CV Joint

The Constant-Velocity Joint allows a rotating shaft to transmit power through a variable angle, at constant rotational speed, without any significant increases in friction or play. CV Joints are commonly used at ends of the axle halfshafts on four wheel drive ATVs.

These joints are very strong and low maintenance. The most common maintenance item is to check the condition of the  rubber gaiter (dust/weather boot) that covers the joint is secure and not split. If the gaiter is damaged, the molybdenum disulfide grease with which the joint is packed will be thrown out. The joint will then pick up dirt, water, and small rocks and cause the joint to overheat and wear. The grease can also contaminate the brakes. In worst case, the CV joint may disjoin causing the vehicle to stop moving or lock up, rendering the ATV incapable of steering.