Power Tool Parts: Carbon Brush Holder Unit 638655-7 – Compatible with HR2300, HR2600, HR2601, HR2610
1. Product Identification
Component Type: Carbon brush holder unit (an integrated assembly that houses and secures carbon brushes in a power tool’s motor).
Part Number: 638655-7 (a unique identifier for inventory and compatibility verification).
Application: Replacement part for rotary hammers (heavy-duty drilling/breaking tools) and similar power tools.
2. Compatibility Details
Target Models: Specifically designed for rotary hammer models:
HR2300
HR2600
HR2601
HR2610
Brand Context: These model numbers align with common naming conventions of brands like Bosch, indicating the holder is likely a replacement part for their rotary hammer lines.
3. Core Function
Housing & Positioning: Serves as a protective casing for carbon brushes, ensuring they align precisely with the motor’s commutator. This alignment is critical for stable electrical contact during high-vibration operation (typical of rotary hammers).
Pressure Regulation: Integrates springs to maintain consistent pressure (2.0–2.5kg) between brushes and commutator, compensating for brush wear and preventing excessive sparking.
Electrical Insulation: Made from insulating materials to prevent short circuits between the brush assembly and the tool’s metal motor housing.
4. Key Features
Material: Heat-resistant, glass fiber-reinforced plastic (e.g., PA6+GF) to withstand motor temperatures up to 130°C and resist deformation from vibration.
Design: Custom-fit to the motor housing of HR2300/HR2600/HR2601/HR2610, with precise mounting points and brush slots matching the tools’ original specifications.
Durability: Engineered to endure the intense impact and vibration of rotary hammer operation, reducing the risk of cracks or breakage.
5. Replacement Indicators
Physical damage (cracks, warping, or broken mounting tabs) that compromises brush stability.
Spring failure (loss of tension) leading to poor brush-commutator contact, resulting in weak performance, sparking, or motor stalling.
Wear or corrosion on internal surfaces that affects brush movement.
6. Installation & Maintenance
Must be securely fastened to the motor housing to withstand the tool’s high-impact operation.
When replacing, ensure the new unit’s spring tension matches OEM specifications (2.0–2.5kg) to avoid uneven wear.
Should be replaced alongside worn carbon brushes to ensure optimal performance and longevity.
7. Importance in Tool Performance
Enables reliable current transmission, directly impacting the rotary hammer’s drilling/breaking power.
Protects critical motor components (commutator, rotor) from damage caused by misaligned or loose brushes.
Ensures safe operation by minimizing sparking and overheating risks.
