Same basics as I told you about doing the power turnup.
Remove the top of the IP, unhook the linkage and slide the shaft out. Pry out the seals, replace and reinstall the goodies.
Not a bad job just go slow and be careful when reassembling the little creature so that things are where they need to be.
Make sure when you turn the key on that the pump goes CLICK if it dont click you have something in wrong and if started could run away.
Care is the Buzzword here.
MGW