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627333-A 8-11 Air Dryer AIR DRYER COMPONENTS FIG. 5: Air dryer assembly. (1) Heater (2) Turbo Cut-off Valve (3) Desiccant Cartridge (4) Outlet Check Valve (5) Regeneration Valve (6) Purge Valve Heater FIG. 6: Heater is located in air dryer base. Heater prevents water that collects in air dryer from freezing. The heater consists of a cylindrical resistive-type heating element and small circular thermostat. Heater is 12-volt. To replace heater, disconnect electrical plug. Remove screws, receptacle and O-ring from base to access retainer screw. Remove entire screw and remove entire heater assembly. Install new element and thermostat in cavities. Install new retainer and screw to hold element and thermostat in place. Install new O-ring and receptacle and fasten in place with screws. Turbo Cut-off Valve FIG. 7: Turbo cut-off valve is located in inlet port of air dryer. The turbo cut-off valve closes path between air compressor and air dryer purge valve during compressor unload. This prevents a loss of turbocharger boost pressure during a compressor unload cycle, keeping boost pressure for maximum engine horsepower. IMPORTANT: There is no spring in the turbo cut-off valve assemblies used on U Series air dryers. To replace turbo cut-off valve, remove snap ring. Cover and spring may fall out of bore. Remove desiccant cartridge. Use a wooden stick to push piston spring and cover out if they don’t fall out. Clean and inspect the valve bore. If bore is damaged so that a tight seal cannot be maintained, replace air dryer. Install new lip seal on piston. Seal lip must face up toward top of piston. Install new O-ring on cover. Use grease supplied with kit to apply thin film to valve bore and O-ring. Install new piston with flat side toward dryer. Install new spring, cover, and snap ring to hold components in place. Install plug. Replace desiccant cartridge. FIG. 5 M6205002 1 4 6 5 2 3 FIG. 6 M6215001 FIG. 7 M6215002 |