Description
Overview:
The Rotor Pinion Assembly for Hitachi/Hikoki cordless impact wrenches is a genuine replacement for the WR18DBDL2 and WR36DC models. This factory-assembled unit combines a precision-balanced rotor and an integrated drive pinion to transfer motor power to the hammer mechanism efficiently. Built with a laminated steel core and a hardened steel pinion, it is engineered to cope with the high rotational speeds and shock loads common in impact tools. Using the correct genuine assembly helps maintain performance, torque delivery, and battery efficiency, while reducing vibration and noise. It is a direct-fit component that restores smooth operation when the original rotor or pinion has worn, chipped, or become heat-damaged through heavy use.
Key Features:
- Genuine Hitachi/Hikoki part for assured compatibility and reliability
- Integrated rotor and pinion for correct mesh and smooth power transfer
- Hardened steel pinion teeth for wear resistance under impact loading
- Precision-balanced rotor to help minimise vibration and motor wear
- Direct replacement for OEM 361055; no modifications required
- Supports consistent torque output and impact performance
- Durable materials chosen for frequent professional and DIY use
- Helps reduce downtime with straightforward installation
- Suitable for routine maintenance or full motor refurbishment
- Maintains tool safety by preserving designed clearances and tolerances
Typical Applications:
Used during servicing or repair when the tool shows loss of power, rough running, excessive sparking or heat, unusual gear noise, or visible pinion damage. Ideal for workshops, site maintenance, and mobile repair where rapid turnaround is needed to keep cordless impact wrenches operating efficiently on fastening, assembly, structural steel, and machinery tasks.
Also known as:
Rotor gear assembly, motor rotor with pinion, drive pinion rotor, rotor gear set, pinion rotor assembly, motor drive rotor, impact wrench rotor/pinion unit.
Fits Models:
WR18DBDL2, WR36DC
Alternate Part Numbers:
361055
Product Specifications
| L&S Part No. | HKK361055 |
|---|---|
| Part Type | Genuine Part |
| Manufacturer | Hitachi/Hikoki |
| OEM No. | 361055 |
| Unit of Sale | 1 |
| Applications | WR18DBDL2 |
| Machine Type | Impact Wrench |
| Fits Brands | Hikoki |
| Fits Models | WR18DBDL2 |
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