504 serial number

Evan From Iowa · Jul 13, 2012

I'm trying to figure out what the letters y-ff mean on my serial number. It's a 1963 (sn 4662) and these letters follow the serial number. Thanks for the help

Red Mercury · Jul 14, 2012

This is taken from my 504 parts manual:
Y=12 Gal./minute hydraulic pump.
FF=4.5 Gal./minute hydraulic pump.
I have a 504 utility that has the same set up. It appears the 12GPM pump is for the power steering and auxiliary hydraulics controls for the loader. The 4.5GPM pump is for the 3 point hitch. According to the parts manual, higher capacity pumps were available. For example if the tractor had a backhoe attachment then it would have a 7GPM pump instead of the 4.5GPM. Is your tractor a 504 International (utility) and does it have a loader as well?

Evan From Iowa · Jul 14, 2012

Thanks, it doesn't have a loader.

504 serial number

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