HIGHLEAD GC0318-1A User manual

HIGHLEAD
Purchasing Dept
Copy
GC0318-1A/GC0318-1H/GC0318-1B
TOP AND BOTTOM FEED LOCKSTITCH
SEWING MACHINE
Instruction Manual
Parts Catalog
SHANGHAI HUIGONG N0.3 SEWING MACHINE FACTORY

CONTENTS
I.Instruction Manual
l. MAIN SPECIFICATIONS ................................................................................................. 2
2. INSTALL THE MOTOR ................................................................................................... 2
3. CONNECT THE CLUTCH LEVER WITH THE PEDAL ............................................................ 2
4 PREPARATION AND LUBRICATION
................................................................................. 3
5. REPLACE NEEDLES ...................................................................................................... 3
6. NEEDLE, THREAD AND MATERIAL TO BE SEWN .............................................................. 4
7. RUN-IN OPERATION .................................................................................................... .4
8. THREADING ............................................................................................................... 5
9. WINDING ADJUSTMENT ............................................................................................... 6
I
0. SET STITCH LENGTH AND REVERSE FEEDING ................................................................. 7
11. POSITION PRESSER BAR ............................................................................................... 7
12. ADJUST THE PRESSURE OF PRESSER EOOT ..................................................................... 8
I
3. ADJUST THREAD TENSION ........................................................................................... 8
14. ADJUST THREAD TAKE-UP SPRING ................................................................................ 9
15. ADJUST THREAD GUIDE AND THREAD TENSION ............................................................ 1O
16. TIME NEEDLE TO ROTAING HOOK ................................................................................ 11
I 7. REPLACE ROTATING HOOK. ......................................................................................... 12
18. ADJUST THE HEIGHT OF FEED DOG .............................................................................. 12
19. ADJUST THE POSITION OF FEED DOG ........................................................................... 13
20. TIME FEED MOTION TO NEEDLE MOTION ..................................................................... 13
21. ADJUST OPENING TIME OF THE TENSION DISCS ............................................................ 14
22. LUBRICATION ADJUSTMENT ....................................................................................... 15
23. REGULAR CLEANING ................................................................................................. 16
2.Parts Catalog
A ARM BED AND ITS ACCESSORIES ................................................................................... 17
B. NEEDLE BAR AND TAKE-UP, ARM SHAFTAND VERTICAL SHAFT MECHANISM .................... 20
C. STITCH REGULATOR MECHANISM .................................................................................. 23
D. FEEDING AND FEED LIFTING MECHANISM ....................................................................... 25
E. PRESSER FOOT MECHANISM .......................................................................................... 27
F. PRESSER LIFTING, FEEDING MECHANISM ...................................................................... 29
G LUBRICATION MECHANISM ........................................................................................ 32
H. OIL RESERVOIR AND OTHERACCESSORIES ..................................................................... 34
-1-

1. MAIN SPECIFICATIONS
Item GC0318-1A GC0318-1H GC0318-18
Max. sewing speed ( spm)
2000 2000 2000
Needle ti ti ti ti
DPX 17
18 -22
DPX5 14 DPX 17
25
Needle bar stroke
(mm)
35 35 35
Lubrication Automatic Automatic Automatic
Stitch length C mm)
0-10
0-5 0-10
by hand (mm)
6 6 6
Presser fool lift by knee
(mm)
13 13 13
2.INSTALLTHE MOTOR ( Fig.1 )
Align Motor Pulley Groove ( B ) and Balance Wheel Groove ( A ) by moving the motor leftward or
rightward.
Fig. 1
L-----C
3. CONNECT THE CLUTCH LEVER WITH THE PEDAL ( Fig.2 )
1) The optimum tilt angle of pedal ( A) is approximately 15 deg.
2) Adjust Clutch Cover ( D ) so that Clutch-Lever ( C ) and Draw Bar ( B ) run in line.
3) The balance wheel should rotate counter-clockwise when viewed from the outside of Balance
Wheel ( G). The direction of the motor pulley rotation can be reversed by reversing (turning
over 180 deg . ) the power plug of the motor. .---------------------.
4) Adjust the tension of V-bel t ( F ) by
turning Motor Vertical Position Screw ( E ).
The proper tension of the V-belt is a slack
of 10-20mm when the belt is depressed at
the center of the belt by finger.
Fig.2
-2-
D---~~'
c--~.
B---¥,,.....
A-~~~
x

