Small Engine Troubleshooting Problems? Ask a Mechanic Now.
Does the deck spindles and pulleys all turn free when belt is off?
Hi, my name is***** will be assisting you.
At what rpm are you engaging the PTO? Are you at full throttle, half throttle? Does it seem to make a difference?
And it still throws the belt and spring at half throttle?
It sounds like the blades or an idler pulley are not spinning freely which is causing you to throw the belt, the spring coming off is a result of the belt coming off first. When you engage the PTO if the blades or pulleys aren't spinning freely it will cause such a load on the belt that it will overextend the spring and flip the belt off, when the belt comes of it does so in a way that the spring then will come off. I am going to recommend going back and checking the idler pulleys and deck spindles to make sure that they are all turning freely. Are you running heavy duty wide blades on the machine? Are you mulching with the machine?
That's where I would start at. I have seen this same thing happen if you are engaging the PTO at full throttle but according to your information that should not be the case. You indicated that you installed a new belt is it an original equipment belt or an aftermarket belt?
It was just a thought, sometimes aftermarket belts are not an exact match to the original and can cause problems.
I would take a close look at the pulleys and spindles to be sure that they all turn freely.
Thank you it has been a pleasure to assist you.
Please take a moment to rate your experience.
If it is an idler pulley then you would have to replace the pulley it will come with bearing made into it. If it is one of the deck spindles then you can either tear the spindle apart and replace just the bearings or you can replace the complete spindle as an assembly.
It has been a pleasure to assist you.