I am currently prototype testing a single stage planetary gear that is a 5:1 reduction with an input speed/hp of 3500 rpm/1-1/2 hp. It is all steel in construction and is contained in an aluminum housing. This gear was chosen for its small size, low mass and high efficiency. It is being used as a speed reducer between and induction or air motor and a progressing cavity pump. The gear temperature with a continuous duty cycle is higher than I expected however - around 230 F which is 140 F above ambient and 90 F above pumpage temperature. The gear manufacturer (actually distributor) simply recommended "any lithium based grease" with no guidelines on amount etc. The "any lithium based grease" I used seems to oxidize rather quickly at 230 F. Any specific recommendations regarding lubricant type, quantity, aditives etc. for this gear and application would be very much appreciated. Thank you, fti
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