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Harry Ferguson Tractors Discussion Forum
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Jumpy hydraulics.

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Bill Brox

07-22-2005 03:03:38




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Hi, my cousins TEF 20 got a jumpy hydraulics yesterday. What can be wrong ?

First it would not lift up at all, but after sitting a while and then trying, it lifted but jumpy.

Anyone have a clue here ?


Bill




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John (UK)

07-22-2005 09:00:36




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 Re: Jumpy hydraulics. in reply to Bill Brox, 07-22-2005 03:03:38  
What implement does he have on it?
It may be a sticking Control Valve or an adjustment. When you say "jumpy" do you mean it lifts in little jerks but all the way up, if it is that it sounds like oil starvation (low oil) or a blown gasket or "O" ring. Does it only lift part way up. Could be any of the above, can you give us more info. mail me at:- fergusontractors at tiscali dot co dot uk



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Bill Brox

07-23-2005 15:20:17




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 Re: Jumpy hydraulics. in reply to John (UK), 07-22-2005 09:00:36  
Well, I was there today, and we used the tractor some. It is also weak, but it did not have the jumpy symptoms. I am sorry I am not able to give a more accurate explanation, because I was not there and could see for myself.
But, today it would not lift me when I was standing on the rake. If I went off the rake it lifted slowly. If I went back on, it lifted me when he reved the engine some... about 1200-1500 rpm or so. But on idle, there was very little lift capacity.
The strange thing is that it seems to change in behavor.

Bill

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John (UK)

07-24-2005 04:39:16




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 Re: Jumpy hydraulics. in reply to Bill Brox, 07-23-2005 15:20:17  
Have you checked the Control Spring at the back of the seat, you should JUST be able to turn it when you have an implement raised on the three point linkage if it is slack it will need adjusting BUT you may not be able to do that easily as it will be possibly rusted up by now and will require freeing off. If you attempt to try to adjust it there is the possibility that you will destroy the Control Fork inside so the Hydraulic Cover will need removing to do this. If the Control Spring adjustment is ok then you will need to check for leaks internally, if you email me at: fergusontractors at tiscali dot co dot uk
I will send you some information sheets I have prepared to enable you to do this work, when you mail me please remind me what you require and what the problem is though. I hope that you have checked the oil level???

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Bill Brox

07-24-2005 09:47:33




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 Re: Jumpy hydraulics. in reply to John (UK), 07-24-2005 04:39:16  
Hm... I wonder... the ram is fastened with 4 bolts - nuts through the hydraulic cover. And, now I come to think that the front right of them has recently been loosened because one of the battery cables is fastened there. So, maybe it was not tightened well enough.

I guess we have to check into this.

Bill



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John (UK)

07-24-2005 12:10:29




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 Re: Jumpy hydraulics. in reply to Bill Brox, 07-24-2005 09:47:33  
Do you mean front as in the FRONT of the tractor, if this is the case if it is slack at all it will leak as that is the end of the Hydraulic Cylinder that is fed high pressure oil, to make sure I would remove one of the side covers and look inside while it is trying to lift, this will give you a clue. That battery leads are best not fastened to there as you will not get it tight enough, they should be tightened to 55 - 60 lbs ft. If it still leaks it may have blown a gasket or an "O" ring, depends on the age of the tractor as they did change them. If you are fastening the Earth lead to this bolt you would be much better running a new lead right back to the starter and fastening it to one of the bolts holding the starter to the Clutch housing, it wont lose as much power and will spin the engine over faster and so start better too. Be careful when you slacken this bolt off as if it drops it will fall straight into the hydraulic Pump.

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Bill Brox

07-25-2005 11:18:44




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 Re: Jumpy hydraulics. in reply to John (UK), 07-24-2005 12:10:29  
Well, I talked to my cousin today.

Yes, we have checked the oil level, it is about 1/3 up from low to high level, should be enough for just raising a rake or so.

And today I got a better picture of how the jumpy stuff acted... he says the rake lifted about 4 inches of the ground (that is about 10 cm for those who is in need of the metric system) and it was jumping up and down there... not raising a bit more... after a minute or so, he lowered the rake, and stopped the engine. And let it sit for a couple of hours or so, then started the engine again, and then the rake could be lifted as normal.

Later the hydraulic has been weak, but today again it was mostly strong as it should be, he has been carrying wood on the rake all day long today.

What makes the scene so tricky is that it has been changing so much, but, now I suspect that maybe it can be more than one fault playing games with us. Some suggest a leaking gasket or o-ring. The weak hydraulic indicates that... but then, how come it was strong again today ? The former owner also complained about a weak hydraulic, but maybe the TEF 20 was not as strong as newer tractors he suggested, and he was of course right about that. But, maybe he also knew things he did not tell us when we were there getting the tractor.

When I talked to my cousin today, we realize that we have to take the lift cover off, and look what is down there.
Maybe it can be the safety valve, that sometimes it does not seal well after being opened once in a while, maybe dirt in there, and then maybe the dirt goes away... Only thoughts from me...

Bill

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John (UK)

07-25-2005 12:29:55




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 Re: Jumpy hydraulics. in reply to Bill Brox, 07-25-2005 11:18:44  
DO NOT strip the hydraulic system down without finding out what it is first, if you take the top off or take the Pump out all you have is a lump of iron and you will have no idea where the leak is. From what you say it is not a leak as it would be there all the time it is most likely a control problem as that will vary depending on the load etc. My immediate thoughts and which I mentioned in my earlier email was to check the clearance on the Main Control Spring behind the seat, you should just be able to turn it with a load on the three point linkage. If it needs adjusting then you MAY have to remove the top cover as it will most likely be seized up and if you try to adjust it you will damage the Control Fork inside. Don't try to remove the Top Cover without making sure that there are no leaks anywhere or you may have to remove it again if you find one later. From what you say I am inclined to think that it is Control Spring adjustment because as the load comes on as you try to lift it stops or slows down due to the control valve being moved because of incorrect adjustment. The jumping can be caused because of the same wrong adjustment as it lifts it will rock the sensing rod into the hydraulics and be moving the Control Valve slightly but enough to cause this jumping motion.If you email me at:- fergusontractors at tiscali dot co dot uk
I will send you the information with pictures of what to look for and what to do (its cheaper than breaking it)Let me know what you find with the spring though please.

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tennesseefarmer

07-23-2005 17:30:25




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 Re: Jumpy hydraulics. in reply to Bill Brox, 07-23-2005 15:20:17  
I'm assuming you guys have checked the obvious.....the correct level of GL1??



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