User manual BENDIX E-12-E-15 BRAKE VALVE

[. . . ] ® Bendix® E-12TM & E-15TM Dual Brake Valve TREADLE UPPER BODY ASSEMBLY PRIMARY DELIVERY ( DEL-1 ) 21 SECONDARY DELIVERY ( DEL-2 ) 22 LOWER BODY ASSEMBLY EXHAUST MOUNTING PLATE PRIMARY SUPPLY ( SUP-1 ) 11 PRIMARY SUPPLY ( SUP-2 ) 12 PRIMARY DELIVERY ( DEL-1 ) 21 SECONDARY DELIVERY ( DEL-2 ) 22 FIGURE 1 - E-12TM AND E-15TM DUAL BRAKE VALVES DESCRIPTION The E-12TM and E-15TM dual brake valves are floor mounted, treadle operated type brake valves with two separate supply and delivery circuits for service and secondary braking. The separation of circuits provides the driver with a graduated control for applying and releasing the vehicle brakes. The E-12TM and E-15TM brake valves are similar in design with the exception of the rubber spring (9) and spring retainer (7) located in the upper body. The rubber spring which is used in the E-12TM brake valve alters the performance of the valve such that the primary circuit delivers full reservoir pressure to the spring brakes with less treadle travel than that of the E-15TM brake valve. [. . . ] 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. VEHICLE PREPARATION 1. Park the vehicle on a level surface and block the wheels and/or hold the vehicle by means other than the air brakes. Drain the air pressure from all vehicle reservoirs. WARNING!PLEASE READ AND FOLLOW THESE INSTRUCTIONS TO AVOID PERSONAL INJURY OR DEATH: When working on or around a vehicle, the following general precautions should be observed at all times. Remove the valve assembly return spring (14). Carefully remove and discard the exhaust diaphragm retainer (24) and exhaust diaphragm (25) from the lower body. Note: Some E-12TM & E-15TM brake valves have threaded exhaust ports in lieu items 24 & 25. Using finger force, push the piston (2) into the body until the piston retaining ring (1) is fully visible. Remove the piston retaining ring (1), taking care not to damage the piston bore in the body. Gently tap the body on a soft surface to remove the piston (2). Remove and discard the o-rings (3 & 5) and both wear rings (4) from the piston (2). Place the piston on a flat surface and using finger force, depress and hold the spring retainer (7), then remove and discard the retaining ring (6) from the piston (2). Gently release the spring retainer (7), allowing it to rise out of the piston. Remove the spring retainer (7) and graduating spring (8) from the piston (2). 12. Remove and discard the rubber spring (9) from the interior of the piston (2). Note: The rubber spring (9) is installed in the E-12TM brake valve only. Remove and discard the special beveled retaining ring (10) from the piston (2) while manually holding and compressing the valve seat (11) in place. Slowly release the valve seat (11), allowing it to rise out of the piston (2). Remove the valve seat (11), then remove and discard the o-ring (12). Remove and discard the valve assembly (13) along with its o-ring (15) from the piston (2). [. . . ] Make certain the o-rings (3 & 5) and wear rings (4) are not damaged in the process. If substantial resistance is encountered, check for proper installation of the wear rings. Install the piston retaining ring (1) in its groove in the upper body, making certain it is fully seated in the groove. Install the plunger (21) in its return spring (22). [. . . ]