Chainsaw Repair

I have an MS180C and I cannot get it to oil the chain. I have never worked on an oiler issue with a Stihl. I have got it apart and am looking at the part that appears to spin the oiler(photo attached). I'm thinking that this part that mesh's with the oiler may be worn. I can slip this on and off of the shaft without spinning it. I took a pic of the part that I think is the culprit.

If you remove the black wrap handle, you can access the oil pump/line at the bottom, and clean it out, the holes in the oiler are tiny and clog easily.

Thanks for the help….However, I am not understanding how to remove the handles. Are the black rubber grommets just pressed in? Not sure what holds them in.  I must be a rookie with the Stihl equipment.
Randy

OK, I have the handle off, however I did destroy 2 of the rubber mounts. I also cleaned the oil line. In my opinion it did not appear to be clogged. Now, do I replace the oil pump and if so, how do I get at it.  I just don't want to put it together and not have it work. It appears that I will have to remove the jug from the case?? Like I said before, I am new to Stihl repair. I also am concerned how to remove the rest of the rubber mounts and also how to reinstall them.
Can I order parts online or do I need to go to a dealer. Any repair instructions and parts list will be appreciated. Thanks again for all the help. These sites are great.
Randy

You do not need to remove the engine to remove the oil pump it is thread in the end you took you screw out of. You will have to use that screw and apply even pressure with two screwdrivers and the pump will slide out of the housing.