On a level suface, the oil level should not be above the check plug on the side. It sounds like it was overserviced and possibly still is. I never saw a gearbox on a Rotary Cutter with a drain plug on the bottom. On mine, there is no requirement to ever change the oil. Just check it by removing the small 1/8" side plug and if it needs oil, remove the top 1/2" fill plug and add 90w gear oil until it starts to run out the check plug. I've been running my 6' cutter since 1998 and have never had to add any oil to it. It's still running with the oil from the factory. I've cut 100s and 100s of acres with it. When you tip the mower upside down you're inverting the gearbox, something I've never done. I do the sharpening with it lifted up by the tractor with safety jacks under it. Use a rotary grinder. Replaced the blades once. I find I get a much better cut after the leading edges of the blades have become quite jagged from hitting rocks. Just sharpen the bluntness once in a while. Anyway, if you have a drain plug, why don't you drain it and then refill it to the proper level and then go out and cut. Don't tip it upside down with oil in the gearbox.
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Today's Featured Article - Fasteners: The Nuts and Bolts of Nuts and Bolts - by Curtis Von Fange. The nuts and bolts of nuts and bolts is an interesting and essential piece of knowledge that applies to our older tractors. An improperly torqued capscrew on an engine head or a shear bolt that is too hard on the driving shaft of a bushog can create havoc and make an expensive and uncalled for repair. Let’s examine the purpose and design of these fasteners in order to ensure their proper use. Fasteners are probably one of the aspects of mechanics that is given the least amount of thought.
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