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why does my riding mower cut uneven

First, lets caution everyone that outdoor power equipment is inherently dangerous. Some precautions need to be observed:
Turn the unit off and remove the key. Disconnect the spark plug(s). Wear heavy leather gloves when working around the cutting blades. Never defeat the interlocks installed by the manufacture. Do not leave guards or deflectors off when you are done. Most important, read your owner's manual. The next thing to check are the basics. When did the problem start? Did you just install new blades? Don't laugh, are they on upside down? We often see mowers come to our shop for cutting problems that are as simple as low air pressure in the tires. If the tire pressure is not as recommended per the manufacture, the deck could easily be off by a 1/4 from side to side. Step cutting is sharp ridges left in the lawn surface. Step cutting is usually caused by mower deck damage, misadjustment, or mower blade damage. Normally the deck just needs to be re-leveled. To check for this: Park the unit on a flat surface. Manually turn the blades perpendicular with the direction the tractor is sitting. Measure the outer tip of the left blade to the surface your parked on (don't measure from the deck shell, it has to be from the blade tip). Write the measurement down. Go to the right side of the tractor and measure from the tip of the right blade to the surface. The two measurements should be the same.

If the measurements are a 1/4 or more off, it needs to be corrected. The next thing to do is to turn the blades and measure again. If the measurements are not the same, one of the blades is probably bent. Other things to check for are damage to the deck shell, and bent or loose spindles. Streaking is another common complaint. Streaking is when thin strips of uncut grass are left behind the mower. Streaking is usually caused by operator error or poor blade maintenance. Streaking can occur if the engine speed is too low. All mowers are designed to run at full throttle. Believe it or not you are doing more harm to your engine by running it slower than full throttle when you are mowing. Blades need to be spinning at the correct blade tip speed. They need to be sharp and not have too much wear on the uplifts. The speed and uplifts pull the grass up just like the barber lifts your hair up with a comb to get a straight cut. The air movement within the cutting deck is very important. Decks plugged with grass clippings can not move the air the way they were designed to do. Another cause of both streaking and step cutting is the design of the tractor and deck themselves. If the operator does not over lap the cutting row enough or makes very tight turns, marks can be left in the lawn. The easy way to see the cause of this is to use a jack to raise one rear wheel of the tractor a little off the ground.

If your tractor does not have a full free floating deck doing this will cause the deck to tilt. This tilting in tight turns and when one wheel is lifted higher than the other by uneven ground contours will leave marks. The only fix for this is to slow down, make wide turns, over-lap cuts, or buy another tractor with a free floating deck. Scalping is when the mower deck comes close to or hits the ground. Scalping can be caused by the mower deck misadjustment, unevenness in the lawn, or by the mower deck bouncing because the ground speed is too fast. Check the mower deck for misadjustment, slow down or raise the deck if its too low. These tips and guidelines should help you fix common mowing problems to keep your lawn looking the way you want it. Remember though, these are just guidelines. For specific information for the power equipment you are using always refer to your owner's manual. Safety Tips: Before servicing or repairing any power equipment, disconnect the spark plug and battery cables. Remember to wear appropriate safety glasses and gloves to protect against harmful chemicals and debris. Taming the wilderness of your yard can make you feel like you've conquered the world. But after spending an hour or so mowing the lawn, it's disappointing to look over your domain and see grass that is uneven or not completely cut.

Here are a few tips to help achieve a well-manicured lawn, leaving you time to spend a few leisurely hours enjoying the habitat you've created. For more advice about riding mowers and lawn tractors, check out our and. Slow down. The taller and thicker the grass, the slower you should go to give the blades time to lift and cut the grass. Mow at full throttle. Although your ground speed should be slower, the engine should be at full throttle for the right blade speed. Check the air pressure in the tires. Overinflated or underinflated tires cause the tractor to travel unevenly across the yard. Refer to your for the correct pressure. Level the mower deck. Leveling the deck under the tractor is essential to getting a smooth, even cut on your lawn. This Sears PartsDirect video shows you. Use sharp, straight blades. Inspect your blades before every use to see that theyвre sharp, straight and free of chips. at the start of each cutting season or any time you find damage. Clean the mower deck. A buildup of grass clippings under the mower deck interferes with airflow and grass clipping movement under the deck, hindering the lift of the blade. We have tips for. Overlap your passes. The blade extends only to the edge of the deck. Overlapping by just an inch makes sure that the lawn tractor blade reaches each blade of grass.

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