Spring keeps breaking - z125s 54”

Rivets

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Have a few questions to ask. 1. Has your dealer installed the update kit on your deck? There is one available under warranty. 2. Can you remove the belt covers and post a few pics of the deck? I would like to see if you have the proper spring dampeners installed. Close ups would be the best. 3. Does the tensioner arm move freely? Please post the model and serial numbers off the black ID tag. In my opinion your dealer is giving you a line when talking about pine cones. Most often the belt will break before the springs. If we find you need the update kit, I would find another dealer, as you have a good unit but a lazy dealer.
 

lugbolt

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the spring in the picture is the updated spring.

The #1 cause of spring failure is excessive vibration. That can be caused by a lot of things; most commonly a small piece of debris in the engine pulley, which causes the belt to jump, which makes the spring vibrate. Running at idle speed will also break the spring, as will a burned belt and a host of other things.

There was a campaign (like a recall) that did 4 or 5 repairs, but that campaign expired. It was 2 years long and letters were sent. Only certain serial numbers were affected. At this point the recommendation to the technicians doing the warranty repair is to visibly inspect each of the 5 pulleys for debris, then measure the belt width in many locations along the length of the belt. If those check out, they're going to want to look into pulley alignment too. This is assuming you're running full throttle wide open all the time, and the reason I mention it is because at idle speed the pulley and spring jump around quite a bit more than they do at 3500 engine RPM.
 

Rivets

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The only updated spring comes in a kit and the entire kit, pulleys, tensioner arm, belt and spring should be installed. They need to even drill new holes in the deck for the new tensioner arm. If I was you. I would take the model and serial numbers for your unit to another dealer and ask them to check Kubota records to see if this was done. There is no time limit on this update, as the dealers were to contact you when they got the kits in. Took us 18 months to get through our sold units. Second, I don’t know who told you that running at idle speed would cause a spring to break, but I say he’s full of it.
 

lugbolt

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The only updated spring comes in a kit and the entire kit, pulleys, tensioner arm, belt and spring should be installed. They need to even drill new holes in the deck for the new tensioner arm. If I was you. I would take the model and serial numbers for your unit to another dealer and ask them to check Kubota records to see if this was done. There is no time limit on this update, as the dealers were to contact you when they got the kits in. Took us 18 months to get through our sold units. Second, I don’t know who told you that running at idle speed would cause a spring to break, but I say he’s full of it.

That update consisted of several updates in one. One was a belt guard kit (48 and 54), one was the updated hst belt spring, then the tension arm kit (48" deck only), a brake switch kit, then finally the fuel pickup tube/shutoff valve assembly. There were serial number breaks; meaning that not every one of them was eligible and some were done at the factory. That set of bulletins (campaign) is now expired; it was active for, gosh, 2 years? I think it came out in early 2018, expired this year. Everyone who purchased a ZG or Z100 series got a letter, if it was purchased used, you probably didn't get a letter, however anytime one was at the dealer it was supposed to be checked to see if it was done or not; if not it was best to go ahead & do it if applicable. As said the spring in the pic is the updated spring. The issue with the OP is debris entry into the engine pulley which the campaign would not have addressed.

Hole does not need to be drilled for the tension arm kit. Holes need to be drilled for the belt guard kit (which is completely separate from the tension arm kit). There is a set of bolt-on pins that are to be installed and there are no holes for the bolts to hold the pins on, 2 holes per, and then a larger hole for the right side 8mm bolt and spacer.

Yes running at or near idle speed can cause the spring to vibrate more than usual, particularly the deck tension spring-which if you pull the covers and look at the belt and tension spring while idling with the deck engaged, you'll see what I mean. The spring disappears because it vibrates so badly.

The Z231 and Z251 have been updated in a few ways and parts of the update may retrofit-I haven't tried yet.
 
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