HIGHLEAD GA2688-1 User manual

SHANGHAI BIAOZHUN HAILING SEWING MACHINERY CO.,LTD.
GA2688-1
Cylindrical Bed Extra-Heavy Duty
Compound-Feed Lockstitch Sewing Machine
Instruction Manual
Parts Catalog

≡CONTENT≡
1. PRECAUTIONS BEFORES STARTING OPERATION ……………………………………………………………1
■Safety precautions………………………………………………………………………………………1
■Precautions before starting operation…………………………………………………………… 1
■Precautions for operating conditions …………………………………………………………… 1
2. SPECIFICATION ……………………………………………………………………………………………1
3. PREPARATION FOR OPERATION ……………………………………………………………………………2
■Cleaning the machine …………………………………………………………………………………2
■Examination………………………………………………………………………………………………2
■Lubrication………………………………………………………………………………………………2
■Testing……………………………………………………………………………………………………2
4. HOW TO ATTACH A NEEDL………………………………………………………………………………… 2
5. WINDING OF BOBBIN THREAD………………………………………………………………………………3
6. ADJUSTMENT OF THE BOBBIN WINDER ……………………………………………………………………3
■In case of uneven winding……………………………………………………………………………3
■Winding amount of thread…………………………………………………………………………… 3
■Winding strength……………………………………………………………………………………… 3
7. THREADING …………………………………………………………………………………………………4
8. REMOVING AND INSERTING THE BOBBIN …………………………………………………………………4
■Removing …………………………………………………………………………………………………4
■Installation ……………………………………………………………………………………………4
9. ADJUSTING THE THREAD TENSION…………………………………………………………………………4
■Tension of the Upper thread…………………………………………………………………………5
■Tension of the lower thread…………………………………………………………………………5
10. ADJUSTMENT OF PRESSER PRESSURE ……………………………………………………………………5
11. ADJUSTMENT OF WALKING FOOT AND PRESSER FOOT …………………………………………………6
12. ADJUSTMNET OF STITCH LENGTH
AND FORWARD/BACKWARD SEWING ………………………………………………………………………6
13. FEED DOG HEIGHT ………………………………………………………………………………………6
14. ADJUSTING THE HEIGHT OF THE NEEDLE BAR …………………………………………………………7

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1. PRECAUTIONS BEFORES STARING OPERATION
1) Safety precautions：
(1) When turning the power on, keep your hands and fingers away from the area around/under the needle
and the area around the pulley.
(2) Power must be turned off when the machine is not in use, or when the operator leaves the seat.
(3) Power must be turned off when tilting the machine head, installing or removing the “V” belt, adjusting
the machine, or when replacing.
(4) Avoid placing fingers, hairs, bars etc., near the pulley, “V” belt, bobbin winder pulley, or motor when
the machine is in operation.
(5) Do not insert fingers into the thread take-up cover, under/around the needle, or pulley when the machine
is in operation.
(6) If a belt cover, finger guard, eye guard are installed, do not operate the machine without these safety
devices.
2) Precautions before starting operation：
(1) If the machine’s oil pan has an oil sump, never operate the machine before filling it.
(2) If the machine is lubricated by a drop oiler, never operate the machine before lubricating.
(3) When a new sewing machine is first turned on, verify the rotational direction of the pulley with the
power on. (The pulley should rotate counterclockwise when viewed from the pulley)
(4) Verify the voltage and (single or three) phase with those given on the machine nameplate.
3) Precautions for operating conditions：
1) Avoid using the machine at abnormally high temperatures（35℃or higher）or low temperatures（5℃or
lower）.
2) Avoid using the machine in dusty conditions.
2、SPECIFICATION
Max. sewing speed (r.p.m) 800 r.p.m
Needle No. DY×3 26#
Needle bar stroke (mm) 56
Thread take-up lever stroke (mm) 96
Stitch length (mm) 0-11
Presser-foot stroke By hand (mm) 13
By knee (mm) 20
Shuttie hook KSP-204N
Lubrication Manual

—2 —
3、PREPARATION FOR OPERATION
（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 pulley 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）Lubrication (Fig.1)
When a new sewing machine is used for the first time, or sewing machine left out of use for considerably
long time is used again, replenish a suitable amount of oil to the portions indicated by arrow in below figure.
CAUTION：Please use white spindle oil.
Always keep the presser lifted before attempting a dry run.
（4）Testing
In order to get the best working situation, run the sewing machine in a low speed for about 1 month after
lubricated fully. Then increase the speed to the need one.
4、HOW TO ATTACH A NEEDLE (Fig.2)
CAUTION：Before using the following procedures, be sure to turn the power switch off.
The needle used by this sewing machine is DY×3 26#。During operation, proper needle can be chosen
according to the sewing thread.（the sewing thread should be able to pass the pinhole.）
Fig.1

—3 —
5、WINDING OF BOBBIN THREAD (Fig.3)
(1) Push the bobbin ③on the bobbin winder
shaft as far as it will go.
(2) Bring the thread forward toward the bobbin
and wind from below in clockwise direction
several times around the bobbin.
(3) Push the lever ⑤toward other side so that
the driving wheel and driven wheel will engage
and then start the machine.
(4) The driven wheel will automatically be free
from the driving wheel and stop after the bobbin
is filled with thread.
6、ADJUSTMENT OF THE BOBBIN WINDER (Fig.3)
(1) In case of uneven winding
If the thread dose not wind evenly on the bobbin, loosen the nut ①and move the bracket ②to the
right or to the left as may be required, then tighten the nut.
(2) Winding amount of thread
Adjusting ⑥can increase or decrease the amount of thread wound on the bobbin.
(3) Winding strength
Strength of the winding can be adjusted with the nut ①.
Fig.2
3
Fig.3
3

—4 —
7、THREADING (Fig.4)
Raise the needle bar to its highest position and route the upper thread in the order illustrated below.
8、REMOVINGAND INSERTING THE BOBBIN
(1) Removing:
Open the shuttle race cap and the bobbin holder, then take out the bobbin.
(2) Installation:
Put the bobbin in the rotary hook case, Permit about 5 cm of bobbin thread to hand down freely. Install
the bobbin in the bobbin case so that the thread wound direction is clockwise. Then close the rotary hook
and the shuttle race cap.
9、ADJUSTING THE THREAD TENSION (Fig.5)
For ordinary stitching, the tension of the upper and the lower threads should be equal.
Fig.4
5

—5 —
(1) Tension of the Upper thread
Before adjusting the tension of the upper thread, be sure that presser foot is let down. To adjust tension,
turn serrated nut on tension device to the right (clockwise) to increase tension and to the left (counter-clockwise)
if you desire to decrease the tension.
(2) Tension of the lower thread
The lower thread tension is controlled by the larger screw near the end of the spring at the outside of the
bobbin case. Turning this screw to the right (clockwise) will increase the thread tension, while turning it to the
left (counter-clockwise) will decrease the tension.
10、ADJUSTMENT OF PRESSER PRESSURE (Fig.6)
(1) Pressure should be adjusted according to the
material to be sewn.
(2) Pressure on both the walking foot and the
presser foot can be adjusted. (The adjusting
screw has been set before shipment.)
(3) Sewing pressure should be adjusted to the
minimum required strength.
Fig.6
Fig.5

—6 —
11、ADJUSTMENT OFWALKING FOOTAND PRESSER FOOT (Fig.7)
(1) The alternating movement on the walking foot
and presser foot can be adjusted by changing
the position relations of the parts of the presser
foot lifting mechanism.
(2) Changing the position relation of the connecting
link 2 and the crank 3 can complete the adjustment.
(3) Adjustment should be changed according to the
thickness of the material to be sewn..
12、ADJUSTMENT OF STITCH LENGTH AND FORWARD/BACKWARD
SEWING (Fig.8)
(1) Adjusting the stitch length adjusting bolt can
change the stitch length.
(2) Stitch length can be adjusted between 0-11mm.
(3) Setting the stitch length adjusting bolt above
“0”can backstitch.
13、FEED DOG HEIGHT (Fig.9)
The feed dog should be 1.5 mm higher than the vertex
of the needle plate. Adjustment of the feed dog height
can be done as follows:
(1) Turn the machine pulley so as to raise the feed dog
to its highest point.
(2) Loosen the screw of the feed dog and adjust the
height by raising or lowering it. Then tighten the screw.
Fig.7
Fig.8
Fig.9

