HIGHLEAD GC20698-6 User manual

Compound-Feed, Heavy Duty Lockstitch Sewing
Machine
GC20698-5/-6/-7/-8
Instruction Manual
Parts Catalog
S
HANGHAI BIAOZHUN HAILING SEWING MACHINERY CO., LTD
.

—INDEX—
OPERATION INSTRUCTION
1. PRECAUTIONS BEFORE STARTING OPERATION ……………………..…………………..……….....1
2. SPECIFICATIONS .……………………………………………………………………………...….………1
3. SETTING UP THE MACHINE………………………...…………………………………………....………2
4. OILING…………………………………………………………………………………………….….……...2
5. NEEDLE…………………………………………………………………………………………….….…….3
6. THREAD……....…………………………………………………………………………………….…….…4
7. WINDING THE LOWER THREAD ON THE BOBBIN……………………………………………………4
8. REMOVE AND INSERT THE BOBBIN……………………………………………………..…….…….…4
9. THREADING THE NEEDLE….……..………………………………………………...………………....…5
10. REGULATING THE THREAD TENSION…...………………………………….………………….………5
11. ADJUSTMENT OF THE STITCH LENGTH..…………………………………………………….…..……6
12. ADJUSTMENT OF THE PREESURE ..…………………………………………………….…..…………..6
13. REVERSE STITCH……………………………………….………………………………………….....……6
14. WIDTH OF ZIGZAG AND LENGTH OF STITCH…………...………………….…...…………………...7
15. ADJUSTMENT THE HEIGHT OF THE FEED DOG…..…………………………………………………7
16. TIMING BETWEEN THE HOOK AND THE NEEDLE......….……………………………….……….…...8
17. ADJUSTMENT OF BOBBIN CASE OPENER......….……………………………….……….….................9
18. THE HEIGHT OF THE PRESSER FEET …………………………………………..………………….…..9
19. TIMING OF THE VIBRATING AND LIFTING PRESSER FEET………………………………………..10
20. THE CLEARANCE OF THE VIBRATING AND LIFTING PRESSER FEET…………………………10
21. ADJUSTMENT OF THE THREAD CONTROLLER SPRING………………………..………………….11
22. REPLACEMENT OF THE CONNECTION BELT………………………………………………………...11
23. TO RE-ENGAGE THE SAFETY CLUTCH…………………………………………………………….....12
24. ADJUSTMENT OF THE OILING FOR THE HOOK SADDLE………………………………………….13
PARTS CATALOG
A. ARM BED AND IT’S ACCESSORIES…………………………………………………………….………14
B. ARM SHAFT MECHANISM……………………….……………………………………………...………17
C. PRESSER FOOT MACHANISM……………………………………………..………………….….……..20

D. STITCH REGULATOR MACHANISM…………………………………………………..……………23
E. HOOK SHAFT MECHANISM..…………………………………………………………………….…..…26
F. THREAD TENSION REGULATOR MACHANISM……..…………………………………….………....29
G. PARTS FOR SINGEL NEEDLE………………………………………………………………….…..…32
H. PARTS FOR TWIN NEEDLE………………………………………………………………….………..…34
I. SPECIAL PARTS FOR 20”…………………………………………………………………………………35
J. ACCESSORIES…………………………………………………………………………………………….37

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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 higher）or low temperatures（5℃
or lower）.
（2）Avoid using the machine in dusty conditions.
2. SPECIFICATIONS
GC20698-5 GC20698-6 GC20698-7 GC20698-8
MAX. SPEED (s.p.m.) 1,200
MAX. STITCH (mm) 10
MAX. LIFT OF FOOT (mm) 20
NEEDLE DY × 3 (standard No.24) ·SY5213 · 794
BOBBIN SIZE (mm) Φ37× 13
WORKING SPACE (mm) 508 × 153 762 × 153
BED DIMENSION(mm) 846 × 230 1，100 × 230
NEDDLE SPACING ─
3/4”
(19mm)(standard)
1/4 ”(6.4 mm)～
1-3/4”(44.5mm)
─
3/4”
(19mm)(standard)
1/4 ”(6.4 mm)～
1-3/4”(44.5mm)

