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Ford Tractors Discussion Forum
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Re: Ford 640, lift stuck up

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Author  [Modern View]

02-17-2014 06:58:46

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first determine if the lift is held up hydraulically. (probably not ).. or mechanically. ( probably ).

remov ethe plug in the 3x5 cover under the seat. it a jet of oil comes out and the lift drops.. stuck valve!

if no oil comes out and lift don't drop, leave plug out and take a drilling hammer and tap on the arms. could be simple rust on the shaft making them tight in the bushings.

if the sump is wet.. add osme diesel and atf and 90% rubbing alcohol to it. ride it around the yard a couple laps.. then drain ( flush ).. and refill. do remember to put that plug in BEFORE starting tractor. :)

post back

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02-17-2014 15:47:40

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 Re: Ford 640, lift stuck up in reply to soundguy, 02-17-2014 06:58:46  
Removed cap and fluid didn't squirt in my eyes' but it was not running. By drilling hammer I assume you mean " hand sledge"' 4# or 5#, or at least that is the term I use. I did jump on the bar holding the fenders, but will step it up a notch to some gentle persussison.

On the mixture, thoughts on amount (pint, quart, etc) proportions (1:1:1, etc)


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02-18-2014 06:04:46

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 Re: Ford 640, lift stuck up in reply to NYTX, 02-17-2014 15:47:40  
not sure what cap you removed.. but i'm talking about a plug. a pipe plug.. not a cap.

drilling hammer is likely 2-3#

when i clean em i put in about 3g diesel, a quart of atf and a couple pints of 90% alcohol. if it was real wet. 3 pints.. etc.

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02-18-2014 07:10:33

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 Re: Ford 640, lift stuck up in reply to soundguy, 02-18-2014 06:04:46  
Quoting Removed, click Modern View to seeThis plug:


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02-18-2014 08:06:51

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 Re: Ford 640, lift stuck up in reply to JMOR, 02-18-2014 07:10:33  

Thanks guys. I didn't read Soundguy's comment thoroughly and confused it with the fill cap.

On the cleaning solution, do I just add that in on top of what is already in there or should I drain it first, add the solution, run it, then drain and refill with fluid?

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02-18-2014 08:33:07

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 Re: Ford 640, lift stuck up in reply to NYTX, 02-18-2014 08:06:51  
drian first then dump my stuff in.

edit that to be 2g diesel and 1qt atf and a couple pints alcohol.

the earleir 3g version is for N's with common sump. while te hyds on a 00/naa will hold 3g.. no need to fill it that much for a flush. waste of diesel.

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02-28-2014 17:51:48

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 Re: Ford 640, lift stuck up in reply to soundguy, 02-18-2014 08:33:07  

When I removed the plug, fluid came out (got a soaking) and the lift fell.
I ran the cleaning solution through twice and drawbar still raises to highest level as soon as I start it again.

It is now completely drained (no oil), and it holds the drawbar at level that I could pull a wagon with.

So, a few questions

1. Will I harm anything if I don't put fluid back in and hook up a wagon with very little weight and pull it around? I will not be using the hydraulics to lift anything. This is just a temporary setup until I can work on it again. If I put any oil in, it will likely raise the drawbar so high it will not be usable.

2. What are my next steps? I have the repair manual, but prefer not to just start taking things apart without knowing what I should be looking for. The disassemble looks straight-forward enough, but once all the bolts are out, which valve (using terms that correlate with the manual) should I focus on?

3. Any items should look out for when removing?

Thanks for all your help.


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02-28-2014 18:29:23

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 Re: Ford 640, lift stuck up in reply to NYTX, 02-28-2014 17:51:48  
if you run it without oil you will ruin the 500$ pump bolted to the side of the engine.

if the lift is going max at start.. the unload valve is sticking.. you need to pull the lift cover to address it.

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02-28-2014 18:45:03

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 Re: Ford 640, lift stuck up in reply to soundguy, 02-28-2014 18:29:23  
Thanks. I will fill it up and post back.

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02-28-2014 18:53:01

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 Re: Ford 640, lift stuck up in reply to nytx, 02-28-2014 18:45:03  
if you have to use it and need lift half up, run a hose from the 3x5 cover under the seat ( plug there ). and run it to the hyds sump fill, that will let pressure off the lift piston. then chain the lift arms to the axle with a block of wood under them to keep them at set height.

that willlet you drag a drawbar implement. and not ruin the pump. oil will cycle out of the top cover back to hyds sump under lefs side of seat ( fill hole )

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02-28-2014 19:27:32

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 Re: Ford 640, lift stuck up in reply to soundguy, 02-28-2014 18:53:01  
Thanks. I assume you are referring to a hydraulic type hose with threaded connections/fittings at each end so I can attach them.

Do you think I could find a standard hose or need to have one made since I am guessing the fittings are different at each end? I know the plug size, but I will have to look at the tractor in the morning to find the fill hole you are talking about.

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02-28-2014 19:47:21

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 Re: Ford 640, lift stuck up in reply to nytx, 02-28-2014 19:27:32  
the top port is pipe thread, and the fill cap under yer left thigh is a bung opening. just cram the hose in there and stuff a rag around it..

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