2004 SR Johnson 2-stroke 40, 50HP Service Manual, Page 271Get this manual
TRIM AND TILT HYDRAULIC SERVICING WARNING
There may be high pressure behind some power trim valvesTo avoid injury when removing manual release valve, be sure to cover valve with shop cloth until the pressure is releasedWear safety glassesInspect the manual release valveDiscard the 0rings on the housing
IMPORTANT: Before removing manual release valve, relieve pressure by fully extending cylinderScrew the manual release valve inRemove the retaining ring using small pick or screwdriver