To adjust the wheel alignment on a JOHN DEERe D140 lawn tractor, first ensure the tractor is on a level surface. Check the front wheels for any visible misalignment; they should be parallel to each other and perpendicular to the ground. If adjustments are needed, loosen the tie rod ends and make minor adjustments until the wheels are aligned. Finally, retighten the tie rod ends securely and test the alignment by driving the tractor straight.
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