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Chapter 11 Dozers and Rollers
Track  Frame

Equipment Operator Basic - Beginning construction equipment operators manual
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Figure 1-2.-Side view of crawler tractor chassis. Dozers can move from jobsite to jobsite under their own  power  at  slow  speeds;  however,  this  is  a  poor practice and tends to shorten the operational life of the dozer. For this reason, dozers should be transported by tractor-trailer  from  jobsite  to  jobsite. TRACKS AND TRACK FRAME The undercarriage of the crtiwlcr-mounted dozer contains two major components:  track assembly and track  frame.  The  undercarriage  (fig.  11-2)  shows positive traction, allowing efficient operations. Track  Assembly The track assembly consists of a continuous chain surrounding the track frame and drive  sprocket. The links of the chain provide a flat surface for the track rollers  to  pass  over,  as  they  support  the  equipment.  Track shoes  are  bolted  to  the  outside  of  the  chain  links  and distribute the weight of the equipment over a large surface. The distribution of the weight is the ground bearing  pressure. TRACK CHAIN.— Figure 11-3 shows a cutaway view  of  a  section  of  track  chain,  showing  the  internal arrangement of the pins and bushings. As the dozer operates, the drive sprocket teeth contact the track pin bushings and propel the dozer along the track assembly. The pins and bushings wear much faster than other parts of the track because of their constant pivoting, as the track rotates around the track frame. The pivoting results in internal wear of both pins and bushings. As the pins  and  bushings  wear,  the  track  lengthens.  When  it does, the track should be adjusted to remove any slack. 11-2 Extensive wear on the outside of bushings is a good indication  of  inner  wear.  Manufacturers  have  set specifications for  the maximum wear allowed before a track has to be rebuilt. To determine if a track should be removed for rebuilding or replacement, measure the outside of the bushings and track pitch (length of the track). Measure the outside of the bushing at the location at which it shows the most wear using a caliper and ruler, as shown in figure 11-4. Compare this measurement with the manufacturers’ specifications. Measure the Figure 11-3.—Track  chain.







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