Sounds like you are gaining on it! Ya, that oil is contaminated with something for sure. Some oils do pick up water and get nasty even in a good vented system. Air moving in and out of the breathers will at some point in time make the oil bad.
The only model I can find is a TEL 29 N unit and nothing for the B unit. They might be close to the same.
Speaking of an old unit,----my Hi-Ranger is on an 84 F-700 truck and I would assume the bucket unit could be the same year so parts/info/manuals for these units are hard to find. I did get a manual for mine from an e-bay seller, so lucked out on that one.
