Zoomlion ZR185 piling rig/Guide Rack Rotation bearing Assembly of Drilling rod/kelly bar Part-3

Hi guys.....
lets learn about Zoomlion ZR185 piling rig/Guide Rack Rotation bearing Assembly of Drilling rod/kelly bar .
The Delmag Kelly Bar (one of their most frquently used options) which is a telescopic drilling rod, is used for Kelly drilling works to transfer the torque and pre-stressing forces to the auger tool. The length of the Kelly bar and the auger defines the maximal reachable drilling depth.