Ford 640 with Dearborn loader, arms drift

Road_Work

New User
Ladies and gentlemen of the forum, greetings.

I have a 1957 Ford 640 with a 19-97 Dearborn loader (series 703 New Holland). It mostly works (the lights and wiring are shot), and ran well all last year. But recently, the loader has some issues. The arms will not hold a load up, and barely stays put without anything in the bucket. The bucket is working with no problems, but the arms are drifting down.

Another symptom is that the engine has to be brought up to almost maximum rev, for the Arms to lift anything. This seems to have gotten worse gradually. I should also point out, I have limited experience with hydraulics, beyond the basic physics.

So I figured that at the very least, the Loader Hydraulic oil needed to be replaced, it came out very dirty-Black, and that the oil filter should also go. The previous owner could not locate a replacement for the original filter and put in a substitute rated for 3000 psi, and 25 GPM. The 19-97 loader has an operating press of 1800 PSI, and 11.5 GPM. Parts for this Oil Filter are not available anymore, so I am looking to find another suitable replacement. Thanks in advance for any suggestions.

The User manual, and the Service Parts Catalog are available at the New Holland web site. Who knew virtual paper was so expensive? Any way, the documents are fairly clear, that this model of loader is no longer serviced by NH.

I also suspect that the Control valves and the lift cylinders are in need of a rebuild. This is going to become expensive fast. Is rebuilding this Loader worth the cost, versus a modern replacement? I really like the idea of keeping this machine original, but first, it has to work.

Thank you for your comments, suggestions, and "glad that ain't my hunk-O-rust" references.
a192947.jpg
 
Could be the cylinder and or the valve them self. Either one will cause it. But since you said you have to have high RPM to lift much to me says cylinder by passing. Or that and the pump getting weak
 
Cylinders are the best place to start since they are 2 way. When leaking by pistons it will take more fluid to raise and keep up. The parts for cyls are avaible your local hyd shop. Take them with you and or rod /piston assembly. They can match them. I do this day in and day out as my "day job".
 
Like others have stated, 2 way cylinders are neither expensive nor difficult to rebuild and most likely your problem.

I wouldn't might having that 'hunk-O-rust' in my yard.
 
guys have you covered on your question.
Just dropped in to say...nice tractor.
good model, decent shape, weights, power steering..
...wish I would have seen it first :)

old tractor loaders will get the job done,
but....be nice to it.
pretty big bucket for a little tractor.
Even with your power steering, don't pick up a heaping load of wet dirt.....make 2 trips....your front end will thank you
 

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