Revolving Frame
1.Welded sturdy box construction,using heavy - guage steel plates for ruggedness.D - section frame for resistance to deformation. Swing Mechanism
2.Axial p-iston motor with planetary reduction gear is bathed in oil.Swing circle is single - row,shear- type ball bearing with induction - hardened internal gear.Internal gear and pinion gear are immersed in lubricant.Swing parking brake is spring - set/hydraulic -released disc type.