I have a Kohler Model K 2 K.W it runs great but does not put out any power. I want to check the brushes but can not get the large cover off.I removed the 4 screws in the middle of the cover but there seems to be something else holding it on. Any help would be appreciated,Im knew to these and need all the help I can get. What would be other things I should check to get this thing to produce electricity? Thanks in advance,Craig.