HIGHLEAD GC24698-BRHL User manual

GC24698-BRHL/BLHL
Long Arm Super Post Bed Compound Feed
Lockstitch Sewing Machine
Instruction Manual
Parts Catalog
SHANGHAI BIAOZHUN HAILING SEWING MACHINERY CO.,LTD.

───CONTENTS───
OPERATION INSTRUCTION
1. PRECAUTIONS BEFORE STARTING OPERATION ·············································································1
2. SPECIFICATIONS ········································································································································1
3. LUBRICATION··············································································································································1
4. PRECAUTIONS OPERATION ····················································································································2
5. INSTALLING NEEDLE································································································································2
6. WINDING BOBBIN THREAD·····················································································································2
7. THREADING ·················································································································································3
8. ADJUSTMENT OF STITCH LENGTH AND REVERSE SEWING ·······················································3
9. SETTING BOBBIN········································································································································3
10. ADJUSTMENT OF THREAD TENSION ···································································································4
11. ADJUSTMENT OF THE PRESSURE OF PRESSER FEET ····································································4
12. TIMING BETWEEN THE HOOK AND NEEDLE····················································································4
13. ADJUSTMENT OF THE HEIGHT OF THE FEED DOG ········································································4
14. ADJUSTMENT OF THE VIRTICAL STROKE WALK FOOT AND VIBRATING FOOT ··················5
15. TIMING BETWEEN THE NEEDLE AND HOOK····················································································5
16. SAFETY CLUTCH DEVICE························································································································6
PARTS CATALOG
A. ARM BED MECHANISM ··························································································································7
B. THREAD TENSION REGULATOR MECHANISM ·············································································9
C. ARM SHAFT&MIDDLE SHAFT MECHANISM ················································································ 11
D. PRESSER FOOT MECHANISM·············································································································14
E. NEEDLE BAR THREAD TAKE-UP MECHANISM ···········································································17
F. STITCH REGULATOR MECHANISM ·································································································20
G. LOWER SHAFT&FEEDING SHAFT MECHANISM ········································································22
H. HOOK SADDLE MECHANISM ·············································································································25
I. OIL LUBRICATION MECHANISM ······································································································27
J. ACCESSORIES ··········································································································································29
K. TOUCH BACK AND FOOT LIFT MECHANIS ··················································································31

—1 —
1. PRECAUTIONS BEFORE STARTING 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 highe℃r）or low temperatures（5℃
or lower）.
（2）Avoid using the machine in dusty conditions.
2. SPECIFICATIONS
Model GC24698-BRHL/BLHL
Max.sewing speed 800r.p.m
Stitch length 10mm
Presser-foot stroke 8mm By hand 16mm By pneumatic
Needle size DP×17 17# -23#
Lubrication system Manual lubrication
Highness of post-bed 670mm
Motor 550W Sevor motor
3. LUBRICATION(Fig.1,Fig.2,Fig.3,Fig.4)
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 portionsindicated by arrow in the below figure.
Filling the oil to the fount timely.

—2 —
Note:Filling the oil to the hook saddle everyday during operation.
See dripping of oil through the oil window to check oiling condition during operation.
4. PRECAUTIONS OPERATION
（1）When the power is turned on or off, keep foot away from the pedal.
（2）It should be noted that the brake may not work when the power is interrupted or power
failure occurs during sewing machine operation.
（3）Since dust in the control box might cause malfunction or control troubles, be sure to keep the
control box cover close during operation.
5. INSTALLING NEEDLE
Note: Before installing the needle, be sure to turn off the power.
To install the needle, turn the machine pulley over toward operator(or
counter-clockwise) until the needle bar moves up to its highest point,
put the needle up into the needle bar as deeply as it will go, with the
long groove of the needle faced left side.Tighten the needle set screw
securely.
6. WINDING BOBBIN THREAD(Fig.5)
Note:When bobbin thread is wound, keep the presser foot lifted
Thread tension ：Particularly in the case of nylon or polyester
thread,wind the bobbin loosely.
（1）Press the bobbin onto the thread winding shaft.
（2）Pass the thread for winding thread as shown in the figure,
and wind the end of the thread clockwise around the bobbin several
times, then wind the thread on the thread adjuster side counter-clock
wise several times.

—3 —
（3）Press lever 1 in the direction of the arrow, and start the sewing machine.
（4）The operation will automatically stop when winding is completed.
（5）Adjustment of thread winding strength, adjust with the thread adjuster nut 2.
（6）Adjustment of thread winding amount, adjust by loosening screw 3 and moving adjustment plate 4:
The thread winding amount will increase when moved in the direction of a.
The thread winding amount will decrease when moved in the direction of b.
7. THREADING(Fig.6,Fig.7)
（1）Pass each needle thread through thread guide A.
Note:When thin slippery thread(polyster thread) is used pass the thread through thread guide B as
show in Fig.6.
（2）Thread take-up lever to the highest position,pass each thread in the order in Fig.7.
Note:Pressing the tension releasing button ,the thread can be pulled out easily.
8. ADJUSTMENT OF STITCH LENGTH AND REVERSE SEWING(Fig.8)
Rotate the stitch length dial to change the stitch length.
When press the feed reversing lever or press the touch-back, reverse sewing will take place.Loose the lever or
touch-back, reverse sewing will disappear.
9. SETTING BOBBIN(Fig.9,Fig10)
Pull out the thread from the bobbin,then hold the bobbin into the bobbin shaft and push down the hinge latch.

—4 —
Hold the needle thread by hand,turn the pulley a circle by right hand.By pulling up the needle thread,the bobbin
thread will be lifted.Combination of bobbin thread and needle thread should be aligned and led back ward.
10. ADJUSTMENT OF THREAD TENSION(Fig.11,Fig.12,Fig.13)
There is virtually no need to adjust the bobbin
thread tension, except for special kind of the
thread, when slight adjustment will be
necessary.
Turning the screw 1 clockwise will increase
the tension of lower thread, otherwise, the tension of lower thread will
decrease (Fig.12).
Needle thread tension should be adjusted in reference to bobbin
thread tension.The needle thread tension can be adjusted by thread
tension adjusting nut.
11. ADJUSTMENT OF THE PRESSURE OF
PRESSER FEET(Fig.14)
The pressure of the presser feet is regulated by the adjusting screw.
To increase the pressure, turn the screw to clockwise, and decrease it, turn the screw to counter-clockwise.
12. TIMING BETWEEN THE HOOK AND NEEDLE(Fig.15)
（1）Set the stitch length to “6”on the feed setting dial.
（2）When the needle is lifted 2.4mm from the lower dead
point,the following positional relationship should be maintained:
a.The lower edge of needle eye should be 2.3mm below the
hook point.
b.The center of the needle the hook point is on a line.
c.Gap between the hook point and the side face of needle
should be 0.05mm.
13. ADJUSTMENT OF THE HEIGHT OF
THE FEED DOG(Fig.16)
The height of the feed dog should be adjusted for different
materials:
（1）If the feed dog is too high,or the pressure of presser foot
is too large,the materials will be damaged.

