John Deere L118 Blades hit together

[bertsmobile1]

Not hitting every round doesn't sound like a blade problem. If the blades were hitting each other because they're too long, it would sound more like a machine gun.
Remove the deck belt and re-check spindles.

No that is exactly what happens
They strike each other for a few revolutions then they get in time because one blade slips on the belt till eventually it catches back up again when they will start to strike each other again.

 

[MParr]

I still believe that he has purchased the wrong replacement blades. The OP has only replied once and was talking about grinding some length off of the blades.

 

[StarTech]

Not hitting every round doesn't sound like a blade problem. If the blades were hitting each other because they're too long, it would sound more like a machine gun.
Remove the deck belt and re-check spindles.

Not necessary PT I had a Murray rider that one blade was tad too long and it randomly tagged the other blade due to slight difference in spindle pulley size.

 

[JD_Driver]

Buy new blades, they are cheap.

 

[eldowdy]

Buy a new set of blades. Those are too long.

Ed

 

[LMPPLUS]

John Deere L118 Replaced blades and belt. Mowes great but every so often I get a terrible noise for approximately 3 seconds when the blades strike each other. This happens approximately every 30-45 seconds. This is an older model and I don’t see anyway to set the timing. Do I grind the blades down so they can’t touch?

Deere shows this is not a timed deck, you may have a deck that's warped or bent.

 

[Gord Baker]

I recently helped a neighbour with this problem. He had the blades on upside down and the tips hit.
I didn't check but the Ends may not be 90°. Don't grind off the cutting tips, grind off the back side end if you decide to go that route. I suspect you have a loose spindle or Blades are not mounted correctly and tightened on the Spindle.