The leveling apparatus is mounted between an upper swing structure and a lower frame formed on a lower driving structure including a swing bearing, left and right track chassis, and a front arm and a rear arm connected to {HEAD ~ upper parts} of {TAIL ~ the track chassis} 
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The leveling apparatus is mounted between an upper swing structure and a lower frame formed on a lower driving structure including a swing bearing , left and right track chassis , and a front arm and a rear arm connected to { HEAD ~ upper parts } of { TAIL ~ the track chassis }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL