Highlead GM747 User Manual
Customer
Copy
Service
HIGH
GM747series
HIGH-SPEED
MACHING
Instruction Manual
LEAD
OVERLOCK
SEWING
Parts
SHANGHAI HUIGONG
N0.3
Catalog
SEWING MACHINE FACTORY
To
the
Operators
.......
......
..........
.........................................
Contents
......................................................
.............................
l
Ho\\' to install the
Ho\V
to
operate
Lubrication
I . Lubrication .................................................................................................................................................... 1
2. Drainage ........................................................................................................................................................ I
3.
Needle Cooling
Threading
Thread
I.
..,
3.
4. Chain Looper Thread Cmn Control ............................................................................................................. 3
the
tension ..........................................
Tension Nuts Adjustment ............................................................................................................................. 2
Needle Thread Control ············· .................................................................................................................... 2
Looper Thread Control ................................................................................................................................. 2
Stitch Length
Need le
replacement
Differential feed
machine···········
the
ne\v machine
and
drainage
Lubrication-Silicon
machine .............
Adjustment
...........................................................................................
ratio
adjustment
........................
...............
...........................................................................................
...
.................................
....
.........................
.......
................................................
.....................................................................................................
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....
.............................
oil ................................................................................................... I
...
................................................................................... 1
.......................................................................
.................................. 2
............................................................................................................................... 3
....
............................................... 3
.................................................................................................................. 4
.............
1
1
I
Parts
relation
I.
Needle and Needle Plate .............................................................................................................................. 4
2. Upper Looper and Needle ............................................................................................................................ 4
3. Lo\vcr Looper and Needle ............................................................................................................................ 5
4. Upper Looper and Lower Lopper ................................................................................................................ 5
5. Needle and Needle Guard ............................................................................................................................ 5
6. Chain Looper and Needle ............................................................................................................................. 5
Problem
Parts
catalog .................................................................................................
and
settlement
timing ...................................................................................................................................
............................................. : ..............................................
.....................
....................
...
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...
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...
...............
Specifications
Models
GM747-3 3 5500- 6000
Thread
Sewing speed
(r/min)
Stitch
length
(mm)
0-5
Presser foot Decibel Torque
lift(mm) (dB) (N·m)
6
~84
~0.4
Overedging
width(mm)
1.5--6
4
...
....
......
5
8
;;a
GM747-4
GM747-5
4
5
5500-6000
5500-6000
0-5
0--5
6
6
84
~84
~0.4
~0.4
1.5-6
1:5-6
To the operator
Thank
you
very
much
for
using our High speed, Straight Needle, Overlock Safety Stitch Machine.
operating
machine.
correct direction
this
machine. please study this book thoroughly. understand the functions
Then
it
ATTENTION:
of
will
help
Because this
motor.
you
to
increase your sewing efficiency
is
an
high speed machine.
How to install the machine
1.
Install
the
enclosed.
IOOmm,and
2. Setting the
3 .
Install
Be
4.
NOTE:
machine according
In
case
of
semi-submerged, the distance between Needle plate top surface
for
fully-submerged
pedal
the
cloth waste chute. thread stand
sure the motor turning direction
The dimensions
is
of
clutch motor
of
motor pulley
about
to
the table
5mm.
to
the
is
How to operate the new machine
Please
run
thereafter
the new machine
the
machine
may
be
operated
in
the ftrst four at 20%less
up
to
left
side
as
parts list.
c.Jockwise.
and
sewing
maximum
cut-out
and
And
speed
speed.
and
quality.
Do
not
run
it
before
filling
diagram, Cushion Rubber
the
pedal
of
the belt can
are
speed
than
presser
shown
maximum.
be
pressed
in
Table I.
foot
Then replace
oil
and
lift
at
inward
and
features
and
making
and
Rest
Table
Top
right ride.
about
the
Before
of
sure
Board
is
about
JOmm.
new
oil
the
the
as
and
Lubrication and drainage
1. Lubrication Fig.l
.
