HIGHLEAD GC0318-1A Instruction Manual

HEAVY DUTY TOP AND BOTTOM FEED
LOCKSTITCH SEWING MACHINE
GC0318-1A series
Instruction Manual
Parts Catalog
S
HANGHAI BIAOZHUN HAILING SEWING MACHINERY CO., LTD
.

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CONTENTS
1.Instruction Manual
1. 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, THREADAND MATERIAL TO BE SEWN……………………………………………………..4
7. RUN-IN OPERATION………………………………………………………………………………………..4
8. THREADING…………………………………………………………………………………………………5
9. WINDING ADJUSTMENT…………………………………………………………………………………..6
10. SET STITCH LENGTHAND REVERSE FEEDING………………………………………………………..7
11. POSITION PRESSER BAR…………………………………………………………………………………..7
12. ADJUST THE PRESSURE OF PRESSER EOOT……………………………………………………………8
13. ADJUST THREAD TENSION……………………………………………………………………………….8
14. ADJUST THREAD TAKE-UP SPRING……………………………………………………………………..9
15. ADJUST THREAD GUIDE AND THREAD TENSION…………………………………………………...10
16. TIME NEEDLE TO ROTAING HOOK……………………………………………………………………..11
17. 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 OTHER ACCESSORIES……………………………………………………...…... 34

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1. MAIN SPECIFICATIONS
1) Sewing material: Light-Medium material
2) Max. sewing speed: 2000 spm.
3) Stitch length: 0-10mm.
0-5mm
4) Needle bar stroke: 35mm.
5) Presser fool lift: 6mm (by hand) 13mm (by knee ).
6) Needle: DP×17 No.18-No.22
DP×5 No.14-No.18
7) Lubrication: Automatic
8) Reverse feeding mechanism: Have
2.INSTALLTHE MOTOR ( Fig.1 )
Align Motor Pulley Groove ( B ) and Balance Wheel Groove ( A ) by moving the motor leftward or
rightward.
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-belt ( 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.1
Fig.2

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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
(1) Required amount of oil.
Line ( A ) on the oil reservoir: Max. oil level.
Line ( B ) on the oil reservoir: Min. oil level.
If 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
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 )
Turn 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 insertion.
Fig. ( c ): wrong direction of long groove.
Fig.3
Fig.4

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6. NEEDLE, THREAD AND MATERIALTO 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 Medium leather,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 arm and 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

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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 draw 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.
Fig.6

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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 byAdjusting Screw ( E ) of bobbin winder stop latch.
Fig.7

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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 mm.
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.
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
throat plate 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.8
Fig.9

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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 shown
in Fig.10 ( 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.
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. Turn Tension Spring Regulating Screw ( A ) of bobbin
case clockwise for more tension, or turn 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 ( 1 ) 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.10
Fig.11 Fig.12

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14. ADJUST THREAD TAKE-UPSPRING ( 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 ).
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.
Fig.13
Fig.14