Rotation gearbox MT5

47 Meters into the bore at The Lodden the rotation gearbox became very noisy. the two hydraulic motors that drive had a distinct bearing rumble and even with no load there was a grinding sound. The rotation box was removed and stripped. We found that the main thrust bearings in the gearbox had suffered water corrosion at some time and the last few days work had just aggravated the problem. Also the hydraulic motors had also suffered bearing damage, causing the seals to start leaking excessively. Parts were no problem and the motors were Rexroth , the gearbox bearings were available. Two days later the rotation box was assembled and fitted to the giant jacking frame that it belonged to. The photos show the size and weight of the parts in question.

Please click on the images to enlarge.










The clip below shows the rotation box in motion and boring away after the repairs.