Genuine Makita 136138-6 — Sprocket Cover Assembly
Restore the drive-side protection on your Makita cordless chainsaw with the original Makita 136138-6 sprocket cover assembly. This factory cover houses the drive sprocket area and fasteners (it’s supplied as an assembly that includes the guide plate, flange nut and nut cover), so you can replace the worn or cracked cover and get the chain/tensioning area sealed and protected again.
Fits several Makita 36 V/18V×2 cordless chainsaw models DUC-series saws such as DUC256, DUC306, DUC256 , DUC356 and DUC406 (and their region-specific variants). Use this part when the plastic cover around the drive sprocket is damaged, the nut cover is broken, or debris is getting into the sprocket area.
What you’re getting: the complete sprocket-cover assembly as listed in Makita parts diagrams (it replaces item no. 70 in the parts breakdown and is sold as a single unit that includes the small subcomponents called out in the diagram). It’s a direct-fit Makita part designed to reinstall onto the factory mounting points with the original flange nut and nut cover already accounted for.
Helpful context (model guide-bar lengths so you can confirm fit): typical guide-bar lengths for those models are approximately — DUC256 ≈ 250 mm, DUC306 ≈ 300 mm, DUC356 ≈ 350 mm, DUC406 ≈ 400 mm; That aligns with the chainsaw models that list 136138-6 in their parts breakdowns.
To protect your new gear assembly from immediate premature wear, you must thoroughly clean out any old metal shavings from the gear casing and apply fresh genuine Makita mechanical tool grease during reassembly. We also highly recommend replacing the front Oil Seal (213228-3) at the same time to prevent internal grease leaks."
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