BENDIX SD-03-817 User's Manual
Contents
1. 5 Remove the four hex head cap screws securing the lower body to the upper body and separate the body halves 6 Remove the rubber seal ring 14 from the lower body BENDIX E 6 BRAKE VALVE ONLY Figure 3 7 While applying thumb pressure to the primary piston lift out and up on the three lock tabs of the primary piston retainer 15 BENDIX E 10 BRAKE VALVE ONLY Figure 4 8 A While depressing the spring seat 7 remove retaining ring 8 B Remove the spring seat and coil spring 5 9 Using a 3 8 wrench hold the lock nut 16 on the threaded end of the stem 17 in the primary piston 2 Inserta screwdriver in the exhaust passage through the center of the valve and engage the slotted head of the stem 10 Remove lock nut 16 spring seat 18 stem spring 19 primary piston 2 and primary piston return spring 6 Remove o ring 34 11 Remove adapter 1 Remove o ring 4 from adapter Caution Before proceeding with the disassembly refer to Figure 4 and note that the lock nutand stem are used to contain the primary piston return spring stem spring and the relay piston spring The combined force of these Springs is approximately 50 pounds and care must be taken when removing the lock nut as the spring forces will be released It is recommended that the primary piston and relay piston be manually or mechanically contained while the nut and stem are being removed BENDIX E 6 BRAKE V2. 8 P T PRIMARY 3 8 P T SECONDARY EXHAUST SUPPLY FIGURE 2 BENDIX E 10 DUAL BRAKE VALVE The primary circuit of the valve is similar in operation to a standard single circuit air brake valve and under normal operating conditions the secondary circuit is similar in operation to a relay valve Both primary and secondary circuits of the brake valve use a common exhaust protected by an exhaust diaphragm OPERATION APPLYING NORMAL OPERATION PRIMARY CIRCUIT PORTION When the brake treadle is depressed the plunger exerts force on the spring seat graduating spring and primary piston The primary piston which contains the exhaust valve seat closes the primary exhaust valve As the exhaust valve closes the primary inlet valve is moved off its seat allowing primary air to flow out the primary delivery port FIGURE 3 BENDIX E 6 DUAL BRAKE VALVE SECTIONAL DIAGRAM APPLYING NORMAL OPERATION SECONDARY CIRCUIT When the primary inlet valve is moved off its seat air is permitted to pass through the bleed passage and enters the relay piston cavity The air pressure moves the relay piston which contains the exhaust seat and closes the secondary exhaust valve As the secondary exhaust valve closes the secondary inlet valve is moved off its seat allowing the secondary air to flow out the secondary delivery port Because of the small volume of air required to move the relay piston action of the secondary
3. ALVE ONLY 12 Using a screwdriver to restrain the stem as in step nine remove the lock nut 16 spring seat 18 and stem spring 19 13 Remove the relay piston 20 relay piston spring 21 primary piston and primary piston return spring 23 from the upper body Use care so as not to nick seats Note Certain E 6 brake valves do not have a relay piston spring 21 If this spring is not found do not install a replacement 14 On valves manufactured after October 7 1976 a small washer 24 will be found in the cavity in the lower side of the primary piston 22 15 Disassemble the primary piston by rotating the spring seat nut 25 counterclockwise Separate the spring seat nut spring seat 26 rubber spring 27 and remove the piston o ring 28 16 Remove the large 30 and small 31 o rings from the relay piston 20 17 Remove the retaining ring 32 securing the primary inletand exhaust valve assembly 33 in the upper body and remove the valve assembly CLEANING AND INSPECTION 1 Wash all metal parts in mineral spirits and dry Inspect all parts for excessive wear or deterioration Inspect the valve seats for nicks or burrs Check the springs for cracks or corrosion OF oN Replace all rubber parts and any part not found to be serviceable during inspection using only genuine Bendix brand replacement parts ASSEMBLY Prior to reassembling lubricate all o rings o ring grooves piston bores and
4. LACK 46 CHAMBER ADJ USTER BENDIX E 6 OR E 10 DUAL BRAKE VALVE GOVERNOR nn ty ba SUPPLY RESERVOIR WET TANK COMPRESSOR FIGURE 5 TYPICAL PIPING SCHEMATIC BENDIX BP R1 BOBTAIL PROPORTIONING VALVE 1 SERVICE RESERVOIR 2 SERVICE RESERVOIR SERVICE CHECKS OPERATING CHECK Check the delivery pressure of both primary and secondary circuits using accurate test gauges Depress the treadle to several positions between the fully released and fully applied positions and check the delivered pressure on the test gauges to see thatit varies equally and proportionately with the movement of the brake pedal After a full application is released the reading on the test gauges should fall off to zero promptly It should be noted that the primary and secondary delivery pressures may vary by up to 5 psi for standard valves or up to 7 5 psi for high differential valves with both supply reservoirs at the same pressure This is normal for this valve Important A change in vehicle braking characteristics or a low pressure warning may indicate a malfunction in one or the other brake circuit and although the vehicle air brake system may continue to function the vehicle should not be operated until the necessary repairs have been made and both braking circuits including the pneumatic and mechanical devices are operating normally Always check the v
