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 - Product Review: Black Tire Paint - by Staff. I have been fortunate in that two of my tractors have had rear tires that were in great shape when I bought the tractor. My model "H" even had the old style fronts with plenty of tread. My "L" fronts were mismatched Sears Guardsman snow tires, which I promptly tossed. Well, although these tires were in good shape as far as tread was concerned, they looked real sad. All were flat, but new tubes fixed that. In addition to years and years of scuffing and fading, they had paint splattered on
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