HIGHLEAD GC24618 Series Instruction Manual

HIGHLEAD
GC24618 series
Single/Double Needle Post-bed Compound Feed Lockstitch
Sewing Machine With Roller
Instruction Manual
Parts Catalog
SHANGHAI HUIGONG N0.3 SEWING MACHINE FACTORY
From the library of: Diamond Needle Corp

— CONTENS —
INSTRUCTION BOOK
Instruction for GC24618/GC24618-1 I
Trouble shooting and remedy ^
PARTS CATALOG
A ^ ARM BED AND ITS ACCESSORIES
B. THREAD TENSION MECHANISM 9
C^ BEARING SHAFT MECHANISM
D. ROLLER PRESSER FOOT MECHANISM 13
E> THREAD TAKE-UP MECHANISM
F. UPPER SHAFT MECHANISM
G^ UPPER SIDE SHAFT MECHNISM
H, NEEDLE BAR MECHANISM 21
K NEEDLE BAR FEEDING MECHANISM 23
J, PRESSER BAR MECHANISM 25
K> TIMING BELT DRIVING MECHANISM 27
L. STITCH REGULATOR MECHANISM 29
M. FEED MECHANISM 31
N. CLUTCH MECHANISM
O. CENTRAL POST BED MECHANISM FOR SINGLE NEEDLE 35
P. GEAR DRIVING MECHANISM FOR SINGLE NEEDLE 37
Q. LEFT AND MIDDLE POST BED MECHANISM FOR TWO NEEDLE 39
R, LEFT POST MECHANISM FOR SINGLE NEEDLE 4 j
S. RIGHT POST BED MECHANISM 44
T. BEARING DRIVING MECHANISM
U. RIGHT POST BED DRIVING MECHANISM 48
V. ACCESSORIES(I)
W. ACCESS0RIES(2)
X. PRESSER FOOT FOR GC24618-1 54
SPECIAL PARTS CATALOG FOR GC24618-D/GC618-1D
Y> THREAD TENSION MECHANISM
Zi ^ KNIFE ACTUATING MECHANISM(I) 57
Z2. KNIFE ACTUATING MECHANISM(2) 59
From the library of: Diamond Needle Corp

GC24618 SERIES POST-BED COMPOUND FEED LOCKSTITCH
SEWING MACHINE WITH ROLLER INSTRUCTION BOOK
Thank you for choosing GC24618 series Post-bed compound feed lockstitch sewing machine with roller.
This is an instruction book & parts catalog, which will help you to use machine and maintain the
machine correctly while facilitate reference of parts.
In order to avoid trouble, please read this instruction book carefully before operation, and accept safety
operation guide from professionals.
1. BRIEF INTRODUCTION OF MACHINE
GC24618 (Single needle) / GC24618-I (double needle) post-bed compound feed lockstitch sewing
machine with roller is elegant in appearance, nice and even in stitches which can be freely adjusted, light and
smooth in running with ball bearing and needle bearing, excellent for heavy duty with wheel feed and driven
roller presser foot, and is especially suitable for sewing high-grade leather shoes, bags, gloves and other curvy
leather products.
2. MAIN SPECIFICATIONS
Type
GC24618/GC24618-1
Max Sewing Speed
. 2500rpm
Stitch Length
1.3 ~ 7mm
Presser Foot Lift
7 mm.(by hand)
14mm.(by knee)
Needle Bar Stroke
41mm
Needle
DPX5 11#~20#
Hook
Vertical Hook
Max Thickness to be Sewn
6mm
Lubrication
Manual
Motor
370W Clutch Motor
3. PRECAUTION
a. Though each machine has been strictly inspected and tested before leaving factory, the machine parts may be
loose or deformed after long distance transportation with jolt. So before installing & using the machine, you
must check it carefully. Examine it and ensure there is on trouble for rotating, on colliding, no abnormal
resistance and abnormal sound before you perform run-in operation.
From the library of: Diamond Needle Corp

b. The thread guide way of the parts such as rotating hook, feeding wheel and thread tension regulator assy, etc.is
apt to accLiinulate dust, which would affect sewing perfonriance. So you must clean it regularly.
c. After you clean the machine, please lubricate all the relevant points with sewing machine oil.
d. If special sewing material or special thread is used, or you want to replace those parts which will affect
clearance, please refer to the professionals.
4. NEEDLE SETTING (Fig.l)
Please use DPx5> 11#'~^20# needle only. Needle should be selected as per thread and nature of material to
be sewn. When installing needle, make sure the needle's ,
long groove(A) facing the operator's left side, then fully ^
insert the needle shank up to the bottom of the needle
I j
socket and tighten the clamp screw finally. —c—
5. WIND THE BOBBIN (Fig.2)
Put Bobbin (B) on the bobbin winder spindle, and
draw the thread (A) from spool and between two tension
discs (E), then wind the thread on Bobbin (B) several
rounds, pull up Bobbin Winder Lever (D), press Spring
Plate (C) up to Bobbin (B). When sewing, it will wind
the bobbin automatically, (if not sewing, it can wind the
bobbin with the prcsser foot lifted up.)
After winding, you may cut bobbin thread by
winding the thread two rounds on the thread culling
blade and pull it off.
From the library of: Diamond Needle Corp