5. TREADLE MOUNTING PLATE 3 8 P T PRIMARY DELIVERY gt 3 8 P T SECONDARY DELIVERY n 3 8 P T PRIMARY o SUPPLY 3 8 P T SECONDARY SUPPLY EXHAUST FIGURE 1 BENDIX E 6 DUAL BRAKE VALVE DESCRIPTION The Bendix E 6 Figure 1 and E 10 Figure 2 dual brake valves are floor mounted treadle operated type brake valves with two separate supply and delivery circuits for service primary and secondary braking Each provides the driver with a graduated control for applying and releasing the vehicle brakes The E 10 dual brake valve Figure 2 is similar to the E 6 dual brake valve except that a metal coil spring housed in an upper body assembly replaces the rubber spring used in the E 6 valve The use of a metal coil spring and the upper body assembly provides greater treadle travel and therefore provides the driver with a less sensitive feel when making a brake application The E 10 dual brake valve is generally used on buses where smooth brake applications contribute to passenger comfort The circuits in the Bendix E 6 E 10 dual brake valves are identified as follows The primary circuit is that portion of the valve between the spring seat which contacts the plunger and the relay piston the secondary circuit is that portion between the relay piston and the exhaust cavity SD 03 817 TREADLE MOUNTING PLATE 3 8 P T PRIMARY DELIVERY n SECONDARY DELIVERY 3
6. circuit of the valve is almost simultaneous with the primary circuit portion APPLYING LOSS OF AIR IN THE SECONDARY CIRCUIT Should air be lost in the secondary circuit the primary circuit will continue to function as described above under Normal Operation Primary Circuit Portion APPLYING LOSS OF AIR IN THE PRIMARY CIRCUIT Should air be lost in the primary circuit the function will be as follows as the brake treadle is depressed and no air pressure is present in the primary circuit supply and 2 FIGURE 4 BENDIX E 10 DUAL BRAKE VALVE SECTIONAL DIAGRAM delivery ports the primary piston will mechanically move the relay piston allowing the piston to close the secondary exhaust valve and open the secondary inlet valve allowing air to flow out the secondary delivery port BALANCED PRIMARY CIRCUIT When the primary delivery pressure acting on the piston equals the mechanical force of the brake pedal application the primary piston will move and the primary inlet valve will close stopping further flow of air from the primary supply line through the valve The exhaust valve remains closed preventing any escape of air through the exhaust port BALANCED SECONDARY CIRCUIT When the air pressure on the secondary side of the relay piston approaches that being delivered on the primary side of the relay piston the relay piston moves closing the secondary inlet valve and stopping further flow of air from the supply lin
7. e stem 9 Place the washer 24 over the stem This washer should be installed in all valves 10 Install primary return spring 23 in upper body piston bore 11 Install the primary piston rubber spring sub assembly steps 4 amp 5 over the stem into the upper body piston bore 12 Compress the primary and relay pistons into the upper body from either side and hold them compressed either manually or mechanically See the cautionary note under step 11 in the Disassembly section of this manual 13 Place the stem spring 19 over the spring seat nut 25 and the spring seat 18 over the stem 14 Install the lock nut 16 on the stem and torque to 20 30 inch pounds 15 Install the primary piston retainer 15 over the piston making certain all three lock tabs have engaged the outer lip of the body GENERAL SAFETY GUIDELINES WARNING PLEASE READ AND FOLLOW THESE INSTRUCTIONS TO AVOID PERSONAL INJURY OR DEATH Whenworking on or arounda vehicle the following general precautions should be observed at all times 1 Park the vehicle on a level surface apply the parking brakes and always block the wheels Always wear safety glasses 2 Stop the engine and remove ignition key when working under or around the vehicle When working in the engine compartment the engine should be shut off and the ignition key should be removed Where circumstances require that the engine be in operation EXTREME CAUTION should be u
8. e through the valve The exhaust remains closed as the secondary delivery pressure balances the primary delivery pressure When applications in the graduating range are made a balanced position in the primary circuit is reached as the air pressure on the delivery side of the primary piston equals the effort exerted by the driver s foot on the treadle A balanced position in the secondary portion is reached when air pressure on the secondary side of the relay piston closely approaches the air pressure on the primary side of the relay piston When the brake treadle is fully depressed both the primary and secondary inlet valves remain open and full reservoir pressure is delivered to the actuators RELEASING PRIMARY CIRCUIT With the brake treadle released mechanical force is removed from the spring seat graduating spring and primary piston Air pressure and spring load moves the primary piston opening the primary exhaust valve allowing air pressure in the primary delivery line to exhaust out the exhaust port RELEASING SECONDARY CIRCUIT With the brake treadle released air is exhausted from the primary circuit side of the relay piston Air pressure and spring load move the relay piston opening the secondary exhaust valve allowing air pressure in the secondary delivery line to exhaust out the exhaust port PREVENTIVE MAINTENANCE Important Review the Bendix Warranty Policy before performing any intrusive maintenance proc
