User manual BENDIX PRESSURE PROTECTION VALVES

[. . . ] Opening pressures of the valves are higher than closing pressures. The pressure ranges are noted below: PR-2TM valve Opening pressure 15-20 psi higher than closing pressure. PR-3TM & PR-4TM valves Opening pressure approx. PR-3TM valve Check valve will retain maximum pressure in downstream reservoir. [. . . ] PR-3TM valve - No leakage is permissible at the bottom of the valve. Drain the air pressure from the delivery side of the pressure protection valve and disconnect the air line to it. Apply a soap solution to the delivery port. A 1" bubble in 5 seconds or more is acceptable. GENERAL If the pressure protection valve does not function as described, or leakage is excessive, it is recommended that it be replaced with a new or remanufactured unit or repaired with genuine Bendix parts available at Bendix outlets. 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 PR valves should be inspected every 6 months or 1500 operating hours, whichever comes first, for proper operation. Should the PR valves not meet the elements of the operational tests noted in this document, further investigation and service of the valve may be required. REMOVING AND INSTALLING REMOVING 1. Block or hold the vehicle by means other than air brakes. Disconnect and identify (supply and delivery) the air lines leading to and from the pressure protection valve. Remove the mounting bolts, if any, that secure the valve. Re-install the mounting bolts and secure the replacement valve to the vehicle. Reconnect the supply delivery air lines to the proper ports of the replacement valve. OPERATING AND LEAKAGE CHECKS OPERATING CHECKS 1. Provide a pressure gauge and drain valve at the supply side and delivery side of the pressure protection valve being checked. Charge the air system to full pressure and shut off the engine. 2 GENERAL After installing a replacement valve, it is recommended that the operating and leakage checks be performed as outlined in this manual. If the closing pressure does not conform to that shown on the valve label or in the vehicle or a different setting is desired, the PR-2TM valve may be adjusted by loosening the locknut and tightening or loosening the adjusting cap as required; however, if the proper setting cannot be attained by moderate adjustment of the cap, the valve may have the wrong spring and will have to be exchanged for the correct valve. The PR-3TM and PR-4TM valves are not adjustable. 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. [. . . ] Prior to returning the vehicle to service, make certain all components and systems are restored to their proper operating condition. 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. 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. Park the vehicle on a level surface, apply the parking brakes, and always block the wheels. [. . . ]