Principles Of Power Trim And Tilt Operation Description - Suzuki GF60A Service Manual

2B-3 Power Trim and Tilt:

Principles of Power Trim and Tilt Operation Description

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By motor operation, the geared pump will be driven, and by turning the motor to the right or to the left, oil flow will
change its direction. This causes "UP" and "DOWN" movements of the piston rod of the tilt cylinder.
Trim / Tilt Up Circuit
When the PTT switch is operated "UP" position, the electric motor and gear pump (1) will operation on clockwise
direction.
"Upper main valve" (2) will open, allowing oil to flow from the reservoir to pump.
Oil flow from the pump enters the spool valve (3), moving it to the right, opening the "Up check valve" (4) and returning
oil from the upper cylinder chamber (plus oil from the reservoir) to the pump.
Pressure built up by the pump will then open the "Down check valve" (5) and oil will enter the lower cylinder chamber.
This makes the piston rod push up and the engine tilt up.
When trim motor stops, both the "Down check valve" and the "Upper check valve" will close to retain trim / tilt position.
In the trim area, the trim piston and floating tube are moving with piston rod.
When full trim / tilt up position is attained, sustained operation of the "up" relay will have no effect, as pump oil flow will
be returned to the reservoir through the "Up relief valve" (6).
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