Tech Tip # 1 - How tight do I need my pump drive belt?

Unlike v-belts or serpentine style belts, toothed belts like HTD and Gilmer do not need to be overly tight. The teeth on the belt are doing the work instead of friction. A good rule of thumb is that you should be able to turn the belt 90º and see the teeth on the belt in the center of the belt between pulleys. Do not be alarmed if it appears that belt seems to be bouncing or flapping while the engine is running. If you over tighten these style belts they can walk off the pulley or cause premature wear to your pulleys.