Highlead GC24698-25L, GC24698-25R User Manual

GC24698-25L/-25R

Long Arm Post Bed Compound Feed Split

Lockstitch Sewing Machine

Instruction Manual

Parts Catalog

SHANGHAI HUIGONG NO.3 SEWING MACHINE FACTORY

----- CONTENTS -----

Preparation for operation···············································································································1

1. Safety precautions ·································································································································1

2. Precaution before Starting Operation ·································································································1

3. Precaution for Operating Conditions ··································································································1

Cautions on use········································································································································· 1

1. Lubrication ············································································································································1

2. Cautions on operation ··························································································································2

Operation ·····················································································································································2

1. How to attach needle ·····························································································································2

2. How to wind the lower thread ··············································································································2

3. Selection of Thread ····························································································································· 2

4. How to route the upper thread ············································································································3

5. Adjustment of stitch length and reverse sewing ·················································································3

6. Balance of thread tension ·····················································································································3

7. Upper thread tension ····························································································································4

8. Adjustment of pressure of presser f oot ·······························································································4

9. Timing between rotating hook motion and needle motion ································································4

10. Adjustment of Feed dog height ············································································································4

11. Walking foot and presser foot vertical stroke adjustment ································································5

12. Safety clutch device ·······························································································································5

Specifications ················································································································································6
PARTS LIST ·················································································································································7

A. ARM BED MECHANISM ···················································································································7
B. THREAD TENSION REGULATOR MECHANISM ·······································································9
C. ARM SHAFT MECHANISM ············································································································11
D. PRESSER FOOT MECHANISM ·····································································································13
E. THRED TAKE-UP LEVER & NEEDLE BAR MECHANISM ·····················································16
F. STICH REGULATOR MECHANISM ·····························································································19
G. LOWER AND FEEDING SHAFT MECHANISM ··········································································21
H. FEED BAR MECHANISM ················································································································24
I. HOOK SADDLE MECHANISM ···································································································· 26
J. OIL LUBRICATION MECHANISM ·······························································································28
K. ACCESSORIES ··································································································································30
L. PNEUMATIC CONTROL UNIT ······································································································33

 Preparation for 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：

power on.

1) Never operate the machine before filling the machine’s oil pan.

2) When a new sewing machine is first turned on, verify the rotational direction of the pulley with the

3) Verify the voltage and phase (single or three) 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.

 Cautions on use：

1. Lubrication (Fig.1, Fig.2)

When a new sewing machine is
used for the first time, or sewing
machine left out of use for a long time is
used again, replenish a suitable amount
of oil to the portions indicated by arrow
in the fig.

Note: Filling the oil to the fount
timely (Fig.3). Use white spindle oil.

— 1 —

2. Cautions on operation

1) When the power is turned on or off, keep foot away from the pedal.

2) It should be noted that the brake might not work when the power is interrupted or power failure
occurs during sewing machine operation.

3) Periodically

clean the machine.

 Operation

1. How to attach needle (Fig.4):

Note: Before attach needle, be sure to turn off the power.

Loosen the needle clamping screw；Hold the needles so that the two
needles side with the long grooved (faces each other), and insert it as deeply as
it will go into the needle clamping holes, tighten screws.

2. How to wind the lower thread (Fig.5):

Strength of winding：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) Press lever A 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 B.

(6)Adjustment of thread winding amount, Adjust by loosening screw C and moving the adjustment plate D

a. The thread winding amount will decrease when moved in the direction of a.

b. The thread winding amount will increase when moved in the direction of b.

3. Selection of Thread（Fig.6）:

It is recommended to use “S” twist thread in the left needle (Viewed from front), and “Z” twist thread in the
right needle.
When discriminate use of needle thread is impossible, use “Z” twist thread in the needle. For bobbin thread,
“S” twist thread as well as “Z” twist thread can be used.

— 2 —

4. How to route the upper thread (Fig.7, Fig.8):

1) Pass each upper thread through thread guide A

Note: when thin slippery thread (polyester thread for example) is used pass the thread through thread

guide B as show in Fig.7

2) With the take-up lever located at the upper most position, pass each thread in the order in Fig.8.
Note: Pressing the upper thread loosening button, the upper
thread can be pulled out easily.

Adjustment of stitch length and reverse sewing

5.

1) Rotate the stitch length adjusting dial to change the stitch length

2) If the reverse lever/push-button is depressed, reverse sewing will take place.

(Fig.9 Fig.10):

6. Balance of thread tension (Fig.11):

— 3 —

7、Upper thread tension (Fig.12):

1) The upper thread can be adjusted based on the lower thread tension.

2) Adjustment can be done by rotating the thread tension nut.

8. Adjustment of pressur

1) Pressure should be adjusted according to the material

to be sewn.

2) Turning the pressure adjusting screw to adjust the

pressure of presser foot

e of presser foot (Fig.13):

9. Timing between rotating hook motion
and needle motion (Fig.14):

1) Set stitch length to “6”;

2) When needle is lifted 2.4mm from the lower dead
point, the following position relationship should be
maintained:

·The upp
the hook point

·The hook point should be located at the center of
needle axis.

· Gap between
be 0.05 mm

er edge of needle eye should be 2.3mm below

the hook point and the side face of needle should

10. Adjustment of Feed dog height (Fig.15):

Height of feed dog should be adjusted for individual fabrics with the
following cautions:

1) Fabric will be damaged if the feed dog extends too high or

pressure of presser foot is too large

2) Even stitch length cannot be assured if the feed dog is too low

or pressure of presser foot is too small

— 4 —

3) Feed dog height should be measur ed at the point wher e the needle

is at the top position.

For light fabric: Approx 0.8mm
For usual fabric: Approx 1.0mm
For heavy fabric: Approx 1.2mm

Adjustment procedure:

1) Lay down the machine bed toward the other side;

2) Turn the balance wheel by hand stop when the feed dog is raise to its highest position from the surface of

needle place;

3) Loosen the Screw and adjust the height of the feed dog;

4) After adjusted, tighten the screw.

The feed dog height is factory-adjusted to 1.2mm

11. Walking foot and presser foot vertical
stroke adjustment (Fig.16):

When fabric with l

arge elasticity is sewn, or when thickness
of fabric changes, the vertical stroke (movable range) of the
presser feet should be adjusted as follows:

1) Loosen the special bolt;

2) The vertical strokes of presser feet become minimum

when the crank rod is moved downward and set;

3) The vertical strokes of presser feet become minimum

when the crank rod is moved upward and set;

4) After the adjustment, tighten the special nut.

The vertical strokes of presser feet can be adjusted within a range from 2mm to 6mm.

12. Safety clutch device (Fig.17, Fig.18)

Safety clutch device is installed to prevent the hook and cog belt
from damage in case the thread is caught into the hook when the
machine is loaded abnormally operation.

1) Function of safety clutch:

A. When the safety clutch acts, the cog belt pulley will be unloaded.

Then the rotation of hook shaft will stop. The arm shaft only will
rotate. Stop the operation of machine.

B. Clean t

C. Turn the cog belt hub by hand, and check whether the hook

shaft rotates lightly and properly, place the clutch device as follows.

2) How to set the safety clutch (Fig.18)

A. While pressing down the push button on the opposite side of

bed by left hand, turn the balance wheel slowly by right hand away

from you;
B. The ba
balance wheel more firmly;

he thread thoroughly which is caught into the hook.

lance wheel will stop by the gear plate, but turn the

— 5 —

C. Release the push button, the safety clutch device is set.

3) Force applied to the safety clutch (Fig.18)

A. The force applied to the safety clutch is the smallest when the mark of eccentric pin faces the center of
the lower shaft. The force proportionally increases as the mark faces the outside;

B. To adjust the force slide the timing belt, loosen the set screw, and turn the eccentric pin;
C. After the adjustment, tighten the set screw.

Specifications:

Model

Spec

Material weight Medium Heavy material

Max. sewing speed 1200rpm

Stitch length 0-7mm

Needle bar stroke 33.4mm

By hand 8mm Presser

foot stroke

By knee 16mm

Alternating movement 2-6mm
Stitch-length adjusting Dial type
Alternating movement Automatic

Needle DP×17（22#--24#）

Motor Servo Motor 550W

GC24698-25R/GC24698-25L

— 6 —

A. ARM BED MECHANISM

25

2.4

2 3 4

(2)

21

2.2

10

'

'

(2l

-'~

.·.

