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Problem with Fixed Joints

Hey,

I want to simulate a Hokuyo lidar with a servo. So, I created a fixed joint between the servo's wheel and hokuyo link. But when I am controlling the servo with a predefined velocity, the joint is rotating with some random different velocity. But, everything is working fine when I am rotaing without the lidar attached.

Have I made a mistake in defining the joint?

<joint name="hokuyo_joint" type="fixed">
  <parent>servo_ax12a::Wheel</parent> 
  <child>hokuyo::link</child>
</joint>

Please help. Thanks in advance.