1998 Johnson Evinrude "EC" Accessories Service Manual, P/N 520213, Page 121Get this manual
Tilt Mode or Shallow Water Drive Mode
[] While running in the shallow water drive mode, or while the motor is tilted, the following valves and seals are pressurized and must hold pressure: 1Shock absorber valves 2Tilt piston seals
in the tilt cylinder piston
3Manual release valve
4Seals in trim pistons 5Trim check valve 6Tilt check valve
7Trim-up relief valve At approximately 1500 PSI (10300 kPa) the trim-up relief valve will open, allowing the fluid to return to the reservoirand the filter valve CD will open, replacing fluid to the top of the tilt cylinderThe tilt cylinder will retract, lowering the motor to the fully extended trim rodsRetraction of the trim pistons, under thrust, is prevented by the trimtilt separation valve Q) and the trim check valve The expansion relief valve will remain closed