Maintenance35Checkpoints Check each of the propeller blades forwear, erosion from cavitation or ventilation,or other damage. Check the propeller shaft for damage. Check the splines / shear pin for wear ordamage. Check for fish line tangled around the pro-peller shaft. Check the propeller shaft oil seal for dam-age.NOTE:If the shear pin equipped: it is designed tobreak if the propeller hits a hard underwaterobstacle to help protect the propeller anddrive mechanism. The propeller will then spinfreely on the shaft. If this happens, the shearpin must be replaced.EMU30660Removing the propellerEMU29194Spline models1. Straighten the cotter pin and pull it out us-ing a pair of pliers.2. Remove the propeller nut, washer, andspacer (if equipped).3. Remove the propeller and thrust washer.EMU30670Installing the PropellerEMU29231Spline modelsCAUTION:ECM00340 Be sure to install the thrust washer be-fore installing the propeller, otherwisethe lower case and propeller boss couldbe damaged. Be sure to use a new cotter pin and bendthe ends over securely. Otherwise thepropeller could come off during opera-tion and be lost.1. Apply Yamaha marine grease or a corro-sion resistant grease to the propellershaft.ZMU018971. Cotter pin2. Propeller nut3. Washer4. Propeller5. Thrust washerZMU0287723451