The process of bleeding a power steering pump on a 6.7 Cummins is not overly complicated, but it does require attention to detail and precision. First, you will need to locate the bleed valve which can be found near the top of the power steering reservoir or about halfway up the side. Make sure that all hoses and lines have been disconnected from the pump before attempting to open any valves. Once you've located the bleed valve, use an appropriate wrench or socket set to loosen it slightly. This should create some air bubbles in the system if there is too much air trapped in your power steering fluid then it could cause resistance when turning and other issues while driving. Once these bubbles are visible, close off the bleed valve tight again and start filling up your reservoir with fresh power steering fluid until it reaches its maximum capacity level indicated by a fill line within your cap or dipstick tube. Finally, start up your engine after making sure all connections are secure again, then turn your wheel back-and-forth several times at low speeds for two minutes each direction so that any remaining air pockets can escape through their respective lines as they become filled with new liquid instead.