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Vacuum test on alpha 1 gen 2

Personally, I rely more on vacuum testing of lower units than pressure. If the seals leaks oil OUT the drive will keep functioning--it will run fine when half empty (or more)--but if the seals allow water to get in it's curtains! A vacuum test will tell you if water can be sucked in.

Jeff
 
Actually jeff you have it backwards.....
Water will lubricate temporarily where as if you go half empty on gear oil you will fry the bearing in the cap on the top of the upper case.

Pressure testing will confirm no oil will leak out...it does not always confirm water could get in.
If water is present in gear oil and the drive (empty) passes the pressure test then a vacuum test should be done. 4-8 inches is typical to expose a leak.
 
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