Brother 3034D - Manual (Page 18)

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3. Pass the thread through the eye of the lower
looper.
4. Slowly turn the hand wheel, and make sure the
returns to the original position.
NOTE:
If the lower looper thread breaks during sewing, cut and
remove thread from both of the needles.
Before re-threading the lower looper, make sure that the
lower looper re-threading is done exactly as
diagrammed. The machine will not operate properly if
the threading is not done in the proper sequence.
CAUTION
Thread the needles after the lower looper and
upper looper have been threaded.