69J3D11 1-24123456789Trim-down and tilt-down functionWhen the PTT switch is pressed to “DN,” the power trim and tilt motor operates the gear pump andfluid pressure is generated. As a result, the fluid pressure pushes the down-shuttle piston upward,enters the tilt cylinder upper chamber through the down-main valve, and then pushes the tilt ramdownward.In addition, the fluid pushes the up-shuttle piston downward to open the up-main valve.The gear pump draws the PTT fluid from the tilt cylinder and trim cylinder lower chambers, and thenretracts the tilt ram and the trim ram.Since the fluid pressure from the gear pump is applied to the tilt cylinder upper chamber, the tilt rammoves downward first.The hydraulic oil flows into the trim cylinder upper chamber from the reservoir.When the outboard motor comes in contact with the trim ram, the trim ram moves downward simul-taneously with the tilt ram, due to its own weight and the suction of the PTT fluid by the trim cylinderlower chamber.1 Tilt ram2 Tilt cylinder3 Trim ram4 Trim cylinder5 Power trim and tilt motor6 Reservoir7 Gear pump8 Up-shuttle piston9 Up-main valve0 Down-shuttle pistonA Down-main valveÈ ReturnÉ Send:: S69J1440Technical tips
