83mercedes 8 #1 Posted January 19, 2022 want to change the trans fluid and from what i read 10w30 ,is that correct and if it is can i use syn ? 1 Share this post Link to post Share on other sites
kpinnc 12,028 #2 Posted January 19, 2022 Yes and yes. Just remember that you've got a 700 series Eaton, so the oil in the "pump" (transmission) is separate from the transaxle (gearbox). You'll need to drain and change both. Take special care not to introduce any dirt or grime into the pump. One grain of dirt and it's all over. Think surgical clean. 4 Share this post Link to post Share on other sites
Handy Don 12,226 #3 Posted January 19, 2022 (edited) 10 hours ago, kpinnc said: Take special care not to introduce any dirt or grime into the pump. One grain of dirt and it's all over. Think surgical clean. The manual doesn't call for changes in oil for the Eaton 700. And, frankly, trying to do it is H A R D. The drain plug is under the hydro and above the transaxle--you have to separate the pump from the transaxle to get at it. There is a port at the top of the hydro for the oil reservoir, but it is smack on top of several internal pump/motor components--sucking the oil out that way would be a major PITA and you risk getting a tube or straw stuck in there (when the hydro gets warm, the oil expands up into the reservoir). Bottom line? IMHO, unless you see a problem with the oil in the reservoir, it is not worth the trouble to change. Others on the forum have suggested repeatedly removing warm oil from the reservoir and replacing it with clean oil so that over time, it is "refreshed". Edited January 19, 2022 by Handy Don 2 Share this post Link to post Share on other sites
kpinnc 12,028 #4 Posted January 19, 2022 (edited) 5 hours ago, Handy Don said: The drain plug is under the hydro and above the transaxle--you have to separate the pump from the transaxle to get at it. Or at least remove the fender, fuel tank, and left side wheel to get to the drain plug with an open end wrench. I would NOT remove the reservoir (if it is the cylindrical one that screws into the pump) as it would be very possible to allow grit into the pump. Better to remove the pump altogether and use the drain plug. If you go that route, you can add a hose to the drain hole that with a plug on the end so as to be able to reach it next time. If the reservoir is the type that uses a hose connection to the pump, you can remove that type safely. May be more fun to turn the tractor upside down... I guess the periodic refresh is sensible, and over time the oil would be completely replaced. Mixing synthetic with conventional won't hurt anything. Eventually it will be 100 percent. Edited January 20, 2022 by kpinnc 1 Share this post Link to post Share on other sites
