Re: Farmall 504 hydraulic

Posted by Hugh MacKay on January 03, 2007 at 03:36:26 from (216.208.58.155):

In Reply to: Farmall 504 hydraulic posted by gwill on January 02, 2007 at 11:47:59:

gwill: The 17 gpm pump will not lift anymore than the 12 gpm pump, it only does it faster. On a loader, most of the time those extra gpm will give you an advantage especially when your doing both lift and bucket function at the same time. Quite often on a lift the added gpm will give you that extra snap you need to break loose material from pile. The 17 gpm pump will also be quite beneficial when crowding the loader into pile and lifting at same time.

However on a brute force lift the 17 gpm pump will not lift anymore. KB mentioned you might try increased presure in you relief valve. I've been there and done that, don't waste your time. I'm not sure if 504 has the same external high presure hydraulic line from pump to to relief and control valves as 560. If it has, here is what I have done, install a double spool control valve with power beyond capability and higher presure relief than tractor system. Go directly from pump to the added valve, then outlet from valve continues into tractor regular system.

I did this with both Farmalls 300 and 560. 300 had an optional pump, forget but think it was 12 gpm. My 560 had 17 gpm pump. I wouldn't go more than 500psi higher than tractor system, and even with that I'd be damn careful. You can be hard on pump, you will ocasionally hear it squeal. Basically it will talk to you.

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