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Fig. 1.  Locking Hub (Automatic)
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TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
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AXLES - FRONT CHAPTER II MANUAL HUB
TRUCK SERVICE MANUAL TM 5-4210-230-14&P-1 AXLE-FRONT OPERATION The    automatic    hub,    when    set    in    the    "AUTO"    position, automatically locks the front wheel and axle shaft together the moment torque is applied to the front axle.  The hub controls, therefore,  do  not  require  changing  regardless  of  whether  the vehicle  is  being  operated  in  two  or  four-wheel  drive.    It  is necessary, however, to set the control in the "LOCK" position when engine braking control is required (down steep hills, on ice, etc.). Fig. 2.  Dial Control DO NOT DRIVE unless controls on both hubs are set properly and both are set the same! For the first 320 km (200 miles) operate your new vehicle with the   automatic   hubs   in   "LOCK"   position   to   assist   in   initial break-in of the front driving axle.  Place transfer case control in 2-wheel drive position. Always   shift   transfer   case   to   2WH   before   attempting   to disengage the locking hubs. This  will  help  to  eliminate  drive  line  wrap  up  which  results from 4W drive operation.  Also, this will allow automatic hub to disengage by rotating the control dial. IMPORTANT Torque  wind  up  may  be  relieved  by  turning hard   right   or   left   and   backing   up   a   short distance while pushing the transfer case lever into 2WD. LUBRICATION When reassembling the locking hub, lubricate as follows: Lubricate dial, seals, splines, threads, rollers, cage, centering spring and body with IH 251 HEP grease. Fill area between and around friction shoes with approximately   two   tablespoons   of   grease.      All   remaining surfaces  require  only  a  light  coating.    Excessive  grease  can create malfunction of hub. SERVICING This locking hub is serviced in two major assemblies, namely, a  clutch  half  and  body  half.  Since  all  individual  components are   not   provided,   refer   to   the   Scout   Parts   Catalog   when ordering. To disassemble: 1. Bend lock tabs out of way. 2. Remove six (6) bolts. 3. Remove cap assy. 4. Remove snap ring from axle shaft. 5. Remove body assy. To reassemble: 1. Clean gasket surface. 2. Reverse   disassembly   procedure   using   new   gasket and lock tabs. TORQUE SPECIFICATION Torque hub assembly mounting bolts to 32-40 ft. Ibs. 43-54 N-m. CTS-2785 CHAPTER I  Page 3 PRINTED IN UNITED STATES OF AMERICA

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