Chain Tensioner Replacement Guide

The KG4 chain tensioner can be replaced if you are instructed to do so by Keego Mobility Product Support.

Follow the steps below to replace the chain tensioner

Tools Needed:

• Phillips head screwdriver
• 5 mm Allen wrench
• Nitrile gloves (optional)
• The replacement chain tensioner from Keego

Remove the Old Chain Tensioner

1. Get the ebike ready for maintenance. Turn off the ebike, remove the battery, and press and hold MODE or the power button to discharge remaining power, below is the position of chain tensioner.
2. Roll the chain off the chainring. Push the chain tensioner toward the front of the ebike to provide slack. Use a paper towel or shop towel to grab the chain, then lift and hold the chain toward the inside while turning the pedals toward the back of the bike to carefully roll the chain off the chainring.
3. Remove the lower pulley wheel. Use a Phillips head screwdriver to remove the lower pulley wheel bolt. Recycle the bolt and pulley wheel according to local rules.
4. Remove the chain tensioner mounting bolt and remove the chain tensioner. Use a 5 mm Allen wrench to remove the chain tensioner mounting bolt. Remove the chain tensioner from the derailleur hanger. Set the hardware aside; it will be used to install the new chain tensioner.

Install the New Chain Tensioner

1. Locate the new chain tensioner and hardware set aside earlier.
2. Remove the lower pulley wheel on the new chain tensioner. Use a Phillips head screwdriver to unscrew the bolt. Set the bolt and pulley wheel aside for a later step.
3. Place the chain tensioner in position on the derailleur hanger so the chain runs across the right side of the upper pulley wheel. Carefully thread the bolt through the chain tensioner mounting point and into the axle without cross-threading the bolt. Use a 5 mm Allen wrench to tighten the bolt. Torque to 6 Nm.
4. Reinstall the chain on the front chainring and ensure there is adequate chain tension. Press the chain tensioner toward the front of the bike with your left hand. Use a paper towel in your right hand to grab the chain and carefully set it fully onto the teeth of the chainring. Rotate the crank toward the front of the bike to install the chain.
5. Rotate the pedals toward the back of the bike to ensure the chain is properly routed on the front chainring and chain tensioner.
6. Reinstall the battery and test the ebike fully before riding.