Installation and Maintenance Manual: RLVAC
Published February 2022
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9. Push the loosened belt to one side and slide the pulley drum out of the drive module. Slide the
replacement pulley drum into the same location, without losing the loop of belting.
10. Slide the replacement pulley shaft into the conveyor to hold the drive pulley drum loosely in place.
11. Verify correct belt routing using the arrows on the side of the drive section. See Figure 24: Screw
Takeup Drive Belt Routing in section 5.5.1 for confirmation.
12. Reassemble and torque the XT bushings on the replacement pulley following the PCI XT bushing
installation instruction sheet, taking care that the pulley drum is centered between the two
sideframes.
13. Reinstall both drive pulley bearings (49). Torque the set screws per ABB Motors MN3016, only
after both bearings are fully installed and their mounting bolts are torqued.
14. Follow steps 8 through 14 of section 6.5.1 to replace the drive motor.
15. See section 5.12.1 for belt tensioning and tracking instructions.
16. Replace any guards or conveying rollers that were removed.
6.5.3 Takeup Pulley Replacement
1. Remove the side guards on both sides of the screw takeup. See Figure 31: General
Arrangement, Belt Under Roller AC, Screw Takeup Drive, Sheet 1 of 1 for details.
2. Loosen the tensioner jam nuts, then turn both tensioner screws (70) counterclockwise until all belt
tension is released. Ensure that both screws are adjusted evenly to prevent binding.
3. Continue turning both tensioner screws (70) until the tension indicator weldments (71) are
completely unthreaded on both sides.
4. Remove the tension indicator weldments (71). Leave the takeup springs (68) and guide tubes
(69) on the end of the tensioner screws. Slide the tensioner screws out of the way.
5. Remove the bearings (66) and shaft fixing hardware on both sides of the takeup pulley (67).
Do not hammer or pry on the outer races of the bearings. Damage to the bearings may
result.
6. Slide the takeup pulley towards the drive motor until it can fit through the circular cutout in the
drive frame, then remove the pulley from the drive.
7. Insert the new takeup pulley in the loop of belt that is left open from the removal of the old takeup
pulley.
8. Verify correct belt routing using the arrows on the side of the drive section. See Figure 24: Screw
Takeup Drive Belt Routing in section 5.12.1 for confirmation.
9. Install the bearings (66) and shaft fixing hardware on the new takeup pulley shaft, making sure
the pulley drum is centered between the bearings. Torque the set screws per ABB Motors
MN3016 only after both bearings are fully installed and their mounting bolts are torqued.
10. Reassemble the tensioner screws (70), takeup springs (68), guide tubes (69), and tension
indicator weldments (71).
11. See section 5.12.1 for belt tensioning and tracking instructions.
12. Replace any guards that were removed.
6.5.4 Takeup Spring or Guide Tube Replacement
1. Remove the side guards on both sides of the screw takeup. See Figure 31: General
Arrangement, Belt Under Roller AC, Screw Takeup Drive, Sheet 1 of 1 for details.
2. Loosen the tensioner jam nuts, then turn both tensioner screws (70) counterclockwise until all belt
tension is released. Ensure that both screws are adjusted evenly to prevent binding.
3. Continue turning the affected tensioner screw (70) until the tension indicator weldment (71) is
completely unthreaded.
4. Remove the tension indicator weldment (71).