HIGHLEAD GC24018 Installer manual

®
HIGH LEAD
Purchasing Dept
Copy
GC24018/GC24018-1
Post Bed Single(Double) Needle Lockstitch Sewing Machine
Instruction Manual
Parts Catalog
SHANGHAI HUIGONG N0.3 SEWING MACHINE FACTORY
From the library of: Superior Sewing Machine & Supply LLC

From the library of: Superior Sewing Machine & Supply LLC

--- CONTENT ---
1. Safety Precautions······································································································ 2
2. Precautions before Starting Operation··········································································· 2
:3. Precautions for Operating Conditions·································· .. ······································· 2
4. Place of Installation of Machine················································································· 2
fl. How to Mount The Machine Head onto The Table ............................................................... 2
6. MountingofTheMotor······························· .. ······················ .. ·································· .. ······ 3
7. How to Connect The Motor Lever and Foot Pedal"························· .................................... 3
8. How to Mount The Bobbin Winder Assembly ........................................................................ 3
9. How to Mount and Adjust The Knee Lifter Mechanism ......................................................... 3
10. How to Mount The Oil Pan ............................................................................................. 4
11. How to Mount The Vibration Preventing Rubber ............................................................... 4
12. Selection of Thread·················· ................................................................................. 5
13. How to Att·ach The Needle··· .......................................................................................... 5
14. How to Lead The Upper Thread······ ................................................................................. 6
15. How to Wind the Lower Thread on The Bobbin .................................................................. 7
16. How to Adjust The Bobbin Winder Assembly ..................................................................... 7
17. How to Place the Bobbin into The Hook ........................................................................ 8
18. Starting to Sewing······· ............................................................................................... 9
19. Sewing Over· .............................................. · .......................... ·· ................................ 10
20. AdjiistJuent oi" Stitch Length· ...................................................................................... 10
21. Reverse stitching ................................................................................................... 10
22. Adjustment of Thread Tension ................................................... ··· .............................. 10
23. Tension of Upper Thread··· ..................... ··· .... ,.··· ............ ······ ...... ··· ......... ······ ...... ··· ...... 11
24. Tension of Lower Thread ............................................................................................. 12
2;=J. AdJIIstuiPnt of Feed Dog Height and Pressure of Presser on Materials .............................. 13
2fi. Proper Timing Between Hook and Needle ........................................................................ 14
27. Proper Timing Between Hook and Opener ........................................................................ 17
28. Proper Timing between Feed Dog and Needle""" ............................................................ 18
29.
Cleaning and Lubrication········· ................................................................................. 19
A. ARM BED AND ITS ACCESSORIES .............................................................................. 20
B. THREAD TENSION REGULATOR MECHANISM ............................................................ 22
C NEL:DLE BAR AND TAKE-UP LEVER MECHANISM .......................................... · ............................. 24
D. l:PPEI\ SH,orr AND VERTICAL SHAFT MECHANISM .................................... · ................................ 26
E. ST JCH REGULATOR MECHANISM ................................................................................. 29
F. PRESSER FOOT ANb KNEE LIFTER MECHANISM .................................. · .......... · ................ · ...... 31
G. LOWER SHAFT AND FEED ROCK SHAFT MECHANISM· ..................................... · .............................. 34
H. HOOK SADDLE MECHANISM ................................................... · ........ ··· .............................. 37
I. OTL LUBRlCr\TION MECHANISM·········· ............................................... ··· .............................. 40
.J. ACCESSOI\1 [S .. ·..·.. ·..·..·..··.. · .... ·· .... · ........ · ...... · .... ·..·..·.. ··.. · ........ ····.. · .... ·..·..·..·..·..·.. ·..· 42
-1-
From the library of: Superior Sewing Machine & Supply LLC

From the library of: Superior Sewing Machine & Supply LLC

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 balance wheel.
