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BENDIX BW2739 User's Manual

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1. SD 03 4656 Bendix SRC 7000 Trailer Spring Brake Valve 14 NPT CONTROL 1 4 NPT SUPPLY 1 2 NPT SPRING BRAKE 3 8 NPT RESERVOIR DELIVERY 4 EXHAUST EXHAUST FIGURE 7 BENDIX SRC 7000 TRAILER SPRING BRAKE VALVE DESCRIPTION PORTS The Bendix SRC 7000 trailer spring brake valve is 1 1 2 NPT Spring Brake Reservoir Mounting RES a reservoir mountea trailer valve that can control up to 4 1 4 18 NPT Trailer Supply 1 SUP six spring brake actuators during parking or emergency applications It has the following capabilities 1 1 4 18 NPT Trailer Service 4 CONT Automatically applies trailer spring brakes in the event 3 8 18 NPT Delivery 2 DEL of a breakaway or trailer supply line failure 1 Exhaust 3 EXH Protects trailer reservoir s air pressure in the event of a breakaway or trailer supply line failure The SRC 7000 trailer spring brake valve consists Does not allow an automatic trailer spring brake of a composite body pressure protection valve and application with air pressure loss in trailer reservoir s reservoir mounting nipple Allows the trailer spring brakes to be applied and released repeatedly with a failed trailer reservoir s Anti compounding prevents an overriding service brake Signal while the trailer supply line is at atmospheric pressure Does not allow service system charging if a failure occurs in the parking brake circuit Muffler amp snorkel c
2. TRAILER SUPPLY TRAILER SERVICE SERVICE SPRING BRAKE RESERVOIR CONNECTION Se SERVICE RELAY VALVE SPRING BRAKE CHAMBER FIGURE 7 ANTI COMPOUNDING APPLICATION ANTI COMPOUNDING SEE FIGURE 7 The Bendix SRC 7000 trailer spring brake valve has an anti compounding feature See Figure 7 A single check valve in the SRC 7000 valve cover prevents brake compounding simultaneous spring brake and service brake application which creates extra load on foundation brake components If a trailer service application is being made and at the same instant a park application is made air in the service line closes the anti compounding section of the SRC 7000 valve The air then flows out of the supply port and exhausts through the tractor protection control Future compounding is prevented by the closed tractor protection valve The anti compounding port should not be used on towing trailers See Figure 2 GENERAL SAFETY GUIDELINES WARNING PLEASE READ AND FOLLOW THESE INSTRUCTIONS TO AVOID PERSONAL INJURY OR DEATH When working on or around a 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 SUPPLY DELIVERY EXHAUST working in the engine compartment the engine shoul
3. designed specifically for such applications and systems 9 Components with stripped threads or damaged parts should be replaced rather than repaired Do not attempt repairs requiring machining or welding unless specifically stated and approved by the vehicle and component manufacturer 10 Prior to returning the vehicle to service make certain all components and systems are restored to their proper operating condition 11 For vehicles with Antilock 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 PREVENTIVE MAINTENANCE Important Review the Bendix Warranty Policy before performing any intrusive maintenance procedures A warranty may be voided if intrusive maintenance is performed during the warranty period 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 SRC 7000 trailer spring brake valve should be inspected every 6 months or 1500 operating hours whichever comes first for proper operation Should the SRC 7000 valve not meet the elements of the operational tests noted in this document further investigation and service of the valve may be required SERVICE CHECKS 1 Remove any a
4. apable TRAILER SERVICE TRAILER SUPPLY Cath Trailer Schematic TRAILER SERVICE fe c Me 2 R 12P PILOT RELAY VALVE SRC 7000 VALVE TRAILER SUPPLY UC Towing Trailer Schematic SRC 7000 VALVE ss TO ACCESSORIES DUMMY COUPLING SERVICE BRAKE CHAMBER QUICK RELEASE SERVICE RELAY VALVE DUMMY COUPLING FIGURE 2 TYPICAL SYSTEM SCHEMATICS WITH A BENDIX SRC 7000 TRAILER SPRING BRAKE VALVE 2 TRAILER SUPPLY TRAILER SERVICE SERVICE SPRING BRAKE RESERVOIR CONNECTION SERVICE RELAY VALVE SPRING BRAKE CHAMBER FIGURE 3 CHARGING BELOW 85 PSI OPERATION CHARGING BELOW 85 PSI SEE FIGURE 3 Air flows through the trailer supply line enters the trailer Supply portof the Bendix SRC 7000 trailer spring brake valve sealing the anti compound section The air passes through the quick release portion and out of the delivery port to the spring brakes The air pressure then releases the spring brakes SUPPLY DELIVERY EXHAUST CHARGING ABOVE 85 PSI SEE FIGURE 4 Once the air pressure in the valve builds to 85 psi the air pressure flows into the trailer service reservoir s The trailer braking system is now in the normal run mode Service braking occurs through the trailer service re
