Tools and Materials:
- 3mm Allen T-Handle
- 2.5mm Allen T-Handle
- Skate T-Tool
- Motor Arm Glue
- Thread Lock
- Heat Gun (or Hair Dryer)
Here is an example of a loose motor arm. If your board is having this issue, please follow the process below.
Use the Skate T-Tool to remove the axle nut and outer speed washer.
Pull off the Drive Wheel away from the drive train. If they get stuck pull the drive wheel spacer and flanged bearing off as well. Put to the side.
One speed washer should remain on the axle.
Use the 3mm Allen T-Handle to remove the two screws holding on the belt cover. Put the belt cover and screws to the side.
Remove the belt put it to the side.
Use the 2.5mm Allen Wrench to loosen the three set screws holding the motor arm in place, by turning them counter clockwise. Remove these screws and set them aside.
There are three set screws holding each motor arm. In order to access the third screw, you will need to remove your rear hanger by following these steps.
You may need to heat the axle and base of the motor arm with a heat gun (or hair drier) to soften the glue and loosen the screws more easily.
Note: Be careful to not strip the screws. If a screw will not loosen, do not force it to do so.
Apply glue around the axle / motor arm interface. It is better to apply too much glue than not enough, but be careful not to get it on the steel axle.
Rotate and jiggle the motor arm so the glue shifts into the interface.
Next, apply glue to the backside of the motor arm, all the way around the motor arm. Again, rotate the motor arm so the glue shifts into the interface.
You may also add motor arm glue into the set screw holes before re-installing the set screws.
Set the loose motor arm so it even with the correct motor arm.
Use the 2.5mm Allen Wrench to install and tighten the motor set screws. Do this within 5 minutes of applying the glue to hold the motor arm in place while the glue is still malleable.
Note: Although the glue will set it approximately 5-10 minutes, do not ride your board again for 12-24 hours to allow the glue to fully cure. Failing to do so may result in your motor arm coming loose again.
If you removed the rear hanger to access the third set screw, re-install it according to these steps on how to lift your rear hanger.
Once mounted and the kingpin has been tightened, replace the drive belt.
Use the 3mm Allen T-Handle to replace the screws securing the belt cover. Put a drop of threadlock onto the threads near the end of each screw.
Note: Do not over-tighten the screws!
Replace the drive wheel. Install the rear wheel spacer (taller than the front wheel spacer) and then the flanged bearing.
Make sure this flanged bearing is pushed all the way in and is sitting flush.
Make sure the inner speed washer is present.
Slide the whole wheel assembly onto the axle.
You may need to twist the wheel while pushing to get the drive gear teeth to catch the belt.
Make sure the drive wheel teeth properly catch the belt.
Install the outer speed washer, then the wheel nut.
Use the Skate T-Tool to tighten the wheel nut. Tighten it to the point where there is no horizontal play.
Note: Although the glue will set it approximately 5-10 minutes, do not ride your board again for 24 hours to allow the glue to fully cure. Failing to do so may result in your motor arm coming loose again.
Motor Arm Tightening Kit
"Motor Arm Tightening Kit"