—7 —
14、ADJUSTING THE HEIGHT OF THE NEEDLE BAR (Fig.10)
When the needle bar is at its highest point, normally
the measurement between the highest point of the
needle plate and the needlepoint is 28 mm. When this
distance need to be adjusted, the steps is as follows:
(1) Take down the face plate, adjust the needle bar to
its highest position.
(2) Loosen the screw of needle bar connecting stud
screw.
(3) Adjust the needle bar to the right position.
(4) Tighten the screw.
Fig.10

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A.ARM BED AND ITS ACCESSORIES

— 9 —
Fig.
No. Part No. Description Pcs. Remarks
A1 H7208B8001 Arm 1
A2 H7210B8001 Bed 1
A3 H7215B8001 Oil pipe 1
A4 H7216B8001 Oil wick 3
A5 HA307B0674 Rubber plug 2
A6 H7217B8001 Needle bar guide bracket stud bushing 1
A7 HA100C2020 Screw 1SM15/64(28)×10
A8 HA100C2020 Screw 1SM15/64(28)×10
A9 H7218B8001 Presser bar bushing 1
A10 HA305E0662 Screw 1SM15/64(28)×4.5
A11 H7219B8001 Pin 1
A12 HA100C2020 Screw 1SM15/64(28)×10
A13 H7220B8001 Mandril of needle bar guide bracket 1
A14 H2405D0664 Screw 1SM15/64(28)×14
A15 H7225B8001 Arm side cover 1
A16 HA100B2060 Screw 1SM11/64(40)×9
A17 H7228B8001 Round cover 2
A18 HA100B2060 Screw 2SM11/64(40)×9
A19 H7235B8001 Worktable for accessories 1
A20 HA7311C806 Screw 2SM11/64(40)×9
A21 H7236B8001 Face plate 1
A22 H7238B8001 Screw 2SM15/64(28)×22
A23 H7240B8001 Thread guide 1
A24 H3410C301K Screw 1SM9/64(40)×6.5
A25 HA115B0702 Nut 1
A26 H7241B8001 Tension spring 1
A27 HA310B0705 Tension disc 2
A28 H7242B8001 Tension screw stud 1
A29 H2010J0066 Tension nut 1SM9/32(28)
A30 H7243B8001 Thread tension regulator complete base 1
A31 HA111G0683 Screw 2SM11/64(40)×12
A32 H7244B8001 Tension releasing disc 1
A33 H7245B8001 Screw 1SM3/16"(28)
A34 H7246B8001 Thread guide 1
A35 HA115B0702 Tension nut 1
A36 H7241B8001 Tension spring 1
A37 H7248B8001 Washer 2
A38 H7249B8001 Felt 2
A39 H7250B8001 Damping plate 1
A40 H7251B8001 Tension screw stud 1
A41 HA710N0683 Temsopm nut 1SM15/64(28)
A42 H7253B8001 Thread take-up spring 1
A43 H7254B8001 Spring 1
A.ARM BED AND ITS ACCESSORIES

— 10 —
Fig.
No. Part No. Description Pcs. Remarks
A44 H7255B8001 Thread take-up spring guide plate 1
A45 H3410C301K Screw 1SM9/64(40)×6.5
A46 H7257B8001 Screw 1SM1/8(44)
A47 H7258B8001 Nut 1SM1/8(44)
A48 H7259B8001 Tension spring 1
A49 H7260B8001 Tension disc 1
A50 H7261B8001 Thread tension regulator complete base 1
A51 HA7311CC06 Screw 1SM9/64(40)×6
A52 H7262B8001 Thread guide 1
A53 H3410C301K Screw 1SM9/64(40)×6.5
A54 HA300B2100 Rubber plug 1
A.ARM BED AND ITS ACCESSORIES

