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DESCRIPTION - TM-5-4210-230-14P-1_219
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TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
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Fig. 6.  Locking Hub (Manual Type with Hex Head Mounting Bolts) (Exploded View)
TRUCK SERVICE MANUAL TM 5-4210-230-14&P-1 AXLES-FRONT Fig. 5.  Three Stage Operation of Spring Loaded Manual Locking Hub A later version of the manual type locking chub is the spring- loaded    type,    Fig.    5,    which    is    designed    to    aid    in    the engagement  or  disengagement  of  the  front  wheels  with  the axles.  These hubs overcome the need of moving the vehicle slightly when the clutch ring does not mesh properly with the axle shaft hub. This   spring   in   these   new   hubs   permits   the   control   to   be positioned in the desired location, and the slight movement of the  vehicle  will  allow  the  clutch  ring  to  move  into  "LOCK"  or "FREE" position as selected on the control. Lock- O- Matic Type The   Lock-O-Matic   hub,   when   set   in   the   "FREE"   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. ). OPERATION Engaging Locking Hubs To  engage  locking  hubs,  turn  brass  controls  (one  on  each hub)  clockwise  to  "LOCK"  position,  Figs.  1  and  3.    Arrow  in center of controls must point directly at dot located on rim of hub.    You  can  feel  the  brass  control  "seat"  itself  when  it  is properly positioned.  If the arrow does not point directly at the dot,  the  control  will  not  seat  itself.    Thus,  the  gears  will  not completely engage, and the pressure may force off the end of the hub.  This is only true of hubs that are not spring loaded. Hubs that are spring loaded allow the control to be positioned in the engaged location, but engagement of the clutch ring on the axle shaft hub is not accomplished due to misalignment of components.    Then  when  the  vehicle  is  moved  slightly,  the spring-loaded clutch ring will engage with the axle shaft hub, Fig. 5 Right. Disengaging Locking Hubs To disengage locking hubs, turn brass controls counterclockwise  to  "FREE"  position,  Figs.  2  and  4.    Here, again,  the  arrow  must  point  directly  at  the  dot  on  the  rim, otherwise the gears may rake against each other. The hub on the left side in Fig. 5 illustrates the spring-loaded type locking hub in the "FREE" position. When  controls  are  properly  positioned,  gears  are  completely engaged or disengaged and units will not be damaged. The  following  CAUTION  hints  may  prevent  damage  to  the locking hubs: 1. Use fingers only to turn controls.  If control's do not move freely with your fingers, move vehicle slightly in either   direction   in   two-wheel   drive,   standard   gear range.      If   hubs   do   not   now   turn   freely,   look   for external  damage  or  dirt  around  brass  controls.    DO NOT force controls with tools. 2. DO  NOT  drive  vehicle  unless  controls  on  both  hubs are properly positioned and both are set the same. CTS-2209  Page 3 PRINTED IN UNITED STATES OF AMERICA

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