User manual BENDIX LQ-2 QUICK RELEASE VALVES

[. . . ] When the foot valve application is released, the air on the top and side areas of the piston is exhausted back through the foot valve; air pressure beneath the piston raises it, and the exhaust valve opens allowing the air in the delivery lines to exhaust out the exhaust port. SLIPPERY ROAD POSITION With the handle of the TW-1TM control valve in the "Slippery Road" position, the valve is in the "off" position; the inlet valve is seated and the exhaust is open. In this position air is not permitted to pass through the valve. When a foot brake application is made, air enters only the top inlet port. [. . . ] 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. 2 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 limiting, quick release, and TW-1TM valves should be inspected every 12 months or 3600 operating hours, whichever comes first, for proper operation. Should the limiting, quick release, and TW-1TM valves not meet the elements of the operational tests noted in this document, further investigation and service of the valve may be required. LIMITING & QUICK RELEASE VALVE Identify all lines to facilitate installation; disconnect lines and remove valve. Identify lines to facilitate installation. Remove valve. INSTALLING LIMITING AND QUICK RELEASE VALVE 1. Locate valve near front axle in close proximity to the chambers it serves. Install valve with exhaust port, pointing down. Use two mounting bolts and tighten securely. Connect brake chamber lines to delivery ports. Connect brake valve delivery line to top inlet port and line from control valve to side inlet port. Place valve handle through mounting hole. Connect air lines: (a) from brake valve to inlet port. (b) to limiting and quick release valve from delivery port. OPERATING AND LEAKAGE TESTS OPERATING TEST For this check, two accurate test gauges will be needed. Install one gauge in a brake chamber delivery line, and the other in the foot valve delivery line. Place the control valve in the "Dry Road" position and make a foot valve application. Readings on both gauges should be the same. Release the application and note that air is exhausted promptly from the exhaust port of the limiting and quick release valve. [. . . ] TW-1TM CONTROL VALVE Prior to assembly, lubricate body bores, plunger and o-rings with Dow Corning 55-M pneumatic grease (Bendix piece no. Install inlet/exhaust valve and spring in body. Install plunger o-ring, plunger spring and plunger into body. Position lever in body slot, line up lever hole and install pin. [. . . ]