4. PREPARATION AND LUBRICATION ( Fig.3)
1) Cleaning the machine
Before leaving the factory, the machine parts are coated with rust-preventive grease, which may be
hardened and contaminated by dust during storage and shipment. This grease must be removed with gasoline.
2) Examination
Though every machine
is confirmed by strict inspection and test before leaving the factory, the machine
parts may be loose or deformed after long distance transportation with jolt. A thorough examination must be
performed after cleaning the machine. Turn the balance wheel to see
if there is running obstruction, parts
collision, uneven resistance or abnormal noise.
If these exist, adjustment must be made accordingly before run-in
operation.
3) Oiling
(I) Required amount of oil.
Line (
A) on the oil reservoir: Max. oil level.
Line ( B )
on the oil reservoir: Min. oil level.
lf oil level goes down under line ( B ),
oil cannot be distributed
to each part of the machine,
thus causing the parts a seizure.
(2) Replenishing
Always use only No.18 special machine oil
for high speed sewing. Be sure to replenish oil to
Line ( A ) before starting operation.
(3) Replacing oil
A B c
Fig.3
To replace oil, remove Screw ( C ) to drain oil. After completely draining off oil, clean the oil reservoir and
securely tighten Screw ( C ), then fill the reservoir with fresh oil.
5. REPLACE NEEDLES ( Fig.4)
Tum the balance wheel to lift needle bar to the upper end of its stroke. Loosen Needle Clamp Screw 1.
While keeping the long groove of the needle leftward fully insert the needle shank up to the bottom of the needle
socket. Then tighten Needle Clamp Screw
A.
Note Fig. ( b ): insufficient in~ertion.
Fig. ( c ): wrong direction oflong groove.
x x
I
/'
a
Long groove b c
Fig.4
-3-

6. NEEDLE, THREAD AND MATERIAL TO BE SEWN
Needle Size Thread Number Material
No.14 No.60-No.65 cotton, Woolen
No.16 No.30-No.50 Muslin,Woolen,Tarpaulin,Thin Leather
No.22 Mediumleather,Canvas
7. RUN-IN OPERATION (Fig. 5)
Run-in operation is required for a new sewing machine, or a sewing machine left out operation for a
considerable length of time.
1) Remove Red Rubber Plugs (A) on the top of the armand replenish sufficient amount of oil.
2) Lift Presser Foot ( B ).
3) Run the machine at a low speed ( 2000-2500spm) to check oil distributing condition through Oil Check
Window ( C ).
4) Perform run-in operation at 2000-2500spm for 30minutes. After a lapse of one month of service during
which the working speed is increased gradually and the machine runs sufficiently well, the high speed 5000spm
can be adopted according to the nature of the work.
Fig. 5
-4-

8. THREADING ( Fig.6)
To thread the needle thread, raise needle bar to the upper end of its stroke, lead the thread from spool and
perform threading
as shown in Fig.6 . To dra\V the bobbin thread, hold the end of the needle thread and turn the
balance wheel
to lower the needle bar and then to lift it to its highest position. Pull the needle thread and the
bobbin thread is drawn
up. Put the ends of needle thread and bobbin thread frontward under presser foot.
l
'. 6
;lg.
-5-

