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UDI U818A Drone Arms Replacement

This guide will service the replacement of the drone arms, which hold each propeller, motor, and wires that bring power to the motors/propeller.

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.

Step 1 Drone Arms  ¶ 

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

Step 1 Drone Arms  ¶ 

  • 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.

Step 2  ¶ 

Carefully slide the arm out from the socket. Use a 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.

Step 2  ¶ 

  • Carefully slide the arm out from the socket.

  • Use a 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.

Step 3  ¶ 

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.

Step 3  ¶ 

  • 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.

Step 4  ¶ 

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

Step 4  ¶ 

  • 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.