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Old 04-22-2011, 02:17 PM
shortster shortster is offline
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Woods Grasshopper Hydro oil? 5120

I have an older Woods 5120 Mow n Machine ser # 337732. I want to change the oil in my hydro units. I can't seem to find the perfect answer to my question of what oil should be used. I don't have a local dealer in my area. The mower is going to be used for my yard only, about one acre. If I can use a standard off the shelve oil I will do an oil change each spring. I'm not sure what to call the hydro unit. I see gemini and eaton mentioned. Woods tells me to use 71178 hydrostatic oil. Any help?
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Old 04-22-2011, 09:11 PM
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Mowingman Mowingman is offline
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for the Gemini type transmissions, you can use DTE 18M hydraulic oil. If that is not available locally, you may also use DTE 26 hydraulic oil.
For the G2 transmissions, use Mobil 15w50 synthetic oil.
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Old 04-23-2011, 10:22 AM
shortster shortster is offline
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Mowingman, thanks for the reply. I guess that's part of the question. I don't know what unit I have. Is there any way to get that info from the units?
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Old 04-23-2011, 10:30 AM
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If it helps to id these, they have a plastic reservoir on the top with a plastic screw on cap. The filters are below the reservoir. The units are combined as a pump and drive. If that makes sense.
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Old 04-23-2011, 11:29 AM
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The Gemini unit is an "all in one" unit. If it is a Gemini hydro system, there will be one, fairly large hydro pump/motor housing on each side of the machine, under the seat area.
If it is a G1 or G2 system, it will have separate wheel motors and pumps. so, you will have a hydro pump and a hydro motor on each side of the machine. The hydro pumps will be belt driven and each side of the machine will have a wheel motor right behind each drive tire.
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Old 04-24-2011, 09:10 AM
shortster shortster is offline
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sounds like I have the gemini style pumps. Thanks for all the help.
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Old 04-29-2011, 09:03 AM
shortster shortster is offline
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after doing some research, I have found that the DTE18M is no longer available from Mobile. This is now called DTE10 Ultra. I talked with our local Grasshopper dealer regarding the oil. He said they have been putting the DTE26 in the older Gemini units for years. It's cheap and works. The DTE10 Ultra is a 100 viscosity. The DTE26 is 68 viscosity. He said to change it out after 500 hours.
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