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Below is a link to a video I made of the noise. At about the 3-4 second mark when I engage the blades is when the noise starts. I'm not talking about the squeal the belt makes when engaging the blades. There is almost a knocking noise. Would a loose belt make this noise? Thanks in advance.

Those units have blades which are timed and they may be hitting each other if the belt came loose and the belt jumped. Tip the mower on it’s side, carb up, and check to see if the blades come close to each other. They should form a T, 90 degrees off if correct.

Not the blades. They are in a T.

Any other thoughts/ideas before I have to resort to taking it in?

Thanks.

Have you taken the belt cover off? Could be idler pulley. Lots of videos online about the Timemaster

As gotomow stated, next step is to remove the belt cover and check the timing belt and pulleys. If they are all in good condition then check the drive belt and pulley. To do this, put handle in the vertical position, tip the mower on its side, carb up, and inspect.

Did you ever figure out the noise? I have a similar noise, went ahead and changed out 2 idler pulleys, 2 belts (not the timing belt) and one spindle which I thought had a little play. still making noise. I am the master of hunt and peck

Hey folks, just checking if anyone was able to solve this, i have the exact same issue :-(

Have you checked the blades? Are they 90 degrees apart? Have you remover the cover and checked the belt and timing pulleys?checked

Rivets said:

Have you checked the blades? Are they 90 degrees apart? Have you remover the cover and checked the belt and timing pulleys?checked

Click to expand...

Thank you for the reply Rivets, im almost 100% certain blades are perpendicular. I will check again because you never know. I will take a few photos and videos. I promise to paypal you for a six pack of your favorite "soda" for the help pal.

Will check when i get home from work.

Thanks and take care!

-Jonathan

Sounds like a bearing failure to me. Remove the blade drive belt and spin the blades by hand to see if you feel any roughness. Spin the pulleys by hand to see if there is any slop, wobble or roughness in them as well. If the spindle bearings are bad, they can usually be replaced without replacing the entire assembly, as long as the housing is intact and the the spindle shafts are not gouged /worn. Not a hard job and bearings are only around $9 apiece (2 per spindle). Good luck!