[TMC] PAL-350 blower

[jvendely at cfl.rr.com]

Yes, these are easy to replace with a small cheep bearing puller of
the type commonly available at auto parts stores. The bearings are
inexpensive, standard sealed types available from manufacturer New
Departure and several others. I've had to replace them in PAL350/500s,
PAL-1Ks, DDR-5s, and GPT-750s. I can't recall the part number, and am
traveling at the moment. 

One oddity--I've seen a couple of IMI motors where some kind of odd
winding (?) fault caused the rotor to rattle around, making sounds
similar to bad bearings, but somewhat more "rumbly". Installing new
bearings in these motors had no effect, the noise remained as before,
and I ended up replacing the motors. One was in a DDR-5, the other a
GPT-750. I didn't spend much time investigating, so never determined
the cause; perhaps someone more knowledgeable can shed some light on
it. Whatever it was, it wasn't mechanical--the rotor rotated very
smoothly by hand, but ran very roughly when powered...
73,
John K9WT

	-----------------------------------------From: "John Poulton" 
To: "Robert Nickels"
Cc: "tmc collector's group"
Sent: Thursday July 11 2019 4:52:31PM
Subject: Re: [TMC] PAL-350 blower

Bob and the group,

 It's pretty easy to replace the bearings on the PAL-350/500 blower. I
 described the process in considerable detail at:

  > Help:  Please help support this email list:  Help: 

Links:
------
[1]
http://tmchistory.org/tmc_restoration/PAL-500/pal-500_restoration_notes.htm
http://tmchistory.org/tmc_restoration/PAL-500/pal-500_restoration_notes.htm
 /> 
 scroll 'way down, and you'll find it under the RFE-1 section.
Bearings are
 common.. I got mine from MSC, but you can probably find them on ebay
as
 well.
 
 The blower is TMC part number BL-100. There exists a drawing for it,
most
 likely, but I haven't yet scanned it. If you think it would help,
I'll go
 hunt it up (assuming it hasn't been lost over time), and add it to
the
 drawings repository.
 
 The blower was made by IMC Magnetics, and appears to be a custom-made
item
 for TMC. You can *almost* read the IMC part number on one of the
 photographs on my restoration page. You might be able to find an
exact
 replacement out there somewhere.. just need the voltage/current,
overall
 size and shape, mounting holes and shaft dimensions, then.. go look.
It's
 surprising what you can find if you're determined enough! For
example, the
 blower motor in the GPT-750 is a standard motor and easily obtained
from
 several sources.
 
 73, John K4OZY
 
 
 
 On Thu, Jul 11, 2019 at 4:37 PM Robert Nickels <ranickel at comcast.net>
wrote:
 
 > Sounds pretty noisy to me, it coasts for a long time, but it makes
a
 > rumbling sound that's louder than I think it should be that might
 > indicate bearing problems. No oiling or other maintenance info in
the
 > manual - just looking for best practice is for this type of blower
 > (which I suspect is used in other TMC gear). Mfgr name and p/n
 > aren't visible without removing it.
 >
 > Thanks and 73,
 >
 > Bob W9RAN
 >
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