The pump body and stainless steel plate above it should come off with the gear case. It is held in place by the spring plate underneath it. There is sometimes corrosion around the stainless steel that sticks it in place. Be sure all projections line up with there corresponding notches on re-assembly. Always use a rich fuel mix. (A quart of oil to 4 gallons of gas) That model has all bronze bushings and the crankshaft counter weight on the top cylinder tends to rob oil from the top connecting rod.
