User manual BENDIX R-7 MODULATING VALVE

[. . . ] SECONDARY SERVICE CIRCUIT CONTROL PORT EXHAUST PORT #2 RES. CONTROL PISTON DUAL BRAKE VALVE PRIMARY SERVICE CIRCUIT BALANCE PORT DOUBLE CHECK VALVE SECONDARY SERVICE CIRCUIT EXHAUST CONTROL PORT PORT #2 RES. CONTROL PISTON DUAL BRAKE VALVE PRIMARY SERVICE CIRCUIT BALANCE PORT DOUBLE CHECK VALVE #1 RES. SPRING BRAKE ACTUATOR INLET/EXHAUST VALVE PRIMARY SECONDARY PARK - SUPPLY PORT SINGLE CHECK VALVE BALANCE PISTON + SPRING BRAKE HOLD-OFF PRESSURE - SERVICE AIR PRESSURE o ATMOSPHERE PRESSURE PRIMARY SECONDARY PARK - PARK CONTROL VALVE SPRING BRAKE ACTUATOR INLET/EXHAUST VALVE SINGLE CHECK VALVE BALANCE PISTON SUPPLY PORT PARK CONTROL VALVE + SPRING BRAKE HOLD-OFF PRESSURE - SERVICE AIR PRESSURE o ATMOSPHERE PRESSURE FIGURE 3 - CHARGING FIGURE 5 - SERVICE APPLICATION LOSS OF PRIMARY CIRCUIT OPERATION - SERVICE APPLICATION WITH LOSS OF AIR IN PRIMARY CIRCUIT (FIGURE 5) #1 RES. SECONDARY SERVICE CIRCUIT CONTROL PORT EXHAUST PORT CONTROL PISTON #2 RES. [. . . ] Use only genuine Bendix® replacement parts, components and kits. Replacement hardware, tubing, hose, fittings, etc. must be of equivalent size, type and strength as original equipment and be designed specifically for such applications and systems. Components with stripped threads or damaged parts should be replaced rather than repaired. Do not attempt repairs requiring machining or welding unless specifically stated and approved by the vehicle and component manufacturer. Prior to returning the vehicle to service, make certain all components and systems are restored to their proper operating condition. 3 #1 RES. SECONDARY SERVICE CIRCUIT EXHAUST CONTROL PORT PORT CONTROL PISTON #2 RES. DUAL BRAKE VALVE PRIMARY SERVICE CIRCUIT BALANCE PORT DOUBLE CHECK VALVE SPRING BRAKE ACTUATOR INLET/EXHAUST VALVE PRIMARY SECONDARY PARK - SUPPLY PORT SINGLE CHECK VALVE PARK CONTROL VALVE BALANCE PISTON + SPRING BRAKE HOLD-OFF PRESSURE - SERVICE AIR PRESSURE o ATMOSPHERE PRESSURE FIGURE 7 - PARKING 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 R-7TM valve should be inspected every 6 months or 1500 operating hours, whichever comes first, for proper operation. Should the R-7TM valve not meet the elements of the operational tests noted in this document, further investigation and service of the valve may be required. OPERATING TEST Block vehicle and hold by means other than vehicle brakes. Charge air brake system to governor cut-out pressure. Place parking control valve in "park" position. Observe that spring brake actuators apply promptly. Remove one line from delivery port of valve and install test gauge known to be accurate. Place parking control valve in "release" position. Observe that spring brake actuators release fully. With parking control valve in "release" position, note gauge pressure reading. (Check vehicle manual for correct spring brake actuator hold-off pressure. ) If pressure reading is incorrect, modulating valve should be adjusted. (See section "Adjustment of Modulating Valve - Spring Brake Actuator Hold-Off Pressure". ) 3. [. . . ] (Do not disturb center cap screw unless spring brake hold-off pressure is to be adjusted. See section "Adjustment of Modulating Valve"). Install valve retainer, spring, and washer. Install o-ring retainer, compress retainer and install retaining ring, making certain retaining ring is engaged in groove of valve body. [. . . ]