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Old 06-10-2010, 02:09 PM   #1
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Main belt

My main belt is now 5 years old. Looks ok to me. Do belts age out like tires? If so, when should I begin to be concerned. (more than I am now )


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Old 06-10-2010, 03:34 PM   #2
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IIWMI'd carry a spare. In fact I do. And that way the original will never break. Takes a 1/2" breaker bar in the square-hole socket of the tensioner pulley to loose the Cummins belt. To reinstall, start at the bottom & wrap the new belt around the crank pulley, then follow the pulley type(s) around to the top

Baja-tested '08 2-slide 36'
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Old 06-10-2010, 05:17 PM   #3
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Cummins changed mine when it was 9 years old. You could see cracking across the surface of the belt. Its not as critical as a timing belt but carrying a spare wouldn't hurt.
John and Mary Knight
2015 Newmar Ventana 4311 - wheelchair accessible
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Old 06-10-2010, 05:29 PM   #4
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Mine snapped after 14k miles and it took me two days to find a replacement and get back on the road.

Like the others said, carry a spare!
Tom and Katharine
'07 Winnebago Tour 40TD, 400hp Cummins
'17 Winnebago View 24V, '02 R-Vision B+
RVing for 19 years & 150,000+ miles
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Old 06-10-2010, 05:32 PM   #5
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I changed mine at 5 years just to be on the safe side. Easy to change and cheap insurance for my cluttered mind. Kept the old one for a spare.
Jerry and Judy
Fremont, California
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toad 2012 Jeep Wrangler Sahara
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Old 06-10-2010, 05:44 PM   #6
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"Change It" I just ruined the beginning of a nice 10 day vacation when mine broke with only 14000 miles on it. I think the rubber ages on the belts just like the tires. It's easier to change in the driveway then out alongside the road when it's 100 degrees outside.

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Old 06-10-2010, 07:16 PM   #7
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I have had belts last many thousands (many ten's of thousand) Miles and I"ve had 'em go bad dang near overnight. If you are worried.. Replace it

If you are doing any thing that requires removal of the belt (IE: alternator, Water pump, Power stering pump) REPLACE IT Even if the belt is only six months old I'd not put it back on, New belts are not that expensive when compared to the labor to remove one.
Home is where I park it!
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Old 06-10-2010, 07:45 PM   #8
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Here in Alaska one wears in a new belt then uses it for a spare for the winter time. When a new belt is replaced during the cold it will not last very long, thus every rig we have has a used belt for an extra including the 2003 Alpine. Just a habit I guess. Iron Mike.
PS: If any Alpines come to Fairbanks this summer, we would be glad to see you. That is Fairbanks: 907 488 4554.

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