Yamaha F100B F100C Outboards Factory Service Manual, Page 27Get this manual
Technical tips PTT (power trim and tilt) unit (F100B)
The circuit of the PTT unit and the location of its major components are shown in the illustration below
Lower chamber shuttle valve Up-relief valve Pump chamber Down-check valve Check valve Tilt ram Trim and tilt housing Reservoir Filter screen Shock valve Passage to reservoir Free piston check valve Trim ram Shock return valve