BENDIX BW1442 User's Manual
Contents
1. procedures deactivate the electrical system in a manner that safely removes all electrical power from the vehicle 6 Never exceed manufacturer s recommended pressures 7 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 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 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 REMOVING AND INSTALLING REMOVING Block vehicle wheels and or hold vehicle by means other than air brakes Drain all air brake system reservoirs Disconnect air lines from valve Remove mounting bolts then valve INSTALLING ASSEM2. the diaphragm will seal against the body seat The exhaust port is still sealed by the center portion of the diaphragm when the supply air is released the air pressure above the diaphragm is released back through the brake valve exhaust air pressure beneath the diaphragm forces the diaphragm to rise opening the exhaust allowing delivery air to exhaust 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 QR 1 valve should be inspected every 12 months or 3600 operating hours whichever comes first for proper operation Should the QR 1 valve not meet the elements of the operational tests noted in this document further investigation and service of the valve may be required OPERATING AND LEAKAGE TESTS While holding a foot brake valve application 1 Coat the exhaust port with a soap solution leakage ofa 1 bubble in 3 seconds is permitted 2 Coatthe body and cover with a soap solution No leakage is permitted between body and cover If the valve does not function as described or if leakage is excessive it is recommended that it be replaced wit
3. BLY Mount the valve with exhaust port pointing down securely QRV VALVE tighten mounting bolts 1 Position the spring seat over the diaphragm and then install Connect the air lines to valve brake valve application line to it into body top port brake chamber line to side ports 2 Install the spring and cover o ring 3 Install the cover tighten securely Torque to 150 400 inch pounds DISASSEMBLY QRV VALVE QR 1 VALVE 1 Ifthe valve is equipped within spring and spring seat a Position the spring in body b Position the diaphragm over spring seat c Install the o ring in the cover groove install the cover and tighten the screws evenly and securely Torque to 30 60 inch pounds QR 1 VALVE 2 Ifthe valve is not equipped with spring and spring seat a Install the diaphragm b Install the o ring in the cover groove install the cover 1 Using awrench on square portion of exhaust port remove the cover 2 Remove the spring spring seat and diaphragm Remove the cover o ring 1 Remove the four screws ef MEMO HSE OTN and sping seat iSO rapes and tighten theh screws evenly and securely Torque 3 Remove the diaphragm to 30 60 inch pounds 4 Remove the cover o ring 3 Perform tests as outlined in Operating and Leakage Tests section CLEANING AND INSPECTION Clean all metal parts in mineral spirits Wipe all rubber parts clean lt is recommended that all rubber parts and any other part sh
4. Spring QRV Quick Release Valve FIGURE 1 DESCRIPTION The function of the quick release valve is to speed up the exhaust of air from the air chambers It is mounted close to the chambers it serves In its standard configuration the valve is designed to deliver within 1 psi of control pressure to the controlled device however for special applications the valve is available with greater differential or zero hysteresis QR 1 valves also come with optional noise reducing foam crosses or silencers Reference Figure 1 two styles of quick release valves are available and are functionally the same the QRV valve which is of older design and utilizes a spring and spring seat and the QR 1 valve which in its standard configura tion does not employ a spring or spring seat Note QR 1 valves with a pressure differential employ a spring and spring seat Porting consists of one supply port two delivery ports and one exhaust port x V T Q 7 Delivery Port Delivery l i per Port QR 1 Quick Release Valve OPERATION When a brake application is made air pressure enters the supply port the diaphragm moves down sealing the exhaust At the same time air pressure forces the edges of the diaphragm down and air flows out the delivery ports When air pressure being delivered beneath the diaphragm equals the pressure being delivered by the brake valve above the diaphragm the outer edge of
5. h a new or remanufactured unit or repaired with genuine Bendix parts 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 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 Ifthe 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 an AD IS air dryer system or a dryer reservoir module be sure to drain the purge reservoir 5 Following the vehicle manufacturer s recommended
6. owing signs of wear or deterioration be replaced with genuine Bendix parts BW1442 2006 Bendix Commercial Vehicle Systems LLC All rights reserved 7 2006 Printed in U S A
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