HIGHLEAD GC0318-1 Instruction Manual

HIGH LEAD
GC0318-1/GC0318-2/GC0318-8/GC0618
BEA VY DUTY TOP AND BOTTOM FEED LOCKSTITCH
SEWING MACHINE/BEA
VY COMPOUND FEED
LOCKTITCH SEWING MACHINE
Instruction Manual
Parts Catalog
SHANGHAI HUIGONG N0.3 SEWING MACHINE FACTORY

CONTENTS
1.Instmction Manual
1. MAIN SPECIFICATIONS ................................................................................................. 2
2. INSTALL THE MOTOR ................................................................................................... 2
3. CONNECT THE CLUTCH LEVER WITH THE PEDAL ............................................................. 2
4. PREPARATION AND LUBRICATION.• ................................................................................ 3
5. REPLACE NEEDLES ...................................................................................................... 3
6. NEEDLE, THREAD AND MATERIAL TO BE SEWN .............................................................. 4
7. RUN-IN OPERATION ................................................................................... · .................. 4
8. THREADING .................................................... · ........................................................... 5
9. WINDING ADJUSTMENT ............................................................................................... 6
10. SET STITCH LENGTH AND REVERSE FEEDING ................................................................. 7
11. POSITION PRESSERBAR .............................................................................. : ................ 7
12. ADJUST THE PRESSURE OF PRESSEREOOT ..................................................................... 8
13. ADJUST THREAD TENSION ........................................................................................... 8
14. ADJUST THREAD TAKE-UP SPRING ................................................................................ 9
15. ADJUST THREAD GUIDE AND THREAD TENSION ............................................................ 10
16. TIME NEEDLE TO ROTAING HOOK ................................................................................ 11
17. REPLACE ROTATING HOOK .......................................................................................... 12
18. ADJUSTTHE HEIGHT OF FEED DOG .............................................................................. 12
19. ADJUST THE POSITION OF FEED DOG ........................................................................... 13
~
20. TIME FEED MOTION TO NEEDLE MOTION ..................................................................... 13
21. ADJUST OPENING TIME OF THE TENSION DISCS ............................................................ 14
22. LUBRICATION ADJUSTMENT ....................................................................................... 15
23. REGULAR CLEANING ................................................................................................. 16
2•.Parts Catalog
A. ARM BED AND ITS ACCESSORIES ................................................................................... 17
B. NEEDLE BAR AND TAKE-UP, ARM SHAFT AND VERTICAL SHAFT MECHANISM .................... 20
C. STITCH REGULATOR MECHANISM .................................................................................. 23
D. FEEDING AND FEED LIFTING MECHANISM ....................................................................... 25
E. PRESSER FOOT MECHANISM .......................................................................................... 27
F. PRESSER LIFTING, FEEDING MECHANISM ...................................................................... 29
G LUBRICATION MECHANISM ....................................................................................... 32
H. OIL RESERVOIR AND OTHERACCESSORIES ..................................................................... 34
I. BONNIN WINDER MECHANISM ....................................................................................... 36
J. OTHERACCESSORIES ................................................................................................... 38
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1. MAIN SPECIFICATIONS
1) Sewing material: Light-Medium material
2) Max. sewing speed: 2000 spm.
3) Stitch length: 0-8mm.
4) Needle
bar stroke: 35mm.
5) Presser fool lift: 6mm (by hand) 13mm lby
knee).
6) Needle:
DPX17 No.18-No.24
DPX17 No.14-No.18
7) Lubrication: Automatic
8) Reverse feeding mechanism: Have
2.INSTALL THE MOTOR ( Fig.1 )
Align Motor Pulley Groove ( B ) and Balance Wheel Groove ( A ) by moving the motor leftward or
rightward.
@f[A
1....----c
Fig. 1
3. CONNECT THE CLUTCH LEVER WITH TH_E PEDAL ( Fig.2 )
1) The optimum tilt angle of pedal ( A ) is approximately 15 deg.
2) Adjust Clutch Cover ( D ) so that Clutch-Lever ( C ) and Draw Bar ( B ) run in line.
