Kubota L4701 cruise control not staying set diagnosis and repair

This is a specific troubleshooting fix, not a general overview: the owner diagnoses why his L4701's cruise control lever won't stay engaged, finds a missing spring linked to the cruise-set mechanism (likely torn off while brush-clearing), orders the replacement part, and installs it under the tractor, verifying spring tension against the workshop manual's 15-20 lb spec. Useful for L4701 owners with this exact cruise control symptom.

Posted by an owner-operator (a hobbyist working his own homestead property, not a mechanic by trade) documenting his own repair process.