Small Engines (Lawn Mowers, etc.): TORO model 20067 mower self/propelled, assembly drawings, noise sound

Question
When using self propel, mower makes very loud noise; not using s/p  sounds normal.  This machine has been used maybe 150-hours.

Thank you for your kindness.

Answer
Hello Troy:

>>Sorry for the Delay. I was Tied up with Drs Appointments All Day and was Not Able to Answer Questions Yesterday. Thanks.
>>What Does the Noise Sound like?
>>Is it a Squealing, Grinding or Banging Noise?
>>From your Description it can be a Bad Transmission, a Bad Wheel Assy or a Bad Drive Belt.
>>You can View a Breakdown/IPL of the Mower at this Site Addy, https://lookup3.toro.com/partdex/default.cfm and Select Start Parts Viewer. Now Enter the Model Numbers (20067) and Click Search. Now Select View Assembly Drawings for your Year Model.
>>Thanks.

Respectfully

John

>>PS: I am Allowed to Answer 5 Questions a Day. If you See I am Maxxed Out, then Try Submitting your Question at or Just After 8pm EST (US). My New Day Starts then. Comments and Ratings are Greatly Appreciated. Thanks.

Respectfully

John