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Cuts uneven, lawn looks terrible. Missing half

Cuts uneven, lawn looks terrible. Missing half the grass. blades are sharp. What's is going on?

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Are your blades upside down? Mower deck level?Proper air pressure all 4 tires?Correct blades for the diameter of cut? Deck bent? Deck hangers bent?

Posted on May 29, 2010

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Our Craftsman 42" lawn mower was cutting uneven. It was not the deck, the blades, the wheels, or the deck height adjustment. It was cutting uneven because in order for a mower to blow air out, it has to draw air in. The area where the aluminum bearing housings are mounted in the mowing deck were clogged with clippings, mud, leaves, etc and the air was unable to pass thru. In order for the deck to blow air out, air must be allowed to be drawn in around the outside of the cast aluminum housing where it is mounted on the deck. If the air cannot pass thru then it creates a vacuum drawing the mower deck towards the ground. Solution: clean the venting around the bearing housings and it will solve your problem and you will have your brand new mower back.

Posted on Apr 28, 2013


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Posted on Jan 02, 2017

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How to fix a riding lawnmower that is cutting grass unevenly

Check that blades are sharp and not bent. You may need to dismount the whole deck from the machine. Turn it upside down and clean all accumulated grass and gunge from inside the housing. Check that the spindle bearings are tight and not floppy. If they are, replace them. Remove seal from inside of bearing so grease can enter when servicing the bearings. Do not over grease and blow outer seal out. When you have checked that 1. Bearings are sound, 2. Blades are sharp. Blades are balanced. This may require placing a rod in the vice and putting blade so it swings freely. Grind more off the low end until it sits level. 3. Check that blades are not bent. To do this tie a builder's line across the edges of the deck over any wear guides. Make sure they are the same height each side. Get a ruler or a block that just fits beneath the string on the end of the blade. Rotate half a turn and measure the other end. They should be the same. 5. Check that the blades match in the centre. EG they must must not be any difference in height at all. The string line will tell you whether the spindles are the same height and also whether they are in the same plane. If not, you may have to remove them from the housing and clean the matching surfaces spotless and then pack with thin washers or strips of thin tin or shimm material until blades are a good match. It is surprising how many machines are not properly done in the factory. . 6 Make sure the blades are not worn out. If ground back too far they leave a ragged finish with bruised cut ends that look bad. The ends doing the cutting can be higher than the blade inside and thus rubbing on the grass. If all these things are right, reassemble mower and drop deck into working position. Measure from a flat floor to the blade ends so they are the same on each side of the machine. Adjust by screwing the hanger threads as required. Blades should be flat as if they are low either front or back the cuts will be hollow in the middle and leave a wavy surface behind.

Aug 14, 2014 | Mtd Yard Machines 38-Inch 12.5 HP...


How to keep a nice green lawn.

I find it is wise to sharpen the lawn tractor or even the lawn mower blades at least every three weeks depending the hours your unit has run. You will find the grass looks better being cut with sharp blades .Dull blades tears the grass and your lawn will bruise and turn yellow as well

on Aug 15, 2014 | Garden

1 Answer

I have weed eater/poulan 22" push lawn mower. It

Hi goldengear...

Make sure you have installed the blade on the right way, if it is installed upside down then it will "beat" the grass instead of cutting it and make a terrible cut, also make sure the blade is good and sharp.
The rough running may be due to trash in your carburetor, I would advise to clean your carburetor and also check you fuel tank for trash, water,etc. if there is any trash,water,etc in there then you need to also clean the fuel tank.
Do one more thing and check/clean/replace your fuel filter if you have one.
Please take time to rate me

Aug 18, 2011 | Poulan "Poulan" Push Mower

2 Answers

The mower runs over the grass but leaves much of it uncut

You can look at two items.
One is your mower level. If you are up on one side it will cut uneven.
Check your blade it might be bend or dull and not cut good.

Jul 21, 2011 | Garden

3 Answers

My mowers cuts uneven I replaced the blades but it still cuts uneven how can I level it?

Park mower on a level flat surface ( a concrete garage floor is ideal ) lift deck up until you can put a piece of a 2x4 flat underneath the deck and lower deck until it just contacts the 2x4. loosen adjustment nuts or turnbuckles and adjust until the deck just starts to clear the 2x4. this should level your deck. Now , lift the deck and remove the 2x4. put blade height lever on a known cut length and with a tape measure, measure the tips of the blades from the floor to the blade tip...they should all be the same within 1/8 of an inch...if not then you either have a bent blade, bent spindle shaft, or spindle bolts are loose or misaligned. Your deck could be warped too...depending on how hard a lick it took...good luck !!! ;-D

Jun 24, 2010 | Craftsman 20 hp 42 in. Deck Lawn Tractor -...

1 Answer

The mower is mowing uneven in the front. what can i do? it seems that it is scalping the grass but both sides are level

Look under the mower deck. If you can't see well and work on it, you may have to remove the mower deck and flip it over on the ground. Grass and mud buildup in the decj could cause a blade to pinch grass, 'scalping' the lawn. Clean it all out. Dull blades cause cut grass to look torn and brown. Remove and sharpen. Bent blade will cause uneven cut. Replace it. Good luck! Please rate if you found this helpful, thanks!

Jun 05, 2010 | Mustang Rzt 50" Zero Turn Riding Lawn...

1 Answer

I have a Craftsman 42" rider cuts uneven

Check your tire pressure first, uneven tore pressure will cause this problem.On the rear of cutting deck on both sides there are height adjustments, if your deck has a rear roller this also can be adjusted to compensate,If your a stout person sitting on tractor can cause unevenes.

Jun 25, 2017 | Craftsman 42 in. Deck 19.5hp Lawn Tractor

2 Answers

Uneven grass cutting

I have seen dull blades, blades not installed right and an un-level deck cause that.

Hope this helps.

Sep 21, 2009 | Craftsman 17.5 hp 42 in. Deck Lawn Tractor...

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