This demonstration guide answers one field question about a silent gearbox versus a spinning pulley and stopped auger. Measurements come before parts, and the notes are not a generic equipment FAQ.
Diagnose before replacing parts
Start with pulley motion versus auger motion. That reading separates a silent gearbox versus a spinning pulley and stopped auger from adjacent faults that share the same complaint.
If the measurement is out of spec, treat the belt or gearbox as indicated as the primary path. If it is in spec, do not replace the belt or gearbox as indicated just to complete a parts list.
Repair the failed system
The usual correction is the belt or gearbox as indicated, installed to the documented spec for this complaint.
A demonstration shop records the finding so the next technician is not repeating a guess about a silent gearbox versus a spinning pulley and stopped auger.
Stop before you make it worse
Do not prying the auger with a 2x4 while the machine is in gear. That shortcut hides the original measurement and creates a second failure.
If the machine still fails after the belt or gearbox as indicated is corrected, convert the visit to a broader diagnosis rather than stacking parts.
Written and published by Ridgeline Small Engine.