— 11 —
B.NEEDLE BAR AND THREAD TAKE-UP MECHANISM

— 12 —
Fig.
No. Part No. Description Pcs. Remarks
B01 H7204C8001 Pulley 1
B02 H7205C8001 Screw 1SM5/16(24)×22.4
B03 H7206C8001 Screw 1SM5/16(24)×21.4
B04 H7208C8001 Arm shaft 1
B05 HA108G0661 Collar 1
B06 HA105D0662 Screw 2SM1/4(40)×6
B07 H7209C8001 Thread thke-up cam 1
B08 H7210C8001 Needle bar connecting base link screw 1
B09 H403060120 Screw 2GB/T68 M6×12
B10 H4933K8001 Screw 2SM1/4(40)×10
B11 H602040450 Pin 1GB/T117 4×45
B12 H7211C8001 Thread take-up lever 1
B13 H7212C8001 Screw 1
B14 H7213C8001 Roller 1
B15 H7214C8001 Roller pin 1
B16 H2010J0066 Nut 1SM9/32(28)
B17 H007013050 Retaining ring-E type 1GB/T896 5
B18 H7215C8001 Needle bar connecting link screw 1
B19 H2010J0066 Nut 1SM9/32(28)
B20 H7216C8001 Needle bar connecting link 1
B21 H7217C8001 Needle bar connecting stud 1
B22 H7218C8001 Screw 2SM1/4(40)×4.5
B23 H7219C8001 Needle bar 1
B24 HA700F2100 Screw 1SM11/64(40)×7
B25 H7220C8001 Needle 1DY*3 26#
B26 H7222C8001 Needle bar guide bracket 1
B27 H7223C8001 Needle bar guide bracket pin 1
B28 H7224C8001 Oil wick 1
B29 H7225C8001 Needle bar guide bracket plate 1
B30 H3208G0676 Screw 1SM15/64(28)×10.5
B31 HA111G0683 Screw 1SM11/64(40)×12
B32 H7226C8001 Needle bar guide bracket plate base 1
B33 H415060140 Screw 1GB/T70.1 M6×14
B34 H7213B8001 Bushing 1
B35 H2405D0664 Screw 1SM15/64(28)×14
B36 H7214B8001 Felt 3
B37 H7212B8001 Bushing 1
B38 H2405D0664 Screw 1SM15/64(28)×14
B39 H7211B8001 Bushing 1
B40 H2405D0664 Screw 1SM15/64(28)×14
B.NEEDLE BAR AND THREAD TAKE-UP MECHANISM

— 13 —
C.LOWER SHAFT MECHANISM

— 14 —
Fig.
No. Part No. Description Pcs. Remarks
C01 H7204D8001 Eccentric 1
C02 H7205D8001 Screw 1SM15/64(28)×12
C03 H7206D8001 pin 2
C04 H415060250 Screw 2GB/T70.1 M6×25
C05 H4728H8001 Washer 2
C06 H7237D8001 Bearing 1K43×48×17(NTN)
C07 H7207D8001 Eccentric cover 1
C08 H2000B2050 Screw 2SM11/64(40)×9
C09 H7208D8001 Crank connecting rod 1
C10 H7209D8001 Crank connecting rod pin 1
C11 H7210D8001 Pin 1
C12 H7211D8001 Screw 1SM3/16(32)×18
C13 H7213D8001 Shuttle shaft 1
C14 H7214D8001 Plate 1
C15 H7215D8001 Plate 1
C16 H7216D8001 Screw 2
C17 H2000M0120 Nut 2SM11/64(40)
C18 H7218D8001 Inside Shaft 1
C19 H7219D8001 Oil wick 1
C20 H7220D8001 Rivet 1
C21 H7222D8001 Lower shaft crank 1
C22 H415080200 Screw 1GB/T70.1 M8×20
C23 H7223D8001 Shuttle shaft slide block 1
C24 H7224D8001 Screw 1
C25 H2010J0066 Nut 1SM9/32(28)
C26 H7226D8001 Lower shaft 1
C27 HA108G0661 Collar 1
C28 H7239D8001 Screw 2SM1/4(40)×3.5
C29 H7227D8001 Shuttle driver 1
C30 H602040220 Pin 1GB/T117 4×22
C31 H7228D8001 Bobbin 1
C32 H7229D8001 Shuttle race body 1
C33 H7230D8001 Shuttle race back ring 1
C34 H7231D8001 Screw 2SM3/16(28)
C35 H7232D8001 Spring 2
C36 H7233D8001 Shuttle race cap 1
C37 H7234D8001 Screw 2SM1/8(44)
C38 H7235D8001 Spring 2
C39 H7236D8001 Screw 2SM3/32(56)
C40 H7234B8001 Bushing 1
C41 HA3411D308 Screw 1SM15/64(28)×7
C42 HA100C2020 Screw 1SM15/64(28)×10
C43 H7230B8001 Bushing 1
C.LOWER SHAFT MECHANISM

— 15 —
Fig.
No. Part No. Description Pcs. Remarks
C44 H2405D0664 Screw 1SM15/64(28)×14
C45 H7229B8001 Bushing 1
C46 H2405D0664 Screw 1SM15/64(28)×14
C47 H7240D7101 Shuttle hook 1KSP-204N(佐文）
C.LOWER SHAFT MECHANISM

— 16 —
D.FEEDING MECHANISM

— 17 —
Fig.
No. Part No. Description Pcs. Remarks
D01 H7205E8001 Feed cam 1
D02 H7206E8001 Screw 2SM15/64(28)×6
D03 H7207E8001 Feed cam cover 1
D04 H2000B2050 Screw 2SM11/64(40)×9
D05 H7208E8001 Feed forked connection 1
D06 H7209E8001 Feed forked connection crank pin 1
D07 H2010J0066 Nut 1SM9/32(28)
D08 H7210E8001 Stitch length connecting link 1
D09 H7211E8001 Stitch length connecting link crank pin 1
D10 H415050140 Screw 1GB/T70.1 M5×14
D11 H7212E8001 Stitch length adjusting pin 1
D12 H7213E8001 Damping plate 1
D13 HA104G0012 Screw 2SM3/16(28)×12
D14 H7211D8001 Screw 1SM3/16(32)×18
D15 H7214E8001 Stitch length adjusting bolt 1
D16 H7215E8001 Stitch length limited plate 1
D17 H7216E8001 Nut 1
D18 HE00001032 Metal ball 1GB/T308 3.175
D19 H7217E8001 Spring 1
D20 HF01080320 Plastic ball 1JB/T7271.1 M8×32
D21 H003008080 Nut 1GB/T6172.1 M8
D22 H7218E8001 Feed driving rock shaft crank 1
D23 H415060200 Screw 2GB/T70.1 M6×20
D24 H7219E8001 Feed driving rock shaft crank pin 2
D25 H007013080 Retaining ring-E type 2GB/T896 8
D26 H7220E8001 Feed driving rock shaft 1
D27 HA108G0661 Collar 1
D28 H7239D8001 Screw 2SM1/4(40)×3.5
D29 H7221E8001 Crank pin 1
D30 H7222E8001 Feed driving connecting link 1
D31 H7223E8001 Feed driving connecting link crank pin 1
D32 H2013N0067 Nut 1SM1/4(24)
D33 H7225E8001 Feed dog base 1
D34 H7226E8001 Feed dog 1
D35 HA700F2100 Screw 1SM11/64(40)×7
D36 H7219E8001 Feed lifting rock shaft crank pin 1
D37 H007013080 Retaining ring-E type 1GB/T896 8
D38 H7227E8001 Feed lifting rock shaft 1
D39 H7228E8001 Collar 1
D40 H7239D8001 Screw 2SM1/4(40)×3.5
D41 H7229E8001 Feed dog base limited plate 1
D42 H5711G8001 Screw 2SM11/64(40)×6
D43 H7230E8001 Needle plate 1
D.FEEDING MECHANISM

— 18 —
Fig.
No. Part No. Description Pcs. Remarks
D44 H7231E8001 Screw 2SM3/16(28)×9.5
D45 H7232E8001 Stitch length outside plate 1
D46 HA104F0654 Screw 2SM15/64(28)×9
D47 H7232B8001 Bushing 1
D48 HA100C2020 Screw 1SM15/64(28)×10
D49 H7231B8001 Bushing 1
D50 HA3411D308 Screw 1SM15/64(28)×7
D51 H7233B8001 Bushing 1
D52 H2405D0664 Screw 1SM15/64(28)×14
D.FEEDING MECHANISM