9. WINDINGADJUSTMENT ( Fig.7)
1) The wound bobbin thread should be neat and tight, if not, adjust the winding tension by turning Tension
Stud Nut (A) of bobbin winder tension bracket.
Note: nylon or polyester thread should be wound with little tension, otherwise, Bobbin ( D ) might break or
deform.
2) When the wound thread layer does not present a cylindrical shape as shown in Fig.7 ( a), loosen Set
Screw ( B ) of bobbin winder tension bracket and slide Bracket ( C ) leftward or rightward. If thread is wound as
shown in Fig.7 ( b ), move the bracket rightward, but if thread is wound as shown in Fig.7 ( c ), move the bracket
leftward.
After adequately positioning the bracket, tighten Set Screw ( B ).
3) Do not overfill the bobbin. The optimum length of thread will fill about 80% of bobbin capacity. This can be
adjusted by Adjusting Screw ( E) of bobbin winder stop latch.
--~
A,-------.
I
B-------
-
~
~
m
a b c d
Fig. 7
-6-

10. SET STITCH LENGTH AND REVERSE FEEDING ( Fig.8)
1) Stitch length can be set by turning Dial ( A).
2) The figures on Face ( B ) of dial show stitch length in nnn
3) Reverse feeding starts when Reverse Feed Lever ( C ) is depressed, and the machine will feed forward
again
if Reverse Feed lever ( C) is released.
..--~~~~~~~~~~~~~---,
Fig.8
11.POSITION PRESSER BAR ( Fig.9)
1) Loosen lock Nut ( E) and Pressure Regulating Thumb Screw (A).
2) Remove rubber plug from Face Plate ( B ).
3) Loosen Screw ( C ) and adjust the position of Presser Bar ( D ) till the presser foot is 6 mm above the
throatplate will the presser foot lifted to its highest.
4) Tighten Screw (
C) and put in the rubber plug.
5) Tighten pressure Regulating Thumb Screw
(A) and Lock Nut ( E ).
Fig.9
-7-

12. ADJUST THE PRESSURE OF PRESSER EOOT ( Fig.10)
Pressure of presser foot is to be adjust in accordance with thickness of materials to be sewn.
First loosen Lock Nut ( A
). For heavy materials, turn the pressure regulating thumb screw as shown in
Fig.10 ( a) to increase the pressure, while for light materials, turn the pressure regulating thumb screw as shO\vn
in Fig. I0 ( b ) to decrease the pressure. Then tighten Lock Nut (A).
The pressure of presser foot is recommended to be less as long as normal feeding is ensured.
a b
Fig. 10
13. ADJUST THREAD TENSION ( Fig.11,12)
In principle, thread tension is to be adjusted in accordance with materials, thread and other factors.
In practice, thread tension is adjusted according to the stitches obtained. The needle thread tension should
be adjusted with reference to the bobbin thread tension. Tum Tension Spring Regulating Screw (
A) of bobbin
case clockwise for more tension, or tum the screw counter-clockwise for less tension.
It is common practice to test the bobbin test the bobbin thread tension as shown in Fig.12 . Hold the end of
the thread from delivery eye. If the bobbin case is falling slowly, the proper tension is obtained. The needle
thread tension can be adjusted by setting ( I ) the take-up spring tension. ( 2 ) the thread take-up spring stroke
and ( 3 ) tension spring. All these adjustments will be described in the following.
~--------------~
/
Fig. 11
Fig. 12
-8-

14. AD.JUST THREAD TAKE-UP SPRING ( Fig.13,14)
1) Adjusting the thread take-up spring tension
Loosen Set Screw ( A ), turn Tension Stud ( B ) clockwise to increase the spring tension, or turn the stud
counter-clockwise
to decrease the spring tension. After the adjustment, be sure to tighten Set Screw ( A). The
thread take-up spring tension should
be about 30g. To Attain this. First loosen Set Screw (A), turn Tension Stud
( B ) counter-clockwise
to decrease the tension of Thread Take-up Spring ( C ) to zero, then turn Tension Stud
( B ) clockwise until Spring ( C ) comes
to the notch of thread tension regulating bushing, and again turn Tension
Stud ( B ) halfway back ( counterclockwise ) After
the adjustment. Tighten Set Screw (A).
Fig. 13
2) Adjusting the thread take-up spring stroke
Loosen Set Screw ( B
), turn Stud ( C ) clockwise to increase the stroke or turn Stud ( C )
counter-clockwise
to decrease the stroke. After the adjustment, tighten Set Screw ( B ).
Before leaving the factory, the thread take-up spring has properly been adjusted. Readjustment is needed
only
in the case of special material or special thread.
r-~~~~~~~~~~~~~~~~~~----,
Fig. 14
-9-