6. INSTALL BOBBIN & BOBBIN CASE (Fig.3)
a. Open Cover (A).
b. Lift up Bobbin Latch (B).
c. Pull bobbin thread out about 50mm, then draw the
end of thread through the slot of bobbin case.
d. Put the bobbin case into the rotating hook.
e. Press down Bobbin Latch (B).
f. While taking the needle thread by left hand, rotate
the balance wheel by right hand to draw up the
bobbin thread.
g. Close Cover (A) again.
7. THREADING (Fig.4)
When threading, raise needle bar to the upper end of its stroke, lift up presser foot, sewing out the roller
presser foot {pull it down, then push it away as the arrow indicates). Then lead the end of thread from spool and
start threading in the following sequence:
a. Lead the thread through the two holes of Thread Pin ®.
b. Lead the thread from right to left through the right hole of the thread tension setting plate, then lead it up and
go between Small Tension discs ©.
c. Lead the thread downward round the thread dividing pin and pass it through Tension Discs (3).
d. Pass the thread round Thread Tension Guide Plate ^ ^
@ from right to left.
e. Lead the thread up through Upper Thread Guide ©. 1 d 9
then pass it through the hole of thread take-up lever I f
f. Lead the thread downward through Middle Thread
Guide ©, Lower Thread Guide ®, Hole ® on the
needle bar, then pass it through the eye of the needle
(D, and draw it out about 100mm for sewing.
From the library of: Diamond Needle Corp

8. ADJUST THREAD TENSION (Fig.S. 6. 7)
The normal stitch should be the same as Fig. (A) shows. If the stitch is abnormal, thread breaking or
puckering may appear. In this case, you should adjust the tension of needle thread & bobbin thread until the
slilch is right.
a. If the stitch is the same as Fig. (B) shows, it means needle thread tension is too strong or bobbin thread
tension is too weak. You should turn tension nut counter-clockwise to reduce the tension of needle thread.
Or tighten Adjusting Screw (B) with small screwdriver to increase the tension of bobbin thread.
b. Fig. (C) show that needle thread tension is too weak or bobbin thread tension is too strong. You should turn
tension nut clockwise to increase the tension of needle thread, or loosen Adjusting Screw (B) using small
screwdeiver to reduce the tension of bobbin thread.
NORMAL STITCH
r \
ABNORMAL STUCrH
ABNORMAL STITCH
NEEDLE THREAD
TENSION
r INCREASE
DECREASE
aY tighten
1^ /^JUSTING
a^SCREW d\
(loosen
9. ADJUST PRESSURE OF ROLLER PRESSER FOOT (Fig.S)
Fhe presser of the roller presser foot should
be adjusted according to the thickness of
material to he sewn. When sewing heavy weight
maierial. the pressure of presser foot should be
increased by turning clockwise the regulating
screw on the back of the machine head as Fig.S
indicates.
CLOCKWISK
COIINTKKCLOCKWISK
From the library of: Diamond Needle Corp

10. ADJUST STITCH LENGTH (Fig.9)
a. Press down the stitch regulating button (B) by forefinger of
left hand.
b. Turn Balance Wheel (A) slowly by right hand.
c. Stitch length can be adjusted after the stitch regulating button
is depressed.
d. The figure of stitch length is indicated on Balance Wheel (A),
the bigger this figure is, the lounger the stitch is. Turn round the
balance wheel till the desired stitch length aims at Reference point
(C), then release Stitch Regulating Button (B).
11. REGULATE CLEARANCE BETWEEN
HOOK AND NEEDLE (Fig.lO)
a. When turning round the balance wheel by hand to set the needle 2mm from its lowest position, the position
of needle's eye should be 1.6mm lower than hook point. .
b. When turning round the balance wheel by hand to set the needle 2mm from its lowest position, hook point
should aim at needle groove with the clearance of 0.05mm.
1.6infli
1
[10
HOOK POINT ^
>
3
UPPER END OF"
3
NEEDLE'S EYE-
r
LOWER END -■
OF NEEDLE
t •- - -
2mm UP
0. OSmni
SIDE VIEW
NEEDLE
CENTERLINE
HOOK POINT
OVERLOOK
From the library of: Diamond Needle Corp

12.TR0UBLE SHOOTING AND REMEDY
TROUBLE CAUSE
REMEDY
Stitch
Skipping
(1)Caused by needle:
Needle bent
Needle doesn't fit for thread.
(2)Wrong needle installation;
Insufficient insertion.
The needle deflected when
being inserted
Replace needle
Replace with a needle which is fit for thread.
Fully insert the needle shank up to the bottom of the
needle socket.
Re-install needle.
Poor
Stitches
(1) Tension of needle thread is
too weak.
(2 ) Tension of thread take-up
spring is too weak.
(3) Tension of bobbin thread is
too strong.
Turn tension nut clockwise to adjust tension of needle
thread.
Adjuat the tension of thread take-up spring.
Tighten the screw of thread tension spring of bobbin
case.
Thread
Breaking
(1 )Poor-quality thread.
(2)Caused by needle:
Needle bent
Wrong needle installation
Needle is not fit for thread
(3)The tension of needle thread is
too strong
Replace thread with high-quality one.
Replace the needle.
Re-install the needle.
Replace with a needle which is fit for thread.
Loosen tension nut.
— 6 —
From the library of: Diamond Needle Corp

A. ARM BED AND ITS ACCESSORIES
— 7 —
From the library of: Diamond Needle Corp

A.ARM BED AND ITS ACCESSORIES
Ref.
No.
Part No.
Name of part
vo
<N
o
o
vo
(N
u
o
Remarks
16
17
18
19
119687
108246
108234
168061
210210
119027
314946
119039
700335
118430
700335
119686
700335
119092
108285-1
119091
108225
Face plate
Screw
Screw
Thread take-up cover
Screw
4 hole thread retainer
Screw
Arm side cover
Screw
Thread guide wire
Screw
Thread guide wire
Screw
bracket
Screw
Bottom pan
Screw
— 8
From the library of: Diamond Needle Corp