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

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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

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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

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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

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(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

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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

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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