User manual BENDIX BX2150 AIR COMP-BW1424-

[. . . ] ® Bendix® BX-2150TM Air Compressor AIR OUTLET (2) (1 NOT SHOWN) WATER OUTLET UNLOADER STOP WATER INLET (NOT SHOWN) AIR INLET WATER OUTLET UNLOADER PORTS INLET VALVE AIR OUTLET AIR INTAKE DISCHARGE VALVE PISTON PISTON RINGS REAR END COVER OIL INLET CRANKSHAFT SLEEVE BEARING OIL SEAL UNLOADER PISTON CONNECTING ROD ROLLER BEARING BX-2150TM AIR COMPRESSOR BELT DRIVE MODEL CRANKSHAFT OIL PASSAGE DESCRIPTION GENERAL The function of the air compressor is to provide and maintain air under pressure to operate devices in the air brake and/or auxiliary air systems. cubic feet per minute at 1250 R. P. M. The BX-2150TM compressor is constructed from two major assemblies, the cylinder head and the crankcase. The cylinder head is an iron casting containing the inlet, discharge and unloader valving. It is installed on the crankcase and is secured using four cap screws symmetrically placed. [. . . ] Connect the compressor discharge port to a reservoir with a volume of 650 cubic inches, including the volume of connecting line. With the compressor operating at 1800 R. P. M. , the time required to raise the reservoir(s) pressure from 0 P. S. I. *During this test, the compressor should be checked for gasket leakage and noisy operation, as well as unloader operation and leakage. *NOTE: With no inlet check valve or air strainer attached to the compressor inlet. TABULATED TECHNICAL DATA Average weight 33 lbs. * Number of cylinders 1 Bore size 3. 375" Stroke 1. 468" Displacement at 1250 R. P. M. Minimum coolant flow (air-cooled) N/A Approximate horsepower required at 1250 R. P. M. at 120 PSIG (naturally aspirated) 1. 7 Turbocharge limits Maximum R. P. M. Maximum pressure (gauge) 15 PSIG Maximum inlet air temperature 250° F Maximum discharge air temperature 400° F Minimum pressure required to unload (naturally aspirated) 60 PSIG (with inlet check valve) 85 PSIG (turbocharged) 85 PSIG Minimum oil pressure required at engine idling speed 5 PSIG Minimum oil pressure required at any engine speed 15 PSIG Oil capacity of self-lubricated model N/A Minimum discharge-line size 1/2" I. D. *Installed weight determined by final mounting configuration. FIGURE 12 WATER PORT 1 3 DISCHARGE PORT WATER PORT GOVERNOR MOUNTING PAD O-RING 4 10 9 7 8 6 5 14 13 12 11 2 UNLOADER KIT The unloader kit is designed for use when unloader piston leakage is detected as described under the Compressor Air Leakage Tests section of this manual. The kit contains the following components which are keyed to Figure 12. 1 1 Description Unloader stop assembly Unloader piston assembly Key 3 4 MAJOR MAINTENANCE KIT The major maintenance kit is designed to rebuild the BX-2150TM compressor head assembly and contains the following parts which are keyed to Figure 12. 1 1 1 1 1 1 1 1 1 1 1 1 1 Description Unloader Kit Discharge Valve Governor Gasket Strainer Gasket Discharge Valve Spring Cylinder Head Gasket Unloader Spring Inlet Valve Gasket Discharge Valve Seat Inlet Valve Stop Inlet Valve Inlet Valve Seat Inlet Valve Spring Key 3&4 12 1 2 13 14 10 9 11 5 7 8 6 14 This troubleshooting guide obsoletes and supersedes all previous published troubleshooting information relative to Bendix air compressors. Advanced Troubleshooting Guide for Air Brake Compressors * The guide consists of an introduction to air brake charging system components, a table showing recommended vehicle maintenance schedules, and a troubleshooting symptom and remedy section with tests to diagnose most charging system problems. INDEX Symptom Air Air brake charging system: Slow build (9. 0) . 30-32 Maintenance & Usage Guidelines Maintenance Schedule and Usage Guidelines (Table A) . 17 *This guide is only for vehicles that use desiccant air dryers. 15 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. [. . . ] These figures are approximate and assume that air system leakage is within the limits of the Bendix "Dual System Air Brake Test and Check List" (BW1279). 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. [. . . ]