BENDIX BW1575 User's Manual
Contents
1. _ SUPPLY VALVE E G MV 3 MODULE SERVICE LINE SHUT OFF PISTON FROM FRONT SERVICE FROM REAR SERVICE FIGURE 2 BENDIX TP 5 TRACTOR PROTECTION VALVE SCHEMATIC DIAGRAM 1 EXHAUST CHECK VALVE DIAPHRAGM 8 FIGURE 3 BENDIX TP 5 TRACTOR PROTECTION VALVE END SECTIONAL VIEW passage see Figure 2 With common air to the supply side and service side of the manifold the valve should open at approximately 45 psi If the Bendix MV 3 tractor supply valve is manually or automatically moved to the exhaust position the service line shut off valve will close at approximately 10 psi and the exhaust passage in the plunger will vent the trailer service line DOUBLE CHECK VALVES The two double check valves in the Bendix TP 5 valve as seen in schematic view Figure 2 serve to pick up the highest pressure service signal from either the tractor front brake circuit rear brake circuit or TC valve signal operating the trailer brakes accordingly The stop light switch port also picks up this signal and actuates the stop light switch SERVICE LINE QUICK RELEASE VALVE The trailer service line port is located in the cover as seen in Figure 3 This cover also houses a quick release valve Diaphragm Item 1 in Figure 3 seals off the exhaust port on application and upon release of service line application permits the trailer service line air to exhaust through the exhaust port thus2. Bendix TP 5 Tractor Protection Valve DESCRIPTION The Bendix TP 5 tractor protection valve is a panel or cross member mounted unit designed to replace the Bendix TP 3 valve plus two additional double check valves and quick release functions It may be used in conjunction with the Bendix MV 3 module or independently It contains a service line shut off valve with exhaust function a service line quick release valve and two double check valves OPERATION The function of the TP 5 valve is to receive all pneumatic Signals pertinent to the operation of the trailer brake system transmit the same to the trailer and also to protect the tractor air supply in case of separation of the connecting lines to the trailer TRACTOR PROTECTION PORTION Air from the trailer supply control valve in the cab such as the MV 3 module enters at the trailer supply delivery port and passes out the trailer supply port and simultaneously acts upon the service line shut off piston moving the service line inlet valve off its seat and opening the service line TO TRAILER FROM TC VALVE SERVICE STOP LIGHT SD 03 3655 3 8 NPT 3 8 PTC FRONT SERVICE REAR SERVICE 1 2 NPT TRAILER SUPPLY 1 4 PTC STOP LIGHT SWITCH EXHAUST 1 2 NPT TRAILER SERVICE 3 8 NPT TRAILER CONTROL FIGURE 1 BENDIX TP 5 TRACTOR PROTECTION VALVE EXTERIOR SERVICE LINE wal TO TRAILER SUPPLY EMERGENCY FROM TRAILER
3. Clean all metal parts in mineral spirits and dry them completely 2 Inspect all parts for excessive wear or deterioration Inspect valve seats for nicks or burrs Check the valve spring for cracks or corrosion 3 Inspect the bores of the valve housing for deep scuffing or gouges Replace all parts that were discarded and any parts not found to be serviceable during inspection using only genuine Bendix replacement parts ASSEMBLY Before assembling the TP 5 valve lubricate all o rings o ring grooves body bores and rubbing surfaces with Bendix silicone lubricant Pc No 291126 or equivalent NOTE When using pipe thread sealant during assembly and installation take particular care to prevent the sealant from entering the valve itself Apply the sealant beginning with the second thread back from the end 1 Re install inlet valve 2 spring 16 and lock ring 15 in body See Figure 4 2 Install shuttle guides 14 and shuttles 9 and their respective cap nuts 10 and 11 3 Install the o rings 5 and 6 on the service line shut off plunger 19 and install spring 20 plunger and corresponding cap nut 12 with o ring 7 4 Position the quick release valve diaphragm in the body 18 and the o rings 3 and 4 on the cover and install the cover in its cavity in the body See Figure 3 5 Replace the exhaust seal diaphragm 8 in the cover TESTING Test the re assembled valve per Operating and Leaka
