Re: Farmall 504 hydraulic problems

Posted by Joe Evans on April 12, 2004 at 21:00:49 from (209.41.235.40):

In Reply to: Farmall 504 hydraulic problems posted by Tom on April 12, 2004 at 09:51:10:

Tom: you really need to arm yourself with a good manual for your tractor.

I'm not comfortable talking about a 504's system. I just went through a 460's system-I'm faily versed on that. Just don't know how much different the newer series tractors are from their Daddy's. We have a 504, and it sure does look a lot different than the 460's at least as far as where the components are located.

If the problems you describe were on a 60 series tractor, I would agree that the relief is bad, but not entirely so. There's just not much that can go wrong. I suspect there's a chunk of crud partially holding the relief open, or the relief may not be allowed to seat fully (close) maybe from a scored bore or whatever.

With a no load condition--raising the loader with no weight--not much pressure is required for this, so most of the oil would rather go to the path of least resistance (a loader with no weight in the bucket)than through a partially cracked relief valve. With a weighted bucket, most of the oil would rather go screaming through the partially cracked open relief.

These symptoms should be the same with your fast hitch--no load,fine; with weight, squealing.

I looked at our 504's system layout this past week comparing it to our 460. It appears the relief/control block is located on (under) the draft control quadrant. The 460's hydraulic vitals are easy to access. Looks like the 504's would be the same.

Don't overlook the simple fact that you may have a pump that has seen better days. If internal pump rotor clearances have increased due to wear, the pump will develop enough pressure to lift an empty loader, but will holler at you when it's required to work hard due to oil bypassing internally. Our 460's pump was this way--it would barely lift an unweighted fast hitch.

I'm just speculating. Get a manual if you don't already have one.

Follow Ups:

• Re: Re: Farmall 504 hydraulic problems Tom Dennis 07:07:45 04/13/04 (1)
  • Re: Re: Re: Farmall 504 hydraulic problems Joe Evans 10:58:56 04/13/04 (0)

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