15. ADJUST THREAD GUIDE AND THREAD TENSION ( Fig.15,16)
The position of the thread guide affects stitch tightness and therefore must be adjusted according to sewing
materials and sewing conditions.
l 2 3
Thread guide position Leftward Center Rightward
Material weight Heavy Medium Light
Figl5 shows different stitch fonns. Normal stitch fonn should be as
shmvn in Fig.15 ( a ). When abnormal stitches cause puckering
and thread break-age, the tension
of needle thread and bobbin
thread must
be adjusted accordingly.
Fig. 15
a
b
c
d
e
l) In case needle thread tension is too strong or bobbin thread tension is too weak, as shown in Fig.15 ( b ), tum
the thumb nut counterclockwise to decrease the needle thread tension,
or tighten the tension spring regulating
screw of bobbin case to increase the bobbin thread tension ( Sec Fig.16 )
2)
In case needle thread tension is too weak or bobbin thread tension is too strong, as shown in Fig.15 ( c ), turn
the thumb nut clockwise to increase the needle thread tension, or loosen the tension spring regulating screw
of
bobbin case to decrease the bobbin thread tension.
3)
In case of the stitch forms as shown in Fig.15 ( d) and ( e ), adjustments can be made with reference to the
above means.
•
Fig. 16
-IO-

16. TIME NEEDLE TO ROTAING HOOK ( Fig.17,18,19,20)
A. Adjusting the needle position (See Fig.17)
I) Turn balance wheel by hand to bring Needle Bar ( C ) to the lowest position of its stroke.
2) Remove rubber plug from Face Plate
(A).
3) Loosen Set Screw ( B) of needle bar adaptor.
4)
Move Needle Bar ( C) vertically to adjust needle timing.
5) After the adjustment, tighten Set Screw ( B ) and put in the rubber plug. The standard needle timing ( See
Fig.18 ) is to align Timing Mark ( B ) on the needle bar and the bottom of Needle Bar Bushing ( A ) and
meanwhile align the Inner Surface ( E)
of the hook and the center of Needle Eye ( D ) when the needle bar gets
down to its lowest position.
Fig. 17
Fig. 18
B. Adjusting the hook point timing
Timing
of needle motion to rotating hook motion has a great effect on sewing performance. The standard
hook point timing ( See Fig.19 ) is to align Hook Point ( D ) and Needle Centerline ( C ) when Needle Bar ( B )
is lifted by 2.2mm from the lower end of its stroke. Besides, Hook Point ( D ) should be 1.0-1.Smm above the
upper end
of needle eye ( E ).
When adjusting the hook point timing, also notice that the clearance between the bottom of needle notch
and Hook Point (
C) should be approK 0.05mm ( See Fig.20)
0.05mm
Pig. 19
Fig.20
- 11 -

17. REPLACE ROTATING HOOK ( Fig.21 )
l) Lift needle bar to the highest position of its stroke.
2) Remove throat plate, take down needle and bobbin case.
3)
Loos.en Screw ( C ) of hook positioner and take down Hook Positioner (A).
4) Loosen two Screws ( D ) of rotating hook.
5) Tum balance wheel to raise feed
bar to its highest position, then take down the rotating hook by turning it
avvay from feed bar.
6) Installing the hook can be done in reverse sequence. Note that Needle ( B ) and the convex surface
of
Hook Positioner (A) should align with a clearance of 0.5-0.7mm between them.
0. 5-0. 7mm
Fig. 21
18. AD.JUST THE HEIGHT OF FEED DOG ( Fig.22,23 )
l ) Tum balance wheel until feed dog is lifted to its highest position from throat plate surface.
2) Loosen Screw
(A) of feed lifting rock shaft crank right ( See Fig.22,b )
3) Move Feed Bar (
B) in the direction shown by the arrow in Fig. 22 (a) to adjust the height of the feed
dog. The standard height of feed dog is that the top of feed dog is 1mm above Throat Plate Surface ( B )
4) After the adjustment, be sure to tighten Screw (A).
a b
Fig.22 Vig.23
-12-

