BENDIX TCH-001-062 User's Manual
Contents
1. cut in pressure for each truck shall be 100 PSI or greater In response to this rule change Bendix recommends compressor air governors such as the D 2 and D 2A with a nominal cut in pressure of 110 PSI for nearly all applications especially towing vehicles Bendix Cut in Cut out Governor Type Part Number Pressure Range Application 277486N 110 130 psi Standard Temperature 109662N 110 130 psi High Temperature K025308 110 130 psi Standard Temperature The following is a listing of our most popular service replacement governors For additional information please contact the Bendix TechTeam by calling 1 800 AIR BRAKE 1 800 247 2725 or visit www bendix com 2011 Bendix Commercial Vehicle Systems LLC a member of the Knorr Bremse Group 6 2011 All rights reserved2. Technical Bulletin Bulletin No TCH 001 062 Effective Date 6 1 2011 Cancels N A Page 1 of 1 Subject BENDIX D 2 AND D 2A GOVERNOR OPERATING PRESSURES Our sales data indicates that Bendix governors such as part number 275491N with a nominal cut in pressure of 100 PSI remain very popular service replacement components It is important to note however that they may not be the correct service replacement for the governor being replaced Bendix does not recommend using governors with settings other than that which is specified by the OEM for cut in and cut out pressure to ensure proper system operation Effective 10 8 1992 US regulations Federal Motor Vehicle Safety Standard FMVSS 121 for new vehicles requires that all trailer spring brake control valves protect the trailer supply line to 70 PSI minimum closing in the event of a trailer service reservoir failure Due to the higher opening pressures of these trailer valves an air compressor cut in pressure of 100 PSI or greater was mandated by regulation to ensure that the trailer would always charge if the system pressure on the towing vehicle was within the normal compressor governor operating range The specific language from FMVSS 121 for this requirement which had an effectivity date of 3 1 1997 is as follows S5 1 1 1 Air compressor cut in pressure The air compressor governor cut in pressure for each bus shall be 85 PSI or greater The air compressor governor
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