(2) Power must
be turned offwhen the machine is not inuse, 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 balance wheel,
"V" belt, bobbin winder balance wheel,
or motor when the machine is in
OP.eration.
(5) Do not insert fingers into the thread take-up cover, under/around the needle, or balance wheel 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 balance wheel with
the power
on. (The balance wheel should rotate counter-clockwise when viewed from the balance
wheel)
(
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 temperature (35 OC or higher) or low temperature (5 OC or
lower) .
(2) Avoid using the machine in dusty conditions.
4. Place of Installation of Machine
The machine should be installed on well-leveled floor in order to ensure smooth operaing of your machine at
high speed without vibration.
5. How to Mount The Machine Head
onto The Table (Fig.l)
Install the hinge with screws, provided in accessory,
at hole on the back
of the bed and hook to the hinge plate
of the table, then the head is set on the table.
-2-
Hinge plate Hinge
From the library of: Superior Sewing Machine & Supply LLC

6. Mounting of The Motor (Fig.2)
The motor is mounted generally with bolts, nuts, and
washers as provided. Set the position so that the motor
pulley and the balance wheel grooves are aligned straight
as shown in Fig. 2. For proper operation when the belt is
inserted. Then connect power supply cord and motor cord
extened from switch
~
~
7. How to Connect The Motor Lever and Foot Pedal (Fig.3)
The angle of the slope of the pedal can be important.
It can make a difference in the strength necessary to press
the pedal. There might
be a slight difference in operator's
posture, but generally 3
0 o ~ 40 o angle as shown in
Fig.3
(l) is considered best. The treadle position shown
in Fig.3 (2) will be difficult. In this case, adjust the length
of the conncting rod to suit the operator.
8. How to Mount The Bobbin Winder
Assembly (Fig.4)
Set the position of the bobbin winder assembly
provided
in accessory, to be in parallel with the belt hole of
the table, with the lever pushed in operation position. When
bobbin winder pulley will come in contact with the belt,
fix
the assembly onto the table with two screws provided.
9. How to Mount and Adjust The Knee
Lifter Mechanism
(I) Place of mounting (Fig.5)
Make a hole for knee lifter shaft bracket underneath
the table according
to Fig.5 shown.
(2) How
to Mount (Fig.6)
l) Mount the knee lifter shaft bracket l while the
side
of hole for spring towards your side.
2) The other side of the knee lifter shaft bradket is
screwed so as able to insert the knee lifter shaft
7.
3) On the knee lifter shaft, mount the knee lifter
position bracket 3, regulatingrod bracket
9, knee
x(2) ~
Knee Ii fter shaft bracket
mountin lace
\
\
Shaft center
Table top plate
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4
From the library of: Superior Sewing Machine & Supply LLC

plate bar bracket 2, and spring 4 in the order mentioned, and then tighten respectively.
4) Mount the knee lifter shaft 7, on which fixed
respecytive parts, on the shaft bracket
1.
5) After checking up all the parts and inclination of
the knee lifter shaft, tighten the shaft bracket
screws.
6) The shorter side of knee plate bar 6 is mounted
on the bar bracket
2, and longer side of the bar is
mounted on the knee plate 5.
7) The end of spring is inserted into a hole of the
shaft bracket (front)
1.
8) The other end of spring is placed on the knee
plate bar moving
it.
9) After mounting all these parts, check whether
the knee lifter mechanism can be operated
lightly.
(3) Adjustment (Fig.7)
1) Place of knee lifter position bracket. Since the
position bracket makes standardize the starting
point
of knee plate, tighten the screw at the
proper position so that the stopper
of position
bracket come contact with top underneath
of the
shaft bracket (back).
2) Position of the knee lifter bell crank regulating
rod and its bracket. The regulating rod 3 makes
raise and down the presser foot by means
of
moving the bell crank lever 1 up and down.
While the presser foot downed adjust the length
A loosening the regulating rod screw so that the
rod and crank lever contacts with
as shown in
Fig7.