Remove
top
of
Oil
When
needle
holder. guide, upper looper guide etc. Before operating the machine.
2.
Remove
For
been
operating over
This
3.
Screw A
Level
indicator between
the
machine
Drainage
Screw A and
keeping
machine
Fig.l
the
good
four
has
and
ftll
in
enclose
two
is
operated for the ftrst time
drain
out the
lubrication
weeks,
been
And
ftxed
with
high
lines
of
oil
and
machine
after that, change
oil
ftler
speed lubricate oil( or similar
Oil
Level
is
then
replace
life,
, Please clean
Needle Cooling Lubrication-Silicon oil.
Oil
A
Sight'Window. Then replace Screw A.
idle
for a long
Screw
please
oil
every
A.
replace the
four
it
every
time,
months.
month
to
Mobil# I 0,
please
be
new
oil
when
or replace a
sure
to
the
new ·one
Esso#32)
oil
the
new
machine
if
necessary.
until
top
of
the
the
has
Fig. 1 Fig.2
-1-
Threading the machine
Refer
to
the
uneven
sewing type
stitches or skip stitches etc.
For
seamtype
516
you
only
Thread tension
need
for
correct threading.
Any
incorrect threading
For
four
may
thread
cause thread break,
only
Fig. 3 Fig.4
The
thread
tension
length etc. Therefore
case.
l.
Tension Nuts Adjustment Fig.S
The
tension
or
left
The
tension Nut(5)controls the double chain looper thread.
The
tension Nut(2)controls
The
tension Nut(3)controls
The
tension
2. Needle
In
sewing
Note:
Nut(
side overlock needle thread.
Nut(
Thread
case
of
sewing
type
503,505.
The(+)direction
be
the
I )controls
4 )controls
Control Fig.6
type
is
adjusted according to sewing fabric, thickness, sewing thread,
pressure
the
the
the
the I Ower
504,512,&514.
for
of
the
Tension Nuts or Thread Guides
double chain
overlock needle thread.
upper looper thread.
more
needle
needle
looper thread.
push
Thread guide
thread tension ,
3. Looper thread Control Fig. 7
For
line ( -----
In
case of sewing
position
Adjust
sewing type 5
).
as
the
thread guide@ as follow.
12,
when Upper Looper
type
503. &505.
continuous line (
--
).
Point
is
When
A:
for
thread
and
extremely left,
Upper
Looper
stretchy thread
must
be
CD
and®to lowest point, and
the(-)direction
push
take
moves
is
used.
is
up
<Dand
to
lowest. set
for
Fig.
5
seam
width. stitch
adjusted
less
®at
Take
in
each individual
Fig.6
up
to
highest point to
needle thread tension. .
the
position as
up
CD
and
the
chain;.
@)"at
th~·:/
..
'- '
-:l-
Point
B:
for seaming and blind stitch hemming. Point
Adjust Thread
Point D: for stretchy thread
NOTE: The direction
guide@
as follows.
is
used. PointE: for seaming and blind stitch
is
for more thread
in
sewing seam.
4. Chain Looper Thread Cam Control Fig.S
When
the needle moves to
surface ofThread Guide Bracket Q).
Loosen
screw®
and
its
highest position,
adjust the thread
cam@
the
as
Fig. 7 Fig. H
C:
for
seaming type 512.
right corner
clockwise
and
the direction
of
is
late for
hemm
ing.
is
for
less thread
the
Thread Cam ® matchs
timing
of
looper thread cam.
in
sewing seam.
with
the
upper
Stitch length adjustment
The stitch length adjustment
Keep
pushing the Push Button enter deep inside.
Keep
pressing the Push Button and
indicating point
Maxi
diff Machine
ratio type
1
:2
I :3
1:1.3 Serge
1:4
of
Belt
Cover.
