103-0665 PTO Clutch Replacement for Toro Z-Master & Exmark Lazer Z | Replaces 2721337, 787366 & More

Overview

This Toro PTO clutch 103-0665 replacement also replaces OEM part numbers 2721337, 1-631732, 1-641300, and 787366. Designed for an exact OEM-spec fit on Toro, Exmark, Husqvarna, and Wheel Horse mower platforms, this electric PTO clutch delivers smooth blade engagement, consistent torque transfer, and reliable long-term mowing performance.

Commonly used on Toro Z-Master, Exmark Lazer Z, and Husqvarna ZTH series commercial mower platforms, this clutch provides dependable PTO engagement for heavy-duty mowing applications.

Built with a 6.10-inch pulley diameter, 1-1/8 inch crankshaft bore, and CW rotation, this clutch is engineered for reliable operation at engine speeds up to 3600 RPM. High-temperature bearings and an encapsulated electromagnetic coil help ensure consistent performance and long service life under demanding conditions.

Key Features

• Direct OEM replacement electric PTO clutch assembly
• Pulley Diameter: 6.10 inches
• Crankshaft Size: 1-1/8 inch
• Rotation: CW (clockwise)
• Operating Speed: Up to 3600 RPM
• Encapsulated electromagnetic coil for reliable engagement
• High-temperature bearings for consistent performance
• Designed for stable operation under load
• Fully assembled and ready to install

Compatible With These Brands & Model Series

This PTO clutch fits Toro, Exmark, Husqvarna, and related commercial mower platforms using the same OEM specification.

• Toro Z-Master Series: Z252L, Z255, Z256, Z257, Z283L, Z286E, Z287L (52", 62", 72" SFS decks)
• Exmark Lazer Z Series
• Husqvarna ZTH Series: ZTH5223A, ZTH5225A, ZTH6125A
• Wheel Horse: Commando 800, RR-532
• Poulan Pro: PR20PH42STA

Fitment can vary by configuration and production year. Always confirm your part number matches one of the numbers listed below.

Replaces OEM Part Numbers

• Toro / Exmark: 103-0665, 103-0501, 1-631732, 1-641300, 631732, 641300, E631732, E633099
• Husqvarna / AYP: 2721337
• Additional: 787366, 787366K, 180265, 070-5035-00

Aftermarket Cross-Reference Numbers

• Warner: 5218-213, 5218-65, 5218-165, 5218-225, 5218-95
• Oregon: 33-115, 33-139, 33-155, 33-188
• STENS: 255-552, 255-535, 255-642, 255-865, 255-120X, 255-803X, 255-553

What’s Included

• Complete electric PTO clutch assembly
• Factory-balanced 6.10" pulley
• Pre-installed high-temperature bearings
• Encapsulated electromagnetic coil
• Plug-and-play wiring connector

Why Buy From PTO Direct USA?

• Fast USA shipping
• OEM-spec fitment guarantee
• 1-year warranty
• Premium PTO Direct USA product images for easy identification
• Trusted replacement supplier for commercial operators and professionals

Need a different fitment? Browse the full electric PTO clutch catalog to see all available replacement options.