It is a great Door Operator. There are 2 types of control for the 6970 Operator, Saturable Reactor or Resistance control. The procedures for adjusting are very different. First determine which control you have. If you stop leaks the temperature variation can be controlled by using Mobil One Oil in the check unit. Also the big screws on the top ends are checks and there is a horizontal screw in the ends that determines check distance. Straight up and down with the horizontal screw is the Shortest check distance. Rotating the horizontal screw off straight up and down will Increase the check distance. Make sure the oil level is correct or the checks will not work correctly.
