UnionSpecial LF611K 100HM Setup guide

From the library of: Superior Sewing Machine & Supply LLC
CATALOG NO.
143M
First Edition
STYLES
LF611K 100HM
LF611K 10OMF
LF611K 100MG
LF611K100MR
LF611K100MW
LF611K 100MAW
LF611K 112MF
LF611K112MG
®
Finest Quality
Adjusting instruc~ions an~
illustrated parts 11st ~
Single-needle, LF600 "Standard Classn plain
feed flatbed machines for seaming operations.

From the library of: Superior Sewing Machine & Supply LLC
FOREWORD
This technical manual has been prepared to guide you in the maintenance of your new
UNION SPECIAL machine. Careful attention to the instructions for operating and
adjusting these machines will enable you to maintain the superior performance and
reliability designed and built into every UNION SPECIAL machine.
The Adjusting Instruction portion of this manual explains in detail the proper
setting for each of the components related to forming the stitch and completing the
functions of the
machine. Figures are used to illustrate the adjustments using
reference
letters to point out specific items discussed.
Adjustments are presented in sequence
so that a logical progression is
accomplished. Some adjustments performed out of sequence may have an adverse
effect on the function of other related parts.
Implementation of Preventive
Maintenance Schedule can bring about significant
improvements in operator productivity by avoiding costly equipment breakdowns.
Whenever it becomes necessary to make repairs or replace parts on your machine, be
sure to insist on genuine UNION SPECIAL Repair Parts. These parts are designed
specifically for your
machine and manufactured with utmost precision to assure long
lasting service.
This Catalog has been made on the basis of available information. Changes in
design and/or
improvements may incorporate a slight modification of configuration
in
illustrations or part numbers.
CATALOG NO. 143M
For Styles
LF611K100HM
LF611K100MF
LF611KlOOMG
LF611KlOOMR
LF611KlOOMW
LF611KlOOMAW
LF611Kl12MF
LF611K112MG
First Edition
Copyright
1987
By
Union Special Corporation
Rights
Reserved In All Countries
Printed in
U.S.A.
September, 1987
2

From the library of: Superior Sewing Machine & Supply LLC
Each UNION SPECIAL machine is identified by a Style number, which on this machine
Class, is stamped into the Style plate affixed to the right front of machine.
Serial number is stamped into bed casting at the left rear base of machine.
NOTE: Instructions stating direction or location, such as right, left, front or
rear
of machine, are given relative to the operator's position at the
machine, unless otherwise noted.
The handwheel rotates counterclockwise in
operating direction
when viewed from the right end of machine.
STYLES OF MACHINES
High speed, maximum performance, double locked stitch, plain feed flatbed machine.
Totally enclosed feed and looper drive mechanism, fully automatic forced feed
lubricating system with
easily replaceable oil filter, quick stitch change,
independently driven rear needle guard
and quick adjustable looper avoid.
LF611KlOOHM Single needle, HIGH sewing capacity machine with sewing parts to
accomodate Selvage Edge Binder -for binding mattress ticks made
from medium heavy to heavy weight materials. Uses selvage edge
binding 5/8, 3/4 and 7/8 inch (15.8, 19.0 and 22.2mm) wide to
produce a 5/16, 3/8
and 7/16 inch (7.9, 9.5 and 11.1mm) finish.
Standard
recommended needle Type 128 GAS, Size 125/049. Stitch
range 5-14 S.P.I. Maximum recoR111ended speed 6500 R.P.M.
LF611KlOOMF Single needle, MEDIUM sewing capacity machine with low inertia
presser foot, permitting 1ight presser foot pressure for positive
feeding
and chaining at high speeds - for long seams on light to
medium weight fabrics such as in trousers, skirts, coats, jackets,
etc. Standard recommended needle Type 128 GBS, Size 90/036. Stitch
range 7-10 S.P.I. Maximum recommended speed 6500 R.P.M., depending
on operation.
LF611K100MG Single needle, MEDIUM sewing capacity machine used for side and
inseaming men's work and dress pants made from medium weight
material. Standard
recommended needle Type 128 GBS, Size 90/036.
Stitch
range 10-14 S.P.I. Maximum recommended speed 6500 R.P.M.,
depending on operation.
LF611KlOOMR Same as Style LF611KlOOMF except - fitted with feeding presser foot
with yielding section to
left, allowing crossing of seams and
pockets.
LF611KlOOMW Same as Style LF611KlOOMF except - used for seaming cotton, flannel
and leather palm gloves. Standard recommended needle Type 128 GAS,
Size 110/044. Stitch range 5-14 S.P.I.
LF611KlOOMAW Same as Style LF611K100MF except -equipped with narrow feeding
presser foot
and related sewing parts for 3/16 inch (4.8mm) margin.
LF611K112MF Same as Style LF611K100MF except -equipped with Power "AIR-KLIPP ®"
chain
cutter.
LF611K112MG Same as Style LF611K100MG except -equipped with Power "AIR-KLIPP"
chain cutter.
® "AIR-KLIPP" is a registered trademark of Union Special Corporation.
3

