Genuine Makita SEAL RING — part no. 424034-3. A small but critical sealing ring used in the crank/gear housing assembly of Makita rotary hammers; it keeps grease in and dust and debris out so the internal link/shaft area runs smoothly.
Fits (example models shown in Makita parts diagrams and parts lists): HR4511C and HR4510C (also appears in some Makita listings for HR4501C). Use this part when you’re replacing a worn, cracked or missing seal from the crank/link area.
What you’ll get: one original Makita seal ring (424034-3), listed as a single replacement part in Makita’s parts diagram (item no. 79 in the diagram) and in Makita parts listings. It’s designed to drop into the link/crank housing mating surfaces to restore the original seal.
Why replace it: a damaged seal ring allows lubricant loss and grit ingress, which accelerates wear on bearings, crankshafts and gears — replacing this inexpensive ring can prevent much costlier repairs down the line.
Note: confirm your tool’s model number (typically printed on the housing) before ordering to ensure compatibility with your exact variant; the parts diagram lists this part specifically for the HR4511C and related HR45xx series.
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