5. ccumulated contaminants Visually inspect the valve s exterior for excessive corrosion or physical damage Replace the valve as necessary 2 Inspect all air lines connected to the valve for signs of wear or physical damage Repair or replace as necessary 3 Test air line fittings for excessive leakage and tighten or replace as necessary OPERATIONAL AND LEAKAGE TESTS Check the tractor dash gauge againsta gauge known to be accurate before performing these tests Connectthe tractor air lines to the trailer on which the SRC 7000 valve is to be tested Block all wheels or hold the vehicles by means other than the air brakes 1 Install a gauge in the trailer reservoir s Build the tractor and trailer to full system pressure by placing the park control valve and the trailer air supply valve in the charge position As system pressure reaches approximately 75 95 psi the trailer spring brakes should also build up to approximately 75 95 psi before the reservoir s begin to charge 2 When full system pressure is reached and the spring brakes are fully released apply a soap solution to the SRC 7000 valve exhaust port and the vent A 1 bubble in 5 seconds is permissible 3 Placethe trailer air supply valve in the exhaust position The spring brakes should apply Disconnect the trailer supply line and apply a soap solution to check for leaks A 1 bubble in 5 seconds is permissible 4 Reconnect the trailer supply hose coupling and r
6. d be shut off and the ignition key should be removed Where circumstances require that the engine be in operation EXTREME CAUTION should be used to prevent personal injury resulting from contact with moving rotating leaking heated or electrically charged components 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 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 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
7. echarge the trailer system The spring brakes should release Shut off the engine and then open the trailer reservoir drain cock The tractor air system should bleed down to approximately 70 psi The trailer spring brakes should remain released 5 Ifthe SRC 7000 valve does notfunction as described or if leakage is excessive repair the valve or replace with a genuine Bendix service replacement valve Leakage through the welds is acceptable REMOVAL 1 Identify and mark or label all air lines and their connections on the SRC 7000 valve Then disconnect the air lines 2 Remove the SRC 7000 valve from the reservoir INSTALLATION 1 Install the SRC 7000 valve on the reservoir 2 Reconnectallairlines to the valve using the identification made in REMOVAL step 1 Install all fittings 2 to 2 1 2 turns past finger tight 4 Perform OPERATIONALAND LEAKAGE TESTS before placing the vehicle back in service BW2739 O 2010 Bendix Commercial Vehicle Systems LLC All rights reserved 08 2010 Printed in U S A amp Printed on recycled paper
8. lay valve TRAILER SUPPLY TRAILER SERVICE SERVICE SPRING BRAKE RESERVOIR CONNECTION SERVICE RELAY VALVE DELIVERY SPRING JT BRAKE CHAMBER FIGURE 4 CHARGING ABOVE 85 PSI EXHAUST TRAILER SUPPLY TRAILER SERVICE SERVICE SPRING BRAKE RESERVOIR lt CONNECTION COM SIE ck ei 4 db d a Ei 1 at NEN CN SERVICE RELAY VALVE ES SPRING BRAKE CHAMBER gl FIGURE 5 PARKING APPLICATION PARK APPLICATION SEE FIGURE 5 To park the trailer either the trailer air supply valve or the system park control valve in the tractor is actuated This vents the trailer supply line The service reservoir is sealed off The quick release section no longer under supply pressure is moved by air pressure from the spring brake chamber The exhaust opens allowing air from the spring brakes to exhaust through the open passage Br SUPPLY 9 e DELIVERY EXHAUST OPERATION WITH A FAILED RESERVOIR SEE FIGURE 6 Should trailer reservoir pressure be lost trailer service braking is no longer available The Bendix SRC 7000 valve s internal spring force will trap approximately 70 psi Supply pressure thus preventing spring brake parking TRAILER SUPPLY TRAILER SERVICE SERVICE SPRING BRAKE RESERVOIR CONNECTION SERVICE RELAY VALVE SPRING BRAKE CHAMBER ell FIGURE 6 OPERATION WITH A FAILED RESERVOIR SUPPLY DELIVERY EXHAUST

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