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SEWING MACHINE DtV. 20 MODEL 384. 15358
CONDITION
6. NOISY
OPERATION
7. DEFORMATION
PATTERN
CAUSE HOW TO FIX REFERENCE
P.171. 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