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Discussion Starter · #1 ·
I have a new JD 757 60inch with around 33 hours. It has been cutting great all summer. Around 20 hours I began hearing this weird rattle-like sound in high grass or when the deck is under a good load. It sounds like what the blade spindles would sound like if they could rattle and had no grease... I had started to believe it was the deck wheels...

After much thought and inspection I had begun to ignore it thinking I'm being to picky...until today. I was mowing along great and the mule drive belt that drives the deck flew off the engine pulley and wedged between the engine and the pulley almost cutting it in half. I fiddled with it for a while and got it back on correctly and could still cut. I spoke with a dealer (not the one I purchased it from because they close at noon on Sat...of course) and he said he has seen problems with the mule drive pulleys being semi-loose from the factory and destroying themselves around 20-30 hours. Said the ones he has seen would "eat" or throw the mule drive belt...JD had to replace the belts and the drive pulleys before they would stop...

Has anybody seen or heard anything close to this? Any input will be greatly appreciated.

Thanks,

James Day
Magnolia Landscape Management, Inc.
Jackson, MS
 

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I have a 737 and it did that to me at 35 hrs. took it back and it runs great now. good luck
 

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i had the deere m665 60" 7 iron deck (the kees unit) it had 700 hrs on it when i sold it and i never put the first belt on the machine, i bought it new. it alway cut great and gave me no poblems, people can say what they want about deere, but i have had good experiences with them. i really had no good reason to sell it, but i had to have that super z!
 

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I have 757 25hp,60" deck have never had any problems with the belts in 300 hrs. Still original belts.
 

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Check the tension of the belt itself. You have passed the "break in" period and something might have adjusted itself out of position. Check the idler adjustment to make sure the belt is not too tight. I was told that on a 737 or 757, as the belt stretched itself, the idler assembly would rotate out of position increasing tension on the belt ultimately causing failure.
 

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Check under the seat, that machine should have a service interval chart on the bottom side of the seat pan. The dealer pointed it out on my 757 and told me to adjust the belt tension after the first day of mowing. Apparently as the idler moves, it causes pressure on the bearing and the bearing fails, causing the belt to fail. Not on all machines, just some.
 

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Discussion Starter · #11 ·
I've been mowing more this week and after simply placing the belt back on everything has been great. I do have one more question: when I turn the idler pulley (on the left looking at the back of the mower) it sounds pretty rough...the one on the right seems fine...think the pulley has some issues and that could be my new found noise/problem?

Thanks for all the replies. I really have enjoyed the crap out of this mower. Knowing my luck...the operator on Saturday hit a stick or something and caused it to pull the belt off...she...notice she...likes to run faster than she should in tall grass.
 
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