From the library of: Superior Sewing Machine & Supply LLC
SAFETY RULES
A
CAUTION!
THIS SYMBOL INDICATES YOUR PERSONAL SAFETY IS INVOLVED
TO PREVENT PERSONAL INJURY:
- All power sources to the machine MUST be TURNED OFF before threading, oiling,
adjusting or replacing parts.
- Wear safety glasses.
-
All shields and guards MUST be in position before operating machine.
- DO NOT tamper with safety shields, guards, etc., while machine is in operation.
LUBRICATION
IMPORTANT: Machine must be in a leveled position.
Oil has been drained from main reservoir before shipment. Use a straight mineral
oil with a Saybolt viscosity of
90 to 125 seconds at 100 degrees Fahrenheit. This
is equivalent to UNION SPECIAL Specification No. 175. Remove oil filler cap (A,
Fig. 1) and fill to the TOP line of oil level gauge (B). Replace oil filler cap.
CAUTION! On new machines, machines that have been out of service for an extended
period of
time OR machines that have been drained of oil and
refilled ....•• RUN MACHINE SLOWLY at 300 R.P.M. for approximately five
minutes while paying
strict attention to the oil flow indicator which
should rise in the oil filler cap (A) and remain steady while machine is
running. This must be noted to ensure that oil flow indicator is
functioning and oil is circulating. Check oil level while machine is
running which MUST be maintained between the red lines of oil level gauge.
To maintain maximum recommended speed and serviceability of these machines, refer
to General Preventive Maintenance Schedule. Under no circumstances, should oil
remain in the machine for more than one year. Oil drain plug is located in bottom
of oil pan. ALWAYS change oil filter when oil is changed. At this time, evaluate
the contaminated condition of the
oil to determine if the oil filter should be
changed more or less frequently. To replace filter, remove four screws (C, Fig. 1)
and cover (D); lift out filter cartridge. REMOVE (brass) BY-PASS VALVE FROM TOP OF
OLD FILTER AND INSTALL IN NEW FILTER. Reassemble in reverse manner.
4

From the library of: Superior Sewing Machine & Supply LLC
PtOO
LUBRICATION DIAGRAM
..__ __. PRESSURE OIL
- SIPHON RETURN
Fig. 1
5
FILTER BY-PASS

From the library of: Superior Sewing Machine & Supply LLC
PIVOT GUARD
TO LEFT FOR
THREADING
A1 0 0A
THREADING DIAGRAM
6
0
(/)

From the library of: Superior Sewing Machine & Supply LLC
NEEDLES
Each needle has both a type and size number. Type number denotes the kind of
shank, point, length, groove, finish and other details. Size number, stamped on
the needle shank in metric, denotes largest diameter of blade, measured midway
between shank and eye. Collectively, type and size number represent the complete
symbol, which is given on the label of all needles packaged and sold by UNION
SPECIAL CORPORATION.
The type numbers of the needles recommended for each Style of machine covered by
this catalog are given in the machine style description. Other needles are
available, but the
ones indicated are those recommended to produce the most
satisfactory results. The type numbers of the recommended needles together with
their descriptions, and the sizes available are listed below:
NEEDLE TYPE
128 GAS
128 GBS
DESCRIPTION
Round shank, round point,
short, double groove, struck
groove, ball eye, spotted,
chromium plated.
Round shank, round point,
short, double groove, struck
groove, ball eye, spotted,
ball point,
chromium plated.
SIZES AVAILABLE
80/032, 90/036,
100/040, 110/044,
125/049, 140/054,
150/060, 170/067.
80/032, 90/036,
100/040, 110/044,
125/049, 140/054,
150/060.
To have needle orders promptly and accurately filled, an empty package, a sample
needle, or the type and size number should be forwarded. Use description on
label. A complete order would read
11
1000 needles, Type 128 GBS, Size 90/036
11
•
THREAD MACHINE AS ILLUSTRATED.
7

