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Old 07-05-2007, 08:16 PM
MTFORK MTFORK is offline
LawnSite Member
Join Date: Dec 2006
Location: Oklahoma
Posts: 6
I've Jumped when new also....


Sounds similar to my only 'problems' on my 06' 42 incher. At about the 20 Hr mark it jumped off. Over the next 5 hr or so it came off couple more times again...ate belt/streched belt by that point..bought new one from dealer, replced..mowed a few hours jumped a few more times over a 10 hour period...destroyed belt again. Was at point of taking entire machine 3hrs to Dealer but I had bought 2 belts last time at Dealer. Put I put the 3rd one on and its been running 'Jump Free' for last 50 hr's or so....knock on wood. So maybe the pulleys, spring, Idler has to 'break-in'..who knows...

But I'm Happy now...

By the to your 'Tension' setting on your chain/Idler when you replace Belt, It plays big part in Blade RPM, overall cutting quality.

Take Care


06 Fast Track 42" 17 Kohler
Ariens LT12 (Heavily Modified)
02 Ranch King 42" 18hp B/S (junk but functional)
Stihl 044
Stihl 029AV
Stihl MS250
Stihl FS180
98' Ford 1920 4X4 Tractor w/bucket, Box with Bush Hog 820 Backhoe
2 Craftsman Backpack blowers
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