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I have a John Deere D105 that seems to have a belt slipping but I'm not sure where to go with it at this point. When the blades are engaged they spin but begin to slow down and speed up randomly, to the point that the mower will idle and die. I've replaced both the deck belt and transmission belt that runs to the front of the machine. As far as I can tell all the bearings seem to be fine as well. Any ideas? Thanks.

dvmullins said:

I have a John Deere D105 that seems to have a belt slipping but I'm not sure where to go with it at this point. When the blades are engaged they spin but begin to slow down and speed up randomly, to the point that the mower will idle and die. I've replaced both the deck belt and transmission belt that runs to the front of the machine. As far as I can tell all the bearings seem to be fine as well. Any ideas? Thanks.

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almost Sounds kind of like an engine issue to me.... Do the engine RPM's fluctuate too?

Not that I've noticed.

do you have the right belts, remove them, spin each Idler to see if they growl and the same with the spindle bearings, start simple if you say that the motor runs good if not sure that would be the time to test the engine to see how it runs.

I have the right belts but noticed some extreme wear on the spindle pulley covers. Took those off and they sound like sand is in them so I've got some spindles on the way.