Chrysler 100, 115 and 140 HP Outboard Motors Service Manual, OB 3439, Page 195Get this manual
With the Outboard in the lowest position, motor leg closest to the transom, both cylinders are fully retracted Moving the switch to the lift position activates the drive motor clockwise electrical circuit will cause the thermal relaywired in series with the brushes, to openFigure 2Moving the switch to the lower position activates the motor counterclockwiseThis reverses the direction of fluid and directs pressure to the rod end of the cylindersThe weight of the outboard on the tilt cylinder causes the tilt cylinder to retract firstWhen the outboard contacts the rod end of the trim cylinder, both cylinders retract together until fully collapsed Figure 3Position control of the outboard, once adjusted to the proper angle, is maintained by lock-up of the hydraulic systemDamage to the outboard from under water obstructions is avoided by spring loaded check valves in the tilt cylinder and hydraulic pumpThese valves relieve excess pressure and allow the outboard to pivot up while traveling in forward or in reverse Figure 4