Try to search some videos on youtube about this. I always do this. I like gardening and lawn care, I have beautiful yard! I do all job myself, there are many different tools which help me. For example recently I bought riding mower for steep hills(for details click here), very comfortable in use!
You have an adjustment for that deck on that model to the left and to the right of the seat. Raise the deck as high as you can raise it and then measure from the bottom of the deck to the blade on each side. If you're within an eighth of an inch or so then you're okay. Beyond a half an inch difference you need to adjust accordingly using a wrench and those adjustments on either side of your seat that connect to that deck. It's pretty obvious what adjustments I'm talking about and not difficult to find. Adjust and measure from the same points on the left and right side until you are within that eighth of an inch or less. If it is a double nut then make sure you tighten that second nut in order to keep it from moving on you in the future. Do that both sides and that should even it out good enough for you to mow without leaving a wedge in your yard. You can adjust the front to back with the same kind of adjustment in the rear behind the seat. Follow the same directions as before when you adjusted it left and right, if your over 1/2 inch off on your measurements. Bottom line is three places to adjust is left, right, and back of the seat. Measure bottom of deck 2 blade to get your measurement to adjust if needed. Adjust and secure back the second nut to keep it from misalignment again. It should go without saying but I'll say it anyway. Take the key out of the ignition before you jack with the blades you do not want to be known as stumpy Joe by your friends and neighbors. Good luck
Https://www.youtube.com/watch?v=FqTE7h5zJAA
Below might be easier than measuring of blade.
https://www.youtube.com/watch?v=YChJqEJUPss
https://www.youtube.com/watch?v=-AgOJrp5sNE
https://www.youtube.com/watch?v=MlsF_OQv3qQ
https://www.youtube.com/watch?v=ig7mES1mrH8
https://www.youtube.com/watch?v=JG__wlitH_I
SOURCE: how to install mower deck belt on a lt1000 craftsman riding mower
The manual will cover it.
http://www.disruptit.com/manuals/L0104168.pdf
SOURCE: Craftsman riding mower blades will not engage
maybe the safty switch under seat might be starting to go out if that switch doesn't work the blades wont come on at all for safety
SOURCE: 18hp craftsman riding mower model#917.255913. won't turn left!
I have had this problem for the longest time. I replaced the secondary gear twice. Helped for a brief period and now won't turn left again. Replaced the steering shaft and worked for a brief period. Back to no left turns once again. The issue is with the secondary gear and bearings (plastic) which is only a temporary fix. What I had done was welded a piece of steel to the bottom of the steering shaft eliminating the secondary gear connecting directly to the tie rod for the steering. Works perfect now.
SOURCE: How much oil does my craftsman riding mower hold? ...
4.5 pints with filter or 4 pints without
SOURCE: I purchased a used Craftsman LT 1000 17 hp 42"
I've had to do this at least 5 times. If you look under the body, there are two supports that carry the mower deck and lift and lower it. Each of these has a nut that holds up the deck and the nut is on a stud that goes up and down when you raise or lower the lever. Put the deck in the middle of it's range, around #3, make sure the key is off, move your blades so they are on the right and left edge of the deck.
Get yourself a device to measure blade to ground height, I have a block of wood that is 3 inches long. Make sure your floor or ground is level and tires are properly pumped up. Then raise or lower the adjustment nuts until both sides are equal height.
Gary
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Usually answered in minutes!
I love the YouTube music but not a big follower of their DIY because even though there's a lot of very good advice on there, you have to have a basic knowledge already of what you're doing or you're playing Russian roulette. If the video says to measure from the blade to the ground if you're on a solid foundation then that's probably the go to advise. I actually meant to add that there are a couple of options when measuring, but didn't.
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