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Linear servo retainer replacement for e-flite mcx

How the heck do you get those little buggers on?

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It isn't a great solution, but i was able to get one of these retainers back on. Using only the screwdriver in the kit, and my thumbnail. Try to work in a well-lit, clean area, so if the retainer gets loose, you can find it. Should be obvious, but Make sure the power is disconnected to the heli

--Heli Dis-assembly--
First, disconnect the two servo pushrods from the swashplate. Unless you want to replace the swashplate, be careful not to break the connecting ball off.

Second, disconnect the two motors from the control unit. Be mindful of the direction they need to be reconnected (white/black on outside, blue/orange on inside--in that order)

Third, using the provided screwdriver, remove the two screws holding the control unit on the heli. pull it off the chassis, but be mindful of the Antenna wire. I would try not to bend this more than you have to.

-Retainer installation-
Fourth, lay the control unit on the clean flat surface, pull the servo gear shaft slightly out of the unit until it is flush with the plastic.

Fifth, Carefully drop the retainer next to the servo. Using the tip of the screwdriver, apply enough pressure to the retainer to guide it up the plastic to match the hole with the shaft.

Sixth, Apply gentle but firm pressure upwards on the gear shaft. this should push the retainer onto the shaft just enough for it to hold on.

Seventh, using your thumbnail on one hand, and the tip of the screwdriver with the other, apply pressure to both sides of the retainer to slide it down the shaft. *NOTE* This is where i had the retainer flip off the gear shaft multiple times, only to have to repeat steps 4-7.

Eighth, Begin re-assembly in reverse order from steps 1-5. Reattach the canopy, and power, and attempt flight. If it spins uncontrollably, make sure that you have the motors hooked back up in the correct polarity (otherwise it spins in the opposite direction)

-Tiny tweezers don't seem to allow for enough force to push the retainer onto the shaft
-A standard screwdriver of comparable size to the provided phillips head screwdriver may allow for more pressure to be applied
-The retainers like to spring off of the shaft when pressure is applied in the wrong place-- hence the clean surface to find them when they do.
-I can't seem to find anywhere that sells only the servo retainers, so if you lose them, you may need to purchase the entire servo assembly. :(
-I know check these retainers as both pre and post flight checks to ensure that they are securely into place. They seem to like to pop off during very hard collisions (which is how mine came off)

Posted on Feb 18, 2009

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