Rotating machinery vibration problem is the most significant restriction which control the life time and may cause disastrous failure of the entire system. The vibration monitoring is the main element for any customized maintenance program to guarantee power plant availability and minimize danger of predictable failures. The present work is an experimental study on a small centrifugal pump running in healthy and intentionally defected to show the difference in the vibration spectral and time domain. Triaxial acceleration measurements were made at the shaft of the pump. The most dangerous case of vibration denoted by the highest amplitude as determined as well as its corresponding frequency. The most serious case was the pedestal looseness with full flow rate which cause a vibration of amplitude of (0.104g) at frequency (47Hz). The unacceptable vibration, as classified according to ISO 10816 to have amplitude of (0.5g) for small machines within this rang of acceptable vibration it was not difficult to predict the artificial defects mode in the pump and demonstrated the capability of condition monitoring.