1988 Johnson/Evinrude "CC" 40 thru 55 Models Service Manual, Page 300Get this manual
Description The power trimtilt unit consists of hydrau lic trim cylinderhydraulic tilt cylinderand bi-directional motor pump assembly Bracketing to attach the unit to the motor, remote control switch, trim gauge and cable assembly are also included in the complete, hydraulic unitThe ends of the hydraulic cylinders are attached to removable bracket mounted on the motor swivel bracketTilting is accomplished by the hydraulic cylinder pushing or pulling on this bracketPressing the upper portion of the rocker switch energizes the electric motor-driven pumpOil pressure is applied below the trim and tilt cylinder pistons which operate together in the trim range of the unit (approximately 46mm (1 -1316") of piston travel) resulting in usable pitch change in outboard motor angle from 00 to 150 with force capable of overcoming full engine thrustAn internal piston stop in the trim cylinder is reached at this point, forcing the entire hydraulic flow to operate the tilt cylinder as single cylinder lift at faster rate of travel for the tilting function The reduced mechanical advantage of the single cyl inder range of operation keeps the motor gearcase from tilting out of the water except at very low (1600 or lower rpm) engine speedsPressing the lower portion of the rocker switch reverses the electric motor-driven pump, returning the outboard to the desired position, at which point the switch is releasedThe dash mounted trim gauge, which operates whenever the ignition switch is on, uses variable resistance sending unit built into the trim cylinderThe power tilt motor has thermal overload protection switch built into itIn the event of an overload on the electric motor, the temperature rise causes the thermal switch to open Preventing damage to the electric motorThe switch closes as the temperature normalizes in about one minuteA screwdriver-slotted manual release valve isbuilt into the hydraulic system to allow manual raising and lowering of outboard motor in the event of electrical failureThe "'