Small Engine Troubleshooting Problems? Ask a Mechanic Now.
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Do you have the model numbers for your mower? I would like to take a look at a diagram of your mower.
Thanks for these numbers. Are you using an OEM belt?
Does your belt seem to be tight enough?
Please take a look at the image below. Check out the parts I have highlighted with red arrows.
Thanks! Check each of the highlighted pulleys to see if they are partially binding, or have a slight wobble.
Double check your belt routing. Also, check your idler pulley arm #6, for excessive up and down movement.
If all of your pulleys are true and spin freely, without wobbling, and your idler arm is pivoting freely, without excessive up and down play, then our problem could be the belt you are using.
This will be fine. Just grab each pulley and wiggle it, and spin each by hand. Your idler pulley will be simple to replace. If one of your transaxle pulleys are wobble, then you could have a worn bearing on the input shaft that goes into your transaxle.
If your idler arm is bent or partially binding, it is simple to replace also.
Your idler arm has to pivot smoothly and freely back or forth.
I am also hoping that our problem is simple to resolve. Just to be sure, I would return the belt you have to TSC, and pick up an OEM belt.
Process of elimination ...
Your Mustang have a fairly straightforward drive system.
I will work you until we get this resolved.
You are very welcome! If one of your fans are sitting too high, this indicates that your pulley is also too high, and could cause a belt to jump off.
There is a snap ring that holds your input shafts in place. Since your pulleys are bolted to your input shafts, the only way for them to rise up, would be if you are having an issue with your input shafts, or if your nuts are loose. Let's hope that after you inspect them, your pulleys are fine.