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If they're "sealed", any grease in there should not escape so you shouldn't need to do anything.
On the Stihl HSA86, I just remove the plastic bottom "plate", remove the 5 bolts and top plate wit the bearing in it, remove the top connecting arm, remove the wheel that drives the connecting arms................. then coat everything with a good dose of grease............ I use the black grease that contains Molybdenum disulphide which seems to work well. I seem to remember the manual saying it should be done every 25 hours which I roughly stick to. The gearbox is noticeably quieter once it's been re-greased.
i use the white type of grease on my stihl battery ones, just once in a while when i remember. most battery strimmer heads don't need greasing if they are the type with the motor at the bottom of the shaft as opposed to those with a top mounted motor which have a drive shaft
A useful little tip I've found with my HSA86.................... the gearbox used to fill up with bits of debris from whatever I was cutting. If you use a small blob of silicone sealant on top of the blades where they leave the casing... then replace the black top........... this blcoks the small gap and solves the problem.
I grease my pellenc every 8 hours... that's what they tell me to do anyway!!
Had to do a double take of that post on my mobile ..... 😬
😂😂😂😂....