Last week I was looking at a plain (no frisket) power Universal I AB which was running erratically; turns out the driving gear had loosened and was binding against the housing that covers it. Then we tried to readjust the clutch according to the manual. But when there is just enough clutch friction to pass the trip cam, it isn’t enough to get over the cylinder check cam from the feed board position. Next we’ll disassemble the clutch and clean it and see if that improves the situation.
Then, trying to follow the limit switch cam adjustment instructions, the cylinder stops at 1″, rather than the specified 1 -5/16″, and that difference happens to be the same as the thickness of a bumper leather. There are the mounting holes for bumper leathers behind the cylinder, but they are only present at the front.
So, can anyone tell me if bumper leathers should be present behind the cylinder on this press? Or are they not used in direct contact with the bumper springs?