... .( 4 ) Slewing mechanism : equipped with four-speed winding motor and "Shengjian " brand, the quality is the same with ... " .( 5 ) Luffing mechanism is double-speed cone rotor motor, so It’sneedn't refill gear lubricant or maintenance , and ... and automaticsubmerged arc welding. Feature: advanced technology,strongconnectivity.( 8 ) Driver cab : With arc space capsule , toughened glass , widefield of ...