User manual BENDIX BA-922 COMPRESSOR

[. . . ] BENDIX® BA-922® COMPRESSOR DESCRIPTION The function of the air compressor is to provide and maintain air under pressure to operate devices in the air brake systems. The Bendix® BA-922® compressor is a two cylinder reciprocating compressor with a rated displacement of 31. 6 cubic feet per minute at 1250 RPM. The compressor consists of a water cooled cylinder head, cooling plate, valve plate assembly and an integral air cooled crankcase and cylinder block. The cast aluminum cylinder head contains the required air and water ports as well as two unloader pistons. [. . . ] Shorter discharge line lengths or insulation may be required in cold climates. The air dryer contains a filter that collects oil droplets, and a desiccant bed that removes almost all of the remaining water vapor. The compressed air is then passed to the air brake service (supply) reservoir. The oil droplets and the water collected are automatically purged when the governor reaches its "cut-out" setting. For vehicles with accessories that are sensitive to small amounts of oil, we recommended installation of a Bendix® PuraGuard® system filter, designed to minimize the amount of oil present. Discharge Line Optional "Ping" Tank Air Dryer The Air Brake Charging System supplies the compressed air for the braking system as well as other air accessories for the vehicle. The system usually consists of an air compressor, governor, discharge line, air dryer, and service reservoir. Optional Bendix® PuraGuard® System Filter or PuraGuard QCTM Oil Coalescing Filter Compressor (Governor plus Synchro valve for the Bendix® DuraFloTM 596 Compressor) Governor Service Reservoir (Supply Reservoir) Reservoir Drain 12 Regularly scheduled maintenance is the single most important factor in maintaining the air brake charging Column 1 Typical Compressors Spec'd (See footnote 7) Table A: Maintenance Schedule and Usage Guidelines Column 2 Discharge Line I. D. Length Column 3 Recommended Air Dryer Cartridge Replacement1 Column 4 Recommended Reservoir Drain Schedule2 Vehicle Used for: Low Air Use Compressor with less than 15% duty cycle No. of Axles Column 5 Acceptable Reservoir Oil Contents3 at Regular Drain Interval 1/2 in. Bendix® Tu-Flo® 550 air compressor 6 ft. Line haul single trailer w/o air suspension, air over hydraulic brakes. Compressor with up to 25% duty cycle 5 or less For oil carry-over control4 suggested upgrades: 5/8 in. Double/triple trailer, open highway coach/RV, (most) pick-up & delivery, yard or terminal jockey, off-highway, construction, loggers, concrete mixer, dump truck, fire truck. Bendix® BA-921® air compressor 5 or less For oil carry-over control4 suggested upgrades: BASIC test acceptable range: 3 oil units per month. See appendix A. 5/8 in. 12 ft. Bendix® Tu-Flo® 750 air compressor Compressor with up to 25% duty cycle For the BASIC Test Kit: Order Bendix P/N 5013711 1/2 in. 12 ft. See appendix A. Bendix® BA-922®, or DuraFloTM 596 air compressor 8 or less For oil carry-over control4 suggested upgrades: 5/8 in. 15 ft. Compressor with up to 25% duty cycle Every Month 3/4 in. City transit bus, refuse, bulk unloaders, low boys, urban region coach, central tire inflation. 12 or less Footnotes: 1. With increased air demand the air dryer cartridge needs to be replaced more often. Allow the oil/water mixture to fully settle before measuring oil quantity. To counter above normal temperatures at the air dryer inlet, (and resultant oil-vapor passing upstream in the air system) replace the discharge line with one of a larger diameter and/or longer length. If sufficient cooling occurs, the oil-vapor condenses and can be removed by the air dryer. Note: To help prevent discharge line freeze-ups, shorter discharge line lengths or insulation may be required in cold climates. (See Bendix Bulletins TCH-08-21 and TCH-08-22, included in Appendix B, for more information. ) 5. For certain vehicles/applications, where turbo-charged inlet air is used, a smaller size compressor may be permissible. Note: Compressor and/or air dryer upgrades are recommended in cases where duty cycle is greater than the normal range (for the examples above). For correct compressor upgrades consult Bendix - Please note that because a compressor is listed in the same area of the chart does not necessarily mean that it would be a suitable candidate for upgrade purposes. For Bendix® Tu-Flo® 550 and 750 compressors, unloader service is recommended every 250, 000 miles. 13 Air Brake Charging System Troubleshooting How to use this guide: Find the symptom(s) that you see, then move to the right to find the possible causes ("What it may indicate") and remedies ("What you should do"). [. . . ] Last but not least, begin using alcohol several weeks prior to freezing weather to ensure that the system is completely protected. Use only methanol alcohol, such as Bendix "Air Guard", in evaporators or injectors. Air Dryers Make certain air brake system leakage is within the limits stated in BW1279. Check the operation and function of the air dryer using the appropriate Service Data Sheet for the air dryer. [. . . ]