BENDIX 03-A-5 User's Manual
Contents
1. SUB ASSY AND DETAIL REFERENCE QUAN amp B DO PO DO e rR N e The SR 2 is a key valve in the 121 Trailer Air Brake System Generally installed in the required spring brake release reservoir it is responsible for controlling the application and release of the spring brakes both during emergency situations and normal parking It protects and isolates the spring brake reservoir preventing automatic brake application in the event of trailer service system failure The SR 2 also provides the ability to release the trailer spring brakes at least once subsequent to their application For Service Maintenance information see Service Data Sheet SD 03 43 MAINTENANCE KIT PC NO 287691 WEIGHT 2 6 LBS VMRS NO IS 13 010 048 DEVICE CODE IS 4510 DESCRIPTION Control Piston 0 Ring Cover 0 Ring Spring Valve Includes Cup 238381 0 Ring Inlet Valve Spring Pipe Plug 34 Check Valve Assy Check Valve Check Valve Spring Machine Screw SR 2 TRAILER FOR SERVICE RETAINER DIAPHRAGM WASHER SCREW FITTING A SPRING BRAKE OR REMFR PIPE TAD VALVE EXCH USE SIZE PC NO PC NO PC NO PC NO PC NO PC NO PC NO NONE 291159 Y 246370 291159 y NONE 292048 y 287375 287376 287376 287376 B288497 288497 NONE NONE NONE 246367 246368 246369 NONE NONE NONE B Add Two 2 Pipe Plug 238807 34 in two bottom del ports OCTOBER 19862. I 214747 1 O Ring USE A 1 Valve Stop PC NO PC NO m e a aos me ade FOE Rice tad 286834 286364 MACK 20QE 3110R 245257 1 Piston 20QE 1278R A 1 Piston Spring 286893 286364 FORD D5HA 2B431 AA 291925 2 Machine Screw amp L W 287252 286364 WHITE 78203 0001 292247 4 Machine Screw amp L W 287278 287278 KENWORTH K295 127 A Furnished in Maintenance Kit 287072 B288063 288063 JHC 459271 C92 A Furnished in Maintenance Kit 287072 B Maintenance Kit for this SR 1 is PC NO 288271 THIS CATALOG SUPERSEDES Bwo9021 10 1986 Printed in U S A CATALOG 03 A 5 PRINTED REV 12 80 vA P T SER RES PORTS 2 a SERVICE PARTS SR 2 TRAILER SPRING BRAKE VALVE catacocQ3 A 5B RETAINER DIAPHRAGM WASHER ah PT esooy PARTIAL VIEW OF EXHAUST DELIVERY WIDTH FOR PC NO 287376 PORTS 4 l 2 3 10 5 54 mE He ll Ni ea E gt E i i 13 a ei ro ball i 14 igre ii wae tit pte Lill 2 ga 16 P T a SP BRK RES i P T PORT TRLR gt O oo Oonmt MD OS WPNFe SFrrrrr gt rgr 291154 203706 202981 A PC NO QUAN 1 1 1 1 1 1 1 1 1 l 4 4 1 17 34 PLT SUPPLY EXHAUST PORT 5 47 COMMON SERVICE PARTS DESCRIPTION PC NO Spring 291156 Spring Retainer A Piston Assy 291157 Piston Inlet Valve Spring O Ring Retaining Ring Stem Inlet amp Exhaust Valve Body Cap Screw Lock Washer Sealing Ring 243683 A Furnished in Maintenance Kit 287691
3. SERVICE PARTS SR 1 SPRING BRAKE VALVE cataro 03 A 5 The SR 1 Spring Brake Valve is commonly found on trucks with dual air brake systems The function of the 31 SR 1 is to modulate the spring brakes through application of the foot brake valve in the event of loss of rear axle service brake pressure This action takes advantage of the drivers natural reaction to apply the foot brake valve in an emergency brake situation and eliminates the need to actuate dash mounted controls Spring brake release pressure is limited to 90 95 PSI by the SR 1 Normal parking functions are also controlled through the SR 1 y P T For Service Maintenance information see Service RES 1 l Data Sheet SD 03 87 MAINTENANCE KIT PC NO 287072 y P T WEIGHT 1 7 LBS eee CONTROL I Vy P T VMRS NO IS 13 010 048 4 P T DELIVERY 30 SUPPLY DEVICE CODE IS 3086 COMMON SERVICE PARTS 4 20 NO PC NO QUAN DESCRIPTION 1 A 1 Piston Spring 2 290404 l Cover 3 A 1 O Ring 4 290405 1 Piston 5 A 1 0 Ring 6 290399 1 Body 7 288252 1 Check Valve Assy 8 A l Check Valve 9 A 1 Check Valve Spring 230576 1 Pipe Plug 243968 1 Exhaust Cover A l Diaphragm 1 Inlet amp Exhaust Valve Assy 17 16 1514 12 1 Retaining Ring 1 O Ring 13 ji 0 Ring A Valve Guide SUB ASSY AND DETAIL REFERENCE 1 Valve Spring l Valve Retainer FOR CUSTOMER A LIMITING 1 Inlet amp Exhaust Valve SERVICE OR IDENTIFICATION SPRING PRESS 202620 1 Cap Nut REMFR EXCH P S
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