[Towertalk] RE: Bearing for Prop Pitch Motor

[Kurt Andress]

Alton McConnell Wrote:

<
I need to locate a bearing for a prop pitch motor.  The bearing is a MRC G 
203 R1.  MRC has ignored my e-mails.  Detroit ball bearing does not have 
one.

This bearing goes on the low speed hub in the large planitary gear system.  
There are six bearings on the hub.  I have one that is bad.

The bearing is 17 mm id, 10 mm thick (high) and 1.5 inches OD.  I am told 
the dimensions are starnge to keep people from using industrial bearings in 
aerospace applications.

Does anyone have a source for this bearing or does anyone have a spare 
bearing from a junk PP motor?
<

Mike Wetzel wrote:

<
I tried unsuccessfully to find this bearing several years ago.  Even had my
bad bearing send off to the factory with no luck, they said it was made in
something like 1943. 
<

The same situation exists for MRC 0017 thrust bearings. There was a bearing
house in L.A. (think it was United Bearing) that had a bunch of them years ago,
but the company is gone. If anyone knows who ended up with those surplus
bearings, I like to know. They are usually the first to die from corrosion.

Have a local machinist make a plain bronze bushing to replace it. Mount it in
the housing with Loctite bearing mount compound.

You might be able to adapt another bearing, but it is likely more work than a
plain bushing. 

Good Luck! There should be lots of junk prop pitch gear boxes out there by now,
hopefully they didn't all get thrown away.

-- 
73, Kurt, K7NV 

http://yagistress.freeyellow.com