Makita 213666-9 Spare Part - O RING 52 HM1800
Original Makita 213666-9 — O‑Ring 52. A genuine Makita replacement seal engineered for the HM-series demolition hammers, this O‑ring restores the cylinder/barrel sealing that keeps impact performance and lubrication where they belong. It’s listed by Makita as O‑RING 52 (part no. 213666-9).
What you’re getting: a single Makita O‑ring (52 mm size as shown in Makita parts lists) made from a durable elastomer designed for the hammer’s pneumatic/oil sealing points. On the HM1800/HM1801/HM1810 service drawings the 213666-9 ring sits with the cylinder liner assembly (so it’s the correct seal to replace when the barrel/cylinder starts leaking, losing power, or picking up excess dust). Sold individually and ready to drop in as a direct replacement for the part called out on those models’ parts diagrams.
Quick notes: match your tool’s model number (HM1800, HM1801 or HM1810) to the parts diagram before fitting, and replace any adjacent seals or grease per the service instructions if they show wear. This is the original Makita part number 213666-9 so you’re restoring the tool to factory specification.
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Compatible models this part will fit:
