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

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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.
1 2 3
Thread guide position Leftward Center Rightward
Material weight Heavy Medium Light
Fig15 shows different stitch forms. Normal stitch form should be as
shown 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.
1) In case needle thread tension is too strong or bobbin thread tension is too weak, as shown in Fig.15 ( b ), turn
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 ( See 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
Fig.15

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16. TIME NEEDLE TO ROTAING HOOK ( Fig.17,18,19,20 )
A. Adjusting the needle position ( See Fig.17 )
1) 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.
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 1.0-1.5mm 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 approx. 0.05mm ( See Fig.20 )
Fig.17 Fig.18
Fig.19 图 20

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17. REPLACE ROTATING HOOK ( Fig.21 )
1) Lift needle bar to the highest position of its stroke.
2) Remove throat plate, take down needle and bobbin case.
3) Loosen Screw ( C ) of hook positioner and take down Hook Positioner ( A).
4) Loosen two Screws ( D ) of rotating hook.
5) Turn balance wheel to raise feed bar to its highest position, then take down the rotating hook by turning it
away 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.
18. ADJUST THE HEIGHT OF FEED DOG ( Fig.22,23 )
1) Turn 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 ).
Fig.21
Fig.22 Fig.23

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19. ADJUST THE POSITION OF FEED DOG ( Fig.24,25 )
The standard position of feed dog is that the clearance between the front end of the throat plate slot and the
first tooth of the fully advanced feed dog is l mm, as shown in Fig.24 .
1) Fully advance the feed dog toward 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 shown by the arrow in Fig. 25 ( a ) to adjust the feed dog position.
4) After the adjustment, be sure to tighten Screw ( A ).
20. TIME FEED MOTION 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 .
If feed motion is not timed to needle motion, adjust as follows ( See Figs.27 and 28 ).
1) RemoveArm 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
Arm Shaft Oil Hole ( C ) aligns with the lower edge of Reference Hole ( G ) of feed and feed lifting
eccentric.
Fig.26 Fig.27
Fig.24 Fig.25

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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 ).
21. ADJUST OPENINGTIME OFTHE TENSION DISCS ( Fig.29 )
within the presser foot lift range of 2-7mm opening time of the tension discs can be adjusted as follows:
1) Remove the rubber plug from the back of arm and loosen Screw (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 ).
Fig.28
Fig.29

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22. LUBRICATION ADJUSTMENT ( Fig.30 )
A. Adjusting oil pump.
In ordinary operation, adjustment is not required for the oil pump. If oil splashing does not occur in the oil
check window when 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 OilAdjusting Screw (A ) as follows:
1) Turn Oil Adjusting Screw ( A ) clockwise to 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.
Fig.30

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23. REGULAR CLEANING ( Fig.31,32,33)
1) Cleaning feed dog ( See Fig.31 )
Remove the throat plate and clear off the dust and lint between feed dog tooth slots.
2) Cleaning rotating hook ( See 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 off the dust and dirt on oil pump screen.
Fig.31 Fig.32
Fig.33

A. ARM BED AND ITS ACCESSORIES
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Fig.
No. Part No. Description
GC0318-1A GC0318-1H
GC0318-1B
GC0318-1AC
Remarks
A01 HM307B8001 Arm 1 1 1
A01 HN208B8001 Arm 1
A02 HM309B8001 Trade mark plate 1
A02 HN207B8001 Trade mark plate 1
A02 HN105B8001 Trade mark plate 1
A02 HN505B8001 Trade mark plate 1
A03 H924025050 rivet 6666GB/T827 φ2.5×5
A04 H005008060 Spring washer 3333GB/T 93 6
A05 H2005B0065 Face plate 1111
A06 HA306B0674 Rubber plug (φ11.8 ) 3333
A07 HA607B0671 Thread guide on face plate 1111
A08 HA106B0676 Thread guide screw 1111SM9/64(40)×6
A09 HA700B2030 Face plate screw 2222SM11/64(40)×20
A10 HA300B2170 Screw group 4444
A11 H6028B8001 Arm side cover 1111
A12 H6029B8001 Gasket for arm side cover 1111
A13 H1210B0671 Check window 1111
A14 H6030B8001 Rubber plug (φ22) 1111
A15 HA112B0691 Screw type tension stud 1111SM11/64(40)×16
A16 HA112B0692 Spring for pre-tension 1111
A17 HA112B0693 Disc for pre-tension 2222
A18 HA112B0694 Spacer for pre-tension 1111
A19 H007013030 Stop ring 1111GB/T 896 3
A20 HA112B0695 Pre-tension thread guide 1111
A21 HA100B2100 Three-hple thread guide 1111
A22 HA100B2110 Set screw 1111SM11/64(40)×5.5
A23 HA115B0701 Thread tension stud 1111SM1/4(40)×17
A24 HA310B0701 Oil thumb nut 1111
A25 HA505B0671 Thread tension spring 1111
A26 HA310B0702 Thread tension releasing disc 1111
A27 HA310B0705 Thread tension disc 2222
A28 HA505B0672 Thread take-up spring 1111
A29 HA310B0703 Thread tension regulating bushing 1111
A30 HA115B0708 Set screw 1111SM9/64(40)×4
A31 HA115B0709 Thread tension releasing pin 1111
A32 HA115B7010 Stop disc 1111
A33 HA115B7011 Rubber ring 1111
A34 HA300B2080 Set screw 1111SM15/64(28)×6.8
A35 HA600B2050 Thread guide at arm center 1111
A36 HA300B2090 Rubber plug (φ8.8 ) 2222
A37 HA300B2100 Rubber plug (φ27) 1111
A38 HA300B2110 Red rubber plug (φ5.7 ) 2222
A39 H2100B2120 Needle plate 1 1
A.ARM BED MECHANISM
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Fig.
No. Part No. Description
GC0318-1A GC0318-1H
GC0318-1B
GC0318-1AC
Remarks
A39 H2900B2030 Needle plate 1
A39 H6520B8001 Needle plate 1
A40 HA300B2190 Needle plate screw 2222SM11/64(40)×4.5
A41 HA124B0711 Slide plate 1111
A42 HA124B0712 Slide plate spring 1111
A43 HA124B0713 Screw 2222SM3/32(56)×2.2
A44 HA100B2220 Leg 3333
A45 HA300B2140 Plate for guide 1111
A46 HA300B2130 Screw 2222SM11/64(40)×5
A47 HA307B0673 Rubber plug 1111
A48 HA300B2160 Screw 5555
A49 H6409B8001 Arm bed cover 1111
A50 H6410B8001 Gasket for arm bed cover 1111
A.ARM BED MECHANISM
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