Global LP 9974-C User manual

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GLGBAL
PARTS BOOK I INSTRUCTION BOOK
M08El:::
EP 9971-C • LP9974-C

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LP 9971 -C I LP 9974 -C
Thank you to choose .9971-C 9974-C Post-bed compound feed lockstitcl"
sewing machine with roller.
This is a instruction book & parts list.it could help you how to use machine & how
to care ofmachinecorrectly and make you convnience to look up parts.
In order to avoid troubleoccurring, please read this instruction book carefully
before operating machine, and please accept safety operating guides which
come from special technicianes or peoples of having operatorexperiences.
1. BRIEF INTRODUCTION OF MACHINE
9971-C{Single heedle)/9974-C (Double needle) Post-bed compound feed
with roller clockstltch sewing machineisa high-grade product of Post-bed sewing
machine. It's surface beautiful and it'sstitch could be adjusted freely. before you
adjusting it, the stitch could keepnotchanging. Maintenance-free ball & needle
bearing, it
works smoothly. Owing to the combination of wheel feed and driven
rollerpresser; it'sclimbing capacity isvery
good. itisspecial suitable for sewing
high-grade leather shoes, bags &gloves etc.arcleatherproducts.
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2. MAIN SPECIFICATIONS
A. Max.Sewing Speed: 2500 needle/min.
B. ScopeofNeedle StitchAdjusted: 1.3-7mm.
C. Presser Foot Lift: 7mm.
D. Needle Travel: 41 mm.
E. Needle System: Op x 5. 11#-20#.
F. Hook Assy. Type: Vertical Hook Assy.
G. Sewing Capacity: 6mm .
H. Lubrication Way: Lubricating By Hand.
I. Motor: 370w(Clutch MotorSpecial Used For Sewing Machine).
3. BE CAREFUL
A. Before the machine leaving factory, it had al ready been checked carefully , but in
long-distance transport, it may be vibrated strongly and then the parts loosen or
wound , so before installing & using the machine , you must check it carefully . when
you ascertained that there is no trouble for rotating , no colliding , no unregular
res i stance and no unnormal sound, you could trying it.
B. Hook assy , feed wheel & thread tension regulator assy etc. parts of the machine
is easily accumulated dust, and this would affect sewing capacity. so you must
often clean it.
C. After you cleaned the machine , please oil all the position wh i ch need
lubricating use sewing-machine o il.
0. If sewing material and thread was changed or the vulnerab le parts was
replaced. the clearance of machine may be needed adjusting, in this time,
you had better to adjust it through special technicianse or peoples of having
operator experience.

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4. INSTALLATION OF NEEDLE(ORAWING 1 )
Please use DP x 5, 11#-20# needle, the thickness of needle should be decided
according to the thickness of sewing material &thread.
When you installing needle, the needle's long slot should face theoperator's left
side, then put the needle shank into needle hole, and take it up to the bottom of
needle hole, then tighten the clamping screw.
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5. THE METHOD OF PUTTING BOBBIN & BOBBIN CASE IN HOOK ASSV.
(Drawing 2t
A Open post cap assy~A).
B. Lift up bobbin lever(B).
C. Lead bobbin thread out about 50mm, then putthe end of thread in slot of
bobbin case.
D. Putthe bobbin case with bobbin in hook assy.
E. Put down bobbin lever(B).
F. Leading needle thread by left hand, rotating driving wheel by right hand, wh~n
the bobbin thread is pulled out, then put the bobbin thread on a side.
G. Closed the post cap assy(A).

