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Message: <blockquote data-quote="leaddog" data-source="post: 32340" data-attributes="member: 3336"><p>Yes that is the type of planetary box but it looks to me the weak spot is the seals. It works in such a dirty enviroment that the seals can't keep the dirt out. Alittle dirt in timken bearings and things go bad. Asv says to replace the oil at 50 hrs or no warrenty and change often. It's quite easy to change the oil and this gives you an idea if the seals are going if you start losing oil. It's really hard to keep these out of the mud and such as that is where they really shine. I built a road on one end of my lake with mine and there wasn't any thing else that would get in where I had to go. Right down through the cattails and mud. I had to dig out and move and place over 600yrds of field stone rangeing up to 3tons and then cover with over 1000yrds of sand. It was a fun project and I bought my 4520 just for that but now that I have it I can't get rid of it as I keep finding things to do with it. I knew when I bought it that they were high maint but they are worth it. leaddog</p></blockquote><p></p>