1) Traction drive belt slipping or worn
a) idler pulley not fully engaging
b) cable/lever adjustment
c) spring missing or broken
2) Friction drive disc slipping or worn
a) rust on hexagon shaft not allowing friction disc to move
b) missing or broken engagement spring
3) clevis pins missing or broken on wheels
4) roll pin on drive shaft missing or broken
inside the cover for the gearing mechanisms, chain drives, gears ect.
I’m happy to assist further over the phone at
https://www.6ya.com/expert/rolandw_c013176d62ee17ae
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