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How to Make an Axial Ax10 to a Slower Crawl

The Axial Ax10 Scorpion is a 1/10-scale remote-controlled "rock crawler" that features a 27-turn brushed motor, four-wheel drive, three-link suspension with oil-filled shocks, 2.2-inch tires and ball bearings throughout the drivetrain system. In order to reduce the vehicle's crawling speed and increase torque, Axial recommends swapping out the original 20-tooth motor pinion gear for a smaller 14-tooth unit. Replacing the original pinion gear is an easy task that only takes a few minutes to complete.

Things You'll Need

Allen key set
14-tooth pinion gear
Small strip of paper

Instructions

- 1
  Remove the body clips from the left and right side body posts. Remove the body from the chassis.
- 2
  Disconnect the battery pack from the electronic speed control to prevent inadvertent motor engagement.
- 3
  Examine the center section of the chassis, and then locate the cylindrical-shaped electric motor. Examine the front side of the motor. Locate the small pinion gear and larger spur gear.
- 4
  Loosen the two Allen cap screws, which are located to the left and right of the pinion gear, using an appropriately sized Allen wrench.
- 5
  Slide the motor away from the larger spur gear. Loosen the small set screw, located on the collar portion of the pinion gear, using an appropriate size Allen wrench. Slide the old pinion gear off the motor shaft.
- 6
  Thread the setscrew into the new pinion gear if necessary.
- 7
  Slide the new pinion gear on the motor shaft. Align the pinion with the spur gear, and then tighten the setscrew. Ensure that the setscrew tightens against the flat machined portion of the motor shaft.
- 8
  Place a small strip of paper between the teeth of the pinion and spur gear. Slide the motor towards the spur gear, and tighten the two Allen cap screws that secure the motor in place.
- 9
  Rotate the spur gear to test the gear mesh. If the small piece of paper features small dimples from the gear teeth, the gear mesh is correct. Readjust the motor if the tightness of the gear mesh causes the paper to shred or if the gears are spread too far apart, causing minimal contact to the strip of paper.
- 10
  Reconnect the battery and replace the body to finish the modification.

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