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Figure 9-51 .Digging With the backhoe.
Figure 9-54.-Truck carrier-mounted multipurpose excavator.

Equipment Operator Basic - Beginning construction equipment operators manual
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Figure  9-52.—Backhoe  bucket  adjustment  digging  positions. The digging trucks is Figure  9-53.—Track-mounted  excavator. backhoe  bucket  can  be  adjusted  for  two positions.  The  position  for  loading  dump shown in figure 9-52, view A. The position for digging deep, vertical holes is shown in figure 9-52, view B. The backhoe can dig more material in less time when a smooth, short dig cycle is used. When the bucket is forced to excavate a load that is too large (when the dipper stick control lever is pulled back and the bucket is not moving), a “hydraulic stall” results in the loader hydraulic system. When this occurs, the main relief valve of the hydraulic system makes a noise, alerting the operator to release the control lever. NOTE: Hydraulic  stalls  cause  the  temperature  of the hydraulic fluid to increase that can cause premature wear to the hydraulic system. EXCAVATORS Excavators are large backhoes used for heavier construction  tasting.  The  types  used  in  the  NCF are  either  track  mounted  (fig.  9-53),  truck  carrier 9-21







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