Seaming I
Shirring
Special
is
made according
I
0.7
1.6
0.6 0.9
match
2
1.5
I
2.3
to
the sewing fabric. differential
the desired stitch length which
Pulley scale
3
2 2.5 3
1.4
3.1
1.2 1.5 1.8
4
1.7
3.9
5 6 7
2
4.7
is
shown
feed
3.5
2.3
5.4
2.1
ratio etc.
on
the pulley
3.8
2.5
5.9
I
with
the
Fig. 9
Needle replacement
Please
use
DCX27 or equivalent needle size.
Loosen
Screw
Q)
and
remove the old needle.
-3-
Fig.
10
Insert
the needle which long gro0ve
faces
tighten Screw (i).
Differential feed ratio adjustment
you
and
push
it
up
deep into the needle hole until
it
stops
and
The ditlerential teed ratio
when
the
Uthcrcise
Loosen
shrinking
Note:
b~
set
over
I
I
movement
the
fabric
Nut
the
fabric
When
the
of
be
Q)
then turn screw ®
then tighten Nut (D.
the surface
scale
its
Main
shrinked.
ratio can
is
the ratio
feed
of
adjusting level@
be
Scale I 2
1:1.3
-
1:0.7 1:0.9
Ditlere-
I
tHial
Feed
1:2
I
:3
1:0
.7 I :I
1:1
I:
ratio
1:4
I:
1.1
1:1
I
Parts relation and timing
1. Needle and Needle Plate Fig.12
When
the
Needle moves to the highest position.
and
needle plate
10.8-II.Omm
needl
e slot
of
0.::!-0.3mm
point
presser
than left needle.
(right needle if two needle)
foot
is
Slightly loosen Screw
Rotate
the pulley
needle plate. or you
Rotate
~:orrcct
the
needle height
is
9.5-9.7mm
for
high
lift machine.
Needle plate. The right needle must ahead about
And
1.2mm
.
Q)of Needle Drive Crank.
to
check
if
may
loosen screw®and adjust needle holder.
pulley for removing
is
obtained. Tighten screw(!).
of
movements between
dog
is
bigger than differential feed dog. the fabric
in
adjustable
1.5
.6
for
standard
Each
needle
clockwise
up
3
I:
1.4
1:2
I
:2.3
be
to
must
set
I :0.7.
I :I. I
I:
1:2
1:2.8
the
lift
for
stretching the fabric,
at
the
4 5
1.7
.5
distance between needle point (left needle iftwo needle)
machine or
centers
Main
scale®
1:1.3
1:2
I
:3
1:3.3
in
each
the distance between the needle
to
needle slot
needle center
the
needle
of
Needle
in
each
to
the highest position, tap the Needle Holder guide
needl
Plate
e slot
or
of
Feed
Dog and Differential
and
the differential
t\
'15-'1.1
High
Lifl
IOJ~·II
be
stretched
in
reverse direction
feed
ratio
is
feed
in
sewing.
I:
1.
and
Fig.
J7ig.
until
dog,
for
if
ll
12
the
it
2. Upper Looper(Spreader)and Needle Fig.l3
When
the
and
center
Upper (spreader) moves to
line
of
needle
is
4.5-5.0,
the
extremely left, the distance between the point
for
I needle (spreader) to center line
of
left needle
machine.
-4-
of
looper (spreader)
is
5.5-6.0mm for 2 needle
A: 4.5-5.0
8:
5.6-6.0
3.
Lower Looper and Needle Fig.14,
When
the
lower
looper
left.
the
distance
of
needle
(left
lift
machine.
center
line
between
4.
upper
the gap A
moves
and
5.
center
between
When
between
0.15-0.2mm.
6.
position
moves
needle
Upper Looper and Lower Looper Fig.16
When
looper
is
to
the
front
Needle
Needle and needle Guard Fig.17
When
line
ofNeedle(Ieft needle
Needle
Needle
Needle
Chain Looper and needle Fig.18
The
Chain
of
the
extremely
needle
When
of
needle
and
the
Upper
is
as
O.Smm,
lowest
the
Lower
moves
the
between
if2
the
(left needle if 2 needle) the
looper
and
near
the
position. the gap
guard
and
rear Needle
to the
and
Looper
holder
left,
moves
looper
needle)is 3.4-3.6mm
lower
is
0-0.0Smm.