·

.....

8~

(8}

(2)

:

\

— 7 —

A. ARM BED MECHANISM

Fig.
No.

A01 HA300B2090

A02 HA300B2170

A03 H4716B8001

A04 H4717B8001

A05 H4715B8001

A06 H4718B8001

A07 H2000B2010

A08 H7117B8001

A09 HA700B2060

A10 H2400B2100

A11 HA307B0673

A12 H4715H8001

A13 H4714H8001

A14 H007013050

A15 H2000M0090

A16 H3200B2100

A17 H3212B0066

A18 H3000D2160

A19 H4726B8001

A20 H4727B8001

A21 H2400B2080

A22 H2400B2070

A23 H4730B8001

A24 H2400B2060

A25 H3200B2060

A26 H7007D7101

A27 H7014D7101

Part No. Description

Rubber plug

Screw

Oil guide plate

Thread take-up cover

Rubber plug

Arm side cover (left)

Rubber plug

Arm side cover

Screw

Thread guide

Rubber plug

Push button

Spring

E-type ring

Cap

Screw

Thread guide

Screw

Thread guide

Face plate

Screw

Thread guide

Guide mounting plate

Spacer

Oil guide plate

Bobbin winder

Down-lead complete

Remarks

GC24698-25L

GC24698-25R

22

15 15 SM11/64（40）×9

11
11
11
11
11
22
2 2 SM11/64（40）×8
11
11
11
11
11
33
11
11
11
11
11
22
11
11
11
11
11
11

SM9/64（40）×6.5

SM9/64（40）×4.5

SM3/16（28）×12.1

— 8 —

B. THREAD TENSION REGULATOR MECHANISM

— 9 —

B. THREAD TENSION REGULATOR MECHANISM

Fig.
No.

B01 H2504C6510

B02 H3221B3142

B03 H3221B6812

B04 H4705C8001

B05 H4706C8001

B06 HA7311C306

B07 H4707C8001

B08 H007013050

B09 H3221B6820

B10 HA300C2030

B11 H3221B6810

B12 H4708C8001

B13 H4709C8001

B14 H3221B0683

B15 HA112B0693

B16 H3221B0684

B17 HA710B0671

B18 H3221B0682

B20 HA106B0676

B19 H3306B0661

B21 HA310B0702

B22 H4710C8001

B23 HA115B7010

B24 HA310B0701

B25 HA310B0705

B26 H3221B6817

B27 H3221B0686

B28 H32481B721

B29 H32481B621

B30 H32481BE21

B31 H4713C8001

B32 H32481BD21

B33 H4804C8001

B34 H4805C8001

B35 H3230K0751

B36 H3221B6817

B37 H4769E8001

B38 H3200B2100

B39 H3221B6819

Part No. Description

Screw

Tension releasing plate

Tension releasing spring

Screw

Lever

Screw

Mounting plate

E-type ring

Mounting plate

Screw

Nut

Spring

Push button

Thread tension stud

Thread tension disc

Spring

Thumb nut

Pin

Screw

Thread guide

Tension releasing disc

Spring

Thumb nut revolution stopper

Thumb nut

Thread tension disc

Pin

Thread tension stud

Thumb nut

Take-up spring guide

Plate complete

Thread take-up spring

Plate complete

Thread tension stud

Thread tension stud

Screw

Pin

Pin

Screw

Stopper

Remarks

GC24698-25L

GC24698-25R

2 2 9/64（40）×3
11
11
11
11
1 1 9/64（40）×7
11
1 1 GB/T896 5
11
2 2 11/64（40）×8
22
11
11
1 1 11/64（40）×14
22
11
11
22
1 1 9/64（40）×6
11
11
11
11
11
22
11
1 1 1/4（40）×23
11
11
11
11
11
1 1 9/64（40）×2.9
1 1 1/4（40）×14.5
1 1 11/64（40）×10
11
11
1 1 9/64（40）×6.5
11

— 10 —