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How to bleed hydraulics on an old 3000 ?

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Bob Unitt

09-18-2005 06:27:36




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I've seen occasional references to bleeding the hydraulics on a pre-force Ford 3000, but I've never been able to find any instructions on how to do it - could some kind soul please point me in the right direction ?

TIA




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murn-ga

09-18-2005 10:24:10




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 Re: How to bleed hydraulics on an old 3000 ? in reply to Bob Unitt, 09-18-2005 06:27:36  
You bleed the system at the hyd pump.The pump is located on left rear of engine just under fuel tank.You have two hyd tubes going to the inside of pump,a small and a larger tube. In the section of the pump that the small line goes to,you will find an alien head plug on the outside of pump.If it is diesel pull stop cable,if it is gas remove coil wire. Remove plug and turn engine over.If the system has air you will see bubbles. Turn engine over until fluid becomes solid. If milky looking,change rear axle fluid and bleed again.

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hvw

09-18-2005 11:58:20




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 Re: How to bleed hydraulics on an old 3000 ? in reply to murn-ga, 09-18-2005 10:24:10  
In addition to what Murn said you want to be sure the engine is still spinning when you put the socket head screw back in. Otherwise you'll just suck in more air. Then you're right back to square one. Easier if you have someone turn the engine while you fiddle with the screw on your first time.

On top of everything else, if priming the pump makes the system work good but it won't hold a prime but for a few hours or days, the pump likely needs rebuilding. A good tight system should hold a prime until you change the fluid.

Finally, if the system leaks down with an implement on it that's not likely a pump problem. More likely there's fluid leaking past something under the lift cover.

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Bob Unitt

09-18-2005 11:07:22




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 Re: How to bleed hydraulics on an old 3000 ? in reply to murn-ga, 09-18-2005 10:24:10  
Thanks - I'll give it a try tomorrow.



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Bob Unitt

09-19-2005 08:18:03




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 Re: How to bleed hydraulics on an old 3000 ? in reply to Bob Unitt, 09-18-2005 11:07:22  
It's now tomorrow and, unfortunately, the hole in the allen screw on my pump is round rather than hexagonal - there's no way it's coming out without a fight...
Is there anywhere else I can bleed it from, or am I going to have to strip the pump to free the duff screw ?



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murn-ga

09-19-2005 17:21:00




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 Re: How to bleed hydraulics on an old 3000 ? in reply to Bob Unitt, 09-19-2005 08:18:03  
Bob, not that i am aware of.Your luck is like mine. Today i started tearing dash out of 87 T-Bird. The reason? i hope a mouse nest restricting flow of air out any vent. Unfortunatly there is no t-bird forum. Your problem is minor. Just remove metal tubes,4 bolts that mount pump and ease it out. Take to a welding shop and they can tack a larger nut to the plug snd screw it out.Keep in mind you have springs inside and keep it as cool as possible. If i may ask why are wanting to bleed system.

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Bob Unitt

09-19-2005 23:58:43




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 Re: How to bleed hydraulics on an old 3000 ? in reply to murn-ga, 09-19-2005 17:21:00  
Thanks. I stripped and rebuilt the pump some time ago, when the main gasket (the round one with all the holes) developed a pinhole leak. The hydraulics have always seemed a bit hesitant to raise since then, so I thought it might be worth trying bleeding the system before I start digging about under the lift-cover.
Incidentally - doesn't hydraulic oil squirt a long way when forced through a pinhole at 2400 lbs pressure ? (all over my wife's brand-new stable yard, too...)

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