If you are looking for a , tell me which section of the tool (e.g., the chuck , motor , or switch ) is failing so I can find the exact part number for you. Operations Manual - SID 4-A22

Cordless impact driver (22V) Battery platform: Hilti Nuron (22V) – Note: SID 4‑A22 uses older 22V batteries; newer is SID 4‑22 with Nuron. Common part sources: Hilti online spare parts catalog, Hilti Service Center, or authorized distributors.

: Includes a variable speed trigger (control switch) and a torque selector button with multiple speed/torque settings.