10. How to Mount The Oil Pan
Fit the oil pan with nails into the hole bored in the
table
so as not to come into contact with the knee lifter
mechanism
2
11. How to Mount The Vibration Preventing Rubber (Fig.8)
6
7
A
13mm
8
The vibration preventing rubber 1 is used to prevent the machine from vibrating and there by provide
smooth operation
of the machine. Fit these rubber insulators properly at the four corners of the table as shown in
Fig. 8. Remember, the machine will vibrate if these are not mounted properly.
(
1) Hollow out four corners of the table 20 mm radius and 13 mm depth to fit the rubber insulators. Be sure
to give smooth surface to "A" where hollow out is made.
(2) Nail the vibration preventing rubbers down at the
four corners.
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12. Selection of Thread (Fig.9)
For nest results, use high quality machine thread. For
upper thread
use left-twist thread. To check whether a
thread
is left-twist or right-twist, hold the thread as
shown in Fig.9, and twist the thread held in the right hand
toward your side.
If the thread twist becomes loose, the
thread
is right-twist, and if the thread twist becomes tight
the thread
is left-twist.
13. How to Attach The Needle
(1) For one needle type (Fig. 10)
1) While the presser bar lifter is raised, turn the
balance wheel by hand
to raise the needle bar to
its highest position.
2) Move the roller foot 1 to the left as shown in
Fig
10.
3) Loosen the needle clamping screw 2.
4) Hold the needle to its side with the long groove
side (left). Then insert the needle
as deeply as it
will
go into the needle clamping hole.
5) Securely tighten the needle clamping screw 2.
(2) For two needle type (Fig. II)
1) While the presser bar lifter is raised, turn the
balance wheel by hand
to raise the needle bar to
its highest position.
2) Move the roller foot to the left as shown in
Fig.11.
3) Loosen the needle clamping screw.
4) Hold the needles so that the two needles side
with the long grooved (face
to face), and insert
it
as deeply as it will go into the needle
clamping hole
5) Securely tighten the needle clamping screw.
Caution: When using nylon or silk threads, the
loops may be formed improperly or stitch skipping
-s-
r
0
:::l
(l'q
(l'q
....
0
0
<
CP
a..
(f)
-·
a..
CP
CP·
-h
c:.
0
0
:::l
(")
Ql
<
CP
(f)
a..
CP
,...._
....
(l'q
-::;-
c+
~
r
0
:::l
(l'q
(l'q
....
0
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CP
a..
a..
CP
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Ql
(")
CP
c+
0
-h
Ql
(")
CP
~
9
10
11
From the library of: Superior Sewing Machine & Supply LLC

may result due to the twist of these threads. In
this case, observe the concli tion of the loops and
mount the needle. In a manner that the needle hole
would be positioned in a slightly oblique
direction. (Fig. 12)
14. How to Lead The Upper Thread
(1) For one needle type (Fig. 13)
l) Raise the thread take-up lever to its highest
position turning the balance wheel
by hand.
2) After the presser bar lifter is raised, move the
roller foot
to the left holding downward as per
arrow shown in Fig.l3.
3) Thread in the order from CD to ®, and then
pass the needle from the left
to the right.
(Fig.l4)
~~~~--CJ)
PJI-.----@
r-------®
(2) For two needle type (Fig. 15)
14
l) Raise the thread take-up lever to its highest
position turning the balance wheel by hand.
2) In case of the roller foot, it is same order as one
needle type did-move the roller foot
to the left.
3) Thread in the following order (left): Ll, L2, L2',
L3, L3', L4, L5, 6, 7, LS, 7, 9, LlO, Lll.
4) Thread in the following order (right) Rl, R2,
R3. R4. R5, 6, 7, RS, 7, 9, RIO, Rll.
5) Thread from the inside to outside.
