RE: (ET) Blown motors

["Elie, Larry \(L.D.\)" <lelie ford com>]

BTW, after repairing about 10 motors so far, the most likely failures are.

1.)  Bad springs on the brushes.  You didn't have this problem, but it's 
very common.
2.)  Loose or bad thermal interlock on top or side of motor.  Shuts down 
prematurely.  Replace or connect interlock better.
3.)  Bent armature shaft.  Motor works, but vibrates and eventually 
overheats.  I have repaired these with a dial gauge, collet and 'junk' 
lathe.
4.)  Bearings.  Hard to pull, but a press and bearing splitter along with 
heat does the trick.
5.)  Cracked or broken magnet.  When pieces come off, you get the symptoms 
you mention.  Some people have re-glued them successfully, I have not.  A 
new or used shell is called for.
 
I have yet to see bad windings.

Larry Elie


-----Original Message-----
From: elec-trak-bounces cosmos phy tufts edu
[mailto:elec-trak-bounces cosmos phy tufts edu]On Behalf Of Travis
Creswell
Sent: Saturday, April 17, 2004 4:45 PM
To: 'Chris Zach'; 'Elec-trak list'
Subject: RE: (ET) Blown motors


Bill typically gets the motors back within a week of getting them so you
won't be out of a mower for too long.  

Travis

-----Original Message-----
From: elec-trak-bounces cosmos phy tufts edu
[mailto:elec-trak-bounces cosmos phy tufts edu] On Behalf Of Chris Zach
Sent: Saturday, April 17, 2004 3:36 PM
To: Elec-trak list
Subject: (ET) Blown motors

Well, whatever it is, the outboard motors on my deck are 100% toast. 
They spin too slowly, and draw way too much current.

They're going to have to go to Bill Gunn land for some TLC, but in the 
meantime does anyone have a spare pair of motors that I can 
beg/borrow/buy? Otherwise mowing the lawn with a single deck motor is 
going to be *very* slow going this summer.

Thanks
Chris


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