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Check the propeller hub centre hole (highlighted in the figure): replace the hub if it shows signs
of wear or damage.
Check the key: replace the key if it shows signs of wear or damage.
Check the bushing of the transmission cover: the side surface must be smooth and free of signs
of wear, otherwise it must be replaced.
Check the 3 bearing seats: there must be no polished areas. Also measure the diameter of the 3
seats, the table shows the factory settings.
Dimension
2
3
4
Cosmos 300 – Maintenance manual – V2
Factory settings at 20° C
(mm)
51,965-51,985
36,980-36,996
51,976-51,995
126
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