3) The balance wheel should rotate counter-clockwise when viewed from the outside of Balance
Wheel ( G). The direction of the motor pulley rotation can be reversed by reversing (turning
over 180 deg . ) the power plug of the motor. .----------------------.
4) Adjust the tension of V-belt ( F ) by
turning Motor Vertical Position Screw ( E ).
The proper tension of the V-belt is a slack
of 10-20mm when the belt is depressed at
the center of the belt by finger.
Fig.2
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10-20mm
E---~
D---~:-'LI
8----
()A~r:~~
x

4. PREPARATION AND LUBRICATION ( Fig.3 )
1) Cleaning the machine
Before leaving the factory, the machine parts are coated with rust-preventive grease, which may be
hardened
and contaminated bydust during storage and shipment This grease nmstbereimved 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. Tmn the balance wheel to see if there is nmning obstruction, parts
collision, uneven resistance or abnormal noise. If these exist, adjustment mustbe made accordingly before run-in
operation
3) Oiling
(1) Required am>unt of oil
Line (A) on the oil reservoir: Max. oil level.
Line ( B ) on the oil reservoir: Min oil level.
If oil level goes down under line ( B ),
oil cannot bedistnbuted to each part of the machine,
thus causing the parts a seizure.
(2) Replenishing
'
Always use only No.18 special machine oil
for high speed sewing. Be sure to replenish oil to
Line ( A) before starting operation.
(3) Replacing oil
I
!
'
(
j
A B c
Fig.3
To replace oil, remove Screw ( C ) to drain oil. After completely draining off oil, clean the oil reservoir and
securely tighten Screw ( C ), then fill the reservoir with fresh oil.
5. REPLACE NEEDLES ( Fig.4 )
Turn the balance wheel to lift needle bar to the upper end of its stroke. Loosen Needle Clamp Screw 1.
While keeping the long groove of the needle leftward fully insert the needle shank up to the bottom of the needle
socket Then tighten Needle Clamp Screw A.
Note: Fig. ( b ): insufficient insertion.
Fig. ( c ): wrong direction oflong groove.
)(
)(
Long groove b c
Fig.4
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6. NEEDLE, THREAD AND MATERIAL TO BE SEWN
Needle Size
Thread Number Material
No.14 No.60-No.65
Cotton, Woolen
No.16 No.30-No.50 Muslin, Woolen, Tarpaulin, Thin Leather
No.22 Medimn leather, Canvas
7. RUN-IN OPERATION (Fig. 5)
Run-in operation is required for a new sewing machine, or a sewing machine left out operation for a
considerable length of time.
1) Remove Red Rubber Plugs ( A) on the top of the ann and replenish sufficient amount of oil
2) Lift Presser Foot ( B ).
3) Run the machine at a low speed ( 2000-2500spm) to check oil distnbuting condition through Oil Cheek
Window( C).
4) Perform run-in operation at 2000-2500spm for 30minutes. After a lapse of one month of service during
which the working speed is inp-eased gradually and the machine runs sufficiently well, the high speed 5000spm
can be adopted according to the nature of the work.
Fig.5
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8. THREADING ( Fig.6)
To thread the needle thread, raise needle bar to the upper end of its stroke, lead the thread from spool and
perform threading as shown in Fig.6 . To draw the bobbin thread, hold the end of the needle thread and turn the
balance wheel to lower the needle bar and then to lift it to its highest position. Pull the needle thread and the
bobbin thread is drawn up. Put the ends of needle thread and bobbin thread frontward under presser foot.
Fig. 6
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9. WINDINGADJUSTMENT ( Fig.7)
1) The wound bobbin thread should be neat and tight, if not, adjust the winding tension by tmning Tension
Stud Nut ( A) of bobbin winder tension bracket
Note: nylon or polyester thread should be wound with little tension,' otherwise, Bobbin ( D ) might break or
deform
2) When the wound thread layer does not present a cylindrical shape as shown in Fig. 7 (a), loosen Set
Screw ( B ) of bobbin winder tension bracket and slide Bracket ( C ) leftward or rightward. If thread is wound as
shown in Fig. 7 (b ), move the bracket rightward, but if thread is wound as shown in Fig. 7 ( c ), move the bracket
leftward.
