Thanks soonersailor and
mechanic for your input.
The latest information is:
Original down island vendor was an empty bucket of help or support
Below is a Quote from Imtra's excellent support, their online resources
are impressive also.
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Lofrans fills their windlasses with a 90 weight gear oil that is a murky orange in color. I've seen gear oils with a variety of dye colors and they do change slightly in time. This type of gear oil does not easily break down. We see windlasses that are 10-20 years old come back to Imtra for
service and the owners have never changed the oil. Unless
water intrudes, the oil can last for years. What you describe does not surprise me.
Regarding oil levels, the minimum amount should fill the gearcase such that at least half the worm screw is in the oil bath. Half way up the sight glass is the minimum. A bit more is okay and all the factory filled windlasses tend to be filled such that the sight glass is completely covered. This is okay. Never add oil unless you know of a seal leak and at that point, you should be addressing seal replacement instead of just adding oil.
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Also after a query of other newly installed Lofrans windlass owners,
it appears that the color and consistency is normal.
Best regards,