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Needle sectional plan
-·~-
'<:5
Usual thread
Roller foot
-./S:A
'<:51~--
Nylong
Silk thread
~\
13
(L8, R8) (L3') (L2') (L1) (Rl)
(L4) (L3) (L2)
(R2)
(R3)
(R4)
(L5, R5)
(6)
(7)
(9)
(L10,R10)
(L11)
(R11)
15
From the library of: Superior Sewing Machine & Supply LLC

(2) For two needle type (Fig.22, 23, 24)
1) Raise the needle bar to its highest position
turning the balance wheel
by hand.
2) In the event of the roller foot 1 is attached,
move
it to the left as shown in Fig.22.
3) Move the both slide plate.
4) Turn up the both of the latch lever2 as shown in
Fig.22
5) Pull out the bobbin thread for about 5
em, and
hold the bobbin.
6) Fit the bobbin into the both hook base.
7) Flap down the both latch lever 2
as it was.
8) Insert the pulled thread end through slit 5 of the
hook
9) From the slit 5
of the hook, pass the thread
through underneath
of the hook body 4, pull the
left thread
to the left and the right thread to the
right diagonally and the thread will pass
through the tension spring 6
as shown in Fig.23.
1
0) Leave the end of the thread inserted through the
tension spring 6
as it is.
11) While holding the end of two upper thread by
left hand, turn the balance wheel slowly once
around by right hand.
12) Then the two upper thread will hook out pulling
the lower thread simultaneously through the
hole
of needle plate, and leave the lower thread
to the other side of the needle plate as shown
Fig.24
13) After placing the bobbin, close the both
of the
slide plate.
18. Starting to Sewing (Fig.25)
(1) Raise the presser bar lifter.
(2) Move back the roller foot toward your side
as shown in Fig. 25 by the arrow.
(3) Place starting end of the materials for
stitching under the needles.
(4) Turn the balance wheel by hand toward your
side so that the needle stitches the materials.
(5) Lower the presser bar lifter and start to
sew.
Caution: When starting to sewing, leave the
Thread
23
24
upper thread pulled out by approx. 10 em in length so that it will not pull out form needle.
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From the library of: Superior Sewing Machine & Supply LLC

19. Sewing Over (Fig.26)
lever comes '
(1) Stop sewing when the take-up
to its highest position.
(2) Raise the presser (roller or ordinary)
foot.
(3) Pull out the stitched fabrics diagonally
to the left side.
(4) Cut both upper and lower thread.
Caution: When cutting the thread leave out
approx. 10 ern length so that next starting sew is
convenient for you.
20. Adjustment of Stitch Length (Fig.27)
Stitch length can be adjusted with lever
pushed and the stitch-regulating dial 3. Figures
on the stitch-regulating dial 3 indicate the
length in rnrn. When the dial number is set on the
pin of the arm, it will give your desired stitch
length.
21. Reverse stitching (Fig.27)
Reverse stitching can be operated by means of
pushing the reverse lever 4 downward. While the
lever 4 is pressed downward, reverse stitching
ca.n he made.
22. Adjustment of Thread Tension (Fig.28)
The thread tension varies according to the
type of rna terials to be sewn, thread and the
stitch length. So adjust the tension acccordingly.
If the upper and lower thread tens ion are well
balanced, the two thread will link together in the
middle of the fabrics to provide perfect chain
like stitches A as shown in Fig. 28. If, either the
upper or lower thread tension is too tight, or too
loose, it will give imperfect stitches such as B
and Cas shown in Fig. 28. Fig. 28 B shows the upper
t.hrPad tension is too tight, and Fig. 28 C shows
t lw
tipper thrt->ad tension is too loose.
-IO-
26
27
I c;··-----
't .,. ______ _
-------
OA
28
From the library of: Superior Sewing Machine & Supply LLC

23. Tension of Upper Thread
Adjustment of the upper thread tension can be
ach1eved
by changing the pressure of the tension discs of
the regulator, as well as the strength and operating range
of the thread take-up spring.