—5 —
（2）If the feed dog is too low,or the pressure of presser foot is too small, the stitch length cann’t be
assured.
（3）Feed dog height should be measured at the point where the needle is at the top position.
Thin material:The height of the feed dog is 0.8mm.
Usual material: The height of the feed dog is 1mm.
Heavy material: The height of the feed dog is 1.2mm.
Adjustment procedure:
（1）Lean the machine head backward.
（2）Turn the pulley by hand and stop when the feed dog rises to the maximum height.
（3）Loose the feed bar forked connection set screw and adjust the height of the feed dog.
（4）After adjusted, tighted the set screw.
Note:The feed dog height is factory-adjusted to 1.2mm.
14. ADJUSTMENT OF THE VIRTICAL
STROKE WALK FOOT AND VIBRATING
FOOT(Fig.17)
When the material with large elasticity is sewn,or when thickness of
material changes,the vertical stroke of the presser feet should be
adjusted as follow:
（1）Loosen the special screw.
（2）The vertical strokes of presser feet become minimum when
the crank rod is moved downward and set.
（3）The vertical storkes of presser feet become minimum when
the crank rod is moved upward and set.
（4）After the adjustment,tighten the special nut.
Note:The vertical strokes of presser feet can be adjusted within a
range from 2mm to 6mm.
15. TIMING BETWEEN THE NEEDLE AND
HOOK(Fig.18,Fig.19,Fig.20)
（1）Set the stitch length to “0”on the feed setting dial.

—6 —
（2）Lean the machine head backward.
（3）Loosen the feed lifting rock shaft crank set screw A and B.
（4）Set the needle at the lowest position.
（5）Adjust the distance between presser bar and vibration bar to 8mm and temporarily tighten the feed
lifting rock shaft crank set screw A and B.
（6）Check the right feed lifting rock shaft crank is connected with the link at right angle,as shown in
Fig.19.
（7）If the connection is not at righr angle,remove the back cover,loosen screw C .
（8）And regulate the right angle.
（9）After the complention of adjustment,fully tighten the screwA,B and C.
Note:At the same time the make sure that the position between the needle and the feed dog.
16. SAFETY CLUTCH DEVICE(Fig.21,Fig.22)
Safety clutch device is installed to prevent the hook and belt from damage in case the thread is caught into the
hook when the machine is loaded abnormally during operation.
（1）Function of safety clutch
a.When the safety clutch operate,the belt pulley will be unloaded,the lower shaft will stop.Only the arm
shaft operate.The machine stop operation.
b.Clean the thread thoroughly which is caught into the hook.
c.Turn the belt bushing by hand,check the lower shaft rorates lightly.Then set the clutch device in the
starting position.
（2）Set the safety clutch
a.While pressing down the push botton on the bed by left hand,turn the pulley slowly by right hand away
from you as shown in Fig.21.
b.When the belt pulley stopped by the gear plate,then turn the pulley more firmly.
c.Release the push botton,the safety cluth device is set.
（3）Force applied to the safety clutch
a.The force applied to the safety clutch is the smallest when the mark on the eccentric pin faces the center
of the lower shaft.The force proprotinally increases as the mark faces the outside.
b.To adjust the force slide the belt,loosen the set screw,and turn eccentric pin.
c.After the adjustment,make sure to fasten the set screw.

A.ARM BED MECHANISM
— 7 —— 7 —

Fig.
No. Part No. Description
GC24698-BRHL
GC24698-BLHL
Remarks
A01 HA300B2090 Rubber cap 22
A02 HA300B2170 Screw 19 19 SM11/64(40)×8
A03 H4716B8001 Oil guard plate 11
A04 H4717B8001 Thread take-up cover 11
A05 H4715B8001 Rubber cap 1 1 Ф13
A06 H4718B8001 Arm side cover (left) 11
A07 H2000B2010 Rubber cap 1 1 Ф13
A08 HA700B2060 Screw 2 2 SM11/64(40)×8
A09 H2400B2100 Thread guide 11
A10 H7007D7101 Bobbin winder 11
A11 HN41B38001 Arm side cover 11
A12 H7014D7101 Thread tension complete 11
A13 H0113B8001 Rubber cap 1 1 Ф36.5
A16 HA307B0673 Rubber cap 1 1 Ф18
A17 H7010E8001 Pin 11
A18 H3212B0661 Thread guide 11
A19 HA124B0713 Screw 2 2 SM3/32(56)×2.2
A20 H2407B2023 Felt 11
A21 H2407B2022 Plate 11
A22 H3200B2100 Screw 1 1 SM9/64(40)×6.5
A23 H3000D2160 Screw 1 1 SM9/64(40)×7
A24 H4726B8001 Thread guide 11
A25 H4727B8001 Face plate 11
A26 H2400B2080 Screw 2 2 SM3/16(28)×10
A27 H2400B2070 Thread guide 11
A28 H4730B8001 Guide mounting plate 11
A29 H2400B2060 Plate for oil guard 11
A30 H3200B2060 Oil guard 11
A31 HA300B2090 Rubber cap 11
A32 H3207B0066 Arm side plate(right) 11
A33 HN41B58001 Rubber cap 11
A35 H2000M0090 Oil cup 33
A36 HE956B8001 Bed bolt 11
A.ARM BED MECHANISM
— 8 —

B.THREAD TENSION REGULATOR MECHANISM
— 9 —— 9 —

Fig.
No. Part No. Description
GC24698-BRHL
GC24698-BLHL
Remarks
B01 H3221B6811 Screw 2 2 SM9/64(40)×1.9
B02 H3221B3142 Tension releasing plate 11
B03 H3221B6812 Tension releasing spring 11
B04 H4705C8001 Screw 1 1 SM9/64(40)×2.9
B05 H4706C8001 Lever 11
B06 HA7311C306 Screw 1 1 SM9/64(40)×5.5
B07 H4707C8001 Mounting plate 11
B08 H007013050 E-type ring 11
B09 H3221B6820 Mounting plate 11
B10 HA300C2030 Screw 2 2 SM11/64(40)×8
B11 H3221B6810 Nut 1 1 SM11/64(40)
B12 H4708C8001 Spring 11
B13 H4709C8001 Push button 11
B14 H3221B0683 Thread tension stud 1 1 SM11/64(40)×10
B15 HA112B0693 Thread tension disc 22
B16 H3221B0684 Spring 11
B17 HA710B0671 Thumb nut 1 1 SM11/64(40)
B18 H3221B0682 Pin 22
B19 H3306B0661 Thread guide 11
B20 HA106B0676 Screw 1 1 SM9/64(40)×6
B21 HA310B0702 Tension releasing disc 11
B22 H4710C8001 Spring 11
B23 HA310B0701 Thumb nut 11
B24 HA115B7010 Thumb nut revolution stopper 11
B25 HA310B0705 Thread tension disc 22
B26 H3221B0686 Thread tension stud 1 1 SM1/4(40)×13.5
B27 H32481B721 Thumb nut 1 1 SM1/4(40)
B28 H4713C8001 Thread take-up spring 11
B29 H32481BD21 Thread guide plate 11
B30 H4804C8001 Screw 1 1 SM9/64(40)×2.9
B31 H4805C8001 Screw 1 1 SM1/4(40)×8.5
B32 H3221B6817 Pin 11
B33 H3230K0751 Screw 1 1 SM11/64(40)×10
B34 H3200B2100 Screw 1 1 SM9/64（40）×6.5
B35 H3221B6819 Stopper 11
B.THREAD TENSION REGULATOR MECHANISM
— 10 —

C.ARM SHAFT&MIDDLE SHAFT MECHANISM
— 11 —— 11 —

Fig.
No. Part No. Description
GC24698-BRHL
GC24698-BLHL
Remarks
C01 HA307C0662 Set screw 1 1 SM1/4(40)×6
C02 HA105D0662 Screw 1 1 SM1/4(40)×4
C03 H4706D8001 Crank 11
C04 HA100C2060 Screw 1 1 SM9/32(28)×13
C05 HA100C2070 Screw 1 1 SM9/32(28)×10
C06 H32111B204 Arm shaft bushing(left) 11
C07 H2405D0664 Screw 1 1 SM15/64(28)×14
C08 H32111B104 Felt 11
C09 H7005D8001 Bushing 11
C10 H5320C8001 Screw 2 2 SM15/64(28)×8
C11 HN40D48001 Arm shaft 11
C12 H3205C0661 Spring flange 44
C13 HA110D0672 Screw 1 1 SM15/64(28)×12
C14 H3205C1021 Belt pulley(upper) 11
C15 HA100F2130 Screw 1 1 SM15/64(28)×14.5
C16 H3205J0662 Bearing 2 2 6204ZZNR/5K
C17 HA113F0684 Screw 6 6 SM15/64(28)×8.5
C18 H3205J0661 Bushing 22
C19 H7104D8001 Belt(upper) 11
C20 HE016C8001 Bearing 22
C21 HN40D68001 Tension roll 11
C22 H7107D8001 Mounting block 11
C23 H005005060 Washer 44
C24 H3208G0676 Screw 4 4 SM15/64(28)×14
C25 H007009150 Retaining ring C-type 11
C26 H3208H0661 Bearing 1 1 6004ZZNR
C27 H5336C8001 Middle shaft busing 11
C28 HN40D88001 Middle shaft 11
C29 HN41D08001 Belt pulley(middle) 11
C30 HA104F0654 Screw 2 2 SM15/64(28)×10
C31 HN41D38001 Pulley 11
C32 H7206C8001 Screw 2 2 SM5/16(24)×19
C33 H4100C0020 Pulley 11
C34 HA110D0672 Screw 2 2 SM15/64(28)×12
C43 HA104F0654 Screw 1 1 SM15/64(28)×10
C44 H4715D8001 Pin 11
C45 H4713D8001 Link 11
C46 H4714D8001 Pin 11
C47 H4716D8001 Spring 11
C48 H007013025 E-type ring 11
C49 H4717D8001 Link 11
C.ARM SHAFT&MIDDLE SHAFT MECHANISM
— 12 —

Fig.
No. Part No. Description
GC24698-BRHL
GC24698-BLHL
Remarks
C50 H4718D8001 Pin 11
C51 H4719D8001 Link 11
C52 H4720D8001 Bushing 11
C53 H4721D8001 Screw 1 1 SM15/64(28)×10.5
C54 H3200C2030 Belt(lower) 11
C55 H4722D8001 Belt pulley(lower) 11
C56 H4723D8001 Screw 2 2 SM15/64(28)×4.5
C.ARM SHAFT&MIDDLE SHAFT MECHANISM
— 13 —

D.PRESSER FOOT MECHANISM
— 14 —— 14 —

Fig.
No. Part No. Description
GC24698-BRHL
GC24698-BLHL
Remarks
D01 H4705E8001 Feed lifting rock shaft 11
D02 H4706E8001 Set screw 2 2 SM1/4(24)×7
D03 H4707E8001 Bushing 22
D04 H0030580608 Nut 1 1 M6×0.75
D05 H4709E8001 Crank 11
D06 H3115F0671 Screw 1 1 SM1/4(28)×16
D07 H2013J0065 Washer 11
D08 H2014J0066 Connecting rod 11
D09 H2000J2100 Screw 1 1 M6×0.75
D10 H4713E8001 Oil wick 11
D11 H20111C106 Holder 11
D12 H007009250 C-type ring 11
D13 H4714E8001 Eccentric 11
D14 HA307C0662 Screw 2 2 SM1/4(40)×6
D15 H4730E8001 Lever spring 11
D16 H3100G2170 Screw 1 1 SM1/4(24)×10.5
D17 H4728E8001 Knee lifting lever 11
D18 H4729E8001 Screw 1 1 SM15/64(28)×41
D19 H4727E8001 Twist spring 11
D20 H3100G2130 Screw 1 1 SM1/4(24)×7
D21 H4726E8001 Nut 1 1 SM1/4(24)
D22 H4725E8001 Screw 1 1 SM1/4(24)×19
D23 HA111G0683 Screw 2 2 SM11/64(40)×12
D24 H4723E8001 Guide 11
D25 H4768E8001 Thread releasing plate 11
D26 H4746E8001 Spring bracket 11
D27 H4744E8001 Bushing 22
D28 H4754E8001 Presser bar 11
D29 HN40E57101 Lifting presser foot 11
D30 HE204I8001 Finger guard 11
D31 HE044J8001 Washer 11
D32 H3200E2020 Screw 1 1 SM1/8(44)×4
D33 H2404I0034 Screw 1 1 SM9/64(40)×8.5
D34 H4748E8001 Lift lever 11
D35 H4767E8001 Spring 11
D36 H4749E8001 Screw 1 1 SM11/64(40)×8.5
D37 H2004J0655 Screw 11
D38 H4717E8001 Roller 11
D39 H4718E8001 Screw 1 1 SM11/64(32)×6
D40 H2004J0662 Screw 1 1 SM1/4(40)×5
D41 H4753E8001 Screw 1 1 SM11/64(40)×17.5
D.PRESSER FOOT MECHANISM
— 15 —

