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7. Torque down the brake pad bracket screws. See Table 7: Fastener Standard Torque Values in
section 6.3 for tightening torque.
8. Reinstall any removed conveying rollers.
6.8.4
Actuator Replacement (Brake)
1. Remove conveying rollers (1) until the entire brake 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.
2. Remove the two socket head cap screws (32) holding the brake shoe in place. Set the brake
shoe aside. See Detail A of Figure 26: General Arrangement, RZPAC Bed Section, Sheet 2 of 2
in Appendix 2: General Arrangement Drawings.
3. Reach under the brake guide plate with a narrow wrench and hold the nose of the cylinder (3)
from spinning. If needed, the brake guide plate can be manually pulled up against the return
spring to provide more space.
4. Loosen the button head cap screw (33) and remove the brake 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.
5. Unhook the air tube connected to the actuator (3).
6. Remove the four socket head cap screws (32) holding the actuator (3) in place.
7. Install a new actuator (3), ensuring that the air inlet is facing the same direction as the old
actuator. Use new patch screws (32) or use blue Loctite 243 on the actuator fasteners.
8. Hook the air tube to the new actuator. If the end of the tube is damaged, cut a small portion off to
create a new, square end.
9. Inspect the hardware that connects the actuator to the brake 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 brake 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 brake guide plate moves freely in the cylinder bushings (6) and that all hardware is
assembled in the correct order.
12. Reinstall the brake shoe.
13. Reinstall any removed conveying rollers.
6.8.5
Guide Bushing Replacement (Brake)
1. Remove conveying rollers (1) until the entire brake is accessible. See Detail A of Figure 26:
General Arrangement, RZPAC Bed Section, Sheet 2 of 2 in Appendix 2: General Arrangement
Drawings.
2. Remove the two socket head cap screws (32) holding the brake shoe in place. Set the brake
shoe aside.
3. Reach under the brake guide plate with a narrow wrench and hold the nose of the cylinder (3)
from spinning. If needed, the brake guide plate can be manually pulled up against the return
spring to provide more space.
4. Loosen the button head cap screw (33) and remove the brake guide plate.
Published November 2021
Installation and Maintenance Manual: RZPAC
Rev. B
57
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