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check /replace blades
level up the mower deck
the blades have to be parallel to the ground so if wheels are worn or the deck tilts in any direction the cut will be uneven
Could be one of a few problems. Easiest... disengage the blades (engine off) and try to turn the blades by hand. If any blade is hard to turn your blade spindle(s) need to be serviced or replaced. Look for the belt tensioner, and see that it is not loose or out of alignment. Check all of the pulleys for damage. Make sure that you have the correct size belt! If you are mowing very heavy growth, you may be stopping a blade while mowing, and that will eat up a belt in a hurry.
Interesting! Try seeing if it will run without the fuel tank cap on. There is normally a small hole to let air in as fuel is used, if this gets blocked the fuel will stop running from the tank. You probably won't be able to clean it well enough so a replacement cap shouldn't be too expensive.
I gave up on mulching blades years ago for this sort of problem, but I think they have improved them since then. And your problem sounds a bit extreme. Are you certain that the blade is not upside down? (They look pretty weird and their correct orientation is not obvious.)
Your forward speed may be too fast for the mower blades to cut every blade of grass. It may be new, but check the deck to see if there are any dents pushing the quill assemblies up making the deck cut uneven. Or it may have the wrong blades on it. I have seen this problem in the past with a Gravely mower. The person was trying to cut grass to fast. He sold the unit and the new onwer did not noticed any the problems the old owner described.
The engine wont have an impact with the deck because its belt driven. It sure sounds like you have a bad set of spindle bearings,just turning it by hand you wont hear any noise it has to be going fast to hear it. The noise may be coming from your clutch instead of the deck,and it sounds like the deck. Have these things checked out.
a lot of problems here.try this.[grass buildup]. usually cause by damp grass or blades not going fast enough to throw into box.engine cutout is then caused by grass jamming blade[s]. backfire is usually too much choke or wrong petrol/air mixture.re bent grass.try cutting driving in reverse[if strip is wide cos of back tyre then blade is uneven.]
make sure when you replaced the spindles that you used all the washers and spacer bushings back identical to the ones you took off.
Make sure your deck isnt bent for some reason where the spindles mount and or the deck itself
level the deck when its on the mower on a level suface,side to side(level) back to front the back just a little higher than the front 3/8 inch or less
proper air pressure in all 4 tires
Also you could add a washer or take away a waher to allow the blades to become level at mid point meeting?
be sure to torque the blade bolts to 35 ft.lbs also
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