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USE FOR:Tent,Sailcloth,Rubberized,Fabrics,Heavy Synthetic, Heavy Upholstery Materials,Fiber
Plate,Leather,Etc.
3. SETTING UPTHE MACHINE（Fig. 1）
Setting up the machine on the table after removed two pieces of supporting bolts（A）under the bed.
Fig.1
4. OILING（Figs. 2, 3, 4 & 5）
Oil should be applied at each of the place designated by arrows in Figs. 2, 3, 4&5.
Fig.3
Fig.2 Fig.4

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Fig.5
To fill the oil for reservoir of hook saddle from the hole after taken out the oil gaugeA
（Fig. 6）and pour the
oil until the oil level reached to the upper reference line B of the oil gauge（Fig. 6-1）.
When in continuous use, it should be oiled at least twice a day.
Fig.6 Fig.6-1
5. NEEDLE（Figs. 7 & 8）
HIGHLEAD GC20698-5,-6,-7,-8 series machines are set up to use standard needle of DY×3
（standard No. 24）·SY5213·794. The size of needle to be used should be determined by the size of
thread, type and thickness of the sewing materials.
To insert the needle, turn the machine pulley over toward you 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 outside.
Tighten the needle set screw securely.
Fig.7 Fig.8

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6. THREAD（Fig. 9）
Normally, left twisted thread is used for upper（needle）thread.（But, for left side needle of
twin-needle machine, it can be finished in fine results with right twisted thread）.
LeftTwist RigthTwist
Fig.9
7. WINDING THE LOWER THREAD ON THE BOBBIN（Figs. 10 & 11）
Pass the thread through（1）-（4）, and wind several times around the bobbin, which set up to the shaft of
bobbin winder.
Press the lever（5）to arrow direction, then the bobbin winds the thread automatically, in engage with the
operation of the machine.
The bobbin will automatically be stopped after the bobbin is filled with thread.
Fig.10 Fig.11
8. REMOVINGAND INSERTING THE BOBBIN（Figs. 12 & 13）
Draw back the side plate（1）on the bed of the machine, and raise the hinged latch（2）to a vertical position,
then remove and insert the bobbin.
Insert the bobbin and pull thread（3）out about 4-5cm, then push down the hinged latch（2）and draw the
thread end under the tension spring（4）.
When closing the side plate（1）, leave just enough space for the thread to pass through.
Fig.12 Fig.13

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9. THREADING THE NEEDLE（Figs. 14 & 15）
Pass the thread from thread guide（1）-eyelet（2）-tension disc（3）-tension thread guide（4）–guide（5）
-thread take-up spring（6）–guide（7）-take-up lever（8）–guide（7）-lower guide（9）-self threading needle
bar thread guide
（10）-through the eye of the needle（11）.(Remark) Wind the thread a single time to tension
thread guide（4）.
With the left hand hold the end of the needle thread leaving it slack from the hand to the needle. Turn the
machine pulley over toward you until the needle moves down and up again to its highest point, thus
catching the bobbin thread, draw up the needle thread, and the bobbin thread will come up with it through
the hole in the feed dog.
Lay the thread back under the presser feet and close the slide.
Fig.14 Fig.15
10.REGULATING THE THREAD TENSION（Figs. 16 & 17）
The tension on the needle thread is regulated by the thumb nutA（Fig. 16）.
The tension on the bobbin thread is regulated by the screw of the tension spring on the outside of the bobbin
case B（Fig. 17）.
To increase the tension, turn over nut A or screw to the right, and to decrease the tension, turn over nut or
screw to the left.
Fig.16 Fig.17

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11.ADJUSTMENT OFTHE STITCH LENGTH（Fig. 18）
The length of stitch is regulated by pressing down the button（1）with left hand, while turning the machine
pulley（2）slowly with right hand in the condition of setting the top of button（1）to the feed eccentric.
To increase the length of stitch, turn the machine pulley over toward you.
To decrease the length of stitch, turn the machine pulley to opposite direction.
When the desired length of stitch is obtained, operate the machine after fully confirmed releasing the button
（1）to the original position.
Fig.18 Fig.19
12.ADJUSTMENT OF THE PRESSURE（Fig. 19）
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.
13.REVERSE STITCHING（Fig. 20）
The chain for the feed reversing pedal is connected to the hook of feed reversing lever A underneath of the
bed of the machine.
To feed the work toward you, press down firmly on the feed reversing pedal, and do not stop to press down
on the way.
Fig.20

