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Does the 78 use a screw drive to feed the plunger or a tine bar? For a tine bar baler...
Tine bar timing marks are located in the frame that supports the tin on the back side of the pickup chamber. Open the access panel to the right of the knotter brake and look down at the frame. There should be two vertical notches about 2 inches apart if not rusted away. If you can see them, turn your flywheel until the head of the tine bar (where it attaches to it's drive chain) is between these two points. Next, check plunger position. The timing marks for the plunger are on the right side frame under the access cover. Again these are two vertical notches about 2 inches apart. The plunger arm should be vertical between these two notches. If so, tine bar to plunger is correct. If not you will need to loosen the chain that drives the tine bar and reposition it on the sprokets to where your tine bar head falls into the marks. Next is knotter timing. Quick check, there are to horizontal marks on the knotter drive clutch. they should be within 1/4" of each other. Trip the knotter and run the cycle by hand turning the fly wheel. At completion of cycle they should be back together within that 1/4" inch and if I remember right your plunger crank will be back in it's marks. If not, then leave plunger in its marks, and adjust knotters by removing the drive chain on the left side of the baler then turn the clutch until the marks align. Reattach chain then trip knotter, check again. To check needles, trip notters, turn flywheel by hand until tip of needles just enter bottom of bale chamber about 1/2". The points on the plunger should be NO MORE than 3/4" past the tips of the needles. As you complete the tying cycle, you can check the needles as they past the knotter frames. They should just rub the knotter frame or with them about 2 1/2" past they should be centered between the l/h side of the notch in the twine disc and the drive cam. This is also a good time to make sure your "plunger stop" is working properly and not sticking. You can also check your twine fingers when the needles are in the above position. The points of the fingers should be 1/8" to 3/16" past the needle. At the end of the cycle with the needles back in the "home" position the tips of the twine fingers should be aligned with the edge of the cutouts in the top of the bale chamber. I can't quote any other adjustments off the top of my head. If you would like pictures you might try searching for Kelly C's website (if it's up again) He used to have details on how to time a NH model 68... It is my experience that most of the NH balers using a tine bar all time the same. I like the NH baler for it's simplicity (compared to my Oliver baler...)
Sorry for such a long post but without pictures...
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