1978 Johnson 175, 200, 235 HP Outboard Service Manual, Page 181Get this manual
Mark thrust rod location and remove rodRemove three screws, port and starboard, holding power -rim assembly to stern bracketsRemove both stern bracketsRemove spring clip from tilt cylinder pinSupport weight of power trim unit while removing tilt cylinder pinSee Figure 9-11Testing and repair of the unit will be easier if pair of stands is usedThey can be fabricated from 14" or 516" (6 or mm) aluminum stockSee Figures 9-7 and 9-12 VALVES AND PISTONS Manual release valve is removed by removing snap ring with number snap ring pliersValve is then removed from cavitySee Figure 9-13
1Snap ring 2Manual release valve