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If you've replaced the chain on the left side between the plunger drive and the knotters, then it's your knotters that are out of time with the rest of the baler if the plunger is striking the plunger stop. How much shorter is the new chain? More than a few links? I suppose it could be due to length of the chain, but with the amount of adjustment in the tensioner you could probably be 2 maybe 3 links short and be ok. I wouldn't want to be anymore than a couple myself, as long as you can apply the correct tension. The chain should deflect 1/2" when pressed at the longest span. You don't need to stretch it taught, just use common sense. If you need more links, just get the "repair" links from NH and add them in. If you have the manual then I suggest you start at step one and "re-time" the entire baler. If not, then here's the quick version. Set the plunger in it's position with the crank vertical between it's timing marks (left side on top of the frame surrounding the cutout). Then with the needles in the "home" position (all the way back, make sure thay aren't drifting out of "home". If they are you will need to correct this first.) check to see if the horizontal lines across the knotter clutch/drive align within 1/4". If not, remove the drive chain and turn the clutch until they do. Put the chain back on, trying not to move the clutch when you tension it. Now that you have checked these items, might as well check to see that the feeder tines are in time to. From the back of the baler, to the right of the knotter brake open the access panel and look at the position of the tine bar. The point that it connects to the drive chain should be between to vertical notches cut in the frame. If these aren't visable, the point is about 4 inches from the leftside of the cutout for the door. I would also make sure that the plunger stop moves freely. Disconnect it from the needles and move it. It should be faired (the flat side) with the left side of the bale chamber when needles are "home". Adjustment is obvious. Once done, run it by hand a couple times tripping the knotters making sure that the horizontal lines on the knotter drive clutch return to within 1/4" of eachother after each tying cycle.
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