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I opened up the gear head on a HT101 pole saw to check the bearing on the sprocket shaft. There was "some" grease in the gear box and am wondering if I should clean out the old grease and regrease the gears. What type of grease should I use, and how much? Do I fill the entire cavity or just cover the gears with a good lithium grease?

With all grease remove you add about a 1/2 oz (generous portion) of good bearing grease like EP2 (high temperature bearing grease) and reseal the gearbox oil resistant silicone sealant. Of course Stihl will recommend their products.

Thanks for the reply. I will do that.