HEIGHT SENSING BRAKE PROP. VALVE SETTING PROCEDURE

THIS BULLETIN IS BEING PUBLISHED TO PROVIDE THE CORRECT PROCEDURE TO BE FOLLOWED IN SETTING THE HEIGHT SENSING BRAKE PROPORTIONING VALVE ON APPLICABLE VEHICLES. THIS PROCEDURE MUST BE ADHERED TO WHENEVER AN EXISTING VALVE AND/OR THE LINKAGE IS DISASSEMBLED OR REMOVED TO INSURE CORRECT VALVE OPERATION. (1) RAISE VEHICLE, AXLE MUST BE ALLOWED TO HANG FREE (NO LOAD CONDITION). (2) REMOVE NUT AND DISENGAGE LEVER ASSEMBLY FROM VALVE SHAFT (FIGURE 1). (3) SELECT APPROPRIATE PLASTIC ADJUSTMENT GAGE SHOWN IN CHART BELOW THAT IS AVAILABLE FROM WDDGM: PART NUMBER 14061396 CODE C COLOR BLUE VEHICLE COMBINATION K300 LESS RPO G52 PART NUMBER 14061395 CODE B COLOR BLACK VEHICLE COMBINATION C300 LESS RPO G52 PART NUMBER 14061394 CODE A COLOR GREEN VEHICLE COMBINATION CK300 WITH RPO G52 (4) ROTATE VALVE SHAFT TO PERMIT INSTALLATION OF PLASTIC ADJUSTMENT GAGE. CENTER "D" SHAPED HOLE OF GAGE MUST SEAT OVER "D" SHAPE OF THE VALVE SHAFT AND GAGE TANG MUST BE POSITIONED IN VALVE MOUNTING HOLE (FIGURE 2). (5) REINSTALL LEVER ASSEMBLY TO THE VALVE SHAFT UTILIZING A "C" CLAMP OR CHANNEL LOCK PLIERS TO SEAT LEVER NYLON BUSHING TO SERRATIONS ON THE VALVE SHAFT. NOTICE: DO NOT DRIVE THE LEVER ONTO THE SHAFT USING ATTACHING NUT. DOING SO MAY RESULT IN IMPROPER VALVE SETTING. (6) REINSTALL VALVE SHAFT NUR AND TORQUE TO 8-11 N.M (70-98 IN LBS.) (7) SEVER GAGE TANG FROM BODY OF THE ADJUSTMENT GAGE TO ALLOW THE VALVE ASSEMBLY TO ROTATE FREELY (FIGURE 3). (8) LOWER VEHICLE AND TEST BRAKES. ILLUSTRATION

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