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LOCKING TYPE DIFFERENTIAL CONTENTS
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Driven Clutch Members
TRUCK SERVICE MANUAL TM 5-4210-230-14&P-1 Fig. 34  Internal Spring Design differential Locking Unit (Exploded View) DESCRIPTION The   NoSPIN   differential   (Figs.      34   and   35) provides equal amounts of drive line torque to each rear driving   wheel   and   also   permits   differential   action   for turning corners. This differential also provides greater operating flexibility  than  a  conventional  differential,  because  the locking type differential overcomes wheel spinning when required  to  operate  in  mud,  sand,  snow  and  on  ice  or wet roads.  The unit is installed in the differential case in place of the conventional gears, pinion and spider. The action  of  the  unit  is  the  same  for  both  drive  and  coast loads and forward and reverse driving. CONSTRUCTION Two  types  of  NoSPIN  differentials  have  been used on IH vehicles; they are (a) Internal Spring Design, Fig.  34, and (b) External Spring Design, Fig.  35. The  difference  in  the  two  units  is  explained  in the    text;    however,    the    disassembly    will    cover    the internal design locking unit. The  differential  locking  unit  consists  of  several parts, all assembled around the spider. Spider and Center Cam Assembly This assembly consists of the spider, center cam and spider snap ring.  The spider has four trunnions projecting radially from a center ring on each side of which are located fixed driving clutch teeth.  These teeth vary in number, depending on the size and model of differential.  The internal diameter of the spider is uniform.  Into it is mounted the center cam.  This cam is held in position with a centrally mounted snap ring, which permits the center cam to be rotated within the spider but prevents lateral movement.  The center cam is symmetric, having the same number of cam lifts on each side as there are clutch teeth on the spider.  These lifts or "cams" have uniform contours with rounded surfaces that provide anti-friction ramps for disengaging the driven clutch members. Fig. 35.  External Spring Design Differential Locking Unit (Exploded View) CTS-2095S - Chapter II - Page 2 PRINTED IN UNITED STATES OF AMERICA

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