Installation and Maintenance Manual: RLVAC
Published February 2022
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5. Loosen, but do not remove, the 1”-8 teardrop bolt. Conveying rollers may be removed to gain
access to the nut inside the drive section. See Figure 31: General Arrangement, Belt Under Roller
AC, Screw Takeup Drive, Sheet 1 of 1 in Appendix 2: General Arrangement Drawings for details.
6. Remove the shoulder bolt connecting the motor’s torque arm to the teardrop. The motor will have
a tendency to rotate around the shaft once this bolt is removed. Lift the teardrop out of the way so
it clears the motor’s torque arm.
7. Slide the motor off the drive shaft. If the motor does not slide freely, it may be binding because
the motor’s weight is not evenly supported.
Never hammer on the motor, gearbox, or shaft. Damage to the drive pulley bearings or
gearbox bearings can result.
8. Inspect the shaft and shaft key. File off any burrs, clean the shaft of any debris or corrosion, and
apply a good quality anti-seize compound to all exposed steel surfaces.
9. Orient the new motor’s key slot to match the key location in the shaft. For higher gear reductions,
this may require temporarily removing the rear cover to spin the motor fan by hand.
10. Slide the new motor onto the drive shaft. The new motor should slide freely; if it does not, find the
area that is binding and correct it. Forcing the motor in place will make it extremely difficult to
remove, and may cause damage to the drive shaft or gearbox bearings.
11. Reinstall the shoulder bolt in the new motor’s torque arm, and tighten the 1”-8 teardrop bolt to 200
ft-lbs. See Table 7: Fastener Standard Torque Values in section 6.3 for tightening torque of the
shoulder bolt.
12. Reinstall the shaft fixing hardware, ensuring that the threads are coated with anti-seize.
13. Reconnect the electrical connections, maintaining the phase rotation that was noted when
disconnecting the old motor. Review the winding diagram provided on the motor nameplate or
inside the junction box, to ensure the motor windings are set up for the correct voltage.
14. Replace any conveying rollers and guards that were removed. Briefly start up the new motor to
ensure it is running in the correct direction.
6.5.2 Drive Pulley Replacement
1. Follow steps 2 through 7 of section 6.5.1 to remove the drive motor (63).
2. 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.
3. 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.
4. Remove the underside guard on the drive section. For conveyors where access from underneath
is restricted, remove conveying rollers and one pressure module instead. See section 6.8 for
details.
5. Remove the bearings (49) on both sides of the drive pulley (44).
Do not hammer or pry on the outer races of the bearings. Damage to the bearings may
result.
6. Remove the XT25 bushings on either side of the pulley shaft. Access to the bushing bolts is
provided once the bearings are removed. Reference the PCI XT bushing installation instruction
sheet for detailed instructions.
7. Repeat step 6 for the replacement pulley, making sure to keep the replacement parts separate
from the parts which are removed from the conveyor.
8. Slide the pulley shaft out from the conveyor, making sure to support the pulley drum.
