Vex Robotics Vex Edr 393 Gear Replacement Repair Guide

Difficulty

Easy

Steps

Time Required

                          5 minutes

Sections

Motor Gears
7 steps

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Introduction

What you need

Step 1

              Motor Gears

Disconnect the motor from any other connected devices or power sources.
Use a Small Phillips Head Screwdriver to unscrew the four screws from the black casing’s corners.

Disconnect the motor from any other connected devices or power sources.

Use a Small Phillips Head Screwdriver to unscrew the four screws from the black casing’s corners.

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Step 2

Pull off the black bottom casing.
Remove the two gears inside.

Pull off the black bottom casing.

Remove the two gears inside.

Step 3

Select the replacement gears that match the gears you just removed.
Take the gear that has teeth on its entire length and insert it onto the metal pin. Push it all the way into the bottom of the motor. It should connect with a small gear on the bottom.
Now, insert the larger gear with teeth on the base onto the circular plastic peg.
Make sure the gears are aligned. Spin the top gear with your fingers a few times to double check.
Replace the black bottom casing and screws.
The screws are susceptible to stripping so do not over-tighten them.

Select the replacement gears that match the gears you just removed.

Take the gear that has teeth on its entire length and insert it onto the metal pin. Push it all the way into the bottom of the motor. It should connect with a small gear on the bottom.

Now, insert the larger gear with teeth on the base onto the circular plastic peg.

Make sure the gears are aligned. Spin the top gear with your fingers a few times to double check.

Replace the black bottom casing and screws.

The screws are susceptible to stripping so do not over-tighten them.

Step 4

Use a Small Phillips Head Screwdriver to unscrew the four screws from the green casing’s corners.

Use a Small Phillips Head Screwdriver to unscrew the four screws from the green casing’s corners.

Step 5

Pull off the green top casing.
Remove the two gears inside.
The small gear on the left is attached to the motor module itself and cannot be removed.

Pull off the green top casing.

The small gear on the left is attached to the motor module itself and cannot be removed.

Step 6

Replace the old stripped gears with the remaining replacement gears.
Place the gear with the long stem into the larger gap.
Make sure it catches on the gear at the bottom.
Place the smaller gear into the motor.
Make sure that it catches on both the tiny gear attached to the motor and the long stem gear.

Replace the old stripped gears with the remaining replacement gears.

Place the gear with the long stem into the larger gap.

Make sure it catches on the gear at the bottom.

Place the smaller gear into the motor.

Make sure that it catches on both the tiny gear attached to the motor and the long stem gear.

Step 7

Replace the green top casing.
Ensure the casing fits between the ridges on the wires’ rubber collar.
Use a Small Phillips Head Screwdriver to replace the four screws.

Replace the green top casing.

Ensure the casing fits between the ridges on the wires’ rubber collar.

Use a Small Phillips Head Screwdriver to replace the four screws.

Your motor should be working again. Before reinstalling it on your robot, test it either with a backup battery or by plugging it in to your cortex. If you hear more grinding or anything out of the ordinary, reopen the motor to make sure the gears are aligned.

You can also use this process to change the gear ratio of the motor for different functions.

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Author

                                      with 7 other contributors

                    Colin McInerney

Member since: 05/31/2016

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Team

                       Central Coast New Tech High, Team 4-6, Rushing Spring 2016                        

                                                  Member of Central Coast New Tech High, Team 4-6, Rushing Spring 2016 



                    CCNTH-RUSHING-S16S4G6                     


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                                            1 Guide authored

Bob Hankinson - Apr 17, 2017

does anyone sell repair kits from broken off wires. I have 30 motors with wires torn off (because of the 100 students)

Introduction#

What you need#

Team#

Introduction

What you need

Team