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Hello guys I currently got my Massey 12 hydro out and I always hold it the brake to help start it. So it started up and left the brake out and the transmission made an awful noise. It made the tractor so much louder. So I pushed the brake in and it ran fine and the noise went away but when I left the brake out again the noise came back. Any help would be appreciated. Thanks collin
 

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I like to warm the hydro's and transaxel up before I start them Use a portable forced air heater and it don't take long at all. Start easier, run better and quicker and much easier on them.
 

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Just out of curiosity, was it real cold when you started it? Possible frozen moisture in there?
 

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Then I think as others have said, check the idler pulleys, fan, anything that touches the belt.

Most likely you'll find something wrong there.
 

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The Massey 12 hydro is a belt driven tractor. It uses a long drive belt from the engine to the hydro that has 3 idler pulleys it travels around. Two of them are the same and the third is a larger belt tightener. If memory serves correctly, when you depress the brake pedal, it also raises the belt tightener pulley which disengages the transmission. It sounds to me like the bearing on one of these idlers has gone bad hence whining noise.

To check all of these idlers, remove the front belt guard around the engine pulley, remove the right tire guard from the fender and step plate. Next remove the transmission cover in front of the seat and fenders and then the right step plate. You should now be able to see the large rear idler/tightener pulley as well as the two smaller guide idlers over which the belt runs. From here it should be easy to determine which pulley has the bad bearing.

According to JacksSmallEngines.com all of these pulleys and the belt are still available from Massey. While there, I would replace the belt as well as check that the transmission pulley is not loose on the shaft and that the cooling fan is good and not hitting anything. AgcoPartsBooks.com has the parts book online for this tractor that will show you all of the parts and part numbers you will need.
 
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