2003 ST 4 Stroke 9.9/15HP Johnson outboards Service Manual, Page 182Get this manual
LOWER UNIT REASSEMBLY AND INSTALLATION
PINIONDRIVE SHAFT
Install: Thrust washer CD Thrust bearing Thrust washer Shim Pinion gear Drive shaft Circlip (J) (Qty2) Bearing
SHIFT ROD ASSEMBLY
InstallShift rod CD Shift rod boot Shift rod guide a-ring a-ring Washer Shift cam (J) Spring pin (Qty2)
Triple Guard Grease
Install: Shift rod assembly CD Shift rod collar Washer Nut NOTE: Ensure that the "Stepped" section of the shift cam is facing rearward (in direction of propeller)