On my cubs that originally came equipped with sediment bowls, I disassemble them, thouroughly clean them, and re-assemble at least once a year. Its very simple to do, and in my opinion if all is kosher in the sediment bowl, and the tank is clean, a filter is not required.
On my newer cubs like my 82 series, they relied upon the screen in the pickup tube to filter contaminants, but like many have said this can clog up or get holes in it, etc..I always ad a high flow filter to these ones.
By hi flow, I mean there is simply a brass screen inside of the filter, similar to a sediment bowl, and you can easily see through it while peering in either end. I picked up a bunch of these from my local IH dealer several years ago (they are red in color..pancake style)
Jeff (teet)
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