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Fan Assembly
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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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Fan Pulley Replacement.
TM 5-4210-220-12 4-20.  RADIATOR AND COOLING SYSTEM - Continued b. Fan Clutch Replacement. (1) Carry out steps 1 thru 4 in a. preceding. (2) Loosen fan pulley support block capscrews. (3) Loosen  belt  adjusting  screw  on  top  of  fan  pulley support block until fan belts can be removed from crankshaft pulley (4) Remove  fan  belts  from  both  pulleys.    Slip  them over   the   fan   clutch   and   remove   from   engine compartment. (5) While   supporting   clutch   and   pulley   assembly, remove   capscrews   retaining   fan   pulley   support block to engine   (6)    Lower  fan  pulley  support  block  and  remove  from truck via left hand engine compartment. (7) Install fan pulley assembly in a vise.  Connect an air line to the fan clutch and charge clutch to 100 psi (690 kPa). (8) Rotate  fan  clutch  until  the  machine  screws  attaching  fan  clutch  to  fan  pulley  are  visible.    Remove  air supply (9)    Remove  machine  screws  attaching  clutch  to  pulley.    Remove  clutch  but  retain  spacer  between  clutch and pulley. (10) Install new fan clutch on pulley ensuring spacer is fitted between pulley and clutch.  If necessary connect air line to clutch assembly to allow alinement of screw heads with holes in clutch hub. (11) Attach using machine screws removed above.  Tighten screws to 75 ft lb (100 Nm) (12).  Install fan assembly in truck against engine support bracket.  Install four retaining capscrews fingertight. (13) Slip fan belts over fan clutch pulley and crankshaft pulley. (14) Tighten adjusting screw until there is 1/2 in. (1.2 cm) play in fan belt midway between the pulleys. (15) Tighten support bracket retaining capscrews to 75 ft lb (100 Nm). (16) Install fan on fan clutch and tighten nuts to 75 ft lb (100 Nm). (17) Coat threads of elbow with pipe sealant (item 22, Appendix E) and install in fan clutch.  Reconnect air line to clutch. 4-327

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