Description
Overview:
The Gearcase Sa is the front gearbox housing for select DeWalt hammer drills. Built from robust metal (cast alloy), it encloses and supports the drive gears and hammer mechanism, keeping everything aligned under load and protecting components from dust and impact. This genuine DeWalt/Black & Decker part is a direct replacement for OEM No. N077817 and is intended to restore correct gear support and smooth running. It is purpose-made for DeWalt high‐performance hammer drills, including the D21570K Type 1 and DWD522KS Type 1, and is suitable for professional and DIY use. Fitted correctly, the gearcase helps maintain torque transfer, reduces premature wear on mating parts, and extends tool service life during repetitive drilling in masonry, wood, and metal.
Key Features:
- Genuine DeWalt part (OEM N077817) for assured fit and function
- Durable cast-metal housing for long service in demanding site conditions
- Precisely machined interfaces to maintain gear alignment and smooth operation
- Direct replacement to refresh worn or damaged housings and restore performance
- Compatible with specified Type 1 models for straightforward identification
- Helps shield internal gears from debris and impact during hammer drilling
- Designed to handle high torque and percussive loads typical of hammer drills
- Clean, factory-style fitment with existing screws and seals from the host tool
- Supports routine maintenance schedules to minimise downtime
- Suitable for trade, workshop, and onsite repairs using standard hand tools
Typical Applications:
Used to replace a cracked, worn, or distorted gear housing on compatible DeWalt hammer drills. Ideal for tools that see frequent masonry drilling, anchor fixing, and heavy duty site work. Helps restore smooth gear engagement and reliable hammer action in tasks such as drilling into brick, block, concrete, and stone, as well as general-purpose drilling in wood and metal.
Also known as:
Gearbox housing, transmission housing, gearbox casing, front gearcase, nose housing, drive head housing, hammer drill gearbox, gear head casing.
Fits Models:
D21570K (Type 1)
DWD522KS (Type 1)
DWD530KS
Alternate Part Numbers:
N077817
Product Specifications
| L&S Part No. | N077817 |
|---|---|
| Part Type | Genuine Part |
| Manufacturer | Black & Decker |
| OEM No. | 077817 |
| Unit of Sale | 1 |
| Machine Type | Hammer Drill |
| Fits Brands | Black & Decker, DeWalt |
| Key Features | - Genuine DeWalt part (OEM N077817) ensures correct fit - Durable cast-metal housing for demanding conditions - Compatible with D21570K and DWD522KS Type 1 models - Shields internal gears from debris and impact - Supports high torque and percussive loads in hammer drills |
| Fits Models | D21570K Type 1 | DWD522KS Type 1 | DWD530KS Type 1 |
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