Symptoms
- Engine runs normally at any RPM
- Wheels don't turn when the drive pedal is pressed
- May have a freewheel/tow lever engaged
- Worked before, or gradually got weaker before failing completely
Likely causes
- CommonFreewheel or transmission bypass lever engagedThis lever, used for pushing the mower manually, disengages the transmission if left in the wrong position.
- CommonBroken or off-track drive beltThe belt linking the engine to the transmission can snap or slip off its pulleys.
- PossibleLow or leaking transmission fluid (hydrostatic models)Hydrostatic transmissions need adequate fluid to transmit power; a leak causes loss of drive.
- PossibleWorn or failed transmission internallyAfter years of use, the transmission itself may wear out and need replacement.
What to do
- Check for a freewheel/bypass lever near the transmission and make sure it's in the drive (not tow/push) position.
- Turn off the engine and inspect the drive belt path for a broken, off-track, or missing belt.
- For hydrostatic transmissions, check the fluid level per the manual and look for visible leaks or wet spots underneath.
- Reinstall or replace the drive belt if it's broken or worn.
- Top off or replace transmission fluid if low, and check for a leaking seal that needs repair.
- If the transmission is confirmed internally worn, weigh repair cost against the mower's age and value.
Tools and parts
- Wrench set
Riding mower drive beltSearch: “riding mower drive belt”
Hydrostatic transmission fluidSearch: “lawn tractor hydrostatic transmission fluid”
When to call a pro
Hydrostatic transmission repair or replacement is a significant job best handled by a small engine or mower repair shop.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.