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Hadley SAMS Owner's Service Manual
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When it becomes necessary to either raise or lower the vehicle ride height, the ECU will energize therespective manifold valve coil(s) by applying 12VDC. With 12VDC applied to the coil, current flowsthrough the windings and creates an electro-magnetic field. This magnetic field is stronger than theexisting spring pressure that holds the valve plunger against the valve seat within the manifold. Thestrength of the magnetic field will cause the plunger to move inside the body of the valve assembly,compressing the spring, and opens the respective “fill” or “exhaust” passage within the manifold. Thiswill allow system air to either “fill” or “exhaust” the associated airbag. This action will either raise orlower the vehicle, depending upon which valve has been energized. When the desired position has beenreached, the ECU will remove power from the valve coil(s), the internal spring will decompress (expand),and the plunger will once again seal off the associated manifold port. This sealing action will sustain thedesired ride height until system adjustment once again becomes necessary.Valve ServicingThe valves are secured to the body of the manifold by using four (4), 10-32NF X ½” socket head capscrews (SHCS) with lock washers and are factory tightened to 30in/lbs. of torque. Care must be takenwhen removing or replacing the valve assembly so as not to lose the mounting hardware or the O-ring thatis installed in the respective manifold surface machined groove. The O-ring and mounting hardwarecreate a positive seal between the valve assembly mounting plate and the valve mounting surface of themanifold.Note: If the O-ring is lost or damaged or the valve is not properly attached to the manifold by using all ofthe previous mentioned hardware, an external leak will occur and a source for contamination to enter themanifold is created.The valve body and coil are independent assemblies and can be replaced individually, if necessary. Thecoil only can be replaced by the following procedure:1.) Disconnect the associated valve wiring harness.2.) Remove the power wire from the harness connector and remove the ground wire SHCS.3.) Insert an appropriately sized flat head screwdriver into the hook section of the clip groove locatedon the top of the valve assembly.4.) Tilt the screwdriver handle down, so the clip slides out (towards the screwdriver).5.) Remove the clip and slide the coil upward, to clear the housing of the valve body.6.) To reinstall, slide the coil over the valve body and reinstall the clip.7.) Install and crimp a new pin/connector on the coil wires.8.) Reinstall the wire in the harness connector, reattach the ground wire, and reconnect the wireharness connector.Warning : System operating pressures are typically 90-130psi. Steps should be taken torelieve pressure from the system prior to removing any valve assembly from the manifold. |
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