Sounds like a leverage issue. It can swing it one way but can't get enough torque to lift it back up. Using gears can help increase your torque. 
http://curriculum.vexrobotics.com/curriculum/mechanical-power-transmission/gear-ratios
here's a Vex page on the topic. 
Brandy

On Sun, Nov 9, 2014 at 3:04 PM, Heather Young <[log in to unmask]> wrote:
My team is having a hard time making the robot move once the arm is down.  Can anyone help us?
 
Thanks,
Heather Young
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