Trying to time a sq baler is one of the reasons an operators manual is a necessity.
Bring plunger head rearward on compression stroke by turning flywheel CCW,trip measuring wheel to engage knotter,when face of plunger head is center in forward feeder fork slot then measure from LH side of baler to tip of feeder fork(10-12"s), continue turning FW when needles are just starting up in bale chamber and are even with the channels that are in bottom of bale case,the points on face of plunger head face should be even with needles. If adjustment isn't correct needle lift drive that is at rear and re-adjust timing. HTH,Tx Jim