Introduction

The drone arms of the UDI U818A are probably one of the most complicated parts to replace in the drone without requiring any fabrication of parts.

  1. Using  a #PH000 screwdriver, remove the 5mm screws retaining each propeller to the rotating post.
    • Using a #PH000 screwdriver, remove the 5mm screws retaining each propeller to the rotating post.

      • As each screw is removed, safely pull the respective propeller from its apparatus.

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  2. After removing the propellers, unscrew all 4 (3x3mm) screws connecting the electronics to the frame.
    • After removing the propellers, unscrew all 4 (3x3mm) screws connecting the electronics to the frame.

    • Once all of the screws holding the plastic dust cover to the frame are removed, pull the 2 LED bars through the dust cover and remove the thin plastic dust cover from the drone.

      • As the piece connecting the electronics to the drone cover are accessible, keep note to not remove electronics until after disconnecting the drone head lamp first.

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    • Step two is disconnecting and removing the head lamp.

      • Use a screw driver to remove the 5mm screw. Remove head lamp of drone.

    • Disconnect the electronics from the frame of the drone by pulling each arm out of the hole in the frame holding it in place.

    • Do not try to separate the frame from the electronics yet! Check to see if there is tape holding the head lamp wires in place underneath the electronics.

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    • If present, remove the white tape over the black and red wires for the head lamp with a metal spudger (a wide flat-head tool for separating plastic parts).

      • If tape is removed, keep in reusable condition to re-secure the headlight later so there are no loose wires.

    • Separate the plastic tabs securing the motor arms to the drone cover and delicately pull out the arm. Do this for all 4 arms to remove the frame from the cover.

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    • Use a #PH000 screwdriver to remove all 4 (5mm) corner screws that secure both the receiving board and the motor arm.

    • Notice how the wires tuck neatly in the bottom channel of the motor arm.

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    • Carefully slide the arm out from the socket.

    • Use a metal spudger, plastic removal tool or tweezers to remove the connectors from the receiving board.

    • The cables connecting to the receiving board will be secured with a light adhesive that can be easily scraped away to remove the desired connector.

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    • Motor direction and propeller direction is crucial to proper flight, refer to this format.

    • The Front Left motor identified by the Red/Blue wires is a Standard(Clockwise) spinning motor, it pairs with a White A2 propeller.

    • The Front Right motor identified by the Black/White wires is a Reverse(CounterClockwise) spinning motor, it pairs with a White B2 propeller.

    • The Back Left motor identified by the Black/White wires is a Reverse(CounterClockwise) spinning motor, it pairs with a Black B1 propeller.

    • The Back Right motor identified by the Red/Blue wires is a Standard(Clockwise) spinning motor, it pairs with a Black A1 propeller.

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    • The wiring can appear confusing, don't be alarmed. It's quite easy, and absolutely necessary for proper flight.

    • The 4 bottom connectors receive the motor power cables that are Red/Yellow wire pairs from each motor. Counting the sockets 1-4 from left to right.

      • Front Right motor connects to socket 1.

      • Front Left motor connects to socket 2.

      • Rear Left motor connects to socket 3.

      • Rear Right motor connects to socket 4.

    • The Red/Green wire pairs from each motor power the LED to that branch, they connect to 4 of 6 sockets on the top of the receiving board. There is no sequence required.

    • The headlight LED, and underside LED bars connect to the remaining 2 sockets on the top of the receiving board. Again, no sequence is required. All LED Red/Black and Red/Green wire pairs connect to top of the receiving board.

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Conclusion

To reassemble your device, follow these instructions in reverse order.

3 other people completed this guide.

Anthony Mitchell

Member since: 03/23/2016

757 Reputation

5 Guides authored

Team

5 Comments

Very helpful, thanks!

Cam F - Reply

One of my prop motors stopped so I replaced the arm as described above but when I plug in the battery the prop spins. Then when I turn on the controller and calibrate it stops spinning and the other props spin

Fran Herman - Reply

Same problem here, Fran. How'd you solve it?

Tom Hallman -

Same issue as above. just replaces the front right arm/engine. When reconnecting, the replacement arms spins as soon as the battery is connected. Only way to stop it is to unplug it. Tried plugging other original arms into in and they do the same? Is this a mother board issue instead?

DaveDaughe - Reply

Same as above. Replace and arm/engine. When I plug it in, it spins constantly, unless I unplug the battery. Plug one of the other original arms into in and they do the same. Assuming this is now a mother board issue vs an arm/engine issue?

DaveDaughe - Reply

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