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Re: (ET) Mower Musings



David,
   A mechanic friend of mine turned me on to "Fluid Film" rust 
preventative..... he uses it on cars and it is a "natural" product like 
WD-40.  It was developed during WWII to protect ship steel from rusting 
along with guns, etc.... it's a wax based substance and actually gets 
absorbed into the metal.  It's also non-conductive and can be used on 
electronics.  Almost too good to be true but it works. 

http://www.fluid-film.com/

  As far as changing bearings, be careful and you can do it.  Be careful 
pulling the rotor out.  I changed some on a small motor last night and cut 
the inner race off with a cutting wheel so I didn't wreck the commutator.  
No problem.

...Walt

-----Original Message-----
From: David Roden [mailto:etpost drmm net] 
Sent: Thursday, June 20, 2013 1:13 PM
To: elec-trak cosmos phy tufts edu
Subject: (ET) Mower Musings

One of the mower motors on my Avco R36 rider has gotten noisy, so it's 
time for a refurb.  I've pulled the deck and torn it down.  Two questions 
come to mind.

QUESTION 1: mower motors.  I've successfully changed lower bearings in 
mower motors before, but I remember that for some reason I failed with the 
upper bearings.  I don't recall why (it was at least 10 years ago).  I 
don't own a press.  Anyone have any upper-bearing-changing tips?

I'm also concerned about the potential for breaking a magnet.  These 
motors are a different size from any I've seen used in front-deck ETs, so 
they're probably more scarce.  How much risk is there?

Should I be cautious and instead take the motors to a shop?  I had the 
drive motor bearings changed by a local auto electric shop a while back 
and they seemed to do an OK job, thoiugh it was a tad pricey, and they 
used some bearing brand I'd never heard of.

Further comments?  Thoughts?

QUESTION 2: Last time I had this deck apart, I ground the rust off and hit 
it with an etchant, then painted with "appliance epoxy."  That was a bust. 
 
Rust remained in pits and the rust soon pushed right through the paint. 

Last time I did a (different) mower deck, I had it sandblasted.  I sprayed 
the top with rattle-can enamel, then used two-part primer and topcoat on 
the underside.  (You have to be careful and work outside with a box fan - 
the fumes are deadly!)  

That seemed to stand up better, but in truth I'm not sure.  I almost never 
use the front mower any more (I like the Avco rider better for mowing), so 
it hasn't had a real test.

Over the years I've read some other ideas on this list - POR-15, I think 
powder-coating (someone at work suggested that too), and even galvanizing. 
 

Has anyone tried powder-coating a well-worn mower deck?  How well did it 
stand up?

I know we have some POR-15 advocates here.  I've never used it, but just 
about fainted at the price.  Some say you can brush it right over rust, 
but I really want this deck sandblasted.  Would it be pointless to use 
POR-15 on clean metal?  Does it need a primer on clean metal? 

What about POR-15 over powder coating?  Something else?

And - is POR-15 really all that durable?  Will it last for, say, 5-10 
seasons of mowing?  

It's also nice if it's not too sticky and the grass is easy to scrape off 
(I use a plastic windshield scraper).

What's worked LONG TERM for you for protecting mower decks?

Thanks.


David Roden - Akron, Ohio, USA

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