Hi Mike,
In the past I have had good luck using wheel bearing grease. It is cheep
and looks a bit like "Lubraplate". It is made to take high temps as well as low
temps and generally will not gum up.
Best 73
Mike Baker KØQZ
"Gilmer, Mike" wrote:
> I'm trying to "restore" a pair of ARD230A amps. RF decks and PS seem OK.
> They both make power. The few identified problems seem to be in the control
> crap. Go figure.
>
> Amongst these problems, I found that one unit's motor drives (on TUNE and
> LOAD caps) work OK, but the other's wouldn't turn when driven. I had a spare
> reduction drive so I tried it, too: NG.
> Turns out (after biting the bullet and drilling out the swages on one to
> open it up) that the grease used to lube the gears inside the reduction unit
> had turned tar-like. The innards have 6 or 7 gears - some plastic (motor
> end) and some metal (at the output end). The grease around the metal gears
> was what became tar-like. The grease elsewhere was still "normal". After
> cleaning out the "bad" grease, the unit worked fine. I can even put the
> drive unit back together :)
>
> Questions:
> 1. What would cause the grease to "gum up" like this?
> 2. What should I replace the grease with? (short of converting them to
> manual tune, hi)
>
> Mike
> n2mg@contesting.com
>
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