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How can I adjust the drive on challenge CPLM lawnmower?

This year the self drive on my Challenge CPLM4637S lawn mower has ceased to work. I now have to push it as it still cuts well. How can I adjust the drive to make it work again. Apparently no longer any Power Devil back up
Chris, July 2012
link Click here to see other fixes for Challenge CPLM4637S.