SOURCE: variable speed doesn't work troy bilt self propelled lawnmower
Cable could be stretched belt could be worn or old, if it has a gear box maybe it slipped a gear or lost some teeth. Do some investigation, Good Luck
SOURCE: Can the steering on a swisher ZT2450a be adjusted steer is too stiff
http://www.northerntool.com/images/downloads/manuals/365472.pdf
Page 10 shows the only adjustment on steering
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Yes. There is an adjustment under the deck that puts more tension on the drive belt. You may need to adjust the left drive forward travel as well.
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