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6. THE WAY OF THREADING. (Drawing 3)
VVhen threading the needle thread, the needle bar should be the position of highest
point. liftup presser feet, open the roller presser assy(pull itdown, then push italong
with the direction of arrow). then lead the end of thread from spool & threading in order.
A Leading thread through two holes of4 hole thread retainer(1 ).
B. Leading thread from right to leftthrough the right threading hole of tensioning
adjusting-plate, then leading it up and clamping itbetween small tension discs(2).
C. Go round dividing thread pin downward, pass through tension discs(3).
0. Go round thread tension plate assy(4) from right to left.
E. Leading thread up and passthrough upperthread guide(5), then passthrough
the hole of thread take upleverfrom right to left.
F. Downwardthrough middlethread guide(6),underthread guide(7) &needle bar·s
hole(B ), passthrough the hole of needle(9), and leading thread outabout 1 OOmm
forusing.
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7. ADJUSTING OFTHREAD TENSION (Drawing 4, 5, 6)
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The normal stitch of this sewing machine should be as same as drawing A showing.
If the stitch is unnormal, it may appear thread breaking or sewing material wrinkling etc.
In this time, you should adjust the tension of needle thread & bobbin thread until the
stitch is good.
A If the stitch is as same sa drawing B showing, it means thatthe tension ofneedle
thread is too high or the tension of bobbin thread is too low. You should turn tension nut
clockwiseso thatreduce the pressure ofneedle thread. Ortighten the adjusting
-screw(B} using small screwdriver to increase the tension of bobbin thread.
B. Showing as drawing C, If the tension of needle thread is too sman & the tension of bobbin
thread is too big. You should tum tension nut clockwise to increase the pressure of needle
thread. Or loosen the adjusting-screw(B) using small screwdriver to reduce the tension
of bobbin thread.

8. REGULATING THE PRESSURE
OF PRESSER FEET (Drawing7)
The pressure ofpresser feet should be regulated according to the thickness ofsewing
material. If the sewing material is more thicker, the pressure of presser feet should be
increased, in this time ,you may turn round regu lating-screw on the back of head
clockwise as drawing showing. On contrary,reduce the pressure.
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9. REGULATING STITCH LENGTH !Drawing 81
A. Press down the stitch length regulating-button (8) using forefinger of left
hand.
B. Turn round the pulley blancewheel(A) slowly by right hand.
C. When the stitch length regulating-button(B) was pressed down, you may
regulate the stitch length.
D. The figure of stitch length is shown on the pulley blance wheel(A), the
figure is more bigger then the stitch length is more bigger. Turning round the
pulley blance wheel(A} until the figure of stitch length you need aim at datum
point(C), then loosen the stitch Length regulating-button(B) and it return back
to the to the original position. Then the stitch length is regulated good.
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10. REGULATING THE GAP BETWEEN HOOKASSY AND NEEDLE !Drawing 9)
.We suggest that the gapbetween hookassy and needle should be regulated
by special technicianes or peoples having operating experiences.
A Turning round the pulleyblance wheel by hand, when the needlego up 2mm
from the lowestposition, the position of needle hole should be lower1.6mmthan
hooktop.
B. Turning round the pulleyblance wheel by hand, when
the needle go up 2mm
from thelowestposition, hooktop should aim atneedle slotand the gap is0.05mm.

TROUBLE, CAUSE & REMEDY
Trouble
Thred
Breaking
Cause
(1 )The quality of thread is pool.
(2)Caused by needle
Needle curving
Needle installing wrong
Needle is too small(compared
with thread)
(3)The tension
of needle thread ls too big.
Stitch (1 )Reasons caused by needle
Dropping Needle curving
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Thread
Floating
Needle not
fit the thickness of
thread.
(2)Reasons caused by
wrongly installing needle
When inserting needle, the depth of it is notenough.
When inserting needle, the needle
is inclined.
(1 )Tension of needle thread is too small
(2)Take-up spring is too loosen.
(3)Tension of bobbin thread is too big.
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Remedy
Replace thread which is very good.if the thickness of thread
is noteven
or there is some joint in thread, do not use it.
Replace a new needle.
Re-installing needle.
Replace a needle which
fit the thickness of thread.
Looseingthreading nut.
Replace needle.
Replace a needle which fit the thickness of thread.
Insert needle to the fixed-position plane ofneedle bar.
Re-installing needle.
Turn round tension adjusting nut colockwise to regulate needle
thread.
Adjusting the tension oftake-up spring. when sewing thicker
material(stitch length
is long}, the tension of take-up spring
should be increased.
Tighten the spring plate screw
of hook case.

