Dewalt n660685 Gear Assembly Second Reduction

Product Description

The DEWALT n660685 is a second reduction gear assembly used in DEWALT power tools to transfer and reduce rotational speed from the motor stage to the output drive. This internal drivetrain component manages torque multiplication through a secondary gear stage, allowing the tool to deliver the correct output speed and force at the chuck or drive. It is a direct replacement part installed by power tool repair technicians, authorized service centers, or experienced trade professionals performing field repairs on compatible DEWALT tools.

This gear assembly is intended for service and repair applications where the second reduction stage has experienced wear, gear tooth damage, or mechanical failure. It fits within the internal gearbox housing of the compatible tool and is typically replaced as part of a drivetrain rebuild. Proper installation requires disassembly of the tool housing and removal of the existing gear stage.

Key Features

• Second reduction gear stage for torque multiplication and speed step-down
• OEM DEWALT replacement part — direct fit for compatible tool models
• Designed for internal gearbox installation within compatible DEWALT power tools
• Supports accurate output speed and torque delivery at the tool drive

Compatibility

Designed as an OEM-style replacement gear assembly for compatible DEWALT power tools requiring second reduction stage service. Refer to your tool model's parts diagram to confirm fitment before ordering.

Installation Notes

Installation should be performed by a qualified power tool repair technician or authorized service center. Disconnect the tool from all power sources and remove the battery pack before beginning disassembly. Full gearbox disassembly is required to access and replace the second reduction gear assembly. Consult the applicable tool service manual for correct reassembly sequence and torque specifications.

Technical Specifications

• Component Type: Second Reduction Gear Assembly

Standard Information

• Brand: DEWALT
• Manufacturer Part Number: n660685