[HuFlungDung]

Is it normal to have a bit of oil weeping out of the front seal of something like the HRT310 rotary? I use it a lot running unclamped while doing spiral milling, and run it for an entire day. It leaks enough that would saturate 4 ordinary paper towels, a few tablespoons, I suppose.

I'm supposing that this might be normal, due to running unclamped (maybe creates a bit of clearance, or something) but I don't know if a brand new one would behave this way. I bought mine used, in apparently excellent condition, but with an unknown amount of hours on it. I wonder if there is a worn seal or one that has 'gone hard' and should be replaced.

It does not leak when sitting unused.

[Geof]

Does it get warm while it is running? This could act to push oil out through the seal. Something the diameter of the seal on a 310 can be expected I think to show a bit of weeping; calculate how much it is losing per inch of seal length per rotation and I bet it is a very tiny number. I know if I was encountering a few paper towels full per day I would make sure I had a supply of oil to top it up and not do anything else. If it was leaking anything overnight while not running then I would look into it.

[HuFlungDung]

Thanks for the reply, Geof.

The unit is stone cold, as it is turning very slowly.

I did get a pail of oil, so I suppose it seems suitable to keep sopping up what seeps.

[Edster]

I have a HRT160B new in 06. Never leaked a drop running or sitting. Are you using the Haas oil?

[binzer]

I just changed the oil on a 210 its been running for 2 years and never leaked a drop oF oil. But The other day air was leaking out the back. So order the 2 diffrent o rings pulled the cover and there was a lot of rust. The bigger O ring was the one where it was leaking but the o ring looked fine I replaced it anyway and everything is fine now.