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There are no pulleys on the front derailleur. Only the Rear derailleur has pulleys.
The Front derailleur consists of two plates that work the front gears (chainrings)
The Rear derailleur consists of a long arm with 2 pulleys to wrap the chain while shifting the rear gears (cassette).
Pulleys range from $10- a pair to $75-. Your local bike shop should have a suitable replacement set of pulleys, depending on the model of your derailleur it is sometimes less expensive to just replace the whole unit.
Try to get the oil to flow down the cable on the inside, and oil up the front derailleur, and the shifter itself, Use 2 cycle oil if you have some, it is real slippery. Do all of them while you are at it. Hope this helps.
You will need to purchase new cables obviously, but I would strongly advise that you purchase them as part of a set that includes the outer housing. That way you'll be sure your shifting is smooth and trouble free. You will need to loosen the pinch bolts at both derailleurs and pull the cable loose. Then you can pull them free at the shifter....I'd recommend going to the shimano website or sheldon brown to see illustrations on exactly how to do this. You then replace the cable housings (don't forget to inject some lube into the them) and then rethread the cable. You will also need a cable cutting tool (don't use anything else as the cables will fray) and some cable caps. Tighten the pinch bolt at the derailleurs, adjust the shifting and your done.
Set the rear derailleur to the lowest gear (big cog) and the front to the lowest gear (small chain ring). Disconnect the derailleur cable. Screw in the adjuster for the cable tension all the way (this adjuster is on the shifter of a mountain bike or the down tube of a road bike). Pedal to make sure the chain is not rubbing on the derailleur cage. If it is, adjust the "L" setting on the derailleur until the chain moves by without touching the cage. Now pull taut and reattch the cable and shift the front to the big ring while pedaling. If it does not shift up well or completely, hold the shifter past its normal shift and adjust the "H" screw so that the derailleur allows the shift. Shift into the highest cassette gear and keep pedaling. The chain should not be touching the front derailleur's cage when you pedal. Adjust with the barrel adjuster until the chain moves freely without touching the derailleur cage.
There are several things that could be wrong. You could have thrown your chain (you couldn't ride at all if so). The bike could have been crashed and the derailleur bent. The cable might have slipped where it bolts to the derailleur. Or the cable or shifter could need maintenance, too. It is most likely one of the above. If it is only the adjustment, there are two stop screws on the derailleur that can be adjusted.
My best advice for you is to either find a bicycle repair manual at a local bookstore or your library that can show you some of the detail. Or just let your local bike shop do the repair.
No, not natural. If it only does it when the front derailleur is in the big chain ring, then check to see if the crank is hitting the front derailleur. If that is not it, then the crank arms might need tightening. If not that, then the problem might be in the bottom bracket.