[Hallicrafters] Hurricane noisy fan

[Jim Liles]

Hi again Richy:

The previous solution turned out to be temporary.  Had the radio on for 
about 20 hours and it returned just as bad as ever.

I do have a fix though.  Found a fellow that said he had new motors for the 
SR-2000 blower.  Bought one for $95.00 + shipping.  Installed it and it darn 
near blew the 8122's out of their sockets.  would have blown the radio 
around the room like a get away balloon but I grabbed the power cord to 
prevent it getting away and tearing up the house.

Long story short.  Just because a motor is the same size, looks exactly the 
same, smells the same, doesn't mean they are the same.  There can be vast 
differences in these blower motors and by the way the difference can do 
damage to the radio from lack of air flow, circuit damage, or be just plain 
noisy.

Went to the storage locker and found several blower motors that I had 
squirrelled away and forgotten.  They looked the same, and appeared the same 
size.  Brought them home and did comparison testing and voila, they work 
great at low and high speed, ----  and ------------------ are quiet!!!  When 
I finish testing, I'll post a note and hopefully find the vendor and part 
number.  There is no part number or otherwise identifying data on the 
Hallicrafters motor or the ones that I found.  Does anyone know for sure who 
made the motors for the Hallicrafters gang --- no guesses.  If you do please 
share the source.

Kindest regards Jim K9AXN

-----Original Message----- 
From: Jim Liles
Sent: Sunday, December 08, 2013 10:30 AM
To: hallicrafters at mailman.qth.net ; ss409ss at aol.com
Subject: Re: [Hallicrafters] Hurricane noisy fan

Good morning Richy:

Just finished making a noisy, rattling, retched sounding blower for an
SR-2000 become quiet and smooth.  Here are a few pointers.

First, that blower was used in several amplifiers of that era.  It has more
than adequate capacity and will last for 679 years.  It also was not
terribly expensive.

The most problematic malady is imbalance in the squirrel cage fan.  It
accumulates debris and goes out of balance causing vibration.  This
vibration combined with lateral armature play allows the whole rotating mass
to rattle not only up and down but laterally.

Here is how to fix it.  Take it entirely apart --- don't be lazy and go part
way, you'll not do it any good.  Watch for the shims that are on the
armature shaft, you'll need them.  Note the end play in the armature.  You
will find it universally excessive --- should not exceed 15/1000 inch or so.
To correct excessive play, go to ACE hardware or Menards and search the
screw and nut cabinets for nylon and composite washers.  Buy and assortment
similar to those that you removed from the armature.  You will notice that
most are a bit wider in diameter than those in the motor.  Not to worry, you
can trim them down with a scissor.  Select a combination that will result in
the appropriate end play.  Be careful to use one of the composite/metal
shims against the end bearings.

The end bearings are gimbaled, that’s to say they will find the appropriate
alignment when assembled sort of like a ball joint.  They are not delicate
but many are damaged when trying to remove a jammed blower blade.  Use WD40,
patience, a little heat, and if all else fails more patience.  The end
bearings are peened in place and if enough pressure is exerted on them
trying to remove the blower blade, they can move from home resulting in end
play changes.  Think that does end play.

Blower blade balancing.  This fan has no filter and I'm not suggesting that
you use one.  They collect everything known to man.  Soak them in whatever
you like but get them clean --- no short cuts.  Re assemble and apply power
with the blower simply sitting on a hard surface.  If there is an imbalance,
it will be quite apparent.  Simply add a small weight and check for the
location on the blade where vibration is minimal.  Now vary the weight until
there is no vibration.  Use that much solder at the same location.

Now you have a smooth sounding blower.  One last thing --- thought you were
through ehhh?

That fan must be capable of starting when applying 110 volts through a 250
ohm resistor.  If it won't you have two options.  Fix it or find a resistor
that will fit in the same location as the 250 ohm resistor that you will
find in the final compartment that will enable the motor to start at 110
volts.  This test is one of a litany of regression tests that must be done
during a proper restoration of an SR-2000.

Sounds like an awful lot of work for a silly blower but when you are tuning
around the band looking for a weak signal, having to listen to a turbo prop
spinning up will send you to another radio.

Hope this helps.

NOTE:  USE SYNTHETIC CLOCK OIL IN THE WICKS --- WON'T CLOG OR HARDEN!!!

Good luck and Kindest regards Jim K9AXN

-----Original Message----- 
From: ss409ss at aol.com
Sent: Sunday, December 08, 2013 5:43 AM
To: hallicrafters at mailman.qth.net
Subject: [Hallicrafters] Hurricane noisy fan




  Anyone ever solve a noisy fan complaint on a Hurricane? It's a little
beyond oiling.. :-) Any possible replacements or source for an original?
Thanks Richy N2ZD







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