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The needle suspension is
jammed or hangs up.
The needlebar pin
wobbling and / or feels to
loose.
The needlebar pin
moved and makes contact
with the housing.
Needlebar retainer
worn or
bearings
clogged.
Needlebar retainer
hard set against needlebar.
Excenter bearing
defect.
The motor
is defect.
The machine or pistons
are new. The suspension
needs break in.
The needlebar pin
loose.
The inner piston
clogged.
is
The needlebar pin
loose.
The inner piston spring
is defect.
has
Relocate and tighten the needlebar
. Use the assemble
pin
instructions no. 8.
Clean and lubricate or replace
to
Readjust needlebar retainer.
Replace excenter assembly
Use the disassemble instructions
no. 4-6 and assemble instructions
no. 1 & 5-6.
Use the disassemble and assemble
instructions as reference.
Lubricate and run the machine for
a few minutes while holding the
needlebar pin
fingers and let the inner piston
break in.
is
Use the assemble instructions no.
8.
is
Remove the inner piston
the disassemble instructions no. 1-
3. Clean and re-lubricate. Use the
assemble instructions no. 7-9.
Use the assemble instructions no.
is
8.
Replace.
.
.
with your
. Use
7
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