The power trim/tilt system is a hydro-mechanical or electrically controlled system allowing the stern drive to be raised when moving through the water at speed, when approaching the beach or shore and when trailering the boat. It can also be adjusted through-out trims range while the boat is underway and at any speed.
An electric motor, controlled by a switch and relays, provides the power for a hydraulic pump. The pump, in return, forces fluid trough a set of hydraulic cylinders. The fluid will flow into one end of the cylinders to raise or lower the drive unit.
The power trim/tilt system consist of a valve body, hydraulic reservoir, electric motor, trim/tilt switch, trim sending unit, and down solenoids, trim indicator gauge, trim limit switch, two hydraulic trim cylinders, and the necessary hydraulic lines and electrical harness for the system to function perfect.
The manifold, hydraulic reservoir, electric motor, and up/down solenoids make a single unit known as the pump assembly that is mounted inside the boat. Two hydraulic trim cylinders are mounted, one each side, of the stern drive unit. One end of the cylinder is connected to the gimbal housing and the opposite end is attached to the drive housing.
The trim sender unit is mounted on the starboard side of the gimbal ring and is connected
To the trim gauge on the control panel trough the wiring harness. When the stern drive is trimmed “in” or “out” the gauge moves to indicate the stern drive position.
A trim limit switch may be connected to the “up” solenoid on the trim/tilt hydraulic pump. This limit switch allows the stern drive is moved out past the support brackets und high throttle setting could impose high stress loads on the boat transom and loss of the steering control. There may also be a 10am circuit breaker or fuse serving the same purpose.