User manual BENDIX TU-FLO 400-500-1000 AIR COMPRESSOR

[. . . ] ® Bendix® TU-FLO® 400, 500, 1000 Air Compressors TU-FLO® 400 Air Compressor TU-FLO® 500 Air Compressor TU-FLO® 1000 Air Compressor 1 SD-01-326 DESCRIPTION AND OPERATION GENERAL The function of the air compressor is to build up and maintain the air pressure required to operate air powered devices in air brake or air auxiliary systems. and they have no external moving parts. Both air and water cooled type compressors are available. Various mounting and drive adaptations are used as required by different vehicle engine designs (Fig. 4). DESCRIPTION Tu-Flo® Type 400, 500, and 1000 compressors are single stage, reciprocating piston type compressors. [. . . ] 27 Compressor: Constantly cycles (15. 0) . 28 Reservoir: Safety valve releases air (13. 0) . 27 Page Number Symptom Coolant Compressor leaks coolant (17. 0) . 19 Oil is present: On the outside of the compressor (2. 0) . 20 At the air dryer purge/exhaust or surrounding area (3. 0) . 24 In the ping tank or compressor discharge aftercooler (8. 0) . 24 Page Number Test Procedures (1) Oil Leakage at Head Gasket . 29 (3) Compressor Discharge and Air Dryer Inlet Temperature . 32-34 Maintenance & Usage Guidelines Maintenance Schedule and Usage Guidelines (Table A) . 18 *This guide is only for vehicles that use desiccant air dryers. 16 Introduction to the Air Brake Charging System Powered by the vehicle engine, the air compressor builds the air pressure for the air brake system. The air compressor is typically cooled by the engine coolant system and lubricated by the engine oil supply. The compressor's unloader mechanism and governor (along with a synchro valve for the Bendix® DuraFloTM 596 air compressor) control the brake system air pressure between a preset maximum and minimum pressure level by monitoring the pressure in the service (or "supply") reservoir. When the air pressure becomes greater than that of the preset "cut-out", the governor controls the unloader mechanism of the compressor to stop the compressor from building air and also causes the air dryer to purge. As the service reservoir air pressure drops to the "cut-in" setting of the governor, the governor returns the compressor back to building air and the air dryer to air drying mode. As the atmospheric air is compressed, all the water vapor originally in the air is carried along into the air system, as well as a small amount of the lubricating oil as vapor. The duty cycle is the ratio of time the compressor spends building air to the total engine running time. Air compressors are designed to build air (run "loaded") up to 25% of the time. Higher duty cycles cause conditions that affect air brake charging system performance which may require additional maintenance. Factors that add to the duty cycle are: air suspension, additional air accessories, use of an undersized compressor, frequent stops, excessive leakage from fittings, connections, lines, chambers or valves, etc. The discharge line allows the air, water-vapor and oil-vapor mixture to cool between the compressor and air dryer. The typical size of a vehicle's discharge line, (see column 2 of Table A on page 18) assumes a compressor with a normal (less than 25%) duty cycle, operating in a temperate climate. See Bendix and/or other air dryer manufacturer guidelines as needed. [. . . ] Here are some Do's and Don'ts for prevention and thawing. Do maintain freeze prevention devices to prevent road calls. Don't let evaporators or injectors run out of methanol alcohol or protection will be degraded. Check the air dryer for proper operation and change the desiccant when needed. [. . . ]