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Page Title: Balance Wheel Adjusting Screw
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Needlebar Rock Frame Hinge Stud
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Needlebar Rock Frame Rockshaft

to   the   vertical   motion   of   the   needlebar.   Remove the   needlebar   connecting   link   by   grasping   it   and then   withdrawing   it   from   the   face   of   the   machine. Balance   Wheel   Adjusting   Screw The  balance- wheel   adjusting   screw   (figure   4-11 [L])   eliminates   end   play   in   the   balance   wheel   and arm   shaft.   Remove   the   balance   wheel   adjustment screw. Balance  Wheel The   balance   wheel   (figures   4-6   [R]   and   4-11 [N])   transfers   the   motion   and   power   from   the   one- third-horsepower   electric   motor   to   the   arm   shaft. To   remove   the   balance   wheel,   you   must   first loosen   the   two   setscrews   attaching   it   to   the   arm shaft;   then   you   withdraw   it   from   the   machine. NOTE:   The   balance   wheel   is   very   fragile.   Do not   hit   it   with   a   hammer   to   remove   it. Arm   Shaft   Connection   Belt The   arm   shaft   connection   belt   (figure   4-4   [A]) transfers   the   power   and   motion   from   the   arm shaft  connection  belt  pulley  to  the  safety  clutch pulley.   To   remove   the   arm   shaft   connection   belt, you  insert  a  small  screwdriver  along  the  left  edge and   slide   the   belt   from   the   safety   clutch   pulley. Arm   Shaft   Connection   Belt Pulley  Position  Screw The   arm   shaft   connection   belt   pulley   position screw  holds  the  pulley  in  a  freed  position.  The  arm shaft   connection   belt   pulley   position   screw   is   the larger  of  the  two  screws  on  the  pulley.  The  smaller screw   is   a   setscrew.   It   must   be   loosened   but   not removed   from   the   pulley.   Remove   the   arm   shaft connection   belt   pulley   position   screw   by   unscrew- ing   it. NOTE:   For   machines   with   ball   bearings,   the arm   shaft   arm   bushing   setscrews   are   located   just to   the   right   of   the   connection   belt   pulley.   They secure   the   arm   shaft   bushing   to   the   arm   shaft. These   screws   are   not   removed   from   the   bushing; however,  they  must  be  loosened  for  the  arm  shaft to   be   removed. The   Presser-Lifting   Eccentric The   presser-lifting   eccentric   supplies   the lift   for   the   alternating   presser   feet.   Free   the presser-lifting   eccentric   by   loosening   the   two presser-lifting   eccentric   setscrews   located   through the   opening   in   the   rear   of   the   arm   (figure   4-11 [A]).   You   must   rotate   the   balance   wheel   to   loosen the   second   screw.   Be   sure   the   eccentric   rotates freely   on   the   shaft. Feed   Indicator   Disc The  feed  indicator  disc  shows  the  operator  the number   of   stitches   per   inch   the   machine   is sewing.   It   also   allows   the   operator   to   set   the machine   to   sew   a   desired   number   of   stitches   per inch.   Loosen   the   feed   indicator   disc   setscrew   and ensure   the   disc   will   rotate   freely   on   the   shaft. Needlebar   Crank The   needlebar   crank   transfers   the   motion   and power  from  the  arm  shaft  to  the  needlebar  by  the needlebar   driving   stud.   Do   not   remove   the needlebar   crank   from   the   arm   shaft. Needlebar   Connecting   Link   Stud The   needlebar   connecting   link   stud   transfers the   motion   and   power   from   the   needlebar   crank to   the   needlebar   connecting   link.   Do   not   remove the   needlebar   connecting   link   stud   from   the   arm shaft. Needlebar   Crank   Friction   Washer The   needlebar   crank   friction   washer   acts   as a   bearing   surface   between   the   needlebar   crank   and the   front   arm   shaft   bushing.   In   some   cases   the needlebar   crank   friction   washer   remains   with   the machine   upon   removal   of   the   arm   shaft   bushing. If   this   occurs,   insert   the   index   finger   in   the   arm shaft   recess   and   remove   the   washer. NOTE:   The   operator   must   be   especially careful   when   assembling   the   machine   to   be certain   the   needlebar   crank   friction   washer   is r e t u r n e d    t o    t h e    a r m    s h a f t .    A b s e n c e    o f    t he needlebar   crank   friction   washer   will   cause   the machine   to   bind. Arm   Shaft The   arm   shaft   (figure   4-11   [0])   acts   as   a carrier   for,   and   transfers   the   power   and   motion to,   the   arm   shaft   connection   belt   pulley,   the   feed indicator   disc,   the   needlebar   crank   friction washer, and the needlebar crank. To remove 4 - 24

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