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TM 5-4210-220-12 4-20.  RADIATOR AND COOLING SYSTEM  - Continued 4-20.2  Fan Assembly This task covers Replacement TOOLS MATERIALS/PARTS Tool Kit, General Mechanic, Automotive, 16, Appendix E Grease NSN 5180-00-177-7033 4035-37494-07 Fan 1090-06060-02 Fan Clutch EQUIPMENT CONDITION 1077-05827-02 Fan Hub Main Engine Shutdown (see para. 2-10) APU Shutdown (see para. 4-12) Batteries Disconnected (see para. 4-24) Engine Compartment Covers Removed (see para 4-12.11) Truck Wheels Blocked All Air Tanks Drained REPLACEMENT a. Fan Replacement. (1) Disconnect air line from fan clutch piston. (2) Remove nut from end of fan clutch (1) and remove fan clutch piston. (3) Remove nuts (2) and lockwashers (3) retaining fan to fan hub.  Fan clutch is locked on because no power is on truck.  However, fan will still slip so hold blades when loosening nuts. (4) Remove fan (4) and rest against radiator. (5) Remove    fan    clutch    and    pulley    assembly    as detailed in b. following, steps 2 thru 6. (6) Remove  fan  through  space  between  engine  and radiator shroud. (7) Place   new   fan   against   radiator,   install   through space between engine and radiator shroud. (8) Install fan clutch and pulley assembly as detailed in b following, steps 12 thru 17. (9) Place new fan over fan clutch and tighten nuts to 75 ft lb (100 Nm). (10) Install   fan   clutch   piston   and   secure   with   nut. Reconnect air line to clutch. (11) Rotate fan by hand to test clearance between fan and shroud.  To disengage fan clutch, set fan switch to AUTO.  Fan clearance should be at least 1 in. (2.5 cm). 4-326

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