Yes,the bearing adapter needs to come out I can see one spot where you peened the edge over so you'll need to tap it back in & smooth it down & while your at it run some emery paper all the way around it to clean it up & maybe even take off alittle metal,then oil it & it should slip right out,if not tap it back in & sand some more until it does.
One of 2 things you might have loosened the feed cam just to the left of the hook gear on the lower shaft or you took the timing belt off & didn't get it back on correctly
Are you threading the thread through 2-holes in the spool pin on top of the machine?If not as your sewing the thread can work it's way out of the next tension unit & if you don't have enough tension it will jam,also are you sure your wrapping the thread around the 2nd tension 1& 1/2x? Also don't forget to give the hook some oil everytime you change your bobbin,it just needs 1-drop in the groove that it rides in.
It's a lousy repaint by Goldsworthy of either a Consew 226R or Seiko,look how they painted over the rod on the backside,even the needlebar & pressure bar have paint on them!They used to put their name on brand new Pfaff's too,
Here's a pic of the adjusting screw,you want it pull pull just alittle counterclockwise,so the little tab of the hook basket under the needle plate pulls foward so the thread can go past it.
Adler 67,167,267 bobbincase opener adjustment screw.jfif
I think you might be over oiling it,& just put a couple of drops a day in the reservoir instead of filling it as I almost certain it just wicking out when it's full until it's empty.
It's a good machine BUT Pfaff quit stocking alot of parts for it,you'll have to hunt ebay for that back bar or hope to find even a parts machine.There is a good shop in Indy that can work on it.Call Ed @ Indianapolis Sewing Machine.
Set the needles side by side,you'll notice the 135x17 is approx 1/4" or 6mm shorter.Lower the needlebar all the way down,mark it right at where it comes out of the bushing.Open the side cover & loosen the set screw @ the clamp(while holding onto the bar) & lower it the 1/4" & tighten the screw & give it a test sew.
Get some large adjustable pliers & grip the pulley in the groove.OR you could put a belt in the pulley & hold on to it real close to the pulley while trying to loosen it.
One more thing to check ,if you loosen the set screw that holds the needle in how much play does the needle have left to right? Sometimes after years of changing needles & tightening the screw it enlongates the hole that the needle fits into & can cause it to hit on the left.