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Ford 640 - Lift Arms not going up or down...

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Author  [Modern View]

10-03-2017 03:46:19

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Recently picked up this tractor..
Repaired the lever that allows the lift arms to move up and down because it was broken..

Changed all fluids including hydraulic fluid.
Start the tractor / move the up down lever and nothing.

Lift arms probably haven't been used in years.
Has anyone had any luck applying air pressure to the dip stick hole to prime the hydraulic pump and if so..
is this way of priming the pump common?

Looked but don't see a bleeder screw anywhere on pump? which is weird...

I don't plan on using the lift arms for anything just yet but figured it's the only thing not functioning on this ole 55 Ford.. might as well fix it.

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10-03-2017 06:58:43

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 Re: Ford 640 - Lift Arms not going up or down... in reply to PatsTractor, 10-03-2017 03:46:19  
When I prime the pump. I remove the plug in the pump and attach a clear rubber hose to the pump and then remove the filler plug under the seat. Put the other end of the hose in the filler hole. Start it up and let it run till I don't see any air bubbles in the hose.

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Larry NCKS

10-03-2017 05:35:39

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 Re: Ford 640 - Lift Arms not going up or down... in reply to PatsTractor, 10-03-2017 03:46:19  
I've never tried the air pressure thing, but understand it does work.

Does your tractor have the vane style pump, perhaps? I believe a '55 would be old enough to have originally been equipped this way.
Unless you have an aftermarket pump of some kind, there should be a plug you can remove to prime it. A vane type pump should have this plug on the lower right front side of the center housing, whereas the piston pump will have it on top front.

Contrary to Grandpa Love's advice, I completely remove the plug for priming. You will not get an oil bath if pull the coil wire (gasoline) or leave the injection pump shut off (diesel) and simply bump the starter until the pump is primed.

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Grandpa love

10-03-2017 07:02:46

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 Re: Ford 640 - Lift Arms not going up or down... in reply to Larry NCKS, 10-03-2017 05:35:39  
Oh. So with tractor running , don't remove plug!! Makes sense. Now. Lol

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Grandpa love

10-03-2017 04:30:06

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 Re: Ford 640 - Lift Arms not going up or down... in reply to PatsTractor, 10-03-2017 03:46:19  
We just dealt with same issue on a 640. Saw the video on YouTube about blowing air in dipstick hole. Seems to work. Also we bled air out of plug on top of pump,on side of motor. Don't take it all the way out unless you wanna bathe it fluid!! We had taken hydraulic cover off and didn't change 0 rings when we put it back on. Going ok now .

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10-03-2017 15:20:10

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 Re: Ford 640 - Lift Arms not going up or down... in reply to Grandpa love, 10-03-2017 04:30:06  
Thank you to both of you gentlemen..

Well appreciate the info.

I'll try blowing air in the dip stick and look for a plug again but didn't see it first time around.

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