48M513 - Replacement Field Coil Stator for Walter Big Buff 120V

Technical Overview of the Walter 48M513 Field Coil

The Walter 48M513 is a precision-engineered field coil designed to serve as the stationary component (stator) in the universal motors of specific Walter Surface Technologies power tools, most notably the 120V Big Buff III finishing tool. In a universal motor, the field coil is responsible for generating the static magnetic field that interacts with the armature to produce torque. This specific unit is wound with high-grade copper wire, coated with a durable enamel insulation to withstand the high thermal and mechanical stresses typical of industrial surface finishing applications.

Electrical integrity is paramount in power tool motors. The 48M513 is manufactured to strict tolerances regarding resistance and inductance, ensuring it pairs perfectly with the corresponding armature. A mismatched or failing field coil can lead to excessive current draw, arcing at the brushes, and eventual motor burnout. This OEM replacement part restores the motor's electromagnetic efficiency, allowing the tool to maintain speed under load—a critical factor when using abrasive drums or buffing wheels that create significant drag.

Installation of the field coil requires disassembly of the tool housing. The unit is designed to fit precisely into the motor housing of compatible Walter tools, ensuring proper alignment with the armature shaft. The laminations are stacked and secured to minimize eddy current losses and reduce vibration. For maintenance professionals and tool repair technicians, using the genuine 48M513 ensures compliance with the manufacturer's safety and performance standards.

Specifications and Compatibility

This field coil is rated for 120V AC operation. It is the direct replacement for the original part found in 120V versions of the Walter Big Buff III (Model 6265) and potentially other related finishing tools in the Walter lineup. It is not compatible with 240V models. Technicians should verify the tool's model number and voltage rating before installation to prevent electrical damage.