Thanks for the replies - looks like SAE 90 lube oil is the right thing to use.
> From: <firstname.lastname@example.org>
> Date: 2006/08/07 Mon AM 11:00:20 EDT
> To: <email@example.com>
> Subject: Crankup tower gearbox lube question
> I have an old Tri-Ex HZE-354 motorized crankup tower with a 40:1 ratio
> gearbox turned by a 1 HP motor. When I bought the tower, the gearbox was
> empty - no oil or grease of any kind inside - I guess from the staining on
> the gearbox, it had leaked out over the years. I have filled the gearbox with
> a mixture of SAE 90 gearlube oil and black lithium grease. It turns quietly
> and smoothly and leaks very little. There is a pressure relief fitting on the
> top of the gearbox.
> My question is this: what do others recommend in this situation, and what do
> the manufacturers of towers fill the gearboxes with - lube oil like SAE 90,
> lighter weight oil like SAE 30, gear grease? The gearbox does get warm when
> lifting the tower and I'm a bit concerned that the lubrication could be
> improved. The tower goes up and down quite often, four or five times a week
> depending on how many thunderstorms we have.
> Thanks guys for your comments - always appreciated.
> 73, Charles, K4ZRJ, Woodstock, GA
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