To change the drive sprocket in a drive unit with long tensioner, please proceed as follows:
  1. Disconnect the electrical and pneumatic supply of the entire conveyor system and secure against reconnection.
  2. Remove the clear front cover of the drive station and release the chain tensioner. Lock it in that position with an adequate device.
  3. Remove the chain from the drive sprocket.
  4. Release the mounting bolts of the drive sprocket with an Allen wrench (M6) and remove the bolts with the disk.
  5. Pull the drive sprocket off the motor shaft with a suitable puller. The spacer ring has to remain on the motor shaft because it will be used as a hard stop for the new sprocket to get the right alignment.
  6. Install the new drive sprocket in reverse order. If a drive sprocket with different diameter gets used, the drive chain length has to be checked and it needs to be shortened or lengthened if required. That should be done at an existing master link. Make sure that the drive sprocket is correctly positioned: The centerline of the chain has to be in one line.
  7. Re-tension the chain and reset the chain tensioner.
  8. Install the clear front cover of the drive station.
  9. Run the conveyor system and check the tension of the chain at the chain tensioner. If the chain tensioner is almost at its far end, the chain has to be shortened by another chain link.
  10. Check the chain tension after two hours of operation again.

    Drive Unit Replacing drive sprocket long tensioner