SERVICE MANUAL8.Wash all remaining parts in a commercialsolvent making sure all surfaces, bores, portsand passages are clean and dry beforereassembly.The heater and thermostat assembly in the AD-2end cover are non-serviceable. Donotremovethethermostatcover.Should this assemblybecome defective, the end cover must bereplaced.Fig. 18 AD-2 End Cover Assembly withPurge Valve Assembly RemovedFig. 19 Purge Valve Assembly DisassembledReassembly1.Lubricate the piston O-ring and install it on thepiston.2.Lubricate the piston bore and install the piston.3.Install the purge piston return spring andpiston.4.Install the purge valve in the large cap nut sothat the rubber portion rests on the metal seat ofthe cap nut.5.Secure the valve to the piston using the 1/4"-20capscrew and lockwasher and torque to 5.5 N.m(50 in. lbs.).6.Lubricate and install the two cap nut 0- rings.7.Lubricate the cap nut threads and the cap nutbore of the end cover and install the cap nut;torque it to 19.8-27.5 N.m (180- 250 in. lbs.).8.Secure the exhaust diaphragm to the exhaustcover using the No. 6-32 phillips head screw anddiaphragm washer.9.Secure the exhaustcover to the purge valve hexhead cap nut using the No. 6-32 phillips headscrews.10.Lubricate and install the large diameter 0- ringaround the end cover assembly.OUTLET PORT CHECK VALVE ON AD-2The one-way check valve located in the outlet port ofthe AD-2 dryer assembly is replaced as a completeassembly. The removal and installation procedure is asfollows (Refer to Fig.20).1.Set parking brake by applying the control valve.Fig. 20 Typical Air Dryer Installation1Check Valve Assy.2Supply to Air Reservoir3Pressure Relief Valve4Governor Control Line5Air Source From Compressor6Air Dryer AssemblyCTS - 4079 - CHAPTER XIV - Page 11
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