3
CONDITION CAUSE HOW TO FIX REFERENCE
6. NOISY 1. BACKLASH BETWEEN SEE MECHANICAL P.15
OPERATION ROTARY HOOK GEAR AND ADJUSTMENT "NEEDLE
LOWER SHAFT GEAR IS TOO CLEARANCE TO ROTARY HOOK".
GREAT.
2. TOO MUCH UPPER SHAFT PLAY REDUCE THE UPPER SHAFT PLAY
3. INAPPROPRIATE BELT SEE MECHANICAL P.25
TENSION. ADJUSTMENT "MOTOR BELT
TENSION".
4. UPPER SHAFT GEAR IS LOOSE. ELIMINATE THE LOOSENESS.
5. NOT ENOUGH OIL. OIL ALL MOVING PARTS.
7. DEFORMATION 1. INAPPROPRIATE ZIGZAG SEE MECHANICAL P.11
PATTERN SYNCHRONIZATION. ADJUSTMENT "NEEDLE
SWING".
2. STRETCH STITCH FEED IS SEE MECHANICAL P.20
OUT OF BALANCE. ADJUSTMENT
"STRETCH STITCH BLANCE".
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