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Re: [Amps] Centrifugal Blowers

To: Byron Tatum <>
Subject: Re: [Amps] Centrifugal Blowers
From: Jim Kinney <>
Date: Wed, 26 Jan 2022 19:37:19 -0500
List-post: <>
If you can get the motor apart, you might be able to find bearings for it, it's 
worth a try.  Measure the bearing and google the dimensions, inch or mm for the 
best match.
With my W6PO amp, I moved the blower away from the amp using dryer duct.  Lots 
Good luck.
73, Jim WE4S

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On Jan 26, 2022, 7:12 PM, at 7:12 PM, Byron Tatum <> wrote:
>Hello-   Anyone in our group have knowledge of replacing the motor on a
>centrifugal cooling blower? I have been rebuilding a few RF decks made
>in the 1970's by Scientific Radio for the SR-416A transmitter. These RF
>decks are a copy of the Eimac W6PO 144 Mhz design using 8877 tube. They
>use a Kooltronics blower with 5" wheel and square outlet with mounting
>hole centers 2-5/8" apart in a square pattern. I have bearing noise and
>vibration in a few of my motors. The motors are sealed bearing
>Kooltronic #7162-082 type U62, 115 VAC @ 1.55 amp, using 4 ufd
>capacitor. 2850 RPM at 50 Hz, 3400 RPM at 60 Hz.    After looking at
>prices of replacement blowers/motors I was shocked. Can I replace the
>bearings in these motors? Or just buy new motors somewhere? I really do
>not need the performance of these blowers, the transmitters were
>running at 1 KW 24/7 and I am just doing SSB/CW. Sure could stand to
>reduce the blower noise some.   Thanks,Byron W5FH 
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