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14. RELATIVE POSITION OF VIBRATING AND LIFTING PRESSER BAR,
OF THE NEEDLE AND THE NEEDLE HOLE OF THE FEEDER（Figs. 21 & 22）
The distance between the vibrating presser bar（1）and lifting presser bar(2), after adjusting the feed eccentric so
that there is no feed movement of the needle bar, should be 15.5 mm
（one needle）and 14.5 mm（two needle）.To
adjust by the screws for connecting crank (3).
Normally, relative position of the feed dog against the needle, the needle should be passed through the center of
the needle hole of the feed dog .
To adjust by the screw for the feed rock shaft bell crank(4).
Securely tighten the screws after finished adjustment.
Fig.21 Fig.22
15.ADJUSTMENT THE HEIGHT OFTHE FEED DOG（Figs. 23,24 & 25）
The maximum height of the feed dog from the surface of the needle plate is normally 1.3 mm.
To adjust this height by the screw on the feed lifting cam fork of the feed bar and raise or lower the feed dog, as
may be required, and retighten the screw（1）.
Fig.23
Fig.24
Fig.25

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16.TIMING BETWEEN THE HOOK AND THE NEEDLE（Fig. 26）
Set the feed eccentric with the button at no feeding position, and confirm the length between vibrating and
lifting presser bar should be 15.5 mm.
If the needle bar and sewing hook are correctly timed, the point of the
hook will be at the center of the needle when the needle raised 3.8
mm + 0.5 mm from the lowest point.
1) Adjustment of the timing
（1）For the adjustment of timing, loosen 2 screws（1）for hook
driving gear, and tap this gear to the right or left in clearance of 2 mm
on the hook driving shaft until the point of the hook is at the center of
the needle.
（2）Tapping to the right gives on earlier hook timing, and to
the left gives later hook timing.
（3）Except the above case, to adjust in changing gear condition
between hook driving gear（2）and hook shaft gear（3）.
（4）Securely tighten the two set screws for hook driving gear
after finished adjustment
2) Adjustment of the cleraance
Normal clearance between hook point and scarf of the needle is in
0.02 - 0.1 mm
（1）Loosen two screws（4）and（5）for hook saddle.
（2）Move hook saddle to right or left, as may be required, until
hook point is as close to needle as possible without striking it.
（3）Thensecurelytightentwoscrews.
（4）To check the needle with careful attention free from bent
before adjustment.
3) Height of the needle bar（Fig. 27）
Normal clearance between top of the eye of the needle and hook point is 2.2 mm .
In case the needle bar is incorrectly set, loose the needle bar connecting stud
pinch screw（A）and place the needle bar in correct position as required above,
then retighten the screw（A）.
Fig.26
Fig.27

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17.ADJUSTMENT OF BOBBIN CASE OPENER（Fig. 28）
（1）Turn the machine pulley or hand wheel（GC20698-6,-8 series machine）until the top of the
opener is located at the distance from the needle plate.
（2）In this position, adjust it so that the clearance A between the inside edge of the openerand the
top of the hook is about 0.3 - 0.8 mm.
（3）Securely tighten the screw B after finished adjustment.
Fig.28 Fig.29
18.THE HEIGHT OF THE PRESSER FEET（Figs. 29,30 & 31）
Normal distance between the surface of the needle plate（A）and vibrating presser foot at stopped position
of the stop lever（C）is 19 mm.
When step on the lifting pedal, the stop lever（C）will be released by the lifting lever（B）.
To change the relative lift of the presser feet, loosen the screw（1）at the above condition.
The height of lift of the presser feet is adjustable by moving the screw of presser bar lifting bracket.
Normal distance between presser bar position guide bracket（3）and presser bar position guide（4）is 7
mm.
Position of the vibrating presser foot to shift in left and right is to be adjusted by the screw
（2）for presser
bar lifting bracket and the screw（5）for presser bar position guide bracket.
Fig.30 Fig.31

