There are a number of reasons why a Uhing drive can slip. These are the four most common reasons: The wrong kind of lubricant has been used. Never use oil, silicone, WD-40, graphite or another lubricant that reduces friction. The load (for example a wire guide roller) is too heavy or it has been mounted in such a way that it is placing overturning moments of force on the Uhing drive. The four screws used to mount the load to the top of the Uhing drive are too long. The Uhing drive is very old (more than 10 years) and the bearings are worn down. Used properly, a Uhing drive will not slip. Please contact Amacoil if your Uhing drive is slipping.