1990 Johnson Evinrude "ES" 60 thru 70 Service Manual, P/N 507873, Page 266Get 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