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JD 6620 combine - oil in gear portion of transmission

A

andy r

Member
This is interesting. John Deere 6620 hydrostatic owner's manual says the gear portion of the transmission uses HyGard (Deere's hydraulic/transmission fluid). HyGard is about like motor oil in viscosity. Picked up some low viscosity oil for the hydro part of the transmission at the dealer. While there I ask the service people at the dealership about the gear portion of the transmission. They said it uses 85 - 90 wt. I said no, the manual says HyGard. Service manager said when they come in here they leave with 85 - 90 wt. and most of them running around out there have 85 - 90 wt. in them. He looked it up and sure enough it says HyGard. So what should it have in it???? I know there is an oil pump in the gear portion of the transmission. Seems like it would be hard to get 85 - 90 wt. into a pump if it was really cold let alone pump it to the top of the transmission. What should I use?????? Thanks.
 
I can't speak for the John Deere combine but on my Case IH 1660 they recommend Hy-tran plus oil. Same as what goes in the hydraulic system. Seems to be working fine after nearly 30 years and 4000 hours so I'll stick with Hy-tran plus.
 
WHY are you doubting the Operator's Manual vs. some (likely young) dealership folks that likely view a 6620 as obsolete or an antique?

Was in that area of an 8820 today, sure was no 90 gear oil in there!
 
This guy in the service department wasn't young. Probably 60ish. Been working there for 18 years plus ran John Deere 6620's at home. Just wondered if there was some change over time as to what is OK to fill the gear part of the transmission with.
 
I always have ran Hyguard in my 20 series combines. There is a pump in the transmission that would struggle in cold weather to pump gear oil.
 
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