1975 Johnson 4HP 4R75, 4W75 Outboards Service Manual, Page 48Get this manual
DISASSEMBLY OF GEARCASE aRemove propellerbRemove the water pump screws and lift pump and driveshaft from gearcaseRemove water tube grommet from pumpSee Figure 6-4
dDisassemble propeller rubber slip clutchSee Figures 6-6 and 6-7eRemove the two screws holding the gearcase head or bearing retainer to the gearcaseRemove gearcase head or bearing retainer by withdrawing the propeller shaftSee Figures 6-6 and 6-7fSlide gearcase head or bearing retainer from propeller shaft and remove sealsSee Figure 6-6gThe standard gearcase pmlOn gear slides outTo remove the weedless gear case pinion gear, it is first necessary to remove thrust bearingSee Figure 6-7Tap the gearcase on bench or insert the driveshaft and tap on the end of it to dislodge the bearingPinion gear can then be removed