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720 A leaking hydraulic fluid into transmission?

3D1

Member
Joined
Apr 8, 2024
Messages
11
Location
Idaho
We got our new blade to shift and now it seems to be leaking oil into the Trans. It is very over full . And is now dumping out the vent behind the cab .

I was under the impression the Trans had it's own system. My main hydraulic tank is low and Trans has way to much.

Any ideas?
 

cuttin edge

Senior Member
Joined
Nov 9, 2014
Messages
2,775
Location
NB Canada
Occupation
Finish grader operator
Is it actually over full? Our 730 used to do that, but it was building pressure for some reason. They made a small tank, and mounted it on the back of the cab. The oil would spray into the tank, but then drain back into the transmission when there was no pressure. No idea what caused the problem, but you could hear the pressure escape out the vent in the top of the tank. Ran it that way for years
 

3D1

Member
Joined
Apr 8, 2024
Messages
11
Location
Idaho
Yes , I pulled the fill plug and got covered in oil. I am thinking there must be a seal in the hydraulic clutch booster that is getting back to the Trans?

Not sure at this point . It went on the trailer and made it back to the yard. I put over 20 hours on it in the last few days. I am going to finish all of the 3/4 road base with the guided blade on the bobcat.
 

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