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Model
INDEX
Page
A. ARM BED AND IT'S ACCESSORIES -- - - ------------------------ 1 - 2
B. UPPER THREAD TENSION REGULATOR MECHANISM ------------- 3 - 4
C. SINGLE-DIRECTION BEARING SHAFT MECHANISM ------- - ------ 5- 6
0. ROLLER PRESSER FOOT MECHANISM ----- - ------------------- 7 - 8
E. TAKE-UP LEVER MECHANISM ----- - ---- ----- ----- - ----------- 9 -10
F. UPPER SHAFT AND BALANCE WHEEL MECHANISM --------- - ---- 11-12
G UPPER SIDE SHAFT MECHANISM
-- - ------- - -------- - ------ - -- 13-14
H NEEDLE BAR MECHANISM --------------------- --------- - ---- 15-16
L NEEDLE BAR ROCKING MECHANISM --- --- --------- - ---------- 17-18
J, PRESSER FOOT BAR MECHANISM ---- ---- - - - - - --------------- 19-20
K TIMING BELT DRIVING MECHANISM --- ---- - --- - ---- - - -- ------ -21-22
L. STITCH REGULATOR MECHANISM ----- - --- - ------------------ 23-24
M FEED SHAFT MECHANISM - ------- --- -------- - - -------------- 25-26
N CLUTCH SET MECHANISM
------------ - ---------------------- 27-28
0 CENTRAL BRACKET MECHANISM - -- - -- - - -- ------------------ 29-32
P LEFT SIDE BRACKET AND CENTRAL BRACKET MECHANISM ------ 33-34
Q LEFT SIDE BRACKET MECHANISM ---------------------------- 35-38
R FEED WHEEL SINGLE-DIRECTION DRIVING MECHANISM ---- - - - -- 39-40
S RIGHT SIDE BRACKET MECHANISM --------------------------- 41-44
T ACCESSORIES ---------- - ---- - --- -- - - --- --- ------ --- ------ 45 - 48
U GAUGE PARTS LIST ----- - ---------- - ----------------------- 49
V NUMERICALPARTS-LIST ------------------ - ----------------- 50-53

A.
ZM805007
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J-i-365-0A
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ZMB06002_j
ARM BED AND IT'S ACCESSORIES
ZMC05001---cl!IO:)
J1063-0A---,~~
J1077-0A ~
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ZMB06002
.b-J1052-0A
~ZMB0~003
~A1055-0A
ZMB04011
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J1051-0A TI012-0A
~1041-0A
LzMao4011
J4.360-0A
ZMB05004

A.
Part No.
A 1055-0A
J1041-0A
J1051-0A
J 1052-0A
J 1063-0A
J1077-0A
J4360-0A
J4365-0A
T1010-0A
T1012-0A
T3030-0A
ZMB04011
ZMB04017
ZM805003
ZMB05004
ZMB05007
ZMB05010
ZMB06002
ZMC05001
ZMH04001
ARM BED AND IT'S ACCESSORIES
Name of Part
Q' TY
9971-C 9974-C
Thread Guide Wire --- --- --------- ------ 1
Stopper --------- --- ---- -- ------------ 1
4 Hole Thread Retainer -- ---- -- ---- -- -- -1
Thread Guide Wire ------- - ------------- 1
Thread Take-up
Cover --------- -- ---- -- - 1
Needle Bar Upper Bushing Cap ----------- 1
--------- -- --- -- -Bottom Cover -- ----------------------- 1
Bracket --------------------- - -------- 1
Face Plate
--------------------------- 1
Arm Side Cover ---- - ------------------ 1
Arm Side Cover ---------------- ---- - --- 1
Screw (M4X0.7X8) -------------------- 1
Screw (M4x 0. 7 X7) ------------------ -- 1
Screw (M5X O. Sx 7) -------------------- 5
Screw (M5X0.8X 10) ----- - -- - - --- ------ 5
Screw (M5X0.8X25) ----- -- ---- ---- --- -1
Screw (M5X0.8X35) ------------------- 1
Screw (M6X 1.0X 10) -- --- --- ----------- 2
Screw (M5X a.ax8) -------------------- 1
Screw (M4X0.7X4) ------------ -- ------ 1
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1
1
1
1
1
1
1
1
1
1
1
1
5
5
1
1
2
1
1
Remarks