After understand the problem is because of yoff of wheel I set the atv’s wheel yoff to 0.5f
player.addWheel(wheel_bl.getParent(),new Vector3f( box.getCenter().x,0.5f,box.getCenter().z),
wheelDirection, wheelAxle, 0.2f, wheelRadius, false);
and placed collisionshape and spatial manually.Also setted rollinfluence of wheels to 0.It is working fine now.Thank you all.
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