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Ford Tractors Discussion Forum
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How to bleed Ford 7000 hydraulic pump ?

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Bob Unitt

12-30-2005 08:33:53




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I have a pre-force Ford 3000 to which a previous owner has fitted a Ford 7000 (allegedly) hydraulic pump. My hydraulics are bit 'jumpy', so I'd like to try bleeding the pump to expel any trapped air, before I start taking things apart... Can anyone tell me how to bleed this particular pump, please ?




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RodInNS

12-30-2005 09:30:40




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 Re: How to bleed Ford 7000 hydraulic pump ? in reply to Bob Unitt, 12-30-2005 08:33:53  
Hmmmm.....
I'm guessing that the purpose behind fitting the different pump was to be rid of the piston pump, and get a gear pump. I'd also suspect that the pump fitted was the auxiallary pump from a 7710 or similar tractor rather than a "7000". I could be wrong, but I'd have thought that the 7000 only had a single gear pump in the rear axle center housing, and you couldn't fit that to a 3000, but the auxialliary pump from the later tandem systems on the 10 series could probably be fitted. So.... If you have the gear pump with the filter above the pump, you don't need to bleed it. Gear pumps are self priming. However, if there is air in the system, you could check the O-Rings on the suction tube, and the tube generally to make sure that it's not drawing any air. Even if the tractor still has it's own piston pump, if the lift is working, then the pump doesn't need to be bleed. "Bleeding" is only priming to get the air out initally, and get oil moving. If it's moving oil and the lift is working, then it's already "primed". However, that herky jerky motion is a sign of induced air, and indicates an air leak on the suction side of the system.... HTH.

Rod

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Bob Unitt

12-30-2005 11:49:18




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 Re: How to bleed Ford 7000 hydraulic pump ? in reply to RodInNS, 12-30-2005 09:30:40  
Rod,
The pump is fitted in the same place as the original 3000 pump, and is driven by the same mechanism. It has a large white filter on top, but no sign of any bleed- or drain-plugs.
I've cleaned it up and found a label... It's not too clear, but it looks as if I have a 'Sundstrand' pump, type 'E1NN 600 HB', date code '94 A 07'. If anyone here is familiar with this pump I have a couple of questions :-
1) Is the filter-element washable or does it have to be replaced ?
2) If it's to be replaced, what's the part-number of the new element ?

Incidentally, when searching for 'Sundstrand E1NN' on Google I ended up trying to access a restricted USAF page, so I expect the Black Helicopters will be here for me shortly :-)

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murn-ga

12-30-2005 14:32:03




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 Re: How to bleed Ford 7000 hydraulic pump ? in reply to Bob Unitt, 12-30-2005 11:49:18  
Bob, I can tell you that this is not a 7000 pump, probably a 10 series by the date code. Sundstrand is the mfg and the Einn number is the part number at that time. The filter is a screw on type throw away. Two versions, short-D8NNB486EA and long D8NNB486CA. Without down ex you can use the long. To not confuse the issue,if you go to NAPA or any auto store ask for a hyd filter for a 3600 Ford. Long or short will be fine.

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Bob Unitt (UK)

12-31-2005 01:31:03




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 Re: How to bleed Ford 7000 hydraulic pump ? in reply to murn-ga, 12-30-2005 14:32:03  
Thanks for that. I don't know who NAPA is (I'm in the UK), but I'll see if my local agricultural engineer has one after the holiday.
As a matter of interest, do you know if this is a gear-pump or a piston-pump ?



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murn-ga

12-31-2005 07:43:28




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 Re: How to bleed Ford 7000 hydraulic pump ? in reply to Bob Unitt (UK), 12-31-2005 01:31:03  
It is a gear pump.



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RodInNS

12-30-2005 14:31:57




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 Re: How to bleed Ford 7000 hydraulic pump ? in reply to Bob Unitt, 12-30-2005 11:49:18  
You have the gear pump. There isn't a bleeder plug, and it doesn't need one, as it's self priming. The filter is a spin-on, and is not washable. The part number is (I think) D8NN-B486-EA. I'm not positive on whether the first part of the number is D8NN or D5NN. The rest, for certain, is -B486-EA. It's also possible that the longer D8NN-B486-CA will fit. It's not called for on the engine end pump, but it will generally fit on the 3 cylinder tractors.
Again, I'm not positive on the exact part number; just tell the parts man that you need the spin on hydraulic filter that ends in EA. HTH.

Rod

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Bob Unitt (UK)

12-31-2005 02:51:04




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 Re: How to bleed Ford 7000 hydraulic pump ? in reply to RodInNS, 12-30-2005 14:31:57  
Rod, thanks; and thanks also to everyone else who helped.

And - a Happy New Year to you all !



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Ultradog MN

12-30-2005 09:11:53




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 Re: How to bleed Ford 7000 hydraulic pump ? in reply to Bob Unitt, 12-30-2005 08:33:53  
Bob,
There is an allen head plug on the rear end of the pump - about 5/15" size If I remember.
With the tractor running open it just enough to let some oil/bubbles escape.
Jerry



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Bob Unitt

12-30-2005 11:28:17




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 Re: How to bleed Ford 7000 hydraulic pump ? in reply to Ultradog MN, 12-30-2005 09:11:53  
Jerry,
Definitely no allen plug on this pump, although I've got one on the other 3000 (original pump).
See my reply to Rod for further information.



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