19. AD.JUST THE POSITION OF FEED DOG ( Fig.24,25)
The standard position of feed dog is that the clearance behveen the front end of the throat plate slot and the
first tooth
of the fully advanced feed dog is 1mm, as shown in Fig.24.
I) Fully advance the feed dog tO\.vard the front end of the throat plate slot.
2) Loosen Feed Rock Shaft Crank Screw
(A). See Fig.25 ( b ).
3) Move Feed Bar ( B) in the direction shuwn by the arrow in Fig. 25 (a) to adjust the feed dog position.
4) After the adjustment, be sure to tighten Screw
(A).
a b
Fig. 24
Fig. 25
20. TIME FEED l\!IOTION TO NEEDLE MOTION ( Fig.26,27,28)
The standard timing of feed motion to needle motion is that the top of feed Dog ( C ) is flush with Throat
Plate Surface ( B) when the point of Needle (A) reaches Throat Plate Surface ( B ). See Fig.26.
~
(cr----.:..----
'---
Fig. 26
Fig.27
Ir feed motion 1s not timed to needle motion, adjust as follows ( Sec Figs.27 and 28 ).
IJ RcmO\ c 1\rm Side Cover .
2) Loosen Set Screws ( A ) and ( D ) of feed and feed lifting eccentric.
3)
Hold feed and Feed Lifting Eccentric ( B) and turn Balance Wheel ( E) slowly until the upper edge of
.-\rm Shaft Oil Hole ( C ) aligns with the lower edge of Reference Hole ( G ) of feed and feed lifting
ccccntnc
- 13 -

4) Leave a clearance of 0.3-0.5mm between Feed and Feed Lifting Eccentric ( B ) and Eccentric Sleeve
( H ), then tighten Set Screws (A) and ( D ).
0.3-0. 5mm
®---
(0\--- _..;
~',/
"·
(
Fig.28
21. ADJUST OPENING TIME OF THE TENSION DISCS ( Fig.29)
within the presser foot lift range of 2-7mm opening time of the tension discs can be adjusted as follows:
I) Remove the rubber plug from the back of arm and loosen Screvv (A) of knee lifter lever ( left ).
2) Move the tension releasing cam leftward for earlier opening or rightward for later opening. It will facilitate
the adjustment to put under the presser foot a block as thick
as the presser foot lift.
3) After the adjustment fully tighten Screw (A).
'-----Cam
Fig.29
- 14 -

22. LUBRICATION ADJUSTMENT ( Fig.30)
A Adjusting oil pump.
ln ordinary operation, adjustment is ndt required for the oil pump.
If oil splashing does not occur in the oil
check window
\Vhen the machine runs at a low, speed ( approx.2000spm ), reduce the clearance of the by-pass
hole.
B. Adjusting the lubrication of rotating hook.
The lubrication
of the rotating hook can be adjusted by Oil Adjusting Screw (A) as follows:
I) Turn Oil Adjusting Screw ( A ) clockwise lo increase oil and turn Oil Adjusting Screw ( A )
counterclockwise to decrease oil.
2) Oil Adjusting Screw ( A) adjusts oil amount within 5 turns. When Oil Adjusting Screw ( A) is fully
tightened, oil amount is maximum.
3) Readjustment depends on temperature, sewing speed
and the like. In practice, oil amount can be judged
as follows: remove the throat plate and place a piece of paper on instead, run the machine for about 20 seconds,
then check the oil splashed on the paper.
A
Fig.30
- 15 -

