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3 Point Lift Hiccups

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Tommy D.

05-12-1999 12:13:35

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I have a 64 Ford 4000 (8x1 series part 2). I noticed last weekend that the lift would slowly fall about 1/4 inch, then suddenly jump back up. This happened in a steady, even rythm, and was noticed with a load (Woods Fin. Mower) on the lift.

Do I have lift problems on the way? Is there anything I can do now to help/prevent more problems, such as new fluid, etc. I changed the fluid last fall ands used the Ford 134, recommended by the local dealer.

Any and all guidance is greatly appreciated.

Tommy D.
Dalton, Ga.

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Bern

05-12-1999 16:55:54

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Re: 3 Point Lift Hiccups in reply to Tommy D., 05-12-1999 12:13:35

You have an internal leak. Possible problem areas listed from most to least likely are as follows: leaking lift piston seal, worn control valve spool and/or bushing, leaking check valve, leakage past the unload valve end plug, and a leaking lift cylinder safety valve. Problem is most likely a worn lift piston seal, but a quick way to check for control valve spool leakage is to raise implement all the way up and then shut off the engine. If the control valve is the sole reason for the leakdown, you will notice the implement settling slower and slower as it goes down. If it leaks down at a constant rate all the way to the ground, I would suspect any of the other listed possibilities. There is nothing you can do externally to correct any of these conditions; problem will eventually get worse as time goes on. If I were you I would pull lift cover and go after lift piston seal first. There is a way a person can look through the access cover in the rear axle housing with a mirror and flashlight to see where the leak is coming from, but for most of the above listed possibilities one would have to know exactly what he's looking at.

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Tommy D.

05-14-1999 11:08:40

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Re: Re: 3 Point Lift Hiccups in reply to Bern, 05-12-1999 16:55:54

Bern,

Thanks so much! Found an I&T Manual yesterday & looked it up. I&T doesn't have much detail, however.

Are you talking about the O-Ring and Backing Ring on the hydraulic piston which actually raises the arms? This would be located under the plate covering the hydraulic resivoir under the seat?
The manual said "look throught the filler hole to determine if the piston seal is leaking...", then called this an "O-Ring and Backing Ring" in the diagram. Also, would I be looking for fluid escaping from the cylinder containing this piston?

By the way, my valve cover gasket is leaking. Someone here on this board said I could get it off without removing the fuel tank & hood. I hope so, because they are a pain.

Thanks again for your help.

Tommy D...

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Bern

05-14-1999 17:16:24

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Re: Re: Re: 3 Point Lift Hiccups in reply to Tommy D., 05-14-1999 11:08:40

Tommy, I have an I&T manual here #FO-20. I'm on page 128, figure FO264. The lift piston seal is reference # 55 and 56. These are the lift piston seals I was referring to, and yes, you do want to watch the end of the cylinder #35 to see if oil is coming out. Paragraph 306 on page 124 describes other points to look for if you have the hiccups; pretty much the same things I covered in my last post.

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