To thread a Massey Ferguson baler, you will need to follow these steps:
1. Make sure the handles are in the down position and the baler is turned off.
2. Lift the top cover of the baler and locate the knotter mechanism.
3. Remove the knotter covers at the top and bottom, and then remove the knotter.
4. Locate the twine ends that are in the knotter, and then remove them.
5. Thread the twine through the front slot and then through the rear slot in the knotter.
6. Pull the twine out of each of the slots and then tie off the loose ends together on the knotter.
7. Feed the twine into the eyelets at the top and bottom of the knotter, so it is held in place.
8. Put the knotter cover back on, and then put the knotter in place and secure it.
9. Check that the twine is properly tensioned, and if not, adjust as necessary.
10. Close the top cover of the baler and pull the handles up to turn it on.
11. Finally, check the twine to make sure it is correctly fed through the knotter.