Are you trying to remove the wheels from the axles :feedback
Need a better description of what your trying to do.
The wheels should lift directly off the chasis now that the plates have been removed.
If your trying to remove the wheels from the axles, you can do it two ways. 1) Take a pair of needle nose pliers and use a back and forth rocking motion exactly where the wheels meet the axle. 2) using both hands while holding the the wheels/axle in your chest, pull on both wheels and they will easily come off, this might be the easiest way to get the wheels off, as it desn't require a lot of elbow grease.