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Chaining-down the rear lift arms on a 3000

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Bob Unitt

02-24-2007 03:44:00




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In topic 'trip bucket questions', 300OH wrote :-

As we got the tractor, a line was plumbed out of the top of the top cover, thru a valve, to the cylinders. To make this work, the rear lift arms had to be chained down (I wondered about this, too, until I found it mentioned in the Ford manual).

I've never heard of this before, could you expand on it please ?




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Bob Unitt

02-24-2007 11:44:49




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 Re: Chaining-down the rear lift arms on a 3000 in reply to Bob Unitt, 02-24-2007 03:44:00  
Thanks for your replies - very interesting. I've got an FEL with a hydraulic bucket tip, which requires the main hydraulic lever to be in the mid position before it will work; but it doesn't say anything in the Operator's Manual about chaining the arms down.
[fx: looks more closely at manual, does double-take...]
Oops ! - I've just noticed that it says I should be using Draft control with an FEL, whereas I've always used Position control - I'll have to try Draft next time I've got the loader mounted, to see if it actually makes any difference.

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karl f

02-25-2007 00:31:57




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 Re: Chaining-down the rear lift arms on a 3000 in reply to Bob Unitt, 02-24-2007 11:44:49  
one reason behind using draft control mode is that there is a neutral and hold detent about 1/2 way on the quadrant. position control seems easier to use though. read that manual cover to cover a couple times and you can piece it together better. from a literary standpoint those manuals are terrible. there is a selector valve that you have to add on if i remember right that bypasses the lift cylinder, so you can avoid chaining down. some tractor suppliers offer add on remotes that retain lift cylinder function yet let you use both remotes and 3 pt at same time. and you gain 2 way hydraulics. ford originally offered those as well. for versatility it's worth it to have the actual remote(s) vs three point conrtrols only.

-karl f

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Bob Unitt

02-25-2007 00:41:20




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 Re: Chaining-down the rear lift arms on a 3000 in reply to karl f, 02-25-2007 00:31:57  
Karl, I've got a selector valve on mine, called the 'Auxiliary Services Control Valve' (aka 'spool valve' ?), which can be set to feed either the 3-point, the FEL (via it's own control box), or both; but it still needs the 3-point to be 1/2-way up before the FEL will operate.



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karl f

02-25-2007 07:42:54




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 Re: Chaining-down the rear lift arms on a 3000 in reply to Bob Unitt, 02-25-2007 00:41:20  
the aux service valve is one way to add power beyond the 3 point, but it is only 1 way and for one cylinder/task and it ties up your 3 point. on the late 3000 series there is actually 2 way remote valves available that bolt in place of the aux service valve or lift cylinder top plate from ford (at time of manufacture). page 11-12 and 29-30 in operators manual #se 322586850 saw those available in a parts catalog from an aftermarket company recently too. possibly even thru this website?

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Bob Unitt

02-26-2007 00:25:43




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 Re: Chaining-down the rear lift arms on a 3000 in reply to karl f, 02-25-2007 07:42:54  
My Operator's Manual isn't numbered like that - it's a UK one, with each chapter having its own letter, and the page numbering restarting on each chapter. The only thing that looks like a part-number is 'SE3112' on the back cover.



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3000 OH

02-25-2007 05:12:53




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 Re: Chaining-down the rear lift arms on a 3000 in reply to Bob Unitt, 02-25-2007 00:41:20  
Bob - Something no one has asked or you haven't offered...what make/model/year tractor do you have? We might all be talking apples & oranges.



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Bob Unitt

02-26-2007 00:27:35




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 Re: Chaining-down the rear lift arms on a 3000 in reply to 3000 OH, 02-25-2007 05:12:53  
It's a UK-built 1965 Pre-force 3000 / Super Dexta.



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3000 OH

02-24-2007 10:51:15




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 Re: Chaining-down the rear lift arms on a 3000 in reply to Bob Unitt, 02-24-2007 03:44:00  
I'd have to dig thru the manuals again but it has something to do with the fact that, when the lift arms are in the full up position, the lift mechanism under the top cover shifts out of lift mode (I haven't used the correct terms there, so bear with me if someone else weighs in and corrects me). Anyway, that all makes sense, since you don't want the pump to be dead-heading against a (now) immobile object (i.e., it's reached the end of its travel), so the hyd circuits shift to a bypass state. Since the 3 point control lever is used to raise/lower the FEL in this setup, then lift arms up = no more control authority out of the lift handle, so the circuit out to the FEL is shut off. Locking the arms down fools the circuit into thinking that it's still in lift mode, the fluid is bypassed out to the FEL cylinders, and it all works. BTW, ours has a separate on/off valve in that bypass line so that the FEL can be safely locked in one position and an accidental bump on the lift lever won't send the FEL suddenly up or down. Hope this helps. Easier to show than to explain.

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RICKWI

02-24-2007 09:10:19




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 Re: Chaining-down the rear lift arms on a 3000 in reply to Bob Unitt, 02-24-2007 03:44:00  
It dates way back to when Brennulea and Paskal were working together at some Principles place for equal and opposite pressures and working things out in all directions but doing the easy ones first. When they piped the first primitive loader in series with the onboard hydraulics, they found that the empty three point was lifted easily while the loader layed limp. Then when the 3. finally got up, enough pressue built in the system to get the loader to rise. They sayeth, let us tie that 3. sucker down so as therefore the loader willst be the easier load and will now go first in the lifting challenges.

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