That was back during the production period of these tractors that they "upgraded" to the donuts. The donuts were the best they had until the oval filter you mention. I got tired of changing the donuts and bought an aftermarket filter upgrade. It contains a big oval filter and a spacer plate. I have a 504 diesel with a Koyker loader and a fresh 17 GPM pump along with the 4.5 GPM hitch pump. Even with fresh donuts (14 GPM flow when new), my pumps sounded like they were cavitating and they were. The Allied Precision kit ELIMINATED my hydraulic issues. I also bought a spare filter. After a month or so, my pumps were squaling again... Changed the filter and have not looked back. Think the oval filter caught more debris than the donuts and filled quickly. This filter has been on about 8 months and is now restricted yet.
Donuts vs. Large Oval
Birdseye view of Donuts vs. Large Oval
Donut Assembly vs. Large Oval
Whats this?
Gasket failure of donut filter housing.
Installed
Finished!
Link to Allied Precision: Best investment you can make for your 504.
Price includes spacer, bolts, studs, filter, and two gaskets. Only one
is required for a filter change (included with new filter).
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