On 06/16/12 11:17 PM, wb6rse1@mac.com wrote:
> I recently replaced the blower in an Alpha 87A. The procedure is well
> documented by Brian, N9ADG:
>
> http://lists.contesting.com/archives//html/Amps/2011-12/msg00217.html
>
> Instead of disassembling the old blower, I applied two drops of "3 in 1" oil
> to both the front and rear ends of the shaft. On 240 volts, the blower
> quickly came back to normal from the loud squeaky sound it had been making.
> After several hours, the old blower continues to run quite well without noise.
>
> The replacement of the blower, while straightforward, is not trivial and is
> very time consuming. If I had it to do over again, with the front of the 87A
> tilted up, I would have looked for a way to get a long oil dropper onto the
> front of the blower shaft instead of removing the blower. The rear end of the
> shaft is easily accessible through a hole in the rear of the chassis but the
> noise seemed to be predominately from the front. The orange connector at the
> rear of the AC unit holds the blower's AC leads. I'd disconnect it and splice
> in 240v at let in run leaving the rest of the amp un-plugged and un-powered.
>
> It would have been at least worth a try. Worst case is to have to replace
> blower anyway.
>
> 73 - Steve WB6RSE
If it was a lack of lubricant which caused the problem, I would suspect it has
done some damage. It might be worth replacing anyway, despite the oil appears
to
have cured the problem.
Dave
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