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Discussion Starter #1
Good Morning,

First time poster, I appreciate everyones insight. I went back several pages and searched but probably don't know the right terminology.

I am the second owner of the above machine. Overall a pretty good machine, I've kept the maint up on it as much as I know how.

I have done most of the maint since I've owned it. I use it to cut a small ( in relationship to most here) yard, but, I have a big hill which is the most important reason for the large tractor.

I have noticed that the traction belt doesnt run smooth, it bounces around crazy between the pulleys and sheaves. I replaced the belt and it still does it. I've also replaced the bushings on the idler arm and ordered a new spring. When the mower is running, I can pull the idler arm and get more tension on the idler and things smooth out a bit. So, we'll see.

How do you diagnose worn pulleys and sheaves? They all seem to spin fine without any grinding or noise, how do you determine if the opening is too worn out? I'm wondering if they are so worn out that the channel the belts ride in are going too far in and pinching inside the pulley.

I could begin replacing them all, but, i hate throwing money at it until it goes away.

Any thoughts you all might have would be greatly appreciated.

SteveG
 

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Hi,

I think it is normal for the belt to bounce around, especially on the slack side. You might want to check all the pulleys, especially the one at the back of the tractor, to make sure nothing is hung up in it. stuff like gum balls and pine cones and such have gotten into mne before. Check to see if any of the pulleys are bent.

If the pulleys don't have bushings you can tell if they are worn out if they sit kinda sideways when tension is applied, they will tilt downward on one side, the other will be tilted upwards, but I am sure you knmow that already.
 

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Discussion Starter #3
Thanks for the response, I've looked over these pulleys and sheaves closely. I've spun them some and there is no roughness in the bearings. I just replaced the idler bushings hoping that would help, no luck.

Can the pulley itself wear down and start pinching the belt? How do you know if a pulley is worn? Can I get these pulleys elsewhere? From JD they're 18 each, the motor and transaxle pulleys are 40 each.

I'm stumped.

I hate to just start throwing money at it, but, it seems thats what I may end up doing.

Thanks again for your help,
Steve
 

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It's normal for belts to look like they are vibrating. As for the grooves in the pulleys being worn, they won't pinch the belt. What happens is the sides of the belt wear causing the belt to sit deper in the groove which is ok until they get deep enough to touch the bottom of the groove. Once that happens, the belt will loose it's grip and slip. "V" belts work by gripping on the sides, not the bottom. As to tell if the pulleys are worn, you have spun them and felt no roughness, also check to see if you can grip them and make them wobble. That would indicate worn bearings. My guess is all is ok. The mower deck on my 316 was replaced about 20 years ago, and the bearings are still good. I replaced it because the first 6 years, I used it commercially, cutting about 12 acres or more a week. The deck shell itself was so beat up, it wasn't fixable.
 
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