I In the period April 2019 to May 2019, the production target at DMLZ had not been achieved. One of the things that affects the achievement of production targets is operator performance that is less than the maximum. Therefore, a study was conducted with LHD operator object research to analyze whether there are human factors that affect the workload of the operator so that it impacts on the operator's work effectiveness. Measurement of operator workload is done using NASA-TLX analysis, while the effectiveness of LHD operator work is analyzed using Overall Labor Effectiveness (OLE). This research was conducted using the method of direct interviews with operators and analysis of working time data and the actual production of LHD operators. The results of the NASA-TLX study show that the average LHD operator workload is included in the optimal load criteria with an average NASA-TLX score of 56. The factor that most influences the LHD operator's workload is the attempt to complete a draw order (effort) of 27%. The effectiveness of LHD operator work is most influenced by the achievement of production (performance). The thing that needs to be done to improve the performance of LHD operators is by optimizing the handling of hang ups or prioritizing to complete draw orders so that production targets can be achieved.