Atlas Copco XRYS 577 Instruction Manual page 41

Emergency release of spring-loaded parking brake
(2)
(3)
Reference Name
1 Brake cylinder
2 Protection cap
3 Threaded bolt
To release the spring-loaded parking brake when the
air pressure is less than 5.2 bar (75.4 psi) proceed as
follows. The procedure has to be executed on each
individual brake.
Place wheel chocks. Open the protection cap on the
spring. Rotate it to the side. Loosen the nut (wrench
size 24) on the threaded bolt. Remove the bolts from
the bracket.
(1)
Put the loose thread bolt with the profile at the end in
the opening of the spring brake. Turn the thread bolt
around approximately 90°. Put the washer and the nut
on the thread bolt and tighten them up to the case of
the spring brake.
- 41 -
Now using the wrench, tighten the nut and thus
compressing the spring and releasing the brake. You
must perform this operation on all spring brakes.
Deactivate the emergency release before the journey
and before you put the pressure on the handbrake
back.
Resetting the emergency release
If the brake system operating pressure reaches at least
5.2 bar (75.4 psi), you will need to unscrew the
threaded bolts in all the spring brakes and remove
them. Place the threaded bolts back on the housing of
the spring brake and then secure them properly. Close
the assembly with the protection cap. The emergency
release brake is deactivated and the compressor can
be braked with the spring-loaded brake.