A synthetic lube is probably the best, but an expensive alternative. Hub
City's gear reducers (as used on US Towers) recommends thier p/n
8-58-00-01-011 which I believe is Exxon-Mobile's SHC634 synthetic lube
(quart container). A google search will find the specs on the lube.
----- Original Message -----
Sent: Monday, August 07, 2006 10:00 AM
Subject: [TowerTalk] 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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