Questions about Icemaker

Hey guys,

I have a problem with my ice maker. The last couple of years we have noticed that the Ice just doesnt keep up. I have noticed some ice in the fill tube whenever my wife says were running out but sometimes it doesnt seem like it would be enough to stop the flow. I ordered a new icemake from you last year but since it started working I have yet to install it. Just to be on the safe side I will tell you what ive done. The water in the door works great. I swapped the wires on the valve, pressed the water dispensor and it filled up the tray fine. I am assuming that means the the valve is ok but does the fridge come with a built in water filter that may be slowing down the water flow? If there is one it hasnt been changed in 13 years. The door dispensor seem fine. Should I go ahead and change the ice maker anyway? Also, my wife chews on crushed ice all day but when she was out of town I noticed that it kept up with cubed ice for me just fine. Would using mostly crushed ice cause the maker to have trouble catching up?

Thanks for your help as always,

Mike