(1) For one needle type: Pressure
of the thread tension
discs. For general fabric stitching, the desired tension can
be obtained
just by adjusting the pressure of the tension
discs.
To tighten, turn the thread tension nut to the right.
To loosen, turn to the left (Fig.29). For two needle type:
To tighten the pressure of thread tension discs, turn the
thread tension nut 1 to the right.
To loosen, turn the
tension nut
to the left (Fig.30).
(2) Strength
of the thread take-up spring. Adjust the
strength
of the take-up spring according to the materials
to be stitched.
Standard materials ............... Approx. 25g
Light materials ··················Approx. 20g
Heavy materials ... ···············Approx. 30g
How to adjust
Lt>ave the presser bar l i ft.er down. Remove the
29
30
faceplate. Loosen the small screw 2, 6 inside of the faceplate as shown of the upper thread
tellston regulator (one needle type) or of the thread tension controller (two needle type). Fit
screw drive into the groove of the thread tension stud 3, or thread controller stud 5, and turn
stud to the left to strengthen, and to the right to slacken. After adjusting, tighten the small
screw and put the faceplate back on. (Fig. 31, 32)
- 11-
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(3) The operating range can be measured when the
take-up lever
is at the highest position. When the upper
thread
is pulled, and the tension spring moves within the
width
of 8 nnn, it is considered as standard. (Fig.3 3)
Standard materials ..··.. ·.. ····..Approx. 8 mm
Light materials""" ............... g mm or up
Heavy materials ..................... g mm or less
How to adjust (One needle type) (Fig. 34)
Lower
the presser bar lifter. Loosen the
thread tension regulator set screw 1. Fit the
screwdriver into the groove of the tension
regulator stud 3, and turn tlte stud to the right
to small the operating range. Turn the stud to the
left to large the operating range. After adjusted,
tighten the screw.
How to adjust (two needle type) (Fig. 35)
Loosen the thread controller set screw 1. Fit
the screwdriver into the groove of the thread
controller stud 3, and turn the stud to the right
to small the operating range. Turn the stud to the
left to range the operating range. After
adjusting, tighten the screw.
24. Tension of Lower Thread (Fig.36)
35
There is virtually no need to adjust the lower thread tension, except for special kind of
fabrics or thread, when slight adjustment will be necessary.
(1) Turn the balance wheel by hand, and stop when the thread take~up lever comes down to
[ts lowest position.
(2) Move the slide plate to that you find .the thread tensiort screw 3 of the hook base.
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(3) Fi i the screwdriver into the hole 2 of the
hook shaft bracket J as shown in Fig. 36. Turn the
tension screw to the right to strengthen the
thread tension.
(4) Turn the screw to the left to weaken the
thread.
25. Adjustment of Feed Dog Height and
Pressure of Presser on Materials
The feed dog height and pressure of presser on
materials must be properly adjusted according to
Hw materials t.o be sewn. In case of light
materials: The material may be damaged if the feed
dog is raised excessively or the pressure of
presser on materials is too strong. In case of
heavy materials: It will not make uniform
stitching if the feed dog is not raised properly
or the pressure of pr~sser is too weak. (Fig. 37)
Standard materials .... ········Approx. 1. 0 mm
Light materials .. ················Approx. 0. 8 mm
Heavy materials··················Approx. 1. 2 mm
(1) Ajustment of feed dog height (Fig. 38)
1) Lay down the machine bed toward the other
side.
2) Remove the gearbox
:3) Turn 1he balance wheel by hand and stop when
the feed dog is raised to its highest position
from the surface of needle plate.
4) Loosen the screw of feed lifting rockshaft
crank.
5) Adjust the feed dog to the desired height
moving the feed lifting rockshaft crank back
and forth as per as arrow shown in Fig. 38
6)
After adjusting, tighten the screw of feed
lifting rockshaft.
