103-9950 PTO Clutch for Toro & Exmark | Replaced by 110-6766

The 103-9950 PTO clutch is part of a Toro and Exmark OEM clutch group that includes 100-6059 and 108-9510. These part numbers refer to the same clutch platform used across multiple zero-turn mower models.

This OEM clutch group directly cross-references to the 110-6766 PTO clutch, which serves as the primary aftermarket replacement.

If your original PTO clutch is stamped with 103-9950, 100-6059, or 108-9510, the correct replacement is the 110-6766 PTO clutch.

Confirm full cross-reference compatibility, including the complete OEM part number cluster and supported mower models, in the 110-6766 PTO clutch fitment guide.

Replaces Part Numbers

The following part numbers belong to the same PTO clutch cross-reference group and use the same replacement platform:

• Toro / Exmark: 103-9950, 100-6059, 108-9510
• Warner: 5219-81, 5219-45, 5219-34A, 5219-58, 5219-63, 5219-66
• Replacement: 110-6766 PTO clutch

Toro Models That Use This PTO Clutch Platform

This clutch group is commonly found on Toro TimeCutter and Titan zero-turn mower platforms. Use the guides below to confirm exact fitment.

TimeCutter SS Series

• SS5000
• SS5060

TimeCutter Z Series

• Z5000
• Z5020
• Z5030
• Z5035
• Z5040
• Z5060
• ZS5000

Titan Series

• Z4800
• Z5200
• ZX5000
• ZX5020

For broader coverage, see our Toro PTO clutch replacement guide.

Compatible Exmark Models

This same clutch platform is also used on select Exmark zero-turn mower models.

• Exmark Phazer
• Exmark Quest
• Exmark Yellow Jacket YJ2348

See full breakdowns in the Exmark PTO clutch guide.

Common Signs of PTO Clutch Failure

• Blades will not engage when PTO switch is activated
• Intermittent engagement or slipping under load
• Burning smell or overheating
• Squealing or grinding noise
• Blades stop in thicker grass
• Visible heat damage or wear

If these symptoms appear, replacing the PTO clutch will restore proper blade engagement and cutting performance.

How to Confirm Fitment

Match the OEM part number stamped on your original PTO clutch.

If your clutch is marked 103-9950, 100-6059, 108-9510, or 110-6766, this replacement group is correct.

If the number is unreadable, use your mower model or contact us for fitment help.

Shop Replacement

110-6766 PTO Clutch

Browse more options in our Toro PTO clutch collection or view all electric PTO clutches.