Though the international regulations about the noise level of earth-moving machinery becomes more and more strict, it is not known that an analytical tool could be applied to predicting radiation noise. In this study, a systematic procedure is introduced in terms of the noise source modeling, application of the existing analytical tools, and verification. This research selects BEM and SEA by considering the modal density, and does the noise sources modeled in appropriate forms for each method. A half-scale model of real loader and a simple source are used to verify the approach. Comparisons of the simulated and experimental results show good agreements in both the simple and real loader cases. These results suggest that the approach should be applied to the investigation of ways for an effective noise reduction by using a simulated noise prediction.