@ ®
36
~"":
1. 2mm
I
~------------~
@ ®
- 13-
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(2) Adjustment of pressure of presser foot
(Fig. 39)
1) Turn the pn'sser -regulating thumbscrew to
the right to strengthen the pressure of
presser foot.
2) Turn the screw to the left to loosen the
pressure of presser foot.
39
26. Proper Timing Between Hook and Needle
Place and adjust the hook in t.he condition
described below in case of the thread gets
entangled in the hook, or when its position 1s
changed due to shock, or other causes, or when it
is replaced with new one.
( 1) How to remove the hook (Fig.40, 41, 42)
1) Turn the balance wheel by hand and stop when
the thread take-up lever comes down to its
lowest pos i ton.
2) Remov<~ the slide plate, then take out the
bobbin.
3) Remove the needle plate.
4) Remove the hook coverplate (front) (in case
of two needle type, remove the hook cover
plate (upper) both the front and back.)
5) Remove the hook opener screw 3, and then
41
remove the opener 1.
6) Loosen the hook gib screw and remove the
hook gih fized in front of the hook body as
®
s\JOWII ill Fig 41.
7) Hold the latch ]ever up turning it slightly
so that it can be taken out.
8) Remove the hook body center set screw 6 so
that it can be t<1ken out.
42
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(2) How to place the hook (Fig.43, 44)
1) Place the hook in backward order from
removing
procedure.
2) When placing the hook body, remember to
place it at the same position as it was
taken out.
3) When inserting the hook base 3, hold the
hook base cap 1 and turn it to the left as
shown in Fig. 43, and fit the hook base
bring into slot of the hook body on the
inside of the other side.
4) When placing the needle plate, place the
needle plate adjusting the hook base so
that the tip of hook base fits into the hook
finger of the needle plate as shown in
fig. 44.
(3) The position of the hook and needle (Fig.45)
As shown in the Fig. 45, when the needle raised
·is 2. 0 mw from its lowest position of the needle,
the hook and needle should be as follows.
Upper part of the needle hole ..· ·" ... ··· ··· Lower
by 1. 6mm from the tip of hook.
Tip
of hook .................. At center of needle.
Cap between tip of hook and lateral face of
needle ........................ By 0. 05rnm.
Adjustment of the relative position of the
hook and needle can be done as follows:
1) Adjustment of needle bar position (Fig. 46)
Adjust the needle bar timing so that the gap
between the tip of hook and the upper part of
needle hole will be 1. 6 mm when the needle 1s
raised by 2. Omm from its lowest positi~n.
A. Raise the needle bar by 2.0 mrn from its
2.0mm
Center of needle
lowest position turning the balance wheel by hand.
B. Loosen the needle bar connecting stud screw 2.
-15-
43
44
0. 05mm
45
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C Adjust moving the needle bar 3 up and down
so that the tip of hook comes at the
posit ion by l. 6 rum from the upper part of
needle hole.
D. Aft(:T adjusting the needle bar position,
tighten the needle bar connecting stud
screw.
2) Adjustment of tip of hook (Fig.47, 48)
Adjust so that the tip of hook comes to the
center of needle.
A. Remove the ttecdle plate and slide plate.
B. Lay down the machine head toward the other
side.
C Remove the gearbox·.
D. Loosen the two setscrE'WS of the hook shaft
gears.
E. Turn the balance wheel hy hand, and stop
when the needle is raised 2. 0 rum from its
lowest position.
F. Turn the hook by hand enabling the tip of
hook to come to the center of needlt'.
In case of one needle type
G. After adjusting, tighten the two setscrews of the hook shaft gears.
H. Place the gearbox.
In case of two needle type
48
:3) .idjust that the gap between the t.ip of hook
and lateral side of the needle to come to 0. 05 mrrL
Jn case of one needle, there is virtually no
-16-
In case of two needle type
46
47
49
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need to adjust it. However, in case of two needles,
it is necessary to adjust it when changing the
In case of two needle type
needle guage s1zes. (Fig. 49, 50)
A. Loosen the screws 1 of the hook post cover
plate 2 (front and back).
