Original Makita 233180-9 — Compression Spring 3. This is the genuine Makita compression spring (part no. 233180-9) used in the hammer assembly of Makita rotary hammers. It’s sold as a single replacement spring and is listed in Makita parts diagrams as “Compression Spring 3.”

Fit and purpose: Designed for use in Makita rotary hammers, this spring is compatible with models such as HR4000C, HR4500C and HR5001C and restores the correct preload and return action within the hammer/impact mechanism. Ideal when a worn or broken spring is causing lost hammering performance or irregular impact action.

Quick details: part number 233180-9; listed in Makita service/parts lists for the HR4000C/HR4500C family; supplied individually as the original Makita replacement compression spring to maintain factory fit and function.