How many bearings are there on a hydraulic excavator?

<p style="text-align: center;"><img src="/ueditor/php/upload/image/20220111/1641875973101623.jpg" title="1641875973101623.jpg" alt="8.jpg"/></p><p style="text-align: justify;">A tracked&nbsp;hydraulic excavator&nbsp;requires about fifty <a href="https://www.sunspeedbearing.com/products/catalogue.html" target="_blank" style="color: rgb(0, 112, 192); text-decoration: underline;"><span style="color: rgb(0, 112, 192);"><strong>bearings</strong></span></a> for its basic operation (travel and rotation).<br/>Irrespective of its size and its use (earthwork, mining, demolition), it is made up of a crawler track chassis topped with a superstructure including the engine, hydraulic components (pump, motors, cylinders), the driving cab and the attachment (arm, boom, dipper, bucket).<br/>&nbsp;</p><p style="box-sizing: inherit; font-family: &quot;Helvetica Neue&quot;, Helvetica, Arial, sans-serif; margin: 0px 0px 0.5rem; padding: 0px; color: rgb(30, 30, 30); text-rendering: optimizelegibility; line-height: 1.4; font-size: 1.065rem; white-space: normal; background-color: rgb(255, 255, 255); text-align: justify;">Travel</p><p style="text-align: justify;">The two track sets are each driven by a planetary reducer using&nbsp;2 <a href="https://www.wswbearings.com/products/Back-up-Bearings/929.html" target="_blank" style="color: rgb(0, 112, 192); text-decoration: underline;"><span style="color: rgb(0, 112, 192);"><strong>angular contact ball bearings</strong></span></a>&nbsp;or&nbsp;tapered bearings&nbsp;- for supporting the reducer - and&nbsp;14 needle roller bearings&nbsp;- for planet gears.</p><p style="text-align: justify;">? 32 bearings&nbsp;are thus necessary so that the machine can move.<br/>&nbsp;</p><p style="box-sizing: inherit; font-family: &quot;Helvetica Neue&quot;, Helvetica, Arial, sans-serif; margin: 0px 0px 0.5rem; padding: 0px; color: rgb(30, 30, 30); text-rendering: optimizelegibility; line-height: 1.4; font-size: 1.065rem; white-space: normal; background-color: rgb(255, 255, 255); text-align: justify;">Swing</p><p style="text-align: justify;">The superstructure pivots 360° thanks to a slewing ring of about 1.50 m diameter fixed on the straight truck chassis and a hydraulic motor or a planetary reducer. This includes&nbsp;12 <a href="https://www.its-bearing.com/products/Needle-Roller-Bearing/110.html" target="_blank" style="color: rgb(0, 112, 192); text-decoration: underline;"><span style="color: rgb(0, 112, 192);"><strong>needle roller bearings</strong></span></a><span style="color: rgb(0, 112, 192);"><strong>&nbsp;</strong></span>for the planet gears and&nbsp;2 <a href="https://www.vistabearing.net/products/Spherical-Roller-Bearing/910.html" target="_blank" style="color: rgb(0, 112, 192); text-decoration: underline;"><span style="color: rgb(0, 112, 192);"><strong>spherical roller bearings&nbsp;</strong></span></a>for the shaft support.<br/><br/>?14 bearings&nbsp;contribute to the swing of the superstructure.</p><p style="text-align: center;">&nbsp;<img src="/ueditor/php/upload/image/20220111/1641875983945408.jpg" title="1641875983945408.jpg" alt="9.jpg"/></p><p style="text-align: justify;">Note that the&nbsp;plain bearings&nbsp;equip the various joints located on the boom, the dipper and the bucket.</p><p><br/></p>