Assault AirBike, Replacing a Left Bell Crank

This article covers replacing the left bell crank on the Assault Air Bikes.

The image below shows an exploded view of the machine parts involved in this replacement.

 

Tools Required

  • 8mm Hex Wrench
  • Crank Puller, 22mm

Removing and Replacing a Bell Crank on an Assault AirBike

  1. Using the 8mm hex wrench, remove the crank bolt from the left pedal crank arm.
  2. Thread the crank puller into the crank arm and firmly tighten the top section using the crescent or adjustable wrench. Is this your first time using a crank puller? Watch our video about how to use a crank puller.

      Tech Tip

    If you do not tighten the tool enough, the threads tend to strip and will ruin your tool or crank arm, if not, both.

  3. Using the crank arm for support, tighten the bottom section of the crank puller with the crescent wrench. If your crank puller has a built-in handle, you will turn the handle on the tool clockwise. This tightens the crank puller against the crank. As you turn the handle, it pushes the arm free from the shaft.
  4. Separate the crank arm and pedal assembly from the bike.
  5. Remove the outer wave washer and set it aside.
  6. Remove the linkage arm. Lower the left upright arm counter-clockwise and the right end clockwise. You want the left upright arm resting on the ground and the linkage arm hanging straight down.
  7. Remove the inner wave washer from the bell crank spindle.
    Note: Bikes may or may not have plastic washers. If present, remove the plastic washers.
  8. Remove the bell crank bolt. You will need the 8mm hex wrench. To loosen the bolt, turn the wrench to the left (counterclockwise).
  9. After removing the bolt, you will install the crank puller in its place.
  10. Remove the bell crank with the crank puller. Do this following the same steps taken to remove the pedal crank.
  11. Install the new bell crank. It must be in the opposite position from the other side.
  12. Re-install the bell crank bolt. Apply threadlocker to the bolt and tighten it to secure the bell crank onto the shaft.
  13. Re-install the inner washer(s) previously removed from the bell crank spindle.
  14. Re-install the linkage arm. Lift the upright arm from resting on the ground while placing the linkage arm back into place on the bell crank.
  15. Re-install the outer washer removed earlier.
  16. Re-install the crank arm and pedal assembly. Apply threadlocker to the crank arm bolt and tighten it to secure the crank arm onto the shaft.
  17. Check bike operation.

This completes how to replace a left bell crank on an Assault AirBike.

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