Fig.
No. Part No. Description
GC24698-BRHL
GC24698-BLHL
Remarks
D42 H4752E8001 Bracket 11
D43 H4715E8001 Bell crank 11
D44 H4708D8001 Screw 2 2 SM1/4(24)×13
D45 H4719E8001 Link 11
D46 H4721E8001 Bell crank guide 11
D47 H4722E8001 Washer 22
D48 HA100E2150 Screw 2 2 SM11/64(40)×10
D.PRESSER FOOT MECHANISM
— 16 —

E.NEEDLE BAR THREAD TAKE-UP MECHANISM
— 17 —— 17 —

Fig.
No. Part No. Description
GC24698-BRHL
GC24698-BLHL
Remarks
E01 H2405D1122 Oil wick 11
E02 H4706F8001 Needle bar guide bracket stud 11
E03 H4707F8001 Screw 1 1 SM5/16(28)×10.4
E04 HA100C2020 Screw 1 1 SM15/64(28)×10
E05 H2405D1122 Oil wick 11
E06 H2405D1121 Thread take-up lever support stud 11
E07 H4712F8001 Thread take-up lever 11
E08 HA110D0672 Screw 1 1 SM15/64(28)×12
E09 H2405D1112 Thread take-up slide brock 11
E10 H24211D405 Oil wick 11
E11 H24211D305 Plug 11
E12 H2405D0662 Needle bar crank pin 11
E13 H4716F8001 Oil wick 11
E14 H4719F8001 Needle bar guide bracket 11
E15 H32111D304 Screw 6 6 SM3/32(56)×4
E16 H4721F8001 Washer 2 2 1.4
E17 H3204D6513 Felt 11
E18 H4722F8001 Needle bar holder 11
E19 H32111D604 Screw 1 1 SM9/64(40)×8.5
E20 H4806F8001 Needle bar 11
E21 H3129F0691 Screw 1 1 SM3/32(56)×3
E22 HA100C2170 Screw 1 1 SM1/8(44)×4.5
E23 H3129F0693 Thread guide 11
E24 Needle 1 1 DP×17-23
E25 H4807F8002 Vibrating presser foot 11
E26 HA700F2100 Screw 1 1 SM11/64(40)×7
E27 H4725F8001 Vibrating presser bar 11
E28 H3400C2020 Screw 1 1 SM11/64(40)×12
E29 H3400C2030 Washer 11
E30 H3400C2010 Needle bar guide 11
E31 H4726F8001 Vibrating presser bar link 11
E32 H4753E8001 Screw 2 2 SM11/64(40)×17.5
E33 H4728F8001 vibrating presser bar guide 11
E34 H4729F8001 Spring 11
E35 H4730F8001 Vibrating presser spring guide 11
E36 H4717F8001 Connecting link 11
E37 H3406C0672 Needle bar vibrating crank(left) 11
E38 H4734F8001 Washer 11
E39 H3204B0652 Needle bar vibrating shaft bushing 22
E40 H7004F8001 Needle bar vibrating shaft 11
E41 H4759F8001 Slide block 11
E.NEEDLE BAR THREAD TAKE-UP MECHANISM
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