23. REGULAR CLEANING ( Fig.31,32,33)
l) Cleaning feed dog ( See Fig.31 )
Remove the throat plate and clear offthe dust and lint between feed dog tooth slots.
Feed dog
Hook
Feed bar
Fig.31 I
~,. 32
lg.
2) Cleaning rotating hook (Sec Fig 32)
Swing out the machine head and clean the hook. Wipe the bobbin case with soft cloth.
3) Cleaning oil pump, screen (See Fig.33)
Swing out the machine head and clear offthe dust and dirt on oil pump screen.
Screen
Fig.33
-16-

A. ARM BED AND ITS ACCESSORIES
47 36
5
44
40
41
42
43
~~~o 1112 48 49 so
17
38 18
19
20
33
29
36-6
30
28
23
3127
26
-17-
25
32
24
•
$
----44
2
6
"'-)

A. ARM BED AND ITS ACCESSORIES
<t:
::c:
co
---
Fig.
I I I
Part No.
Description
CX) CX)
CX)
-
,.....,
,.....,
Remarks
No.
M M M
0 0 0
u u u
0 0 0
AOl
HM30788001
Arm
1 1
AOl HN20888001
Arm
1
A02 HM30988001 Trade mark plate
1
A02
HN20788001
Trade mark plate
1
A02
HN10588001
Trade mark plate
1
A03
H924025050
rivet
6 6 6
G8/T827
¢2.5X5
A04
H005008060
Spring washer 3 3 3
G8/T 93
6
A05 H200580065 Face plate
1 1 1
A06 HA30680674
Rubber plug ( <P 11. 8 ) 3 3 3
A07
HA60780671
Thread guide on face plate
1 1 1
A08 HA10680676 Thread guide screw 1 1 1 SM9/64(40) X6
A09 HA70082030
Face plate screw 2 2 2
SMl 1/64 (40) X 20
AlO
HA30082170
Screw group 4 4 4
All
H602888001
Arm side cover 1 1 1
A12 H602988001
Gasket for arm side cover I I 1
A13 H121080671 Check window
I 1 I
A14
H603088001
Rubber plug ( <P 22 ) 1 1 1
A15 HA1!280691 Screw type tension stud
I 1 I SMl 1/64 (40) X 16
A16 HAI 1280692
Spring for pre-tension
1 1 I
Al7 HA11280693 Disc for pre-tension
2 2 2
AIB
HA11280694
Spacer for pre-tension
1 1 1
A19 H007013030 Stop ring
I I 1 G8/T 896 3
A20
HAI 1280695
Pre-tension thread guide 1 1 1
A21
HA!0082100 Three-hple thread guide 1 1 1
A22
HA100821!0 Set screw 1 1 1
SMl 1/64 (40) x 5.
5
A23 HA11580701 Thread tension stud
1 1 1 SMI/4(40) X 17
A24
HA31080701
Oil thumb nut
1 I 1
A25 HA50580671 Thread
tension spring
I 1 1
A26
HA31080702
Thread tension releasing disc
1 1 1
A27
HA31080705 Thread
tension disc
2 2 2
A28
HA50580672 Thread take-up spring
1 1
A28 HN10688001 Thread take-up spring
1
A29 HA31080703 Thread tension regulating bushing 1 1 1
A30
HA11580708 Set screw 1 1 1
SM9/64 (40) X4
A31 HA11580709 Thread tension releasing pin
1 1 1
A32
HA11587010 Stop disc
1 1 1
A33 HA11587011
Rubber ring
1 1 1
A34 HA30082080 Set screw 1 1 1
SM15/64 (28) X ti. 8
A35 HA600B2050 Thread guide at arm center
1 1 1
A3ti HA300B2090
Rubber plug ( <P 8. 8 ) 2 2 2
A37 HA300B2100 Rubber plug ( <P 27 ) 1 1 1
A38 HA300B2110
Red rubber plug (
<P 5. 7 ) 2 2 2
A38 HA30082110 Red rubber plug ( <P 5. 7 ) 2 2 2
-18-