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Old 09-14-2013, 01:55 AM
Ridin' Green Ridin' Green is offline
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Join Date: May 2011
Location: Michigan
Posts: 10,597
Originally Posted by premierlawncaremi View Post
I have an eXmark 60" with Ultra Cut deck and an Ultra Vac system. I have been dealing with a "brown strip" issue all summer and I've done EVERYTHING possible to try and fix it and nothing seems to help. Here is a list of all the things I've tried:
- Adjusted scalping wheels and didn't change anything.
- Checked to make sure deck was not bent.
- Check tire pressure and actually swapped both tires to see if that was an issue.
- Both front tire bearings have been replaced, no slop at all.
- Checked spindles and swapped two spindles to see if that would help and did not.
- Iv'e leveled the deck probably 8 times. Both blade tips measure exactly the same height on both sides.

I have a feeling it is getting "too much suction" if that is even possible thus cutting the outside stripe shorter because the grass is standing up higher? Is it something with my Ultra Vac? It still seems to do it when the bagger is off but not near as bad, if at all. The weird thing is if you get down and actually look at the grass closely it doesn't appear to be cut shorter in the spot where the strip is. Any ideas?? This one might take a pro!
In the pictures look for a brown line on the left side of the pass (right side of deck)
Seeing that the brown strip is only at the discharge side, I doubt it has anything to do with the blades really. I am guessing it has much more to do with your blower for your bagger. I have an old JD garden tractor that I use for certain applications, some of which are bagging up thatch raked up in springtime. The blower head rubs the grass surface on that side and leaves a similar mark to the stripes (which that old tractor does remarkably well, and I've posted the pics to prove it).
I run a JD with a MOD deck for my main mower though, and when the chute is blocked off, I get a similar line. I know what causes it though- it is from all that air hitting the chute blocker and having nowhere to go but down, it actually blows a depression into the grass along the right side of my stripe.

Since you are running a blower for your bagger, maybe you are experiencing something similar with either the unit dragging the grass surface, or the airflow being more than the blower head can take at one time. If that's true, then maybe switching to a medium lift blade will help.

Good luck.
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