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When the gear mesh is adjusted properly, you should
feel only a very small amount of play between the gears. If
the gears are too tight, it will cause excessive strain on the
gear box and motor. If they are too loose, they will probably
strip out after a short period of time.
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To adjust the gear mesh, use a # 0 phillips screwdriver to
loosen the two screws holding the gear box to the motor.
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Once the screws are loosened you can adjust the height of the gear box assembly. When you are satisfied with the
alignment, tighten the two screws securely.
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Double check the gear mesh. If you are satisfied that it is correct, apply a couple of drops of machine oil onto the gear
box bearings and apply a light coating of grease to the gears. Rotate the prop shaft a couple of times to distribute the oil
and grease.
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Remove any excess oil using a paper towel and reinstall the motor assembly. Connect the motor leads to the ESC and
reinstall the propeller and spinner assembly.
The motor and gear box that are installed in the Fokker are nearly maintenance-free, but there are a couple of things you
can do both to prevent premature wear and to ensure that you're getting the most from your motor and gear box assembly.
All electric motors accumulate dust, dirt and grime after hours of running. If too much of this builds up, it can lead to
performance loss and cause premature wear. Following the simple procedures in this section will help you get the most
out of your motor and gear box.
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Remove the spinner and propeller assembly and set them aside. Disconnect the motor leads from the ESC.
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Remove the two wood screws holding the motor assembly in place and pull the motor from the fuselage.
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Using Performance Plus Motor Spray, carefully spray the inside of the motor, through the two motor openings. Hold
the motor up and over an old towel while doing this. Spray the inside of the motor until the liquid runs clear.
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Set the motor on the towel and spray the gear box assembly to remove any dirt and dust. When you're done, use paper
towels to completely dry off the outside of the motor and the gear box.
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Apply a couple of drops of machine oil (or sewing machine oil) to the two motor bushings and gear box bushings.
Turn the prop shaft a couple of times to distribute the oil.
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Now check the gear mesh. While holding the motor with one hand, lightly grasp the prop shaft and rotate it back and
forth very gently. You don't want to turn the shaft, just be able to feel the play in the two gears.
SECTION 18: MOTOR MAINTENANCE