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REPAIR - TM-5-4210-220-12_690
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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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Differential Lock Air Shift Unit Repair (CONT) - TM-5-4210-220-12_692
TM 5-4210-220-12 4-30.  REAR AXLE - Continued b. Differential Lock Air Shift Unit Repair NOTE Air shift unit removed from truck NOTE Replacement of gasket (4) or O-ring (5)  may  be  done  without  removing air shift unit from truck.  Whenever the   air   shift   unit   is   disassembled for repair, all O-rings and piston felt oilers should be replaced. (1) Remove   capscrews   (1),   lockwashers   (2), cover   (3),   and   gasket   (4)   from   shift   unit housing (6).  Drain housing. (2) Remove  locknuts  (10),  capscrews  (9),  top cover   (11),   and      O-ring      (12).      Discard locknuts and O-ring. WARNING During the following procedure the piston    (13)    will    pop    out    of    the housing by action of the spring (14) when   nut   (15)   is   removed.      Take precautions    to    prevent    injury    to your hands and face. (3)    Remove locknut (15), flat washer (16), and piston  (13)  from  push  rod  (17).    Remove and  discard  O-rings  (18  and  19),  and  felt oilers (20). (4) Remove     compression     spring     (14)     and piston stop (21). (5) Remove clevis pin (7) and push rod (17) (6) Remove actuating lever and pivot pin assembly (8). Do not disassemble actuating lever. (7)  Inspect housing (6) for damage and defects.  Replace complete air shift unit if excessive wear or damage, including deep scoring of piston bore, is  noticed. (8) Inspect actuating lever and pin (8) for wear and deterioration.  Replace both parts if  either are defective. NOTE If  replacement  of  actuating  lever  and  pin  (8)  as  well  as  bushings  (22)  is  required,  replace complete air shift unit. 4-579

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