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post #1 of 12 (permalink) Old 07-25-2020, 06:23 PM Thread Starter
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Uneven Cutting

I have a JD STX38 black deck. I have replaced both blades, one spindle and leveled the blades and deck several times and cleaned the underside of the mowing deck and still have an uneven cut line. Does anyone have any suggestions what I might try next.

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post #2 of 12 (permalink) Old 07-25-2020, 11:28 PM
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What do you mean by uneven cut ?

A test I do is to hold a sharpie pen on the end of the blade tip so it will draw a line around the inside of the deck
Do it with both ends of both blades
You should end up with one strait line from one side of the deck to the other .
If the line has a slope then the deck or the housing is bent.
If you get multiple lines on either end then that blade is bent.

When you leveled the deck I hope you weremeasuring from the blade tips to the ground & not the side of the deck to the ground .
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post #3 of 12 (permalink) Old 07-26-2020, 10:29 AM Thread Starter
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Hi Bert, I actually had the deck off and checked the blades with a straight edge across the bottom of deck from several points. Leveled on the mower with a blade leveling tool and I still have one narrow strip of grass in the cut area.
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post #4 of 12 (permalink) Old 07-26-2020, 12:43 PM
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Quote:
Originally Posted by TinmanDave View Post
Hi Bert, I actually had the deck off and checked the blades with a straight edge across the bottom of deck from several points. Leveled on the mower with a blade leveling tool and I still have one narrow strip of grass in the cut area.
ok well that takes care of making sure the blades arent bent but it has no bearing on the deckside to side height adjustment

set deck to a low setting just enough to slide a board under it and then you adjust both sides at the same spot to the same height, what i mean by that is, if you measure the front corner on one side, then you do it at the same front corner spot on the other side and not from the front on one side and rear on the other.

thats how you level a deck, what you did was make sure the deck was cutting level but not that the deck itself was hanging level from the mower

You can only learn if you ask the question, so there are no dumb questions.
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post #5 of 12 (permalink) Old 07-26-2020, 02:51 PM Thread Starter
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Did all that too, have a set of jigs cut at various heights so I can check at different height adjustment levels. Its just a small strip of grass that stands up. I even tried changing the spindles from side to side. I'll remove the deck again to check for cracks, maybe something that opens up once the blades are engaged.
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post #6 of 12 (permalink) Old 07-28-2020, 03:40 PM
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A strip of higher grass, are the blades the correct length? They should almost touch


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post #7 of 12 (permalink) Old 07-28-2020, 09:51 PM
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WAs the spindle you replaced exactly same as the old one...in mounting height, shaft length ? If it is...wonder if the remaining spindle is slow, dragging and causing poor cut...? But I would think you'd hear the belt slipping....assuming you have checked the belt is tight when engaged..
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post #8 of 12 (permalink) Old 07-30-2020, 11:42 AM
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Did you happen to double check the tire pressure? The front and back tires need to be equal pressures left to right, not necessarily front to back but definitely left to right. Even a slight pressure difference will make a difference when you are on the mower vs standing beside it to check the level
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post #9 of 12 (permalink) Old 08-03-2020, 02:48 PM Thread Starter
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Yes they are very close to the edge of the deck, and are a JD OEM blade
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post #10 of 12 (permalink) Old 08-03-2020, 02:49 PM Thread Starter
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Yes the spindle was an OEM JD part. The other spindle spins freely and the belt tension is good
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