User manual BENDIX AD-SP SYSTEM PURGE AIR DRYER

[. . . ] ® Bendix® AD-SPTM System Purge Air Dryer & SC-PRTM Single Check Protection Valve "SPIN OFF" DESICCANT CARTRIDGE MOUNTING HOLES (3) MOUNTING HOLES (3) CONTROL PORT HEATER & THERMOSTAT CONNECTOR TURBO CUTOFF VALVE EXHAUST PORT FIGURE 1 - AD-SPTM SYSTEM PURGE AIR DRYER SUPPLY PORT EXHAUST PORT DELIVERY PORT DESCRIPTION The function of the AD-SPTM System Purge Air Dryer is to collect and remove air system contaminants in solid, liquid and vapor form before they enter the brake system. It provides clean, dry air to the components of the brake system which increases the life of the system and reduces maintenance costs. Daily manual draining of the reservoirs is eliminated. The system purge designation is used because the AD-SPTM air dryer uses a small portion of system air pressure from the supply and front axle service reservoirs to perform the purge or regenerative function. [. . . ] When the AD-SPTM air dryer is used in this installation, the Holset ECON valve should be removed and the special orifice check valve in the "make-up" line should be removed and replaced with a conventional single check valve. This is most easily done using a special 45 deg. supply port fitting, 112864, and single check valve 109710. Use the following guidelines to determine the vehicle application suitable for the AD-SPTM air dryer: Total Vehicle Res. In. ) Less than 9, 000 . . . . . . . . . . . . . . . . . . . . . . . . . . . AD-SPTM Air Dryer Less than 9, 000 w/several . . . . . . . . . . . AD-9TM Extended Purge air accessories or high air Volume Air Dryer usage (e. g. transit coaches & refuse haulers) Greater than 9, 000 . . . . . . . . . . . . . . . . . . . . . . . AD-9TM Extended Purge Volume Air Dryer or Contact Bendix Commercial Vehicle Systems LLC 12 VEHICLE PREPARATION 1. Park the vehicle on a level surface and prevent movement by means other than the brakes. Locate the front axle service (secondary) reservoir in preparation for installing the SC-PRTM single check protection valve included with AD-SPTM air dryer retro-fit kits. With full system pressure in all reservoirs, drain any single reservoir and observe the reaction of the dash gauges. If the supply reservoir was drained, no reaction will be noted on the dash gauges. When the front axle service reservoir gauge displays a pressure loss mark the reservoir that was drained. Confirm that the front axle service (secondary) reservoir has been found by building system pressure to governor cut-out and draining the marked reservoir. After the reservoir is completely drained make a service brake application and have an assistant observe the front axle service brakes. The front axle brakes should be inoperative. Some vehicles may be equipped with multicompartment reservoirs. This type of reservoir is easily identified by the presence of more than one drain cock in the reservoir shell. The most common is a two compartment reservoir with a "built-in" single check valve between the two compartments. In most instances when this type of reservoir is in use, one of the two compartments (usually the smallest) will be the supply reservoir and the second compartment will be either the front or rear service reservoir. Drain air from either of the two compartments and observe the dash gauges. [. . . ] Clean and inspect the purge valve before re-installation, or replace with a new purge valve. 23 Appendix A Table A: Maintenance Schedule and Usage Guidelines Regularly scheduled maintenance is the single most important factor in maintaining the air brake charging system. Column 1 Typical Compressors No. of Spec'd Axles Column 2 Discharge Line I. D. Length Column 3 Recommended Air Dryer Cartridge Replacement 1 Column 4 Recommended Reservoir Drain Schedule2 Column 5 Acceptable Reservoir Oil Contents3 at Regular Drain Interval Vehicle Used for: Low Air Use Compressor with less than 15% duty cycle 1/2 in. Bendix® Tu-Flo® 550 air compressor 6 ft. Recommended Every Month Max of every 90 days e. g. [. . . ]