Our Vandercook No. 4 does not stay in trip. When printing, the operator has to hold down the trip to keep it in place. In comparing it to our other No. 4, the trip mechanism is still in place, but the trip bar connected to the handle has a lot of play; there is no tension to keep the lever raised to rotate the shaft connected to the rear trip wedge and I can’t get a good vantage point to see what, if anything, is missing or broken. Any insight?
Eric this is what you wrote, but on Briar Press:
I have made this repair, too. The wrench size 1/2″. Sometimes the threads on the bolt (5/16 -18) are stripped. Be sure also that the short tension block, which is threaded, is keep parallel. It is indicated in yellow in the image below from Sheet 107 of the manual.
There is a loose nut on the screw on which the lever pivots. Tighten it. Access is the problem, and I have pried open the sheet metal covering it enough to get a wrench in there.
I have written about this before, but can’t find it in the archives. Perhaps Paul can find it or elaborate.