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The gear oil specs for those boxes are crazy nuts - has to last 20 years! I costs thousands to get your stuff tested to be approved. The market isn't big yet to justify when compared to other markets. Each box takes about 40gl of oil. Getting it up there to change is a bit of an issue. If I was to design it, I would have had a line from ground leve to the top to test, drain and fill the oil.
We do sell some grease for the bearings - to date it works better than anything available.
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Michael D. Holloway
https://simple.m.wikipedia.org/wiki/Michael_D._Holloway
https://5thorderindustry.com/
https://www.amazon.com/s?k=michael+d+holloway&crid=3AWD8RUVY3E2F&sprefix= michael+d+holloway%2Caps%2C136&ref=nb_sb_noss_1
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