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Track  Frame
Attachments - 14081_273

Equipment Operator Basic - Beginning construction equipment operators manual
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Figure  11-8.-Carrier  rollers. The carrier rollers are mounted on brackets that extend above the track frame (fig. 11-8). Two of these rollers are on each side of the dozer. The single flange on the rollers extends upward between the links of the track chain and keeps the chain in alignment between the drive sprocket and the front idler. The track rollers support the weight of the dozer and ensure the track chain is in alignment with the truck frame, as it passes under the rollers (fig. 11-9). Track rollers, both single and double flanged, are installed Figure 11-9.—Track rollers in position in track frame. alternately.  In  the  normal  arrangement,  a  double-flanged roller is positioned directly in front of the rear drive sprocket, followed by a single-flanged roller. The rollers alternate forward to the front idler. FRONT IDLER.— The front idler, as shown in figure  11-9,  serves  as  a  guiding  support  for  the  track chain. The idler is spring-loaded and mounted on slides, or guides, that allow it to move back and forth inside the track frame, as the dozer passes over uneven ground. The spring-loading effect causes the idler to maintain the  desired  tension  regardless  of  operating  conditions. RECOIL SPRING.— The recoil spring is a large coil spring placed in the track frame in a way that enables the spring to absorb shock from the front idler. The spring is compressed before installation and held in place  by  stops  or  spacers.  The  track  adjusting mechanism,  by  pressing  against  the  spring  stop, maintains the desired tension on the track assembly by holding the idler and yoke in the forward position. The operation of the coil spring depends on the amount of tension on the truck. TRACK  ADJUSTING  MECHANISM.—  The adjusting  mechanism  must  be  extended  enough  to remove  slack  between  the  front  idler  and  spring.  The adjustment is made either manually (fig. 11-10) or hydraulically (fig. 11-11). Older model dozers have mnaually  adjustments;  whereas,  newer  dozers  are 11-4







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