Over the past few years, the approach of light-weight construction has become more important in many areas of engineering beside the automotive and the aircraft industry. Particularly when it comes to the operation of mobile machinery in forestry, the weight of the used devices is crucial from an ecological and economical perspective. The aim of this diploma thesis is to describe and analyze the optimization of a cable crane trolley in terms of weight. Since the stresses in operational use are hardly known and just common load cases are dealt with in literature, they will be determined by an experimental analysis. Based on this loadcases and numerical simulation models an optimization of the structure will be conducted. The aim of the optimization is to reduce the weight of the structure as much as possible without simultaneously reducing functionality. The weight reduction will lead to improved efficiency in wood excavation and subsequently to better crop and less damage of the forest floor. As a result of the topology optimization process, the weight of the optimized parts can be reduced by approximately 25 percent (based on their original weight). The resulting design of the numerical optimization process is often very hard to establish and therefore it has been interpreted into a manufacturable form for production purposes. During the course of this work a new overall concept has been developed. Besides the topology optimization a change in materials as well as potential benefits of using new technologies were analyzed. Given that all these saving potentials are actually exploited, the overall weight can be reduced by 20%.