In this paper we concern with the implements of dither signal for a closed-loop DC motor system. Experimental studies show that The system contains two nonlinearities which are saturation with dead zone and backlash. Parameter estimation technique is used to identify the unknown system parameters with special care due to the existence of system nonlinearities. An analytical method is then presented to deal with the closed-loop DC motor system with two nonlinearities in the loop. Self oscillations are found to exist in the system. A good correlation between the theoretical and experimental results indicates the success of system identification and modelling process. Also the ability of dither to quench the limit cycle is demonstrated from these results.