Pro Boat PRB4000BDC - Manual (Page 9)

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 3. Use needle nose pliers to grab the flex
shaft, removing it from the lower end.
 4. Use a paper towel and rubbing alcohol
to clean the flex shaft.
 5. Apply a waterproof marine grease to
the flex shaft. We recommend the Pro
Boat marine grease available at your local
hobby dealer.
 6. Apply a small amount of Pro Boat
Marine grease (PRB0100) through the
small hole in the brass ferrule to lubricate
the propeller shaft.
 7. Reverse the previous steps to
reassemble the flex drive in the motor.
You will need to rotate the parts slightly
so they key back together correctly
during assembly.
Removing the Motor Cover
The cooling lines are located under the motor
cover. If you find water is not flowing through
the lines, you will need to remove the motor
cover and check the lines for blockage.
 1. There are four screws on the motor
cover you will need to remove to access
the motor and cooling tubes.