9. edures A warranty may be voided if intrusive maintenance is performed during the warranty period BENDIX TRAILER No two vehicles operate under identical conditions as a result maintenance intervals may vary Experience is a valuable guide in determining the best maintenance interval for air brake system components At a minimum the Bendix E 6 E 10 valves should be inspected every 6 months or 1500 operating hours whichever comes first for proper operation Should the E 6 E 10 valves not meet the elements of the operational tests noted in this document further investigation and service of the valve may be required Visually check for physical damage to the brake valve such as broken air lines and broken or missing parts Every three 3 months 25 000 miles or 900 operating hours Clean any accumulated dirt gravel or foreign material away from the heel of the treadle plunger boot and mounting plate Lubricate the treadle roller roller pin and hinge pin with Barium grease per BW 204 M Bendix part 246671 Check the rubber plunger boot for cracks holes or deterioration and replace if necessary Also check mounting plate and treadle for integrity Apply a thin layer of Barium grease per BW 204 M Bendix part 246671 between plunger and mounting plate do not over oil BENDIX TP 5 TRACTOR PROTECTION VALVE b CONTROL VALVE SLACK ADJ USTER SPRING BRAKES BRAKE S
10. ehicle brake system for proper operation after performing brake work and before returning the vehicle to service LEAKAGE CHECK 1 Make and hold a high pressure 80 psi application 2 Coatthe exhaust port and body of the brake valve with a soap solution 3 Leakage permitted is a 1 bubble in 3 seconds If the brake valve does not function as described above or leakage is excessive it is recommended that it be replaced with a new or remanufactured unit or repaired with genuine Bendix parts available at authorized Bendix parts outlets REMOVAL 1 Check the vehicle wheels or park the vehicle by mechanical means Drain all air system reservoirs 2 Identify and disconnect all supply and delivery lines at the brake valve 3 Remove the brake valve and treadle assembly from the vehicle by removing the three cap screws on the outer bolt circle of the mounting plate The basic brake valve alone can be removed by removing the three cap screws on the inner bolt circle DISASSEMBLY Figures 3 and 4 1 If the entire brake valve and treadle assembly was removed from the vehicle remove the three cap screws securing the treadle assembly to the basic brake valve 2 Remove the screw 9 securing the exhaust diaphragm 10 and washer 11 to the exhaust cover 12 3 Remove the four screws that secure the exhaust cover 12 to the lower body 4 Remove the Secondary inlet and exhaust valve assembly 13 from the lower body
11. er than repaired Do not attempt repairs requiring machining or welding unless specifically stated and approved by the vehicle and component manufacturer Prior to returning the vehicle to service make certain all components and systems are restored to their proper operating condition For vehicles with Automatic Traction Control ATC the ATC function must be disabled ATC indicator lamp should be ON prior to performing any vehicle maintenance where one or more wheels on a drive axle are lifted off the ground and moving j BW1427 2010 Bendix Commercial Vehicle Systems LLC All rights reserved 6 2010
12. metal to metal moving surfaces with Dow Corning 55 M pneumatic grease Bendix piece number 291126 Note All torques specified in this manual are assembly torques and can be expected to fall off after assembly is accomplished Do not retorque after initial assembly torques fall 1 Install the primary inlet and exhaust assembly 33 in the upper body and replace the retaining ring 32 to secure it Be sure the retaining ring is seated completely in its groove 2 Install the large 30 and small 31 o rings on the relay piston 3 Install the primary piston o ring 28 in the piston o ring groove BENDIX E 6 BRAKE VALVE ONLY 4 Install the rubber spring do not lubricate 27 concave side down in the primary piston 22 and place the spring seat 26 flat side up over the rubber spring 5 Install the primary piston spring seat nut 25 with its hex closest to the spring seat and rotate clockwise until the top surface of the spring seat is even with the top surface of the piston Set aside 6 Install large 30 and small 31 o rings on relay piston 20 7 Place relay piston spring 21 if used in concave portion of relay piston and install relay piston through No 1 inlet exhaust assembly 33 and into under side of upper body 8 Place screwdriver blade up in vise Place stem 17 in relay piston upper body sub assembly over the blade of the screwdriver with blade engaged in the slotin the head of th
13. sed to prevent personal injury resulting from contact with moving rotating leaking heated or electrically charged components 3 Do not attempt to install remove disassemble or assemble a component until you have read and thoroughly understand the recommended procedures Use only the proper tools and observe all precautions pertaining to use of those tools 4 If the work is being performed on the vehicle s air brake system or any auxiliary pressurized air systems make certain to drain the air pressure from all reservoirs before beginning ANY work on the vehicle If the vehicle is equipped with a Bendix AD IS air dryer system or a dryer reservoir module be sure to drain the purge reservoir Following the vehicle manufacturer s recommended procedures deactivate the electrical system in a manner that safely removes all electrical power from the vehicle Never exceed manufacturer s recommended pressures Never connect or disconnect a hose or line containing pressure it may whip Never remove a component or plug unless you are certain all system pressure has been depleted 8 10 Use only genuine Bendix brand replacement parts components and kits Replacement hardware tubing hose fittings etc must be of equivalent size type and strength as original equipment and be designed specifically for such applications and systems Components with stripped threads or damaged parts should be replaced rath
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