SOURCE: Troy Bilt Self Propelled Lawnmower drive belt
belts usually come off for a few reasons.
They become loose...stretch or the tensioner moves, Make sure that none of the tightening bolds are slipping. You can dab them with a bit of paint.
when the pulleys are not in alignment or crooked or bent. Eyeball the path from one pulley to another, also make sure the tensioner is in alignment and there are no other obstructions.
good, high quality belts are required, and they must be real drive belts...not regular v belts. If there is a way to watch the belt in operation you can usually see what's going wrong.
On my lawnmower I had to grind some metal away where the belt went from the motor to the transmission. Good luck
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: troybuilt self propelled mower will
The carburetor is dirty and/or the diaphram needs replaced.
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