After adequatelypositioning the bracket, tighten Set Screw ( B ).
3) Do not overfill the bobbin. The optimum length of thread will :fill about 80% of bobbin capacity. This can be
adjusted by Adjusting Screw ( E ) ofbobbin winder stop latch.
A------
a b c d
Fig. 7
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10. SET STITCH LENGTH AND REVERSE FEEDING ( Fig.8)
1) Stitch length can be set by turning Dial (A).
2) The figures on Face ( B ) of dial show stitch length in llilil
3) Reverse feeding starts when Reverse Feed Lever ( C ) is depressed, and the machine will feed forward
again
if Reverse Feed lever ( C) is released.
Fig.8
11.POSITION PRESSER BAR ( Fig.9)
I) Loosen lock Nut ( E) and Pressure Regulating Thwnb Screw (A).
2) Remove rubber plug from Face Plate ( B ).
3) Loosen Screw ( C ) and adjust the position of Presser Bar ( D ) till the presser foot is 6 nun above the
throat plate will the presser foot lifted
to its highest.
4) Tighten Screw ( C ) and put in the rubber plug.
5) Tighten pressure Regulating Thumb Screw
(A) and Lock Nut ( E ).
6. Orrrn
Fig. 9
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12. ADJUST THE PRESSURE OF PRESSER EOOT ( Fig.10)
Pressure of presser foot is to be adjust in accordance with thickness of materials to be sewn.
First loosen Lock Nut ( A
). For heavy materials, turn the pressure regulating thumb screw as shown in
Fig. lO( a ) to increase the pressure, while for light materials, turn the pressure regulating thumb screw as shown
in
Fig. I0 ( b ) to decrease the pressure. Then tighten Lock Nut (A).
The pressure of presser foot is recommended to be less as long as normal feeding is ensured.
a b
Fig. 10
13. ADJUST THREAD TENSION ( Fig.11,12)
In principle, thread tension is to be adjusted in accordance with materials, thread and other factors.
In practice, thread tension is adjusted according
to the stitches obtained. The needle thread tension should
be adjusted with reference to the bobbin thread tension. Tum Tension Spring Regulating Screw (
A) of bobbin
case clockwise for more tension, or turn the screw counter-clockwise for less tension.
It is common practice to test the bobbin test the bobbin thread tension as shown in Fig.12 . Hold the end of
the thread from delivery eye. If the bobbin case is falling slowly, the proper tension is obtained. The needle
thread tension can
be adjusted by setting ( 1 ) the take-up spring tension. ( 2 ) the thread take-up spring stroke
and ( 3 ) tension spring. All these adjustments will be described in the following.
,.--~~~~~~~~~~~~~~
+
Fig. 11
Fig. 12
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14. ADJUST THREAD TAKE-UP SPRING ( Fig.13,14)
1) Adjusting the thread take-up spring tension
Loosen Set Screw ( A ), tum Tension Stud ( B ) clockwise to increase the spring tension, or turn the stud
counter-clockwise to decrease
the spring tension After the adjusbnent, be sure to tighten Set Screw ( A ). The
thread take-up spring tension should be about 30g. To Attain this. First loosen Set Screw ( A), tum Tension Stud
( B ) counter-ciockwise to decrease the tension of Thread Take-up Spring ( C ) to zero, then tum Tension Stud
( B ) clockwise until Spring ( C) comes to the notch of thread tension regulating bushing, and again turn Tension
Stud ( B ) halfwayback ( counterclockwise ) After the adjusbnent. Tighten Set Screw ( A).
Fig. 13
2) Adjusting the thread take-up spring stroke
Loosen Set Screw ( B ), turn Stud ( C ) clockwise to increase the stroke or turn Stud ( C )
counter-clockwise to decrease the stroke. After the adjusbnent, tighten Set Screw ( B ).
Before leaving the factory, the thread take-up spring has properly been adjusted. Readjusbnent is needed
only in the case of special material or special thread.
~~~....;;_~~~~~~~~~~~~~~
,--------~ A
Fig. 14
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15. ADJUST THREAD GUIDE AND THREAD TENSION ( Fig.15,16)
The position of the thread guide affects stitch tightness and therefore must be adjusted according to sewing
materials
and sewing conditions.
1 2 3
Thread guide position Leftward Center Rightward
Material weight Heavy Medium Light
Fig15 shows different stitch forms. Normal stitch form should be as
shown in Fig.15 (a). When abnormal stitches cause puckering
and thread break-age,
the tension of needle thread and bobbin
thread nmst be adjusted accordingly. Fig.
15
a
b
c
d
e
1) In case needle thread tension is too strong or bobbin thread tension is too weak, as shown in Fig.15 ( b ), turn
the thumb nut counterclockWise to decrease the needle thread tension, or tighten the tension spring regulating
screw ofbobbin case
to increase the bobbin thread tension ( See Fig.16 )
2) In case needle thread tension is too weak or bobbin thread tension is too strong, as shown in Fig.15 ( c ), turn
the thumb nut clockwise to increase the needle thread tension, or loosen the tension spring regulating screw of
bobbin case to decrease the bobbin thread tension.
3) In case of the stitch forms as shown in Fig.15 ( d ) and ( e ), adjustments can be made with reference to the
above means.
Fig. 16
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16. TIME NEEDLE TO ROTAING HOOK ( Fig.17,18,19,20)
A Adjusting the needle position ( See Fig.17 )
1) Turn balance wheel by hand to bring Needle Bar ( C ) to the lowestposition of its stroke.
2) Rem>ve rubberplug from Face Plate
(A).
3) Loosen Set Screw ( B) of needle bar adaptor.
4) Move Needle Bar ( C ) vertically to adjust needle timing.
5) After the adjustment, tighten Set Screw ( B ) and put in the rubber plug. The standard needle timing ( See
Fig.18 ) is to align Timing Mark ( B ) on the needle bar and the bottom of Needle Bar Bushing ( A ) and
meanwhile align the Inner Surface (
E) of the hook and the center of Needle Eye ( D) when the needle bar gets
down
to its lowestposition.
Fig. 17
B. Adjusting the hook point timing
Fig. 18
Timing of needle motion to rotating hook motion has a great effect on sewing performance. The standard
hook point timing
(See Fig.19) is to align Hook Point ( D) and Needle Centerline ( C) when Needle Bar ( B)
is lifted by 2.2mm from the lower end of its stroke. Besides, Hook Point ( D) should be l.O-I.5mm above the
upper end
of needle eye ( E ).
When adjusting the hook point timing, also notice that the clearance between the bottom of needle notch
and Hook Point (
C) should be approx. 0~05mm (See Fig.20)
__ 'c:!1 __ _____.I l.____l_~_mm __
Fig. 19 Fig.20
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17. REPLACE ROTATING HOOK( Fig.21)
1) Lift needle bar to the highestposition of its stroke,
2) Reimve throatplate, take down needle andbobbin case.
3) Loosen Screw(
C) ofhook positioner and take down Hook Positioner (A).
4) Loosen two Screws ( D) of rotating hook.
5)
Tum balance wheel to raise feed bar to its highest position, then take down the rotating hook by turning it
away from feed bar.
6) Installing the hook
can be done in reverse sequence. Note that Needle ( B ) and the convex surface of
Hook Positioner (A) should alignwith a clearance of0.5-0. 7nnnbetween them
0.5-0. 7nm
.......
-----<C
Fig.21
18. ADJUST THE HEIGHT OF FEED DOG ( Fig.22,23 )
1) Tum balance wheel until feed dog is lifted to its highestposition from throatplate smface.
2) Loosen Screw (A) of feed lifting rock shaft crankright (See Fig.22,b)
3) Move Feed Bar ( B ) in the direction shown by the arrow in Fig. 22 ( a ) to adjust the height of the feed
dog. The standard height
of feed dog is that the top of feed dog is 0.8mm above Throat Plate Surface
( B ).
4) After the adjustment, be sure to tighten Screw (A).
