a front loader that goes flawlessly .... (for those who do not know I'll add that this tractor has a lever under the seat to change the hydraulics (works or jack or turn)). I also know that the tractor has the regulation of the pace of the hydraulic pump, but if I did not set it all the time the front loader works without changes (it's ok) and the lift bounces ...

The oil condition when I check on the dipstick is ok (the tractor has the one behind the rear left axle).

I read was similar when the oil filter was changeable (but then they wrote nothing about the front loader) and in my case it was changed six months ago. Others wrote that in the manifold the valve was stuck (I think it's No. 27A or 24 in the picture No. 3). Still others that the manifold under the seat has been damaged (hydraulic switch for lift or turn).

I am surprised that the front loader works properly, and the lift tugs ... If the filter (No. 71 in picture 3) was to blame, would it be possible for the front loader to work properly and the lift tugged?

My lift is behaving all the time like on this movie from 2: 10sec

Ford Golden Jubilee Lift Issues - YouTube

What can cause the lift to tear?

1. The interior of the tractor (from white plastic comes the lever to change tur / jack)
2. I have such a hydraulic distributor (except that I have a working pace in the cabin) (photo borrowed from the Internet)
3. Diagram of hydraulics and distributor (photo borrowed from the Internet)

 

[Seven Gables]

My best guess is your internal cylinder/ram needs new piston seals. It's leaking bye then your position control tells it to go back up over and over. Just a guess though. Good luck with it. B

 

[fritz423b]

My best guess is your internal cylinder/ram needs new piston seals. It's leaking bye then your position control tells it to go back up over and over. Just a guess though. Good luck with it. B

This sounds right. I had a similar problem with hydraulic filter clog but everything was affected, three point, front loader and steering.

 

[daniel20vm]

To get to the cylinder I have to take off the cabin? Can you unscrew the floor in the cabin? I have the type of cabin Q

I'm sorry to ask you a question, but I can not do it myself in the tractor because I'm not at home ...

Can he be guilty of valve 27A?

 

[Seven Gables]

I don't think you have to take cab off. By memory 30 yrs ago, you have to access it by taking the heavy cast top off the rear axle, first remove the seat. All linkages and hyd lines need to be removed that prevent removal. Cab probably makes more difficult. My old 3400 ford is the tractor I was into, no cab but similar. I'd make quite sure you think that's the problem before doing, quite a job to do especially with a cab. Might of been closer to 40 yrs ago. B

 

[daniel20vm]

I have one more question. I thought about these cylinder o-rings, but it seems to me that if they were damaged (ie leaky and lost pressure) then after lifting the lift and turning off the tractor, the jack would drop down. In my tractor, the lifter with the connected machine when the tractor is raised and turned off, the lift does not fall down .... So it seems to me that it means that the o-rings are not broken ...

Well, unless it's wrong?

Can he be guilty of valve 27A?

 

[Seven Gables]

Yes I would have to agree if the 3pt arms stay up maybe settle slowly over time with a load this is normal and your seals are most likely ok. What have you got mounted and trying to lift? If it's a back blade or anything that is used above ground you should be using the position control lever which is the outer most one. The inner lever is your draft control and is used for soil engaging implements such as a plow or subsoiler tooth, it maintains a selected draft load on your soil engaged tool. Maybe you know this? For just lifting and no need for draft control leave the inner draft control lever all the way down and only use the outer position control lever. Just want to make sure this isn't the trouble. B

 

[daniel20vm]

Yes, I know what you're talking about with these levers. But he does the same on both levers (trembles). I even tried to move and tinker two at the same time. If I did not combine, I always tremble ...

I will say one more thing that I noticed. When I clip the machine I lift the jack up and when it starts to tread I turn off the tractor, the machine drops down immediately

But when I clip the machine, I lift it up and when it starts to shake it will change the hydraulics to front lader (with the lever from the first photo that comes out of white plastic) and then turn off the tractor (with the hydraulics set to front lader) the machine does not fall ....

Do you suspect something else after what I wrote?
I think 99% is a valve, but which one? 27A? Or maybe the hydraulic switch has been damaged and is he responsible for that?

Please help because I do not have strength anymore

 

[showcattle]

For just lifting and no need for draft control leave the inner draft control lever all the way down and only use the outer position control lever. Just want to make sure this isn't the trouble. B

I would check this out. Inner lever should be all the way down, use outer lever to raise and lower.

 

[daniel20vm]

As I wrote above - I tried the inner one down and raised the outer one and trembled. I tried the opposite - it also trembles. I even tried to lift both, and it trembles ....

That's why I suspect it's a valve, as I wrote above. Any ideas?