1990 Johnson Evinrude 120 thru 140, 185 thru 225, 300 HP, P/N 507875, Page 402Get this manual
Description of Operation The power trimtilt unit consists of manifold that contains all valving, oil reservoir, oil pump, electric motor, and two hydraulic trim cylindersAttached to the manifold is the combination hydraulic tilt cylinder and shock absorberThe entire assembly is attached to and contained completely between the stern bracketsThe manifold is connected to the stern bracketsTrimming is accomplished by the trim cylinders pushing on the swivel bracket at the thrust padsBy operating the electric switch in the UP direction, the electric motor drives the hydraulic pump, forcing oil into the trim cylinders and the tilt cylinderBecause of mechanical and hydraulic advantage, the trim cylinders move the motor the first 15 of movement (trim range)The tilt cylinder moves the motor through the final 50 of motion (tilt range)The outboard can be operated while tilted past the initial 15 for shallow water drivingAbove approxima'tely 1500 RPM, the trim-up relief valve opens automatically, lowering the motor to the fully trimmed out position Attempts to tilt the motor when operating over 1500 RPM will have no effectOperation of the unit in the down direction is the opposite of movement in the up directionThe tilt cylinder moves first until the swivel bracket is resting on the trim rods, which then begin to move