Yamaha F225A Service Manual page 28

GEN
INFO
Trim ram retraction function
When the outboard motor is tilted up and held in place with the tilt stop lever and the PTT switch is
pressed to "DN," the trim ram will be retracted.
Although the gear pump attempts to draw oil from the tilt cylinder and trim cylinder lower chambers,
after the PTT switch has been pressed, fluid cannot be drawn from the tilt cylinder lower chamber
because the tilt ram is secured in place by the tilt stop lever. Only the PTT fluid from the trim cylinder
lower chamber can be drawn, and as the fluid pressure decreases, the trim ram retracts into the trim
cylinder. Since the tilt ram is secured in place, the PTT fluid pumped by the gear pump flows into the
tilt cylinder upper chamber to increase fluid pressure. As a result, the down-relief valve opens, and
the PTT fluid is released into the reservoir.
1 Tilt ram
2 Tilt cylinder
3 Trim ram
4 Trim cylinder
5 Gear pump
1-23
General information
6 Reservoir
7 Down-relief valve
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É Send
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S69J1430
69J3D11