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

[. . . ] Experience is a valuable guide in determining the best maintenance interval for air brake system components. At a minimum, the PP valves should be inspected every 6 months or 1500 operating hours, whichever comes first, for proper operation. Should the PP valves not meet the elements of the operational tests noted in this document, further investigation and service of the valve may be required. 1 SD-03-3611 AUTOMATIC EXHAUST MOMENTARY APPLY PILOT TRIP FEATURE NONAUTOMATIC 4. Remove the inlet-exhaust valve (4), and piston (5). [. . . ] Reconnect the air lines using marks made during removal as a guide. Secure the operating button by installing the button roll pin. PP-5TM VALVE 1. Proceed as for PP-1TM valve through Step 3. Connect a modulated source of air pressure to the pilot air inlet. 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). Remove o-ring (9) from plunger. PP-2TM VALVE 1. Proceed as for PP-1TM valve through Step 1. 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. Supply pressure should be present in the delivery volume. 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. Perform same operations as for PP-1TM valve. Remove inlet seal (10) in Figure 4 from lower cover. Remove the ring diaphragm (4) from the inlet seat. 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. [. . . ] Never connect or disconnect a hose or line containing pressure; it may whip. Never remove a component or plug unless you are certain all system pressure has been depleted. 6 4 PANEL MOUNTING NUT BUTTON ROLL PIN 9 7 8 5 3 RD-3TM VALVE FIGURE 6 8. Use only genuine Bendix ® replacement parts, components and kits. Replacement hardware, tubing, hose, fittings, etc. [. . . ]