User manual BENDIX LQ-5 BOBTAIL RATIO VALVE

[. . . ] The LQ-5TM valve control port must be connected to the trailer supply line. When the tractor is disconnected from the trailer, bobtail tractor braking performance is improved because full brake valve pressure will be applied to the steering axle brakes. Although it is not mandatory, the LQ-5TM valve is used in conjunction with the BP-R1TM bobtail brake proportioning relay valve, only when a customer specifies a front axle ratio valve. The BP-R1TM valve and LQ-5TM valve combine to reduce stopping distance and improve tractor control in bobtail mode. [. . . ] Experience is a valuable guide in determining the best maintenance interval for air brake system components. At a minimum, the valve should be inspected every 6 months or 1500 operating hours, whichever comes first, for proper operation. Should the valve not meet the elements of the operational tests noted in this document, further investigation and service of the valve may be required. 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. Park the vehicle on a level surface, apply the parking brakes, and always block the wheels. 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. 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 an AD-ISTM 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. 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. 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. Prior to returning the vehicle to service, make certain all components and systems are restored to their proper operating condition. OPERATION & LEAKAGE TESTS OPERATION TEST To properly test the LQ-5TM valve, use a pair of test gauges or gauges of known accuracy. [. . . ] Mount LQ-5TM valve on the vehicle and perform Operation and Leakage Tests before returning the vehicle to service. ASSEMBLY 1. Before assembly, lubricate o-rings, pistons, and body and cover bores with the lubricant in the Bendix maintenance kit. Install o-rings (3 & 4) on proportioning piston. Install o-rings (2 & 4) on blend back piston. [. . . ]