Small Engine Troubleshooting Problems? Ask a Mechanic Now.
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Do the wheels seem to straighten when you go backwards?
There are two bushings in the center of the front axle that may be worn or broken. This will allow the axle to move and cause the wheels to not run straight. The only other thing that might cause this is if the drag links are bent but according to your information you have already checked those.
It is reference number 67 if you are looking at a parts break down with a part number of 194737, it takes two one in front and one back.
Realigning the gears in this instance will not help you. If you try to move the gears to different position it will only make one side worse than the other.
You have bushings or bearings in the center of the wheels as well. You may want to check those but that is the only other place that comes to mind other than the drag links being bent themselves.