B. Lay down the machine head toward the other
side.
C. Remove the gearbox.
D. Loosen the hook shaft gear setscrews 4.
E. Loosen the setscrews of hook shaft bracket
3, 5.
F. Turn the balance wheel by hand, and stop
50
when the needle is raised by 2. 0 mm from its lowest position.
G. Turn the hook by hand and bring the tip of hook to the center of needle.
H. Move the hook shaft bracket of the right and left, so that the gap between the tip of
hook and lateral side of needle is 0. 05mm.
I. After adjusting, tighten the setscrews of hook shaft gear and bracket.
]. Place the gearbox.
27. Proper Timing Between Hook and Opener (Fig.Sl)
I) Remove the slide plate.
2) Turn the balance wheel by hand, and stop at
the position where the opener 7 and the needle
plate are furthers point apart.
3) Check whether the gap between the part of
hook base 6 and the opener is approx. 0. 2 mm as
shown in Fig. 51. (There 1s a slight difference
according to the thread to be used.)
4) In case the gap is too wide or narrow, adjust
it fitting the screwdriver into a driver hole of
thP l1ook shaft bracket, then loosen the opener
adjustable screw 8 and moving the opener to the
right or left.
5) After adjustment, tighten the opener
adjustable screw.
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51
From the library of: Superior Sewing Machine & Supply LLC

28. Proper Timing between Feed Dog and Needle (Fig.52)
The proper timing of the feed dog and needle
will be as shown in Fig: 52. When the material is
ft•ed through and the needle tip reach to the
ueedle plate surface, just at the moment the feed
dog begins to sink downward through the needle
plate surface as shown in Fig. 52.
This adjustment is based on the feed dog height
1 s at 1. 0 Illm
(1) Loosen the arm side cover thumbscrew.
(2) Move the side cover to the right, and open
to upper side as shown in Fig. 52
(:3) Loosen the two setscrews 2 of the feed
lifting cam 3.
Needle plate
Feed dog
52
(4) While holding the feed lifting caw by hand, turn the balance wheel 1 toward your side
so that feeding device will be faster.
(5) ln order to slow the feeding device, turn the balance wheel toward the other side.
(6) After adjustment, tighten the setscrews of the feed lifting caw.
29. Cleaning and Lubrication (Fig.53, 54, 55,· 56, 57)
(1)
Cleaning
The teeth of
feed dog, hook,
upper
thread tettsion
regulator discs, and
tl1read coutroller discs
are often
covered by dust and lint caus1ng
improper operation and uneven stitching.
ThereforP, clean as often as necessary.
(2) Lubrication
Lubricatiou IS one of the most
important phases of the machine
lllcliutew:mce. With improper lubrication,
excess abrasion of machine parts will
cause to shorten the life of the machine.
TlwretorP, lubricate in the order as
follows:
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From the library of: Superior Sewing Machine & Supply LLC

1) The number of times for lubrication.
A. Usual working ··· .................. ······ ······ ... at 2-3 times per week.
B. Continuous working, every day ............ once each day
2) Volume of lubrication
Places o---- marks ...... approx. 5cc or more
Places marks ........ · approx. 5-6 drops
Places marks ........ · approx. 1-2 drops
3) Places where to lubricate
Lubricate the place where arrow is shown
in Fig. 53.
(3)
Grease
1) Remove the oil hole screws A and B. of the
gearbox fixed to arm and hook shaft, then
grease into the holes periodically.
2) Remove the gear case of the left side of
hook shaft, then also grease into the
gears sufficiently.
56
-19-
Hook shaft left
Gear case
54
55
57
From the library of: Superior Sewing Machine & Supply LLC