User manual BENDIX R-8 RELAY VALVE

[. . . ] A single 1/4" service port is located in the cover which can be rotated to 90° increments. The R-8TM valve incorporates a unique, quick release and anti-compounding feature located above the service port in the cover. With the anti-compounding feature not in use, an exhaust cover is installed. When the anti-compounding feature is used, removal of the exhaust cover exposes a 1/8" pipe thread balance port. [. . . ] If a service brake application is made, air from the service brake valve enters the exhaust port of the quick release on the R-8TM valve and moves the diaphragm, blocking the service port. Air then proceeds into the cavity above the relay piston, forces the piston down, closing the exhaust and opening the inlet to deliver air to the spring brake cavity as described under the section of this manual entitled APPLYING. PREVENTIVE MAINTENANCE Important: Review the Bendix Warranty Policy before performing any intrusive maintenance procedures. A warranty may be voided if intrusive maintenance is performed during the warranty period. No two vehicles operate under identical conditions, as a result, maintenance intervals may vary. Experience is a valuable guide in determining the best maintenance interval for air brake system components. At a minimum, the valve should be inspected every 6 months or 1500 operating hours, whichever comes first, for proper operation. Should the valve not meet the elements of the operational tests noted in this document, further investigation and service of the valve may be required. 2 (NOTE: The standard R-8TM valve does not employ a piston return spring. However, it is optionally used in some values. ) 3. Remove the sealing ring from the groove in the body. Remove the relay piston and o-ring from the cover. Remove the service port cap nut from the cover and remove the cap nut o-ring from the cap nut. Remove the quick release diaphragm from the service port. If the exhaust port of the quick release is protected with a cover, remove the cover by removal of the #10-24 phillips screw. Remove the #10-24 phillips screw that secure the exhaust diaphragm and washer to the exhaust cover. Remove the four #10-24 phillips head screws that secure the exhaust cover to the body. Remove the inlet/exhaust valve insert from the body. (NOTE: If a new inlet/exhaust value insert is to be installed, omit step 11. ) 11. Disassemble the insert by removing the retaining ring and separating; the special washer, o-ring retainer and o-rings, the valve spring, valve retainer and the inlet and exhaust valve. Wash all metal parts in mineral spirits and dry them thoroughly. (NOTE: When rebuilding the R-8TM valve, all springs and all rubber parts should be replaced. ) 2. Inspect all metal parts for deterioration and wear, as evidenced by scratches, scoring and corrosion. [. . . ] Secure the body to the cover using the four 5/16-18 hex head cap screws. Torque to approximately 80-120 inch pounds. INSTALLING Prior to installing the R-8TM valve on the vehicle, all connecting air lines should be inspected for kinks, cuts, chafing and deterioration. Connect all air lines to the proper ports, using the identification markings of the lines made before valve was removed. [. . . ]