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Discussion Starter #1
X300, 42" deck with mulch kit.

Thought it was the blades, so i bought new blades from the dealer. (AM140973) blades are installed on correct side and facing the proper direction.

right side cuts what appears to be perfectly, yet the left side looks like it's accomplishing nothing.
Blades are both spinning, I cleaned out the deck.
There is no looseness or wobble when the blades spin.
also, the blades appear to perfectly align with each other in the middle for comparison.

not sure how clear it will come across in the photo.
 

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Have you checked if your mower deck is level? That's where I would start. If you are 100% sure that the one blade is not on upside down.
Low/wrong tire pressure can also cause a problem like this. So be sure to check it before leveling the deck.
 

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Discussion Starter #3 (Edited)
I do have an issue with the front right tire losing air pressure, but it is currently full and it didn't affect it previously.

I will check if properly level tonight when I get home
 

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I do have an issue with the front right tire losing air pressure, but it is currently full and it didn't affect it previously.

I will check if properly level tonight when I get home

That would make sense if the right side is cutting lower than the left. It doesn't take a lot of pressure loss to effect the quality of the cut. Plus them small front tires don't hold a large volume of air. So a little bit of loss makes a big difference. The front wheels on my old L108 were the same size as yours. I had to frequently keep after the pressure and they didn't have any leaks.

I have a theory that making frequent sharp turns with them little wheels was slowly burping the tire beads. Not to mention cross cutting hills. Really noticed this Sunday when I went to cut my daughter's place. They have a small Husky lawn tractor with the same size wheels. It probably set in a storage trailer for over a year. She got it out to tow my JD 10P utility cart. After doing her hauling she left the 2 in the middle of the front yard. I went to move them onto the driveway and couldn't believe how hard it's steering was. The tires were obviously low on pressure from sitting. I turned the steering wheel to the lock and pressed the forward pedal. The tractor didn't even try to turn. It just plowed ahead like the tires were pointed straight. The tires flexed so much I thought it was going to pop the tire beads off the wheels.

Any idea what is causing your tire to lose pressure?
 

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Discussion Starter #5
Looks like they sold me the wrong blades. They replaced AM140973 (Stamped as LEFT and RIGHT) with AM141033 (Which are two blades stamped RIGHT) and everything is working as expected.
 
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