Chrysler 75 and 85 HP Outboards Service Manual OB 3646, Page 191Get 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 The motor drives the hydraulic pump which directs fluid under pressure to the base of the trim cylinder and tilt cylinderThe trim cylinder has larger diameterIt activates first because the larger area of its piston results in more lift forceWhen the trim cylinder has extended fullythe tilt cylinder begins its travel continuing until the outboard is raised to its highest position At the end of the tilt cylinder's travel, the drive motor will stallIf the control switch is held too long, overloading the
electrical circuit will cause the thermal relaywired in series with the brushes, to open Figure 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 fi rst When the outboard contacts the rod end of the trim cylinder, both cylinders retract together until fully collapsed Figure 3Position control of the outboardonce adjusted to the proper angleis maintained by lock-up of the hydraulic system Damage 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