2001-2002 Yamaha 50HP F50Z/T50Z Ouboard 4-stroke engines service manual, Page 33Get this manual
Technical tips Stopping condition When the power trim and tilt switch is not pushed (released), the gear pump does not pump the fluid, the up-main valve and the down-main valve are closed, and the power trim and tilt fluid pressure in the system remains constantThis allows the ram to maintain its position until the power trim and tilt fluid flows through the system againWhen the outboard motor hits something in the water The check valve of the trim cylinder and the tilt piston absorber of the tilt piston help to prevent internal damage to the power trim and tilt unit and help to protect the bracket and lower unit from damage in case the outboard motor hits something during operationWhen the outboard motor hits something, highly pressurized fluid in the upper part of the power trim and tilt cylinder pushes down the check valve of the trim cylinderAt the same time, fluid pressure in the upper part of the trim cylinder increases and the tilt piston absorber is pushed downAs result, the tilt piston and the ram are pushed up without the free pistonThe tilt piston is stopped before reaching the top of the trim cylinder by the damper function of the tilt piston absorber to protect the power trim and tilt unit from damage