4. the brake valve Make a foot brake application and observe for leakage at the PCD delivery port 12 Reconnect the primary circuit line and reverse the procedure with the secondary circuit line SCD Excessive leakage in either 11 or 12 indicates a faulty double check valve shuttle Restore the secondary circuit connection to the TP 5 valve If the valve does not function as described above or leakage is excessive the valve should be exchanged or replaced at the nearest authorized Bendix Parts distributor If this is not possible the following should prove helpful DISASSEMBLY 1 Block the wheels and drain the air brake systems 2 Remove all air lines and the stop light switch from the manifold and remove the unit from the vehicle 3 Remove the four cap nuts items 10 11 12 and 13 from the body Identify the cap nuts to their respective ports before removing Remove the o ring 3 of item 7 and one of item 5 See Figure 4 4 Remove the double check guides 14 and double check shuttles 9 5 Reach into the port marked BLK SLS with a set of snap ring pliers and remove the snap ring 15 spring 16 and valve 2 6 Remove the two screws which hold the cover 18 to the body Remove the two small o rings 4 and one large o ring 3 Remove the quick release valve diaphragm 1 See Figure 3 7 Remove the 6 32 pan head screw 17 and remove the exhaust check valve diaphragm 8 CLEANING AND INSPECTION 1
5. er hand control valve application Cover the 1 16 inch vent hole in the service line shut off valve area of the Bendix TP 5 valve body Check for leakage at hose coupling and at exhaust port at the TP 5 valve Excessive leakage at either port indicates a faulty inlet valve item 2 on Figure 4 With the hand control valve still applied turn the ignition on and check for the stop light function Release the hand control valve application and place the tractor protection valve in the normal position Connect the tractor service hose coupling to a test gauge re apply the hand control valve and note that there is pressure at the service hose coupling Check for leakage at the service line quick release valve Excessive leakage would indicate a defective diaphragm 1 See Figure 3 11 10 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 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 rather than repaired Do not attempt repairs requiring machining or welding unless spec
6. ge Checks 4 BW1575 2011 Bendix Commercial Vehicle Systems LLC e 5 2011 All rights reserved
7. ifically 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 With the service line pressure still applied through the hand control valve check for leakage at the brake valve exhaust Excessive leakage indicates a defective double check valve shuttle Check for leakage at the 1 16 inch vent hole Leakage indicates either o ring 6 or o ring 5 on the service line shut off piston 19 is defective Note the same size o ring is identified as 5 is also used on cap nut 10 Release the hand control valve application and re check for leakage at the vent hole If the leakage continues the large o ring 5 is the cause for the leak and if the leakage stops the smaller o ring 6 is the cause of the leak Make and hold a foot brake application Check for leakage at exhaust of hand control valve Excessive leakage indicates a faulty double check valve shuttle 3 11 Release the foot brake application disconnect the line from primary service brake circuit at Bendix TP 5 valve delivery port PCD and block off the end of the line from
8. permitting faster release times for trailer brake release CAP RETAINING SPRING NUT RING 16 13 15 O RING SERVICE LINE SHUT OFF PISTON 19 FIGURE 4 BENDIX TP 5 TRACTOR PROTECTION VALVE SIDE SECTIONAL VIEW 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 TP 5 valve should be inspected every 6 months or 1500 operating hours whichever comes first for proper operation Should the TP 5 valve not meet the elements of the operational tests noted in this document further investigation and service of the valve may be required A maintenance kit is available under part number 289061 For the latest service parts and kits refer to the Bendix Quick Reference Catalog BW1114 available for order or download at www bendix com SERVICE CHECKS OPERATING AND LEAKAGE CHECKS 1 Charge the air brake system to governor cut out block the wheels and place tractor protection control valve in the emergency position GENERAL SAFETY GUIDELINES WARNING PLEASE READ AND FOLLOW THESE INSTRUCTIONS TO AVOID PERSONAL INJURY OR DEATH When
9. 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 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 used 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 5 Following the vehicle manufacturer s recommended procedures deactivate the electrical system in a manner that safely removes all electrical power from the vehicle Disconnect the trailer service line hose coupling Make a trail
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