You will have to take a rigid putty knife and go around the centerline of the pump and break loose the old gasket that has set up like glue. When you get it loose, use a pry bar to separate the two pump halves. The packing material around the pump shaft can also become so hard that it can prevent the shaft from moving. Inside the pump housing are two brass impellers and two sets of one way valves. Be sure you observe how the valve assemblies fit into the interior of the pump housing. Once you get the two halves apart, take a wire cup brush on a drill and polish up the inside of the housing where the brass impellers move and polish the sides of the brass impellers. Then, rub bearing grease or chassis grease in the two areas where the impellers (paddles) rub on the steel housing. It is a tight fit to put the two halves back together because the two brass impellers must fit tight against the inside of the steel case.
Joe

Last edited by model72; Fri May 20 2016 12:39 PM.