ray several things I would think of is this . the allen key should be self tightening so pull the motor string pay attention to the rotation of the impellar and the allen bolt should loosen in reverse of the rotation . and going by that assumption I would assume the impeelar is splined internally . which atthat point use a heat gun toslowly and carefully heat around the cone area of the impeelar by the bolt and soak it in wd-40 while hot so it can soak in easier. try not to heat the bolt hole .you want the impellar to get slightly larger then the shaft so it slides off easier as well as get the oil in easier ray
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ray several things I would think of is this . the allen key should be self tightening so pull the motor string pay attention to the rotation of the impellar and the allen bolt should loosen in reverse of the rotation . and going by that assumption I would assume the impeelar is splined internally . which atthat point use a heat gun toslowly and carefully heat around the cone area of the impeelar by the bolt and soak it in wd-40 while hot so it can soak in easier. try not to heat the bolt hole .you want the impellar to get slightly larger then the shaft so it slides off easier as well as get the oil in easier ray
Keene 3x4 high pressure pump,, question ?? all the other impellers spun off is this one splined ??