Fig.22
Fig.23
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19. ADJUST THE POSITION OF FEED DOG ( Fig.24,25 )
The standard position offeed dog is that the clearance between the front end of the throat plate slot and the
first tooth of the fully advanced feed dog is 1nnn, as shown inFig.24.
I) Fully advance the feed dog toward the front end of the throat plate slot.
2) Loosen Feed Rock Shaft Crank Screw (A). See Fig.25 ( b ).
3) Move Feed Bar ( B) inthe direction shown by the arrow inFig. 25 (a) to adjust the feed dogposition.
4) After the adjustment, be sure to tighten Screw (A).
a b
Fig.24 Fig.25
20. TIME FEED MOTION TO NEEDLE MOTION ( Fig.26,27,28)
The standard timing of feed motion to needle motion is that the top of feed Dog ( C ) is flush with Throat
Plate Surface ( B ) when the point ofN eedle ( A) reaches Throat Plate Surface ( B ). See Fig.26 .
@--___....
Fig.26
Fig.27
If feed TI10tion is not timed to needle motion, adjust as follo\VS (See Figs.27 and 28 ).
1) Remove Arm Side Cover ( F ).
2) Loosen Set Screws (A) and ( D) of feed and feed lifting eccentric.
3) Hold Feed and Feed Lifting Eccentric ( B ) and turn Balance Wheel ( E) slowly until the upper edge of
Arm Shaft Oil Hole ( C ) aligns with the lower edge of Reference Hole ( G ) of feed and feed lifting
eccentric.
- 13 -

4) Leave a clearance of 0.3-0.Snnn between Feed and Feed Lifting Eccentric ( B ) and Eccentric Sleeve
( H ), then tighten
Set Screws ( A) and ( D ).
0.3-0.5mm
Fig.28
21. ADJUST OPENING TIME OF THE TENSION DISCS ( Fig.29)
within the presser foot lift range of2-7nnn opening time of the tension discs can be adjusted as follows:
1)
Reimve the rubberplug from the back of arm and loosen Screw ( A) of knee lifter lever ( left).
2) Move the tension releasing cam leftward for earlier opening or rightward for later opening. It will facilitate
the adjusttnent to
put under the presser foot a block as thick as the presser foot lift.
3) After the
adjus1:rne1l_t, fully tighten Screw (A).
Fig.29
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22. LUBRICATIONADJUSTMENT ( Fig.30 )
A. Adjusting oil pump.
In ordmaryoperation, adjustment is not required for the oil pump.
If oil splashing does not occur in the oil
check window when the machine runs at a
low, speed ( approx.2000spm ), reduce the clearance of the by-pass
hole.
B. Adjusting the lubrication of rotating hook.
The lubrication
of the rotating hook can be adjusted by Oil Adjusting Screw (A) as follows:
1) Turn Oil Adjusting Screw ( A ) clockwise to increase oil and turn Oil Adjusting Screw ( A )
counterclockwise
to decrease oil.
2) Oil Adjusting Screw ( A ) adjusts oil amount within 5 turns.
When Oil Adjusting Screw ( A ) is fully
tightened, oil amount is maximum
3) Readjustment depends on temperature, sewing speed and the like.
In practice, oil amount can be judged
as follows: remove the throat plate and place a piece of paper on instead, run the machine for about 20 seconds,
then check the oil splashed on the paper.
A
Fig.30
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23. REGULAR CLEANING ( Fig.31,32,33)
I) Cleaning feed dog (See Fig.31 )
Remwe the throat plate and clear offthe dust and lintbetween feed dog tooth slots.
Feed dog
Hook
Feed bar
Fig.31 Fig.32
2) Cleaning rotating hook ( See Fig 32 )
Swing out
the machine head and clean the hook. Wipe the bobbin case with soft cloth.
3) Cleaning oil
pump, screen (See Fig.33 )
Swing out
the machine head and clear off the dust and dirt on oil pump screen.
Screen
Fig.33
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A.ARM BED AND ITS ACCESSORIES
10 13 11 12 14 38
\
5
1
36-6
30
44
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