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19.TIMING OF THE VIBRATINGAND LIFTING PRESSER FEET（Fig. 32）
The amount of lift of the vibrating and lifting presser feet should be regulated according to the thickness
of materials being sewn.
The feet should lift just enough to clear the materials.
As a rule, the vibrating and lifting presser feet should lift an equal height, but some grades of work may
require that they lift an unequal height.
To change the relative lift of the presser feet, loosen the screw（A）for lifting rock shaft crank and move
the vibrating presser bar upward or downward as required, then securely tighten the screw（A）.
Fig.32
20.THE CLEARANCE OF THE VIBRATING AND LIFTING PRESSER
FEET（Fig. 33）
The amount of the lift of the alternating feed for the vibrating and lifting presser feet are to be adjusted by
the lifting bell crank link screw stud（1）.
To decrease the movement in setting the stud（1）at the upper position, and to increase the movement in
setting the stud（1）at the lower position. After setting to the required position, securely tighten the stud
（1）with nut（2）.
The clearance for the vibrating and lifting presser feet are being adjusted at maximum, so that the
clearance of them should be adjusted according to the materials being sewn.
The timing position for the vibrating and lifting presser feet should be regulated by Fig. 32.
Fig.33
Upper Surface

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21.ADJUSTMENT OF THE THREAD CONTROLLER SPRING（Fig. 34）
For more controller action on the thread, loosen the set screw（1）at the right of
the controller and set the stop lever, and for less action set the stop higher.
To strengthen the action of the controller spring on the thread, loosen the spring
stud screw（4）at the rear of the stop screw and turn the spring stud（5）slightly
to the left with a screwdriver, or lighten its action turn to the right and securely
retighten the spring stud screw.
Fig.34
22. REPLACEMENT OFTHE CONNECTION BELT
1) When the connection belt removed from the pulley for adjusting and or replacing
purposes of the parts（Figs. 35 & 36）
（1）Turn the machine pulley toward you so that placed the take-up lever（A）at the highest position.
（2）Turn the hook shaft with the fingers until the arrow mark（2）on the hook driving shaft bushing
collarand the red point mark（1）on the hook driving shaft bushingare directly in line.
（3）Then replace the belt over the upper and lower pulley.
Fig.35 Fig.36
2) Replacement of the connection belt when damaged（Figs. 37 & 38）
（1）Remove the upper arm plate and reservoir.
（2）Slide the connection belt（A）off from lower and upper belt pulley.
（3）Loosen the machine pulley adjustment screw（2）and two set-screws for the machine pulley
（3）, then remove the machine pulley.

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（4）Loosen the three screws in the arm shaft bushing（5）and remove the bushing（6）.
（5）Lift the belt up through the arm cap hole after removed the bushing（6）as far as possible and
draw it out through the space normally occupied by the bushing.
（6）Replace the connection belt as opposite processes as above for removing it.
（7）Securely tighten all the screws, so as to fit the arm shaft, firmly, free from looseness.
Fig.37 Fig.38
23.TO RE-ENGAGE THE SAFETY CLUTCH（Figs. 39 & 40）
The hook driving shaft and the shaft of the sewing hook are splined to prevent the hook from getting out of time.
The safety clutch located in the lower belt pulley prevents damage in the event of thread jamming in the sewing
hook by releasing the locking lever in the pulley.
Take out jammed thread from the hook.
To re-engage the clutch, press down the lock stud（A）, near the base of the arm by left hand and turn the
machine pulley backward slowly by right hand, then the safety clutch will be released.
In the case easily releasing the safety crutch, adjust the pressure by the screw（B）for lower belt pulley after
removed connection belt（C）.
To increase the pressure in turning the screw（B）to clockwise and to decrease the pressure in turning the screw
（B）to counter-clockwise.
Fig.39 Fig.40

