Make sure the transaxle disengagement lever is not in the neutral position. On most lawn tractors, this lever is a stiff wire -- sometimes with a loop on the end -- that sticks out of a slot above and to the right of the trailer hitch bracket on the rear panel, below the seat. Most tractors move under their own power when the wire is all the way in, and can be rolled around without the engine running when the wire is pulled out.
SOURCE: Sears lawn tractor. While mowing, ran over a
the branch probably got cought in the belt that runs the rearend it may have caused it to come off check the drive belt
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: I have a 20 hp craftsman lawn( hydro gear
It sounds like the oil in transaxle is degraded.The transaxle is supposed to be a sealed unit requiring no service but over time the oil will get dirty enough to cause problems like you are describing.Remove the back hitch plate and look at the transaxle it will have a rubber vent hose or a 1/4 alllen wrench fitting on top. You will need to purchase a battery suction bulb from sears automotive and use it to remove as much oil from transaxle as possible. Warm the transaxle up first by running it around,then suction the oil out.Refill with a good synthetic motor oil 15w-50 or 20w-50 like Amsoil or Mobil 1.Do not use transmission fluid or hydraulic fluid. When adding the new oil back fill it to within 1.5 in from the top,be sure to allow this amount of air space in top of transaxle for expansion.
SOURCE: How to replace drive belt craftsman tractor
There is a video on YouTube that may help you somewhat with the belt replacement. You may want to check it out. Here is the link. Sure hope this helps and best wishes.
http://www.youtube.com/results?search_query=lawn+mower+belt+replacement&search_type=&aq=1&oq=lawn+mower+be
Testimonial: "Good, quick feedback - thanks --"
SOURCE: transaxle locked in gear won't roll freely in neutral
Sounds like the pins in your brake caliper have gotten dirty and/or rusty and are not releasing all the way. When I had my shop, we found a lot of these and I or my mechanics pulled and cleaned them then took a drill 1/64th larger than the pin and ran it through the holes in the caliper, NO MORE PROBLEMS!
Check your tire pressures, too, if they are low it will be difficult to roll.
Testimonial: "Thanks for your help. My brake caliber pin is called a dowel pin. I put WD-40 on it, worked the brake and the pin released. Tractor rolls freely now! "
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