Mower leaving lines advice

m8man

Moderator
Cut a ton of grass here, maybe 10 acres. Lately my mower been leaving lines, thought it was usual blade issues so I sharpened them, no go still sucked. Bought new JD blades installed them same result, I have 3 blades and it leaves 2 strips, sort of a line between each blade. Checked deck level and seems ok. Any thoughts? I almost wonder if blades are to short idk.
 

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euphoric1

Well-known member
did you measure the blades to see if they are correct? how did you measure deck level? when you rotate the blades the tip should come pretty close to the one next to it, from the looks of it I would say either blades are too short, not to ask stupid question but do you have the sail of the blade up in the deck? meaning blades arent on upside down? those are pretty extreme mowhawks, when you rotate the blade tip to the one next to it are they at the same height? I would start with having wrong blades possibly, then I would compare height of blades to the ones next to them. That is definitely not a "level" or "pitch" issue. and make sure when you level the deck you are not measuring off the pan, measure off blade tips. and you want 1/4 to 3/8 pitch also front to back as well... front of deck being lower than the back. level should only be side to side, not front to back. I would start with the blades. did you possibly hit something and tweak the deck where spindle sits, thats where I say make sure the blade tips are at same height as one next to them, have had to take the persuasion mallet to some decks through the years at my shop.
 
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m8man

Moderator
did you measure the blades to see if they are correct? how did you measure deck level? when you rotate the blades the tip should come pretty close to the one next to it, from the looks of it I would say either blades are too short, not to ask stupid question but do you have the sail of the blade up in the deck? meaning blades arent on upside down? those are pretty extreme mowhawks, when you rotate the blade tip to the one next to it are they at the same height? I would start with having wrong blades possibly, then I would compare height of blades to the ones next to them. That is definitely not a "level" or "pitch" issue. and make sure when you level the deck you are not measuring off the pan, measure off blade tips. and you want 1/4 to 3/8 pitch also front to back as well... front of deck being lower than the back. level should only be side to side, not front to back. I would start with the blades. did you possibly hit something and tweak the deck where spindle sits, thats where I say make sure the blade tips are at same height as one next to them, have had to take the persuasion mallet to some decks through the years at my shop.
I didn’t measure the blades just went to my dealer and said I needed new blades for my mower, gave em the model and cutting width.

ticks me off, but gotta figure this out. 4~5 hours to cut my place w a 62” zero turn and don’t wannna do it twice
 

gary_in_neenah

Super Moderator
Staff member
Wondering if those stripes line up with your rear wheels/tires? I'd also actually measure the grass with a tape or ruler. Is there a difference in height or just the appearance? Lastly, when did this begin? After you made a change in settings, blades, etc.

For what it's worth.... l've seen worse lawns. It's green and it's growing! That's half the battle right there!
 

wiharley02

Active member
euphoric pretty much hit everything to check! My first thought before reading his post was bent arbor/spindle or as he said bent deck in the spindle area. I think you're going to have to get on nice flat concrete and get underneath and take measurements blade tips down to concrete, with the blades in multiple positions in their rotation, mower off of course!!!!!!
 

euphoric1

Well-known member
I didn’t measure the blades just went to my dealer and said I needed new blades for my mower, gave em the model and cutting width.

ticks me off, but gotta figure this out. 4~5 hours to cut my place w a 62” zero turn and don’t wannna do it twice
I'm still betting wrong blades or sprung deck, when you get it straightened out just keep in mind when leveling, do not measure off deck pan and level only applies to side to side, for a deck to cut well you need pitch and I would favor the higher end of pitch from front to back 3/8"
 

mezz

Well-known member
I Googled "zero turn mower cut leaving strips", you should check it out. Brian is pretty spot on with his diagnosis. Sometimes it's better to let the dealer inspect, adjust & do annual maintenance. They do pick up & deliver too.
 

euphoric1

Well-known member
I Googled "zero turn mower cut leaving strips", you should check it out. Brian is pretty spot on with his diagnosis. Sometimes it's better to let the dealer inspect, adjust & do annual maintenance. They do pick up & deliver too.
30 years of doing this poop LOL!!
 
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