User manual BENDIX SL-5-DS-2 SWITCH AND CHECK VALVE

[. . . ] The snap action spring design minimizes arcing. The double check valve is activated by air being introduced through either of the two (2) inlet ports. The greater pressure pushes the shuttle along its guides and closes the opposite inlet port. [. . . ] 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 DS-2TM/SL-5TM valve should be inspected every 6 months or 1500 operating hours, whichever comes first, for proper operation and electrical connections. Should the DS-2TM/ SL-5TM 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 TEST 1. Install an accurate air gauge in the service line (or brake chamber). Stop lamps should light at 6 psi or less and go out after the brake application is released. This checks the electrical function of the stop light switch in either the SL-5TM switch or DS-2TM valve. (DS-2 valve only) Apply the foot valve and coat the exhaust port of the hand valve (or other alternate source). Reverse the above, applying the hand valve or other alternate source and coat the exhaust port of the foot valve. In either mode a leakage of not more than a 1" bubble in 5 seconds is permissible. (SL-5TM switch or DS-2TM valve) When pressurized, no leakage is permitted from the body of the valve or switch. If the SL-5TM switch or DS-2TM valve does not function as described above or if leakage is excessive, the valve or switch should be replaced with a new unit or in the case of the double check portion of the DS-2TM valve repaired with genuine Bendix parts. TM 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. [. . . ] 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. [. . . ]