Knocking noise AFTER replacing my icemaker? What did I do wrong?

We replaced our Samsung RF26XAEBP/XAA icemaker by following video instructions and now we have ice again! BUT now there is about 8-10 knocking or clicking noises coming from what seems like the back of the icemaker that happen just before it dumps the ice into the bin. We thought maybe we didn't line something up right, so we uninstalled and reinstalled the icemaker, and that noise is still there. What is that and how do I fix it?