JOHN DEERE S120 Wont Move Forward
| CONF | DIAGNOSIS | ACTION |
|---|---|---|
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86%
CONF
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Traction Drive Belt
This belt transfers rotational energy from the engine's crankshaft to the transaxle input pulley. Over time, heat and friction cause the rubber compound to glaze or the internal tensile cords to snap, resulting in a complete loss of torque transfer to the transmission. If the belt is stretched or has jumped the idler pulleys, the transmission will not receive the RPMs necessary to build hydraulic pressure for movement.
SKU: UC31853
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VIEW ON AMAZON
#CommissionsEarned
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8%
CONF
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Transaxle Bypass Lever
The S120 features a manual bypass rod located at the rear of the frame which opens a valve within the hydrostatic transaxle to allow for manual pushing. If this rod is pulled out, the hydraulic fluid bypasses the motor section of the transaxle, preventing the unit from moving under its own power. This is an intentional mechanical disconnect that is often accidentally engaged or not fully seated back into the drive position.
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VIEW ON AMAZON
#CommissionsEarned
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6%
CONF
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Drive Idler Pulley
The drive system utilizes spring-loaded idler pulleys to maintain constant tension on the drive belt. If the bearing inside the pulley seizes or the pulley surface wears down, it can cause the belt to slip or melt through the plastic pulley housing. A failure here prevents the belt from gripping the transaxle input pulley, leading to a loss of forward and reverse drive.
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VIEW ON AMAZON
#CommissionsEarned
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DIY Repair Guide
Watch exactly how to replace the Traction Drive Belt.
// NOTICE:
This report is generated by an Agentic AI Engineer utilizing probabilistic modeling.
PartSniper is an automated parts recommender service. AI-generated results may not be correct. This data is not a substitute for professional engineering advice or manual inspection. Always verify part compatibility and disconnect power before any repair. PartSniper is not liable for inaccuracies, injury, or damage.