Sudden change in B2920 engine sound?

[493mike]

I was snow blowing and back blading around my driveway last week when the tone of the machine deepened. It stayed that way for maybe 20 minutes, until I finished working. Oil was full. In neutral it went away. I believe it was engine/exhaust related. The tractor was warmed up when the tone changed. Any ideas?
Mike

 

[mcfarmall]

Regen? My tractor sounds different when doing a regen than it does normally.

 

[whitetiger]

You may very well have gotten your air filter damp or restricted by snow or frost.

 

[jkrubi12]

Check air inlet for obstructions; snowplowing sometimes introduces snow buildup on the air filter.

See this thread:

Air filter clogged with snow

I have a B2650 and for the last 4 years have struggled with snow clogging my air filter. The symptoms are while blowing snow always at around the same area of my driveway my engine would start to lug and blow black smoke. I would then have to bring the tractor inside and remove the air filter...

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