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12. Reassemble the module guide plate and hardware, paying particular attention that none of the
washers (8), (9) are pinched in between the spacer (10) and the cylinder nose. Use red Loctite
263 on the button head cap screw.
13. Ensure the module guide plate moves freely in the cylinder bushings (6) and that all hardware is
assembled in the correct order.
14. Reinstall the pressure module in the same orientation it was removed. Install all four screws (32)
loosely first, then torque the two screws that are in round holes, then finally torque the two screws
that are in slots.
15. Reinstall any removed pressure module rollers, finger guards, and conveying rollers.
16. Follow the belt tensioning and tracking procedures in section 5.11.1 for screw takeup drives, or
section 5.11.2 for pneumatic takeup drives. Check belt tracking in the area of the removed
module. If the module was replaced in the same orientation, no adjustment should be necessary.
6.8.7
Guide Bushing Replacement (Pressure Module)
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.
2. Remove conveying rollers (1) until the entire pressure module is accessible. 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.
3. For 3"RC conveyor, remove the finger guard (20). For 2" RC conveyor, remove the two pressure
module rollers (2) at either end of the module.
4. Remove the four socket head cap screws (32) holding the pressure module in place. Set the
pressure module aside, noting its flow direction for later.
5. Reach under the module guide plate with a narrow wrench and hold the nose of the cylinder (3)
from spinning. If needed, the module guide plate can be manually pulled up against the return
spring to provide more space. See Detail B of Figure 26: General Arrangement, RZPAC Bed
Section, Sheet 2 of 2 in Appendix 2: General Arrangement Drawings.
6. Loosen the button head cap screw (33) and remove the module guide plate.
The button head cap screw in the cylinder nose is held in place with high-strength
threadlocker. It may be necessary to heat up the fastener with a heat gun in order to
loosen the threadlocker.
7. Pry off the retaining ring (7) holding the bushing (6) in place. Discard the old bushings and
retaining rings.
8. Put a new bushing in place and press on a new retaining ring (7) until the bushing no longer
moves vertically. The fingers of the retaining ring should face downward.
9. Inspect the hardware that connects the actuator to the module guide plate (8), (9), (10), (33).
Replace any hardware, particularly the nylon washers (9), that is worn or damaged. If the button
head cap screw (33) has a damaged or stripped hex socket, replace it. Otherwise, thoroughly
clean any threadlocker residue off the screw threads.
10. Reassemble the module guide plate and hardware, paying particular attention that none of the
washers (8), (9) are pinched in between the spacer (10) and the cylinder nose. Use red Loctite
263 on the button head cap screw.
11. Ensure the module guide plate moves freely in the cylinder bushings (6) and that all hardware is
assembled in the correct order.
12. Reinstall the pressure module in the same orientation it was removed. Install all four screws (32)
loosely first, then torque the two screws that are in round holes, then finally torque the two screws
that are in slots.
13. Reinstall any removed pressure module rollers, finger guards, and conveying rollers.
Published November 2021
Installation and Maintenance Manual: RZPAC
Rev. B
59
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