Lower
as
possible
gap B
point
looper
Looper
is
0.2mm.
to
to
and
the
between
B if 0.1-0.2mm.
Looper point
lowest
front Needle
must
be
and
when
the distance
is
if2
needle).
Guard A is
position, the
fixed
into
the
between
the
moves
is
lower
When
opposite the
guard
Chain
15
extremely
center
for
to
crossed,
looper,
Needle
Needle
The
Oram,
B if
the
lowest
Looper
the
line
high
the
gap
the
gap
gap
looper
point
and
~
center
Fig.
Fig.
line
14
8
0
I
0
• I
15
of
needle
0
is
2.Smm.
Fig. 13
0.0
A
0.5
Fig.
16
A\
r 0.1..().20
~
ccdlc
f///lZ"\~
-a
~b
A
Fig.
f
17
-5-
2.5
Fig.
18
Problem settlement:
Needle
break
REASON
I . Needle installed wrong.
2. Wrong needle size.
3.
Needle is bended.
4.
Wrong relation with Needle Guard.
5.
Wrong relation with looper.
6.
Needle does not center the needle.
Slot
of
Thread
Needle
break
Plate
or
Presser Foot.
REASON
I.
Inferior quality
2. Thread thicker than Needle hole.
3.
Wrong threading.
4.
Thread tension is too strong.
5.
Needle installed wrong.
6. Thread Stand installed wrong.
7. Over heat
(2 )Wrong setting
8.
Thread Disc
9.
Wrong relation
10. Needle . Looper needle Plate and guide
is burred.
of
thread.
ofNeedle:
of
Needle Guard
or
Guide is burred.
of
Needle
(J)NO silicon oil
and
Looper.
Skip stitches
REASON
1. Wrong relation
2.
Wrong threading.
3.
Needle installed wrong.
4. Inadequate thread tension
too strong.
5.
Looper point is damaged.
6.
Needle is bended.
7. Wrong installed needle Guard .
ofNeedle
and Looper.
or
tension
Loosen stitches
REASON
I . Wrong threading
2. Thread is thicker than Needle
hole.
3.
Tension Disc do not press thread
properly.
4.
Needle thread is not 1 ubricated.
5. Wrong setting
Loopers.
ofNeedle
and
CORRECT
1. Reset needle correctly.
2.
Use properly needle for fabric and thread.
3.
Replace new needle.
4.
Readjust Needle guard.
5.
Readjust looper.
6.
Readjust the Needle Plate and Presser Foot.
CORRECT
I. Use good quality thread.
2.
Use proper Needle for fabric and thread.
3.
Rethreading correctly.
4.
Readjust thread tension nut.
5. Reset needle correctly.
6. Reset thread stand for threading smoothly.
7.
(l)FillinSiliconeoil.
(2)Readjust Needle Guard.
8.
Gring
off
polish
or
replace new one.
9. Readjust Needle and Looper.
10. Grind .
off
, polish
or
replace new one.
CORRECT
I.
Readjust Needle and Looper.
2. Rethreading correctly.
3.
Reset Needle correctly.
4.
Readjust Thread Tension Nut.
5. Replace new
6.
Replace new one.
7.
Readjust Needle guard.
one.
CORRECT
I.
Rethreading correctly.
2.
Use proper Needle.
3.
Reset Tension Disc properly.
4.
Fill silicon oil.
5.
Readjust needle and loopers.
Uneven stitches
REASON
I.
Wrong
2. Thread stand installed wrong.
Lower
3.
Khives
4.
(I
(2)Dull
5. Thread Disc or Guide
6. Needle point
7.
8. Inadequate thread tension.
threading.
Knife
installed wrong.
do
not
trim
)Knives
Inadequate height
installed wrong.
lower
knife.
is
damaged.
neatly.
in
of
feed dogs.
burred.
CORRECT
Wrinkled stitches
REASON
I . Thread tension
2. Inadequate pressure
3. Inadequate height
Knives
4.
