User manual BENDIX PP-1-2-5-8-RD-3 PUSH-PULL VALVES

[. . . ] The PP-8TM valve also has a larger diameter shaft for button mounting so that when installed on the same panel with other PP valves the buttons cannot be inadvertently mixed. The PP-8TM valve is normally used to operate tractor spring brakes independently from the trailer. The PP-5TM valve is unique in having an auxiliary piston in the lower cover which, upon receiving a pneumatic signal of 18 psi or more, will cause the valve to move from the applied to the exhaust position from a 100 psi application. [. . . ] (This does not apply to the RD-3TM, PP-8TM or some PP-1TM valve's). REMOVAL Block and/or hold the vehicle by a means other than air brakes and drain all reservoirs. Mark each air supply line and its port for easy reinstallation, then disconnect them. Remove the valve from the panel by removing the panel mounting nut. INSTALLING 1. Secure the operating button by installing the button roll pin. PP-5TM VALVE 1. With the button pushed in (applied position) with 125 psi supply pressure and a gradually increasing pressure applied at the pilot air port the valve should move to the release position with a pilot pressure of not more than 18 psi. Leakage in this mode should not exceed a 1" bubble in 3 seconds at the exhaust port and a 1" bubble in 5 seconds at the plunger stem. DISASSEMBLY: PP-1TM, PP-8TM AND RD-3TM VALVES 1. Remove the two cap screws (3) which retain the lower cover and remove cover. Insert a small punch through the roll pin hole in the stem and remove the lock nut (5). Remove inlet-exhaust valve (6) and plunger (7) and spring (8) (if any). With the button pulled out (exhaust position), leakage at the brake valve port or at the plunger stem should not exceed a 1" bubble in 5 seconds. Leakage at the exhaust port or around the plunger stem should not exceed a 1" bubble in 5 seconds. Pull the button out and apply supply pressure at the brake valve port. Supply pressure should be present in the delivery volume and leakage at the exhaust port should not exceed a 1" bubble in 5 seconds. Note: If any of the above push-pull valves do not function as described or if leakage is excessive, it is recommended they be returned to our nearest authorized distributor for a factory rebuilt or new valve. DISASSEMBLY: PP-5 VALVE 1. Remove piston (11) Figure 4 and o-ring (2). TM DISASSEMBLY: PP-2TM VALVE 1. Insert a small punch through the roll pin hole in the plunger and remove the lock nut (1) from the plunger. Remove the two machine screws (2) and remove the lower cover (3). 2 PANEL MOUNTING NUT BUTTON ROLL PIN 9 8 7 PANEL MOUNTING NUT BUTTON ROLL PIN 9 8 4 6 4 BRAKE VALVE PORT 5 7 2 3 6 5 3 PP-1TM VALVE FIGURE 2 FIGURE 3 1 PP-2TM VALVE PANEL MOUNTING NUT 9 7 8 9 7 6 10 5 4 6 4 3 11 3 5 FIGURE 4 PP-5TM VALVE 2 FIGURE 5 PP-8TM VALVE 3 GENERAL SAFETY GUIDELINES 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. 1. [. . . ] 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. [. . . ]