User manual BENDIX MV-2 CONTROL MODULE

[. . . ] An auxiliary air delivery port is also available which receives its supply from the dual circuit supply valve. All air connections are at the bottom of the valve, as shown on Figure 3, including the auxiliary air delivery port. SB-3 EXHAUST DELIVERY - TRACTOR AUXILIARY AIR DELIVERY RESERVOIR #2 TP-3 TM TRACTOR PROTECTION VALVE DELIVERY - TRAILER RESERVOIR #2 SUPPLY RESERVOIR #1 SUPPLY PORT DESIGNATIONS MV-2TM CONTROL MODULE RESERVOIR #1 FIGURE 3 1 SD-03-3412 8 6 The trailer air supply valve (red button) (see Figure 1) delivers air to the trailer supply line and also will trip (Pop out) automatically and shut off the trailer supply if pressure decreases to 40 ±5 P. S. I. 1 must be the reservoir that supplies the rear tractor axle(s). 2 must be the reservoir that supplies the front axle. [. . . ] 1 reservoir pressure should descend together to 105-90 P. S. I. at which point the dual circuit supply valve shuttle should switch to No. 2 reservoir and delivery pressure should increase to No. 1 reservoir pressure is reduced to zero, there should not be audible leakage at the No. Close the leak which had been created in the No. Leaving the yellow button in, recharge the No. The delivery pressure should also read 120 P. S. I. 2 reservoir pressure and the delivery line pressure descend, pressure should stabilize at approx. Close all vents or leakage points and charge both reservoirs to 120 P. S. I. Position the red button out and the yellow button in. Develop a leak in the spring brake delivery line and hold the yellow button in. 1 reservoir pressure must reduce to zero and No. The dual circuit supply valve shuttle should cycle several times during this leakdown period. REMOVING AND REPLACING SPOOL ASSEMBLIES Block the wheels or otherwise secure the vehicle and drain all reservoirs. It should be unnecessary to remove the MV-2TM module from the vehicle. Remove any panel, plate or whatever is necessary to expose the valve cover plates. It is recommended that the valve be serviced by replacing the complete spool assemblies. The dual circuit supply valve feature may be serviced by replacing four (4) o-rings and one (1) spring, available in a maintenance kit. Carefully pull the spool assemblies out of their respective body bores by pulling on the buttons. Remove the roll pins (2) which retain the buttons on the spool stems and remove buttons and cover plates. 3 EXHAUST SUPPLY TO TRAILER TRACTOR SPRING BRAKE CONTROL QRV SERVICE RESERVOIR #1 SERVICE RESERVOIR #2 SB-3 FIGURE 6 NORMAL OPERATING POSITION MV-2 TM CONTROL MODULE EXHAUST SUPPLY TO TRAILER TP-3 TM TRACTOR PROTECTION VALVE TRACTOR SPRING BRAKE CONTROL QRV SERVICE RESERVOIR #1 SERVICE RESERVOIR #2 SB-3 FIGURE 7 OPERATING & LEAKAGE TEST 1. Charge the air brake system to 65 P. S. I. and check for leakage between body seals, body and cover plates. [. . . ] 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. [. . . ]