Hello,
I had a variable speed drive belt break on my mtd lawnmower (tmo-3200003). I purchased a Gates v belt (5/8 x 53") to replace it with.
My problem is that I am not exactly sure how the belt goes back on. I have tried a couple of different ways and it will not drive my trans axial pulley. It is either too loose or too tight.
I have the belt going from the engine shaft pulley back to the variable drive pulley, but in between is some sort of other pulley. I am not sure how it goes around that. Does the belt go on one side of it (too tight) or on both sides of it (too loose).
Another thing to consider is that during the process of changing the belt, the extension spring, connected the Variable Speed Torque Brkt. ***'y came off as well as the Variable Speed Torque Brkt. ***'y itself. I think I have it all put back together properly, but I am not positive.
Thanks for any help.
Get your model and serial numbers from under the seat. Then go to the MTD website where you can download the owners manual which should show the belt diagram.
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The bronco is a variable speed mower from what I remember. There is a belt that goes from the crankshaft to a variable speed pulley and another belt from the variable to the transmission. If your 1st belt is too long it will never get up to speed. Do you have to push the pedal down further now than before to get it to move. ? If so your main belt is too long.
The drive belt is tensioned by a spring on the clutch pedal. If you can give me the model of mower you are working on, I can help you find the spring or the variable speed pully.
The front belt should be a 954-0280A, rear 954-0370. When you go to higher gears, the front belt should be getting tighter as the vari-speed pulley is moving further back. Remove the shift plate, put the transmission in neutral. Start the engine, put speed selector in highest gear and slowly let out on the clutch. You should be able to see what the problem is. It will do everything the same as if were in gear, except move. Make sure you have the correct belts.
Take off the plate around the shift lever between your legs and take a look at the belts. Most likely they will be in poor condition. You can even leave the trans in neutral, start the engine and move the speed selector through the gears and observe the belts in action. They do the same in neutral as in gear when you let out the clutch with the engine running. You should be able to see what the problem is, It will either be one or both of the belts or possibly the needle bearings in the vari-speed pulley itself,
If you are putting on the mtd belts and installing them right then you need to check bearings in variable speed pulley Also check idler and that no other pulley has been bent from installation.
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