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Restoration & Repair Tips Board

Ford 4600 lift problem

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danielyesterdays

08-14-2019 07:25:26




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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 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 h), 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?

https://www.youtube.com/watch?v=Hd2pG2MDGLQ&feature=youtu.be

This only happens when I have something connected to the tractor. When nothing is connected, the lift itself will not tremble.

https://www.youtube.com/watch?v=iv7UI_FwPVg&feature=youtu.be
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 (selector valve) (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).

There is enough oil. I also change the oil and filter and it did nothing - it's the same ...

I am surprised that the front loader works properly, and the lift no ...
What can cause jump the lift to ?

p.s.
One mechanic told me that the selector valve has malfunctions, I changed it to another one and the same thing continues

Please help



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JMOR

08-19-2019 09:02:09




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 Re: Ford 4600 lift problem in reply to danielyesterdays, 08-14-2019 07:25:26  
Quoting Removed, click Modern View to see



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danielyesterdays

08-18-2019 14:21:38




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 Re: Ford 4600 lift problem in reply to danielyesterdays, 08-14-2019 07:25:26  
Quoting Removed, click Modern View to see

It's the same all the time ...



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danielyesterdays

08-14-2019 12:47:04




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 Re: Ford 4600 lift problem in reply to danielyesterdays, 08-14-2019 07:25:26  
Maybe I wrote it wrong in the first post, so I will describe it again .

The tractor when the selector valve is set on the front loader, the front loader works very well (nothing jerks when lifting heavy things, and does not drop).

When I change the hydraulics to a 3 point lift, when I have no machine connected, it lifts nicely, and it's ok.

The problem is when connecting something that weighs more than about 100kg. Then when he raises to the required height he starts jumping as in the first video. But when I jump and switch to hydraulics on the front loader, then the jumping ends and the machine is raised and does not tremble (and even if it weighs 500kg, it does not fall even all night). Maybe now it will be more understandable :wink:
JMOR - I noticed that he just trembles / jumps all the time. Just as there is no option for it, you can't see it, but when the burden is on it more used.

Destroked450 - can you write me which valve? I have a service manual but I don't know if I can add a picture here, if so I will add it

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neverfear

08-17-2019 09:18:21




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 Re: Ford 4600 lift problem in reply to danielyesterdays, 08-14-2019 12:47:04  
Your videos show the tractor at idle. What happens when you have the engine at high RPM?



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JMOR

08-14-2019 11:10:14




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 Re: Ford 4600 lift problem in reply to danielyesterdays, 08-14-2019 07:25:26  
Where he says it "does not fall or jump", I wish to ask is that with several hundred pounds of load on it?



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Destroked 450

08-14-2019 10:35:24




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 Re: Ford 4600 lift problem in reply to danielyesterdays, 08-14-2019 07:25:26  
The front end loader get it's oil before the lift and it's controls so any issues with the lift do not effect the loader unless nothing works.

There's only a couple of things that cause lift bounce, piston seals leaking, control valve or linkage adjustment, if the lift stays up your probably looking at cleaning and adjusting the control valve and linkage.

This requires removing the lift top at which point I also replace the piston seals.

Unfortunately I see your tractor has a cab which makes removing the lift top a difficult job.

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danielyesterdays

08-14-2019 10:07:00




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 Re: Ford 4600 lift problem in reply to danielyesterdays, 08-14-2019 07:25:26  
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I forgot to add that when I raise the lift and it starts to jump, and at that moment changing the selector valve hydraulics to the front loader, the lift does not fall and I do not jump ... And if the lift seals were damaged even though I had the hydraulics switched to the front loader would not fall ? (because I do not fall even when I turn off the tractor with the machine raised)

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Destroked 450

08-14-2019 09:40:47




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 Re: Ford 4600 lift problem in reply to danielyesterdays, 08-14-2019 07:25:26  
The lift piston seal is leaking and the control valve is compensating for the lift leaking down by raising the life back up to the set height.

The result is the lift bouncing up and down.

You'll need to remove the lift top and replace the piston seals.

The lift on my 4000SU is bouncing slowly but hasn't gotten bad enough for me to work on it yet.

If it's bouncing up and down like a rapid heart beat it's time to tear into the lift.

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Destroked 450

08-14-2019 09:40:24




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 Re: Ford 4600 lift problem in reply to danielyesterdays, 08-14-2019 07:25:26  
The lift piston seal is leaking and the control valve is compensating for the lift leaking down by raising the life back up to the set height.

The result is the lift bouncing up and down.

You'll need to remove the lift top and replace the piston seals.

The lift on my 4000SU is bouncing slowly but hasn't gotten bad enough for me to work on it yet.

If it's bouncing up and down like a rapid heart beat it's time to tear into the lift.

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