Reason is the cover is a stamped steel product. It is not machined flat.
When you are fastening non machined parts together, there is potential for the parts to shift and settle, and the head of the bolt to dig in under load, which can relieve some of the initial bolt torque. The lock washer is there to somewhat help prevent the bolt from losing its grip.
But split ring lock washers can actually cause a different problem, splitting and squeezing out! If you want to use split ring lock washers, be sure to get a good grade, not the hardware store bulk bin variety.
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Today's Featured Article - Choosin, Mounting and Using a Bush Hog Type Mower - by Francis Robinson. Looking around at my new neighbors, most of whom are city raised and have recently acquired their first mini-farms of five to fifteen acres and also from reading questions ask at various discussion sites on the web it is frighteningly apparent that a great many guys (and a few gals) are learning by trial and error and mostly error how to use a very dangerous piece of farm equipment. It is also very apparent that these folks are getting a lot of very poor and often very dangerous advice fro
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