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Thermostat and Heater Repair
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TM-5-4210-220-12 Truck Firefighting: Powered Pumper: Foam and Water 500-GPM Capacity; Centrifugal Pump Power Takeoff Driven Manual
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repair (cont) - TM-5-4210-220-12_513
TM 5-4210-220-12 4-22.  AIR SYSTEM - Continued 4-22.12  Air Drier - Continued f. Desiccant Filter Repair NOTE This   task   consists   of   replacing the desiccant in the air drier. This  task  may  be  accomplished  with  the drier on the truck. Ensure    air    tanks    are    drained    prior    to repair. (1) Remove   end   cover   as   detailed   in   End Cover Repair, steps 1 thru 5, preceding. (2) Remove     the     cartridge     and     desiccant sealing plate assembly by unscrewing the hex bolt seen inside the main shell of the drier. (3) Remove     locknut     (1)     from     assembly, assembly is spring loaded. Hold assembly   firmly   while   removing   nut   the last few turns. (4) Lift off the desiccant plate assembly (7). (5) Remove the two O-rings (2 and 8) from the desiccant plate (7) and discard them. (6) Remove the ball check valve retaining clip (5) and remove and discard the rubber ball valve (6). (7) Clean the desiccant plate thoroughly.  Be sure the purge orifice and check valve seat are clean. (8) Install a new ball check valve (6) and replace the retaining clip (5), screw (3), and washer (4). (9) Lubricate the two new O-rings (2 and 8) with petroleum jelly (item 21, Appendix E) and install them in their respective grooves in the desiccant plate (7). (10) Remove the spring (10), spring seat (9), bolt (15), and cartridge shell (12).  Discard the oil separator filter (13), the two perforated plates (11), and desiccant material. (11) Insert a new perforated plate into the cartridge, cloth side up, and tap it firmly to the bottom (Cloth always faces desiccant material). (12) Slide washer (14) and oil separator filter (13) over the cartridge bolt with the gasket surface next to the shell (12). (13) Install  the  bolt  with  the  oil  separator  into  the  bottom  of  the  shell  (12)  and  through  center  hole  of  the perforated plate in the bottom of the shell. 4-386

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