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24.ADJUSTMENT OF THE OILING FOR THE HOOK SADDLE（Fig. 41）
Loosen the screw for the oil adjustment dial（3）and adjust oil supply by turning the oil adjustment dial
（2）. Maximum oil supply at the directly in line of the point mark（1）on the hook saddle and the center
line of the dial（2）. Stop the oil supply at the vertical position of the center line of the dial（2）.
Fig.41

A．ARM BED AND ITS ACCESSORIES
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Fig.
Nos. Parts Nos. Description
GC20698-5 GC20698-6 GC20698-7 GC20698-8
Remarks
A01 HE924B7101 Foot lifter lifting lever latch handle 1111
A02 HA100B2110 Set screw 3333
A03 HE913B8001 Collar (upper) 1111
A04 H7214H8001 screw 1111
A05 HE915B8001 Foot lifter lifting lever latch spring 1111
A06 HE916B8001 Collar (lower) 1111
A07 HA100C2170 Set screw 1111
A08 HE917B8001 Foot lifter lifting lever latch 1111
A09 HE918B8001 Foot lifter lifting lever 11
A10 HE919B8001 Pin 1111
A11 HE920B8001 Foot lifter lifting lever hinge stud 1111
A13 HE921B8001 Foot lifter lifting lever spring 1111
A14 HE048D8001 Screw 1111
A15 H7014D7101 Down-lead complete 1111
A16 HE021B8001 Nut 1212
A22 HE949B8001 Lubricating oil cup (front). 11
A23 HE950B8001 Oil pad 11
A24 HE930B8001 Oil wick (A) 11
A25 HE931B8001 Vinyl tube (A) 11
A26 HE951B8001 Arm cap (front) 11
A27 HE045D8001 Washer 1122
A28 H2015I0065 Stop screw 1122
A29 HE928B8001 Lubricating oil cup 1111
A30 HE111F8001 Set screw 1111
A31 HE929B8001 Oil pad 1111
A32 HE932B8001 Oil wick 1111
A33 HE933B8001 Vinyl tube 1111
A34 HE930B8001 Oil wick 1111
A35 HE931B8001 Vinyl tube 1111
A36 HE934B8001 Arm cap 1111
A40 H7327B8001 Arm oil plug 1111
A41 HE020B8001 Thread guide 1212
A42 HE937B8001 Face plate 1111
A43 HE938B8001 Face plate thumb screw 1111
A44 HE939B8001 Thread guide (lower) 1111
A45 HE025C8001 Screw 2222
A46 HE940B8001 Throat plate. 11
A47 HE005H8001 Throat plate screw 1111
A48 HE006H8001 Throat plate position screw 1111
A49 H3200B2130 Throat plate stop 1111
A50 HE942B8001 Bed slide (left) 11
A.ARM BED AND ITS ACCESSORIES
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Fig.
Nos. Parts Nos. Description
GC20698-5 GC20698-6 GC20698-7 GC20698-8
Remarks
A51 HE943B8001 Bed slide (right) 11
A52 HE946B8001 Bed slide stop 1111
A53 HE009H8001 Bed slide stop spring 1111
A54 HE944B8001 Bed plate (front) 1111
A55 HE013H8001 Screw 1111
A56 HE957B8001 Arm cross shaft bushing 11
A57 HE014C8001 Oil wick 11
A58 HE040D8001 Set screw 1111
A59 HE958B8001 Arm cross shaft gear 11
A60 HE017G8001 Position screw 11
A61 HE023C8001 Position screw 11
A62 HE959B8001 Hand wheel driving gear 11
A63 HE022G8001 Set screw 11
A64 HE960B8001 Set screw 11
A65 HE961B8001 Hand wheel disengaging spring plunger 33
A66 HE962B8001 Hand wheel disengaging spring 33
A67 HE963B8001 Hand wheel 11
A68 HE964B8001 Hand wheel engaging plate 11
A69 HA700F2100 Screw 44
A70 HE965B8001 Arm cross shaft 11
A71 HE956B8001 Machine supporting bolt 3333
A72 H8000H2070 Foot lifter lifting lever chain hook 1111
A73 H2000M0090 Ball oiler 5555
A74 HA700F2100 Screw 11
A.ARM BED AND ITS ACCESSORIES
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B.ARM SHAFT MECHANISM
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