User manual BENDIX TRAILER SYSTEM GUARD AIR DRYER

[. . . ] If moisture is present the tractor and trailer should be checked for leaks. If leakage is not excessive check the tractor air dryer for proper operation. If defective, the tractor dryer should be repaired, rechecking trailer reservoirs again after 3 months. If the tractor dryer operates satisfactorily and the trailer has not been connected to a tractor without an air dryer and the trailer glad hands were not open to the atmosphere for some extended period of time, the trailer dryer should be replaced. [. . . ] 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. 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. For vehicles with Antilock Traction Control (ATC), the ATC function must be disabled (ATC indicator lamp should be ON) prior to performing any vehicle maintenance where one or more wheels on a drive axle are lifted off the ground and moving. 2 Note: The Trailer System-GuardTM air dryer is intended to remove moisture and other contaminants normally found in the air brake system. Using alcohol, anti-freeze, oil or other de-icing substances in the brake system can damage the air dryer and will therefore void the Trailer System-GuardTM air dryer warranty. OPERATION & LEAKAGE TESTS Build the air system to governor cutout. Using a soap solution, check all lines and fittings leading to and from the Trailer System-GuardTM air dryer for leakage and integrity. Repair any excessive leaks - exceeding a 1" bubble in 5 seconds-before restoring vehicle to service. OPERATION: GENERAL The trailer dryer works as a buffer, removing moisture during exposure to wet air (trailer hooked to a tractor without an air dryer, or trailer is parked for extended periods with open glad hands) and giving up water vapor when reconnected to a tractor equipped with an air dryer. The Trailer SystemGuardTM air dryer depends on dry tractor air to remove water vapor from the desiccant collected during wet times. TRAILER SYSTEM-GUARDTM AIR DRYER REMOVAL This removal process is presented for the replacement of the Trailer System-GuardTM air dryer. Identify and disconnect the four air hoses from the Trailer System-GuardTM air dryer. Remove the locknuts, washers and grommets that secure the Trailer System-GuardTM air dryer and remove it from the vehicle. REPLACING OR RETROFITTING THE TRAILER SYSTEM-GUARDTM AIR DRYER: GENERAL The following instructions are presented for reference purposes only, since Bendix aftermarket replacement Trailer System-GuardTM air dryers are packaged with the most upto-date installation instructions. The instructions packaged with the Trailer System-GuardTM air dryers should be followed in lieu of those presented here. MOUNTING THE TRAILER SYSTEM-GUARDTM AIR DRYER 1. After positioning the Trailer System-GuardTM air dryer according to the location requirements, mark the position of the predrilled mounting holes on the selected location. A template for the mounting pattern is included on page 4. Note: Only three of the four mounting holes must be used for securing the air dryer to the frame rail. Securing the air dryer at all four mounting holes can lead to damage and eventual failure of the air dryer. Any three of the four mounting holes can be used for installation. Selection is at the discretion of the installer. [. . . ] Tighten the locknuts using a 9/16" wrench turn until the locknut, washer and outside grommet just make contact (no actual compression of the rubber grommet) then turn two(2) more turns. CONNECTING THE AIR HOSES Follow Figure 4 for air hose arrangement. The Trailer System-GuardTM air dryer supply and control line fittings are 1/4"-18 NPT. Cut the supply and control lines and install 1/4 inch fittings. 4 Template for mounting holes 2. 0 inches "12 IN SUP" Trailer System-GuardTM Air Dryer "22 OUT SUP" "11 IN CONT" Spring Brake "21 OUT CONT" R-12TM Relay Valve Supply Spring Brake Valve Reservoir If the trailer is equipped with an R-12PTM valve, the trailer systems guard must be mounted upstream of the R-12PTM valve. FIGURE 4 -TRAILER SYSTEM-GUARDTM AIR DRYER PLACEMENT 2. Connect the supply and control lines to the Trailer System-GuardTM air dryer making sure to keep the control and supply circuits separate as shown. [. . . ]