3,000 hours or every 5 years. Northern equipment and machine sells the timing belt and tensioner for $105. it's a heavier duty kevlar version. they also rent the official Duetz tension Gauge for $60 per 10 days($800 new) I just did this and it went amazingly well, the engine starts unbelievably better. I have an 863F with 2,460 hours. these engines seem to be very sensitive to precision. Make sure to follow instructi
Discuss this in the forum topic Bobcat 863F timing belt questions.