Mercury 300R HD CMS Mechanical, Operation And Maintenance Manual, Page: 70 / 99

Two anodes are located on the engine; one anode is on the bottom of the
transom bracket assembly and the other is on the gear housing.
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Propeller Replacement—31.75 mm (1‑1/4 in.) Diameter Propeller
Shaft
!
WARNING
Rotating propellers can cause serious injury or death. Never operate the boat
out of the water with a propeller installed. Before installing or removing a
propeller, place the drive unit in neutral and engage the lanyard stop switch
to prevent the engine from starting. Place a block of wood between the
propeller blade and the anti‑ventilation plate.
1. Shift the outboard into neutral position.
2. Place a block of wood between the gearcase and the propeller to hold the
propeller and remove the propeller nut.
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3. Pull the propeller straight off the shaft. If the propeller is seized to the
shaft and cannot be removed, have the propeller removed by an
authorized dealer.
4. To aid in future removal of the propeller, liberally coat the propeller shaft
splines with one of the following Mercury/Quicksilver products:
MAINTENANCE
60
eng