Original Makita crank shaft — part no. 321954-1. Precision replacement crankshaft for Makita demolition hammers in the HM0810; listed as the crank shaft (item 018) in Makita’s HM0810 parts diagram.
Fits Makita HM0810 and compatible variants such as HM0810B and HM0810T.
Details you’ll need for repair: this is the machined crank shaft that drives the piston/striker assembly and interfaces directly with the connecting rod (item 016), needle bearings (1212 / 1210), a Woodruff key (4), retaining ring R-47 and nearby seals/washers (oil seal "17" and flat washer "24" as shown in the exploded parts list). Supplied as a single replacement crank shaft (qty 1) to restore the hammer’s impact mechanism.
If your HM0810-series hammer has broken or excessively worn crank journals or keyways, replacing this original Makita crank shaft returns correct geometry and alignment for the piston and bearings, restoring reliable impact performance.
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