Condition monitoring of machines is determination of condition of machine and its change with time. Working condition of machines may be analyzed by measuring physical parameters like: vibration, noise, wear debris, temperature, oil contamination, etc. Wear debris and vibration condition monitoring have great importance in machinery maintenance and fault diagnosis. This paper deals with effective analysis of both combined vibration condition monitoring and wear debris in machinery maintenance and fault diagnosis. Both techniques have their own merits and demerits associated with monitoring and fault diagnosis of machinery. However, it is seen from the past practical experience that using these techniques independently gives a small portion of machine fault diagnosis. By combining both the techniques in machine fault diagnosis it can provide more reliable information. The objective of this paper is to analyse the co-relation between techniques, achieved by experimenting worm gear box at different operating conditions driven by electric motor. Initially, the worm gear box runs under normal conditions. A number of tests has been performed with different contaminant particles added to various lubricants. Wear debris and condition monitoring techniques were studied and results obtained were compared.