Clarification needed:
One knot is good, One is bad ?
or
Both knots are bad ?
Empty the bale chamber and unload the twine. Roll it over by hand VERY slowly. First step is to watch the tucker fingers move very close to the rising needles. Pay attention to the tucker finger clearance (!/8" or so), especially on the 'bad' side. If the tucker fingers don't run in parallel and run by the needles as a pair, then the shaft is bent or the hinge pin is loose. Straighten and retime the tucker finger advance.
The other most likely of the cause of knot failure is twine tension coming out of the twine box: should be about 10 lbs. If too light, the resulting slop in the twine section will mess up placement into the twine disk.
also ,watch the billhook action and the wiper arm movement. If the wiper arm doesn't make positive contact with the billhook foot, bend the wiper arm until it does.
Because it ties stationary, my bet would be on the tucker finger not pulling the twine into position on the twine diskslot. Out in the field, a bumpy ride can cause the fingers to misplace the twine into the disk and you get a knot but no tie.
Having one good knot makes diagnosis easy. Make the bad side run just like the good one for twine box tension, tucker finger rotation, twine disk placement, billhook opening and closing, wiper arm movement and needle brake stop at home position.
