Mercury Mariner Outboard 225 3 Litre Service Manual 1994, Page 12Get this manual
45 Place rear thrust hub on propeller shaftPlace locking tab washer on propeller shaft, then thread propeller nut on shaft
Power Trim System
GENERAL INFORMATION The power trim system is filled at the manufacturer and is ready for useTrim outboard through entire trailing range several times to remove any air from the systemThe trim system is pressurized and is not externally ventedThe outboard can be raised or lowered manually by loosening the manual release valve to turnsThe trim angle of this outboard is not adjustableThe trim system has an internal valve which will automatically stop the outward trim travel at 20 when engine RPM is approximately 2000 RPM or higher; outboard also has to be in water and in gearThe outboard can be operated beyond the 20 trim limit for operating outboard in shallow water if engine RPM is kept below approximately 2000 RPM
6Place propeller nut into recess in locking tab washer and torque propeller nut to 55 lbft(74.6 Nm)Verify nut is recessed into tab washer while applying torque78Bend tabs from locking tab washer down into grooves of propeller hub to secure propeller nutAfter first use, bend three tabs straight and retorque propeller nutl55 lbft(74.6 Nm)) Bend tabs down into propeller hub grooves (check periodically for tightness