Need pulleys for my TD One derailleur - Mountain Td-one Bicycle Front Derailleur Bike Parts 149

Well, it's not antique, and I am not aware of any Schwinn that came with "automatic shifting", but if you mean the Positron derailleur, often part of an bike with FFS (front freewheeling system) then what you do is shift so that the chain is on the middle rear cog and then turn the adjustment screw in the middle of the derailleur so that the derailleur pulley is directly below the cog. I that does not fix the issue you need in-person help from an experienced mechanic. If none of this applies than you need to provide a better explanation of what you have or a pic.

I’m happy to help further over the phone at https://www.6ya.com/expert/donald_f2ed37026a3ac881

I'm not sure what you mean by "shifter blade", but I might assume it might be the cage of the derailleur. On the front derailleur there is either a rivet or a small bolt at the trailing edge that holds the two halves together, if it is a rivet then it is not repairable and the derailleur will need to be replaced, if it is the bolt, it is probably a 8mm socket head, tighten to the right. If it keeps loosening up from road vibration then the threads could be stripped (replace the derailleur), or else put a drop of Blue Loctite on the threads to prevent it from backing out. If you are talking about the rear derailleur cage that holds the two pulleys in place, these have two Allen type bolts, probably 3mm or 4mm Allen wrench size. The bolt slides through a small bushing inside the plastic pulley wheel, the bushing is slightly wider then the pulley to prevent over tightening the cage plates against the pulley, thus preventing the pulley from spinning freely, use the Blue Loctite if the bolts keep coming loose. Blue Loctite (also known as 242 Loctite I believe) is the removable type and provides some extra friction to prevent bolts from backing out. Now if by "shifter blade" you are referring to the shift/brake levers, these have a small amount of "play" in them from the factory, a little bit of wiggle. They basically are not serviceable. Try adjusting the derailleur cable to see if that removes excess play. If they still have an excessive amount of play in them, then you will need to replace the shift/brake levers as a unit. If you do this, make sure you get the shifter that is designed for the number of cogs you have in your gear cluster and front chain rings. I would recommend also replacing your chain and rear cluster at the same time so that all part wear evenly for optimal shifting performance.

Riding small-small is called cross-chaining, and is not recommended. On a double chainwheel bike at least the smallest and sometimes the next smallest should not be used. On a triple it's more like the 3 smallest. Nevertheless, the derailleur pulleys should take up the slack at least, if you have not made any changes to chain or derailleur. The spring on the pulley cage may be broken or weak. You need to get in-person help at a bike co-op or bike shop.

I’m happy to help further over the phone at https://www.6ya.com/expert/donald_f2ed37026a3ac881

Are you in love with TD-One parts or would an upgrade to almost anything Shimano be a possibility? Look on eBay. A Pacific Bicycle or any bike sold by a department store isn't really what one would consider an upgrade-worthy project. A new bike better might be cheaper considering labor costs. Replacement of parts for failure might be worthwhile.

Maybe go through the whole procedure. Web search "adjust front derailleur" for videos.

http://www.parktool.com/blog/repair-help/categories/derailleur-systems

Don't start messing with the derailleur yet! Make sure your shifting trouble isn't due to something else, such as a warped, dirty, or stretched chain, gummed-up pulleys, crud in the cable housing, trapped cable, or a bent derailleur hanger
Clean the chain and the rear derailleur pulleys. Pull the chain away from each pulley, and turn the pulley to make sure it can move freely. A pulley that offers resistance to turning must be replaced.
Now check the cable to be sure it slides freely. Mud and grit within the cable housing, or on a cable-guide, can keep the derailleur from moving a "full gear" during downshifts. If the cable doesn't slide freely in the housing, you may be able to clean or lube it to restore smooth shifting.
Let the high-gear limit screw. In your highest gear on the shifter, and with the chain on the smallest cog, position the derailleur so the upper pulley exactly matches the teeth of the small cog. Run the chain a bit with the front derailleur in the large ring, adjusting the limit screw until the pulley and the cog seem to match perfectly.

Setting the high-gear (small cog) limiting screw.

Once you're sure the derailleur matches the cog, move it just a whisker (1/8 to 1/4 turn) towards the other cogs. (You may need to readjust a bit if you get chain-skip.)

Closeup of setting the limiting screw.

Now adjust the low-gear limit screw. Shift into the lowest gear (largest cog). If it won't go, loosen the limit screw. With the chain on the largest cog (and the front derailleur in the small chainring), adjust the derailleur so the upper pulley exactly matches the teeth of the large cog.Once it's perfect, turn the limit screw so it moves the derailleur a tiny amount towards the other cogs (1/8 to 1/4 turn usually works).

Setting the low-gear (largest cog) limiting screw.

Now shift to the highest gear (smallest cog). Push the shift lever to downshift one gear (go from the smallest cog to the next-smallest). If it doesn't shift, tighten the cable with the barrel adjuster, 1/2 turn counter-clockwise. Backshift and try again. Continue tightening until it shifts. If it overshifts, going from the smallest cog to the third-smallest, loosen the cable by turning 1/2 turn clockwise. Backshift and repeat until it shifts exactly from the small to the next-smallest cog.

Fine adjustment of tension in the derailleur cable.

Now go to the second-smallest ring. Tighten or loosen the cable slightly, until the outer side plates of the chain are just clearing the third-smallest cog. Shift up and down, fine-tuning until you're satisfied.

Checking the position of the chain on the cogs.

Here a video guide that may help:
If the chain is routed through the derailleur OK but there's no tension on the pulleys just remove the lower pulley, rotate the pulley cage counterclockwise, pass the chain in front of the top pulley and behind the lower one as you reinstall it.
It's very important once the chain is correct that the derailleurs are properly adjusted. If you still have problems take it into a bike co-op or bike store.

I’m happy to help further over the phone at https://www.6ya.com/expert/donald_f2ed37026a3ac881

I had to use Google translate, as I do not read German. However, I think you are asking which derailleur pulley wheels go on the top and bottom. I would suggest Googling for images of your particular derailleur. It appears to me that the large pulley wheel goes in the upper position, and the small in the lower.

Check out his site. It has everything you need to understand these adjustments. The 'regions' are parts of the bike.

http://www.parktool.com/repair/byregion.asp?catid=53&imageField2.x=37&imageField2.y=13

Possibly the right one, but I doubt it.

Load-induced upshifting is usually due to the indexing adjustment being off due to normal expected cable stretch over time.

You might need to adjust the tension of the rear derailleur cable. Get a bead on how the gear selected and the two derailleur pulleys line up as viewed from directly behind. They should all be in the same vertical plane. If the pulleys are slightly outboard of the selected gear you can expect random upshifting to the next highre gear (smaller cog).

Turn the barrel adjuster at the derailleur about 1/4 turn CCW as viewed from behind the bike. This will make the cable a small bit tighter and you should see the pulleys move inboard to be better aligned with the selected cog. Try riding it and see if it gets a little better, then try another 1/4 turn. Don't go overboard with it though.