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SEWING MACHINE DtV. 20
MODEL 384. 15358
CONDITION
6. NOISY
OPERATION
7. DEFORMATION
PATTERN
CAUSE
HOW TO FIX
REFERENCE
P.17
1. BACKLASH
BETWEEN
SHUTTLE
HOOK GEAR AND
LOWER SHAFT GEAR IS TOO
GREAT.
2. LOWER SHAFT GEAR IS
SEE MECHANICAL
ADJUSTMENT
"CLEARANCE
BETWEEN
NEEDLE AND HOOK
(NO.2)".
ELIMINATE
THE LOOSENESS.
LOOSE.
3. INAPPROPRIATE BELT
TENSION.
SEE MECHANICAL
ADJUSTMENT"MOTOR
BELT
TENSION".
4. UPPERSHAFTGEARISLOOSE.
5. NOT ENOUGH OIL.
1.1NAPPROPRIATEZIGZAG
SYNCHRONIZATION.
2. INAPPROPRIATE
DISENGAGEMENT
OF CAM
FOLLOWER.
3. UPPER THREAD TENSION
ISTOO
STRONG.
ELIMINATE THE LOOSENESS.
OIL ALL MOVING PARTS.
SEE MECHANICAL
ADJUSTMENT"NEEDLE
SWING".
SEE MECHANICAL
ADJUSTM
"DISENGAGEMENT
OF CAM
FOLLOWER".
ADJUST
UPPER THREAD
TENSION
CORRECTLY.
P.26
P.14
P.24
P.11
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