SD-08-2417 ® Bendix® AD-IS® EverFlow® Assembly EVERFLOW MODULE GOVERNOR BENDIX EVERFLOW® ELECTRONIC MODULE PURGE RESERVOIR BENDIX® AD-IS® EVERFLOW® ASSEMBLY BENDIX® AD-IS® AIR DRYER RES GOVERNOR RESERVOIR (2) PURAGUARD® MEDALLION PURGE VALVE MOUNTING HOLES - 4 DESICCANT CARTRIDGE PRESSURE PROTECTION VALVES (4) GOVERNOR SAFETY VALVE PURGE RESERVOIR MOUNTING BOLTS (3) UNL GOVERNOR UNLOADER (2) 22 SEC DELIVERY TO SECONDARY RESERVOIR 21 PRI DELIVERY TO PRIMARY RESERVOIR EXH GOVERNOR EXHAUST AD
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 guidelines should be observed AT ALL TIMES: ▲ Park the vehicle on a level surface, apply the parking brakes and always block the wheels. Always wear personal protection equipment. ▲ Stop the engine and remove the ignition key when working under or around the vehicle.
Bendix® EverFlow® Electronic Module Governor GOV CON RES 3/8" CON Schrader Valve From Engine SEC RES Supply IN CON CON CON Primary Reservoir 1/2" PRI 1/2" CON OUT Bendix® AD-IS® Air Dryer Accessories Compressor Bendix® AD-IS® EverFlow® Assembly IN 1/4" Dryer OUT CON EverFlow® IN Secondary Reservoir AD-IS Air Dryer Check Valve CON Supply IN Pressure Protection Valve Manual Valve Bulk Offload CTI CTI System Bulk Tanker Compressor OUT Discharge Line Unloader Valve Note: The Bendi
Note 1: DESICCANT BED The Bendix AD-IS® air dryer and reservoir system purge piston has a purge control channel drain. This allows any condensation in this area to flow past a diaphragm in the top of the purge piston and out through a channel in the middle of the central bolt of the purge assembly to be drained. During the purge cycle this drain is closed.
DESICCANT BED OIL COALESCING FILTER (BENDIX® AD-IS® PURAGUARD® OIL COALESCING AIR DRYER) PURGE CONTROL CHANNEL PURGE ORIFICE DELIVERY CHECK VALVE (CLOSED) PURGE RESERVOIR PRESSURE PROTECTION VALVES GOVERNOR UNLOADER PORT SUPPLY PORT A PURGE VALVE (OPEN) TURBO CUT-OFF VALVE ENGINE (CLOSED) TURBO COMPRESSOR SAFETY VALVE B C D PRIMARY PORT (PRI) PURGE RESERVOIR DRAIN VALVE SECONDARY PORT (SEC) EXHAUST PRIMARY RESERVOIR SECONDARY RESERVOIR AUXILIARY PORTS (TO ACCESSORIES) DIAGRAM SHOWS ALL
volume is high, the electronic module switches the dryers every 30 seconds until the air volume demand returns to normal. The air dryer purge piston moves down in response to a pneumatic signal from the Bendix® AD-IS® EverFlow® electronic module, causing the purge valve to open to the atmosphere and the turbo cut-off valve to close off the supply of air from the compressor (this will be further discussed in the Turbo Cut-off Feature section).
More frequent intervals may be required depending on a vehicle’s age, its compressor condition, use of a non-Bendix compressor, the operating environment, the vehicle’s vocation, and its usage. In conjunction with these guidelines, fleets can determine the functionality of their filters by checking for moisture in the air brake system monthly. If moisture is present, the air dryer cartridge may require replacement. Reference the Bendix Service Data Sheet of the specific air dryer for additional information.
B. Thermostat and Heater Operation (Refer to Figure 5). Note: These tests can only be conducted during cold weather operation. Turn off the ignition switch and cool the thermostat and heater assembly to below 40°F. Using an ohmmeter, check the resistance between the electrical pins in the air dryer connector half. The resistance should be 1.5 to 3.0 ohms for the 12 volt heater assembly and 6.0 to 9.0 ohms for the 24 volt heater assembly.
TESTING THE BENDIX® AD-IS® EVERFLOW® ASSEMBLY Before placing the vehicle in service, perform the following tests. 1. Close all reservoir drain valves. 2. Build up system pressure to governor cut-out and note that one Bendix® AD-IS® air dryer purges with an audible burst of air, followed immediately by approximately 30 seconds of air flowing out of the purge valve. 3. Apply and release the service brakes several times to reduce system air pressure to governor cut-in.
DELIVERY CHECK VALVE CLEANING PROCEDURE CLEANING & INSPECTION (Note: This is only required if system pressure does not build after temporary bypass is completed.) Consult the service data sheet for the dryer used in your AD-IS® EverFlow® assembly. The service data sheet contains information useful for maintenance and service of the air dryers. Refer to Figure 6 throughout this procedure. Depressurize the air brake system following the General Safety Guidelines outlined on page 2 in this document.
ASSEMBLY TESTING THE EVERFLOW® ASSEMBLY AIR DRYERS 1. Lubricate the smaller o-ring and check valve body with a heavy-duty lithium grease. Before placing the vehicle in service, perform the following tests: 2. Install this o-ring on the check valve body by sliding the o-ring over the set of four tapered guide lands. The o-ring groove holds the o-ring in its correct location. 1. Close all reservoir drain valves. 3.
• Excessive pressure (above 175 PSIG) in the compressor discharge line. Look for obstruction downstream of the Bendix® AD-IS® EverFlow® assembly such as a pinched line or restrictive valve or fitting. 2. Air dryers do not purge. • Insufficient air pressure in the secondary reservoir. The Bendix® EverFlow® electronic module will not operate until air pressure in the secondary tank reaches 80 PSIG. • The check valve in the EverFlow assembly supply line from the secondary tank is installed incorrectly.
