Stihl 090G gearbox maintenance

[Overlooker]

I recently acquired a Stihl 090G chainsaw and have questions about maintaining the gearbox. I found instructions online that say the gearbox needs to be opened, drained, leaned, and refilled every six months. I don't know the history for the saw. Should I go ahead and do the maintenance, or can I tell by looking at the oil whether it really needs it? I would appreciate input from anybody with experience with gear-drive Stihls. The saw is in great condition, with minimal signs of use. I don't want to mess it up by not properly caring for it.

 

[cus_deluxe]

certainly worth checking out. just dont want a bunch of water in there. i assume they mean 6 months of regular use, so for the average person im sure the oil would be good for several years

 

[Overlooker]

Whether I keep the saw or sell it, I'll probably sleep better if I take that gearbox apart and see what's inside. I hope I don't need to come up with a new gasket to put it back together!

 

[scallywag]

I hope I don't need to come up with a new gasket to put it back together!

New gear case gaskets are available on ebay.......https://www.ebay.com.au/itm/STIHL-090-G-Gearbox-Oil-Tank-Gasket-/183672754474

 

[Overlooker]

Thanks!

 

[scallywag]

Thanks!

Don't use gear oil when refilling as it will eat the friction surface off the clutch shoes.

 

[Overlooker]

As I remember, it calls for sae 30 oil. Is that appropriate?

 

[ltm13506.1]

I didn't understand well, is the clutch in direct contact with the transmission oil? or does it have the metallic cover that prevents the bath?

 

[ltm13506.1]

I am looking for a gasket for the transmission side, who sells these gaskets at reasonable prices?