1990 Johnson Evinrude 120 thru 140, 185 thru 225, 300 HP, P/N 507875, Page 381Get this manual
Inspection INotel Before inspecting components, thoroughly clean them with mild aerosol solvent and blow dry with shop air of not more than 25 PSI (172 kPa)1Inspect the pump housing and gerotor All components must be perfectly clean Mating surfaces must be flat and have no irregularities Gerotor and housing must not be scored or worn6346
1331 Gerotor
must be flush with upper surface of pump
housing
O-ring grooves must be smooth and free of nicks2Inspect the reservoir and its internal components All components must be perfectly clean All fitting threads and seal areas must be smooth and free of nicks The shaft and pulley tapers must be clean and smoothThey must not show any signs of fretting The bearings must be quiet and must not bind when rotated by hand Check the relief valve seats, balls, and guides for nicks or distortionAssembly INotel The seal and O-rings necessary to assemble the pump and reservoir are available in OMC O-ring Kit .PIN 985330 O-rings are identified by dimensions in this assembly procedure (1.0x thickness in inches)If removed, install new lower shaft bearingPlace the lettered end of bearing against OMC Installing Tool PIN 912101 and press into placeThe 1f4 in(6,3 mm) spacer must be used with all CC and newer model engines; CU and older models do not require this spacer when using OMC Installer PIN 9121011351 2Support the bearing cone and press pump shaft into the