1974 Johnson 135 HP Outboard Motors Service manual, Page 74Get this manual
GEARCASE
The gearcase and hydraulic assist shift consist of:The rlriveshaU and pinion gear; The forward and reverse driving gea rs; The propeller shaft; The shifter clut ch dog, shift rod, shift rod end plunger; The hydraulic pumppush rod, and assist cylinder; The gearcase lubricant; The assist cylinder valve controlled from the remote control unit
The hydraulic pump mounted in he forward end of the gearcase and driven by the forward gear utilizes the gearcase lubricating oil to supply the (orce needed [or shiftingThe shift od controls the assist cylinder valve which directs the hydraulic force to assist in placing the lutch dog in the selected positionsSee Figures 6-4, 6-5 and 6- 6