Coal Age

MAR 2014

Coal Age Magazine - For nearly 100 years, Coal Age has been the magazine that readers can trust for guidance and insight on this important industry.

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The new jacking system developed by Liebherr is a straightforward, cost-efficient method of raising the mining excavator's superstructure for necessary maintenance or replacement of the slewing ring. This jacking-up principle is a safe, efficient alter- native to complex lifting work with a crane. The system has four synchronized hydraulic supports with an integral power stage and mechanical locking, the lifting frame, and a roller unit on which the work- ing equipment is supported. These elements work smoothly together and lift the load safely with optimal weight distribution. As soon as the cylinder pins have been removed, the lifting frame has been installed and the bolts securing the slewing ring have been unscrewed, jacking up can be carried out by one person. In only 15 minutes the superstructure reaches the maximum height needed to run the under- carriage out from beneath it. An ergonomi- cally designed wireless remote control permits unrestricted movement, and an integral LCD display enables the user to monitor the system while the superstruc- ture is being lifted. Mining Z System for Buckets To maximize bucket fill factor and improve cycle time, Liebherr has developed an extensive range of teeth and wear protec- tion elements or ground-engaging tools (GET) to perfectly fit Liebherr backhoe and face shovel buckets. The new GET series designed for use with Liebherr mining excavators enables easy material penetra- tion while extending bucket steel structure lifetime. The innovative bucket lip and side wall protection from a shield around the bucket areas protects against material abrasion. Edges and adaptors are shaped to protect the welding of the blade. This has a positive effect on the cost per ton of exca- vated material. The new Liebherr Mining Z system, for instance, consists of a tooth adapter weld- ed on the lip, a tooth, a wear cap, a lip shroud and a unique securing pin with a locking arrangement. The Z system is suit- able for extraction work of all kinds. The CL, CR and P profiles are available in five sizes for a broad range of applications. These sizes cover light (GP), standard/ medium hardness (HD) and extra-hard (XHD) terrains. The truly hammerless lock- ing system simplifies tooth and wing shrouds replacement with a single tool. By turning the tool clockwise through 90˚, the retaining pin, tooth, and adapter can be rapidly released or locked into position. The Liebherr GET are compatible with Liebherr mining backhoe and face shovel excavators up to the R 9400. h y d r a u l i c e x c a v a t o r s c o n t i n u e d March 2014 www.coalage.com 35 Liebherr's Mining Z system protects bits. CA_pg34-35_V2_CA_pg46-47 3/12/14 12:22 PM Page 35

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