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3. Unbolt and remove the tracking roller from the conveyor. Leave the tracking roller adjustment
brackets in place so as not to disturb the existing tracking settings.
4. Follow the procedures in section 5.6 for installation of the new tracking roller.
6.9.2.2
Tracking Band Replacement
1. Relax belt tension by loosening the takeup. See section 5.11.1 for screw takeup drives or section
5.11.2 for pneumatic takeup drives.
1. Remove conveying rollers to access the tracking roller. See Figure 25: General Arrangement,
RZPAC Bed Section, Sheet 1 of 2 and Figure 26: General Arrangement, RZPAC Bed Section,
Sheet 2 of 2 for details.
2. Unbolt and remove the tracking roller from the conveyor. Leave the tracking roller adjustment
brackets in place so as not to disturb the existing tracking settings.
3. Push a flat head screwdriver or similar tool under one of the three tracking bands.
4. With the screwdriver angled slightly, turn the roller to "unscrew" the tracking band down the length
of the roller and remove it.
5. Repeat for the other two bands.
6. Clean the roller surface to remove any oils that may make the bands slip. Ensure any solvent
residue has evaporated before proceeding.
7. Stretch a new band over the roller, being careful not to overstretch or damage it.
8. Using the same screwdriver technique, place the new band in the center of the roller. Adjust its
position until it is running true.
9. Repeat with the remaining two new bands. Adjust all three bands until they are touching without
overlaps.
10. Follow the procedures in section 5.6 for installation of the tracking roller.
If tracking band installation is difficult, use a liquid hairspray to lubricate the roller
surface. Once the hairspray "sets" it will help prevent the band from walking. Soapy
water may also be used but it does not provide any additional gripping power. Do not
use oils as lubricants, since these can keep the band from gripping the roller.
If tracking bands are found to walk over time, they can be fixed in place with a few
small drops of cyanoacrylate superglue underneath the band every 90°. This can
provide a quicker and easier solution than replacing the tracking band. Clean the roller
before applying the superglue.
6.9.3
Return Roller Replacement
1. Push the roller hex in and tilt the roller up. With care, the roller can be extracted and replaced
without removing belt tension or changing the roller's tracking adjustment. See Figure 25:
General Arrangement, RZPAC Bed Section, Sheet 1 of 2 and Figure 26: General Arrangement,
RZPAC Bed Section, Sheet 2 of 2 for details.
2. If the belt is too tight to remove the return roller (e.g. if the return roller needing replacement is
very near a drive or tail), then remove the 4 carriage bolts holding the yellow guard in place and
drop the roller out through the bottom of the return roller module.
3. Slide the new roller into place.
4. Reinstall the guard if needed.
5. Check belt tracking once the new roller has been installed.
6.9.4
Air Regulator Replacement and Maintenance
1. See Figure 24: Air Regulator Assembly. Reference Table 11: RZPAC General Arrangement BOM
in section 9 for part numbers and descriptions.
Published November 2021
Installation and Maintenance Manual: RZPAC
Rev. B
61
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