5. Differential
6. Needle
Seam
7.
the
do
is
width
chain
is
too
strong.
of
of
feed
not
trim
neatly.
feed
is
not matched.
too
thick.
is
too narrow against
of
finger
of
Needle plate.
presser foot.
dogs.
Thread chain does not come out smoothly
REASON
I.
Pre
sser
foot
installed wrong.
2. Inadequate timing
3.
Double
4.
Wrong
5.
Inadequate or
6.
Wrong
7. Needle Plate Thread Disc or Presser
is
8.
Thread tension disk
chain looper installed wrong. 3.
threading. 4. Rethreading correctly.
relation ofNeedle
burred.
of
looper thread cam.
too
strong thread tension.
and
is
rough.
looper.
foot
I .
R.:thread
2. Reset Thread
3. Readjust
4. Correct
(I
(2)Sharpen or replace
5. Gring
6. Replace
Readj
7.
8. Readjust Thread tension nut.
ing correctly.
for
threading smoothly.
!Ower
knife.
as
follow
:
)Readjust Knives.
off,
Polish or replace
new
Needle.
ust
feed
dogs.
new
knives.
new
CORRECT
I . Readjust thread tension nut.
2. Readjust
3. Readjust
4. Readiust knives or sharpen knives.
Readjust
5.
Use
6.
7. Readiust
finger.
Presser foot pressure.
feed
dogs.
differential
proper Needle
seam
for
width
feed
ratio.
fabric
and
or replace the chain
CORRECT
Reset
I.
2.
5. Readjust Thread tension
presser
Readjust
Reset
Double
6. Readjust Needle
7.
Gring
off,
8.
Polish thread tension disk.
foot
correctly
Looper thread Cam.
chain looper co
nut.
and
looper.
polish or replace
rrectl
new
one.
thread.
or
y.
one.
-7-
A,
Frame
assemblies
_______
-8-
. . .
_____..
. . .'
. .
.. -
. -·
~
-
...
' ..
~·
-
.
.
·
·~
.,.
. -
~
. .
..
. -
A,
Frame
Ref.NC
1
2
3
4
5'
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22 Ml-22
23
24
25
26
27
28
1
2
.
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Part
MI-lA
M1-2
Ml-3A
Ml-4A
M1-5A
Ml-6
Ml-7
Ml-8
M1-9
Ml-10
MI-ll
Ml-12
Ml-13
Ml-14
Ml-15
Ml-16
M1-17
M1-18A
M1-19
M1-20
Ml-21
Ml-23
Ml-24
Ml-25
M1-26
M1-28
All-29
S064
S065
S0
54
S061
S009
son
S04l
N03
S032
S036
S081
Wl4
W03
S080
S044
S065
assemblies
NO.
machine
needle thread cover
upper knot cover
upper knot cover
lather
needle
upper washer
oil
rear
oil
rear
rear
oil
cover
oil
cove~
rivet
machine
model
pin
oil
snap ring
oil
oil
begin pin
trade
mard
oil
screw
screw
needle bar bushing screw
needle
needle thread cover
needle thread cover
main
main
rear
lower cover
oil
washer
elasticity
nexagon
screw
screw
frame
shell
plate
tube
oil
adhesive case
seal
cover
cover
seal
sear
washer
washer
modle
tube
screen
seal
I
seal
II
mark
plate
amount
lind
cover bearing regulate screw
cover bearing reg
cover
pan
join
socker screw
Name
plate
pad
upper knot
oil
seal
plate
plate
adjusting pin
set
serew
plate
plate
ulat
plate
plate
screw
washer
top
set
e nut
silk
screw
A.mt.
Req.
3~
1
1
1
4~
I I
I 1
I I
1 I
1 1
1
1
1
I I I
I
1
I I
1
1
I I
1
4
I
1
2
1
1
1
I
I I
1
I I
I
1 I
I I
I I
4
1 I
1
2 2
I
I 1
1 1
1 1
4
1
1 I
1
4
3
2
1
1
I I
1
1 1
11
4
I I
I I
4
3 3
2 2
I I
I I
I
II
2 2
4
4
4
4
I
1
4 4
4
4
4 4
I
I I
5~
I
I
I
1
I
I
I
4
I
1
1
4
I
4
I
I
I
11
2
4
4
I
-9-
B,
Cloth
8,__...,
plate
assemblies
-10-
B,
Ref.
