1A646025810 Transmission Drive Pulley 4.25" OD For Tuff Torq K46 K57 Husqvarna

Transmission Drive Pulley for Tuff Torq K46/K57 and Husqvarna

This transmission drive pulley (OEM cross-reference 1A646025810) transfers engine power to the hydrostatic transaxle and maintains belt grip on select Tuff Torq K46/K57-equipped Husqvarna tractors.

Overview

The transmission drive pulley mounts to the engine crankshaft and drives the ground-drive belt, delivering smooth speed and direction changes on Tuff Torq K46 and K57 hydro transaxles commonly found in Husqvarna lawn and garden tractors. Replacing a worn pulley restores belt alignment and prevents sudden power loss, making it an essential component for reliable mowing performance.

Built For Performance

• 4.25-inch outer diameter matches OEM drive pulley dimensions
• Precision-cut V-groove provides consistent belt seating and reduced slip
• Direct replacement for Tuff Torq K46 and K57 transaxle pulleys
• Balanced steel construction minimizes vibration and extends belt life
• Hardened wear surfaces resist grooving under heavy load

Fits These Machines

• for Tuff Torq K46 transaxle
• for Tuff Torq K57 transaxle
• for Husqvarna tractors equipped with K46 or K57

On-The-Job Use

• Lawn mowing on residential properties
• Hauling yard debris with a tow-behind cart
• Operating a belt-driven snow blower in winter
• Pulling a dethatcher or aerator for seasonal turf care

Specs At A Glance

Good To Know

Q: Will this pulley work on all Husqvarna models? A: It fits select Husqvarna tractors that use a Tuff Torq K46 or K57 hydrostatic transaxle; verify your transaxle model before purchasing.

Q: Does the pulley come with a retaining bolt? A: The assembly does not include a retaining bolt; reuse the existing bolt from your original pulley or source the correct size separately.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.