This demonstration guide answers one field question about a bypass rod left in the tow position or a failed belt. Measurements come before parts, and the notes are not a generic equipment FAQ.
Diagnose before replacing parts
Start with bypass-rod position and belt deflection at the transaxle. That reading separates a bypass rod left in the tow position or a failed belt from adjacent faults that share the same complaint.
If the measurement is out of spec, treat the drive belt and bypass rod as the primary path. If it is in spec, do not replace the drive belt and bypass rod just to complete a parts list.
Repair the failed system
The usual correction is the drive belt and bypass rod, 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 bypass rod left in the tow position or a failed belt.
Stop before you make it worse
Do not towing a hydrostatic mower at road speed. That shortcut hides the original measurement and creates a second failure.
If the machine still fails after the drive belt and bypass rod is corrected, convert the visit to a broader diagnosis rather than stacking parts.
Written and published by Ridgeline Small Engine.