Thre are no timing marks on this equipment. But, here goes. You will need to know the names of the parts involved.
Turn the flywheel ccw to move the plungerhead on the compression stroke to a point where the face of the plungerhead is in the center of the front feeder slot in the bale case.
Locate the left hand edge of the the feeder tooth 17 5/8" (measured horizontally) from the extreme left-hand top of the feeder support. Use a block of wood to hold the teeth in this position. Place it between the teeth and the feeder support bracket. Now connect the main drive chain and tighten the chain with thumb pressure on the idler sprocket.
With needles in home position, trip the knotter using the measuring wheel and then rotate the clutch ring CCW (as viewed facing the LHS of the baler) until the lug on the the inside of the clutch ring contacts the trip dog roller. Now put on the knotter drive chain. If the teeth don't exactly line up, back the clutch ring away from the roller until you can get it on.
If you get it right, the needle timing will be good when the tip of the needles has risen flush with the top edge of the bale case bottom grooves. At this point, there should be 1 to 2 1/4" between the face of the plungerhead and the center of the rounded portion of the tip of the needle. Better if closer to the 1" reading.
You may have to adjust the length of the needle lift link if these dimensions are impossible to achieve.
Put the shields and covers back on. Run it thru by hand a few times (including the knotter trip) with the twine removed and the bale case empty to make sure it all cycles properly. Other wise, there's gonna be some noises (at about $300 per clunk).
By any means get a manual you can see the pictures really well and read the full text. I put a video on Youtube in slow speed to show its cycling. Look for it by searching for "baler knotter"