Junk XR gears.
04-09-2009 | 03:45 PM
#21
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Joined: Nov 2002
Posts: 4,176
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From: ankeny,ia.
Do you run the boat hard.??? How long have you had the XR's did they come with the 575's. Not sure of the torque number on 575's?
I hope I'm not floating in the river this summer remembering this thread and thnking they told me so.!!
I'm a little pissed that Merc. does not admit to quality problems like this.
I hope I'm not floating in the river this summer remembering this thread and thnking they told me so.!!
I'm a little pissed that Merc. does not admit to quality problems like this.
575's come standard with XR's....the boat's a 02'
I'd say it gets average use....I don't baby it......but
it's not at WOT all the time either....and I'm not too
bad on the sticks when the water gets rough.
I too have wondered if merc is having these
gears made in China.
It's sad, but I just put myself in a mindset that it's not
"if" they're going to break, but it's "when" they're going
to break.
My old boat with HP500's and regular bravo's never
had a drive problem in the 6 years I owned it.
04-10-2009 | 08:41 AM
#23
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Joined: Jul 2007
Posts: 406
Likes: 1
From: Memphis Tn
BDARCHER, I'm in the die business at GM. We use S7 as our material for trim dies. You are right it is a very tough steel, it's sometimes called chisel steel. Many times, I've thought that S7 would make a good steel for Bravo gears. We heat treat it as an air hardening steel in oven and flame hardening to about 62R. That's probably too much for gears, make them too brittle. Getting the heat treat correct would probably make or break the gears and require some experimentation, $$$.
Thanks Bob
04-14-2009 | 06:40 AM
#24
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Joined: Jul 2002
Posts: 2,867
Likes: 3
From: Waterford,MI
Right, broken gears always seem to take a lot of other pieces with them. I think I would start by furnace hardening the S7 to 56-58R. They will have a deep hardness most of the way thru the teeth. How will you attach the cone to the gear?
