2001 Edition Yamaha F225A and LF225A Outboards Service Manual, Page 27Get this manual
Technical tips Trim-up and tilt-up function When the PTT switch is pressed to "UP," the power trim and tilt motor operates the gear pump and fluid pressure is generatedAs result, the fluid pressure pushes the up-shuttle piston upward, enters the trim cylinder and tilt cylinder lower chambers through the up-main valve, and then pushes the tilt ram and trim ram upwardIn addition, the fluid pushes the down-shuttle piston downward, opens the down-main valve, and returns the PTT fluid from the tilt cylinder upper chamber to the gear pumpThe fluid from the trim cylinder upper chamber then returns to the reservoirThe tilt ram and the trim ram extend simultaneously, and after the trim ram has extended completely, the tilt ram operates to tilt up