603545 PTO Clutch Replacement for Hustler Big Dog | Replaces 601325, 5219-90

Overview

This Hustler PTO clutch 603545 replacement also replaces part numbers 603545K, 601325, and 601325K. Designed for an exact OEM-spec fit on Hustler and Big Dog mower platforms, this electric PTO clutch delivers smooth blade engagement, consistent torque transfer, and reliable long-term performance.

Commonly used on Hustler TrimStar walk-behind mowers and Big Dog T Series zero-turn platforms, this clutch provides dependable PTO engagement for consistent cutting performance in demanding mowing conditions.

Built with a 6.30-inch pulley, 1-inch crankshaft bore, and CCW rotation, this clutch is engineered for reliable operation at speeds up to 3600 RPM. High-temperature sealed bearings and an encapsulated electromagnetic coil help protect the assembly from heat, vibration, and debris.

Key Features

• Direct OEM replacement electric PTO clutch assembly
• Pulley Diameter: 6.30 inches
• Crankshaft Size: 1 inch
• Rotation: CCW (counter-clockwise)
• Operating Speed: Up to 3600 RPM
• Thermal cutoff protection to help prevent overheating
• Encapsulated electromagnetic coil for reliable engagement
• High and low temperature bearings for consistent performance
• Fully assembled and ready to install

Compatible With These Brands & Model Series

This PTO clutch fits Hustler and Big Dog mower platforms using the same specification.

• Hustler TrimStar Series
• Big Dog T Series Zero-Turn Mowers

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

Replaces OEM Part Numbers

• Hustler / Big Dog: 603545, 603545K, 601325, 601325K

Aftermarket Cross-Reference Numbers

• Warner: 5219-90

What’s Included

• Complete electric PTO clutch assembly
• Pre-installed wiring connector with pigtail and diode
• Factory-balanced 6.30" pulley

Why Buy From PTO Direct USA?

• Fast USA shipping
• OEM-spec fitment guarantee
• 1-year warranty
• Premium PTO Direct USA product images for visual confirmation
• Trusted supplier for homeowners and professionals

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