Rearend vent

[Wayne Harmsen]

I noticed a couple drops of oil on the garage floor under my moter trike today after I got back from a ride.
When I looked under it I noticed oil on the left side of the axel housing.
My first thought was that a axel seal was leaking, but when I took the wheel off I could see that the oil was coming from the axel housing vent.
I checked the oil level in the rearend and it was right to the bottom of the fill hole. Is it possable that it might have been a little over filled at the factory.
We have about four hundred miles on it.
THANK'S:yes:

 

[ben721364]

I noticed a couple drops of oil on the garage floor under my moter trike today after I got back from a ride.
When I looked under it I noticed oil on the left side of the axel housing.
My first thought was that a axel seal was leaking, but when I took the wheel off I could see that the oil was coming from the axel housing vent.
I checked the oil level in the rearend and it was right to the bottom of the fill hole. Is it possable that it might have been a little over filled at the factory.
We have about four hundred miles on it.
THANK'S:yes:

Over-filling sounds like the culprit to me.

 

[cjmitch]

That happened to mine after about 500 miles...
then after about another 50 miles or so it stopped, and hasn't happened since...

 

[carbco]

Took My trike into dealer to have the rearend and gearbox oil changed and they overfilled both. It's an '11 CSC Cobra XL I had oil under the trike in the garage and it was puking it out the vent on the top of the differential. Drained the oil out and made a gage out of a piece of coathanger. Bent the end down about 3/8" and put a mark on the end at 1/8" down from the bottom of the fill hole. That's the depth that CSC recommends from the bottom of the fill hole. Filled them both to that depth and no more rearend leaks. CSC does not recommend using any kind of synthetic gear oil in their rearend assemblies. Must have to do with the seals as I can't see what other problem synthetic grease would cause? Synthetic fluids withstand higher tempratures and in my opinion lubricate much better. Maybe I'm wrong?