2
3
4
5
6
7
8
9
10
11
12
13
1
2
3
4
6
6
7
8
9
10
11
Cloth
NO
M2-l
1
5M2-I
M2-2
111-3
M2-4
M2-5
M2-6
M2-7
M2-8
M2-9
M2-10
5M2-10
M2-11
M2-12
M2-13
S037
S049
SOlO
N03
S083
Wll
N01
W08
S012
S099
W07
plate
Part NO.
assemblies
Name
cloth
plate
cloth
plate
washer
colloid
colloid
cloth
spring
cloth
cloth
cloth
cloth
cloth
washer
upper looper
upper looper
upper looper
set
serew
set
screw
screw washer
screw nut
washer
big cover spring screw
big cover
big cover join screw washer
cose
cose
plate
spring screw
plate
spring
plate
slider
plate
cover spring
plate
lower
plate
lower·
sealing
sealing
sealing
screw
nut big cover
join
screw
cover
plate
plate
plate
plate
plate
stable
screw
washer
screw
Amt.
3~
1
0
1
4
1
1
1
1
1 1
1
1
0
I
1
1
3
I
2
2
1
I I
1
2 2
2
3 3
3
Req.
4~
1
0 0
1
4
1 1
1
1
I 1
1 1
1
0
1 1
1 1
1
3 3
l 1
2 2
2
1
1
2
3
5~
1
1
4
1
1
1
1
0
1
2
1
1
1
2
2
3
3
-11-
c,
Cover
asse
mblies
=----
-1
2-
C,
Cover assemblies
Ref.
NC
Part
NO.
1
M3-l
2
M3-2
M3-3
3
4
jM3
-4A
5
M3-5
M3-6
6
7
M3-7
M3-8
8
9
M3-9
10
M3-10
11
M3-11
5M3-ll
12
M3-12
13
M3-13
14
M3-14
M3-15
15
16
M3-16A
17
M3-17
M3-18
18
M3-19
19
20
M3-20
21
M3-21
22
M3-22A
23
M3-23A
24
M3-24
25
M3-25
26
M3-26A
1
S098
2
~091
S017
3
Wl7
4
S032
5
6
S020
S090
7
R
S082
9
S027
10
S024
Wll
11
12
E02
Name
upper cover
upper cover washer
thread guide supporter
belt
cover
thread covet· spring
cloth
guide
plate
oil
guide
II
pin
front
spring
frong cover
front
cover guard
front
cover guard
front
cover hinge
hinge pin
front
cover hinge spring
front
cover hinge washer
trade
mark
plate
oil
flow
window
front
cover snap guard
oil
guard I
oil
sight
gauge
washer
pin
oil
cover
gauge
cover
oil
sight
washer
trade
mark
plate
upper cover
upper cover screw
thread guard screw
upper cover spring screw
washer
cloth
guide
plate
screw
oil
guard screw I
snap
plate
screw
front
cover
plate
block
front
cover hinge screw
front
cover hinge washer
snap uing
spring
screw
Amt.
3~
1 1
I 1
I
I
I I
1 I
1 I
1
1
I
I
0
I
1 1
I I
I
I
2 2
I
1
I
1 I
I I
1
1
1 1
1 1
4
2
3
2
5 5
2
4
3 3
2
3 3
3 3
1 1
Req.
4~
I I
I 1
1
I I
I I
I 0
0 I
1 I
I
1 I
1 1
I 1
1 I
1
1
4
2
3
2
2
4
2
5~
I
I
I
I
I
I
I
I
I
2
I
1
I
I
I
I
4
2
3
2
5
2
4
3
2
:l
3
I
-13-
D,
Main
shaft
assembl.
1es
-14-
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