From the library of: Superior Sewing Machine & Supply LLC
Fig. 2
Fig. 3
Fig. 4
TIMING FEED TO NEEDLE
Adjustment would be required if the machine
is feeding while the needle is in the work.
This can be accomplished by removing top
cover,
head cover, left cloth plate and top
feed
chamber cover. Rotate handwheel in
operating direction to position needle bar
at
bottom of stroke. At this time, the first
screw (A, Fig. 2) in the feed drive eccentric
(B) must be on the flat of the feed drive
shaft
and in a vertical position. Adjustment
can be made by loosening two screws (A, Fig.
3) in upper mainshaft sprocket (B). Hold the
handwheel firmly with needle bar at bottom of
stroke
and rotate pulley as required to
position screw (A, Fig. 2) so it is
verti ca 1. Tighten screws (A, Fig. 3)
securely.
SYNCHRONIZING LOOPER AND NEEDLE MOTIONS
NOTE: End cover has been removed for clarity
in Figure 4, but MUST BE IN POSITION
WHILE MAKING THE FOLLOWING ADJUSTMENTS.
Looper drive belt, (A, Fig. 4) has proper
tension
if, when turning handwheel in
operating direction to position looper in the
center
of its (ri9ht to left) travel •••there
is no noticeable (right to left) play in the
looper
mechanism. There should be
approximately 1/8 inch (3.211111) deflection in
looper drive
belt when pressing firmly with
thumb, midway between sprockets (B and C).
Adjustment can be made by loosening two
screws (A, Fig. 5) and turn looper module (D,
Fig. 4) counterclockwise to tighten belt or
clockwise to loosen, as
viewed in Figure 4.
Retighten screws (A, Fig. 5).
To synchronize machine, remove needle bar
eyelet guard, needle thread take-up
cam,
needle, presser foot, throat plate, looper
and feed dog. Turn handwheel to position
needle bar
at BOTTOM of stroke and 1ooper
holder
at EXTREME right end of travel.
8

From the library of: Superior Sewing Machine & Supply LLC
SYCHRONIZING LOOPER AND NEEDLE MOTIONS
(Continued)
Using gauge No. 21227 R, mount gauge pl ate
with
throat pl ate attaching screws. Insert
pin (included with gauge) into looper
holder.
Mount indicator block to machine
head with one of the screws removed from
needle bar eyelet guard. Insert shank of
indicator
gauge into indicator block and
tighten screw against shank. (See sketch A
for reference).
Rotate
handwheel in OPERATING direction until
the pin in looper holder contacts
gauge
plate. Loosen screw (A, Fig. 6) in needle
bar connection
(B) and position needle bar
(C) as required to set the pointer of
indicator
gauge at "O" and tighten screw (A)
VERY LIGHTLY.
NOTE: This screw is specifically tightened
to
ONLY 10 in-lbs (11.5 cm/kg).
Rotate
handwheel in REVERSE direction until
pin in looper holder again
makes contact with
gauge plate and note the reading on the
gauge. A variation of
(1) graduation on the
scale
is permissible. If the reading is
above "O", loosen screws (E, Fi9. 4) and turn
rear looper drive sprocket
(B) towards the
operator (clockwise as
viewed in Figure 4).
If the reading is below "O", turn sprocket
away from operator (counterclockwise as
viewed in Figure 4). Temporarily snug screws.
Rotate
handwheel in OPERATING direction until
pin in looper holder contacts
gauge plate and
note the reading on scale. If the reading is
above "O", loosen screws (E) and turn
sprocket
(B) away from operator
(counterclockwise as
viewed in Figure 4). If
the reading is below "O", turn sprocket
towards the operator (clockwise as
viewed in
Figure 4). Temporarily
snug screws.
Continue
OPERATING
pointer of
graduation
handwheel
tightening
have .002
sprocket
connecting
to
check and adjust in both
and REVERSE directions until
indicator
gauge comes within (1)
on the scale when turning the
in
either direction. Before
screws
(E) securely, be sure to
inch
(.051mm) clearance between
(B) and needle guard drive
rod (F).
9
Fig. 5
- ---- i' -- -~ --
-~-- -
Fig. 6

From the library of: Superior Sewing Machine & Supply LLC
SYNCHRONIZING LOOPER AND NEEDLE MOTIONS (Continued)
LOOPER BEHIND
NEEDLE LOOPER IN
FRONT OF
N
EE DL E
l_ ~ ~
GR lf,E A ij T,_ES.:T=-_-ljtr,,---=:===: __
LEAST
-----l
A 1 07
SKETCH B
OPERATING
DIRECTION
If a synchronizing gauge is not
available •••. turn the handwheel in operating
direction to position looper point even with
the left side of needle and check the
distance from the eye of needle to the bottom
of looper blade. Turn handwheel in reverse
direction to position looper point even with
LOOPER
BEHIND
NEEDLE
LOOPER IN
FRONT OF
NEEDLE
the left side of needle and check the
distance from the eye of needle to the bottom
of looper blade. If the distance was greater
when handwhee l was turned in operating
direction, (as viewed in sketch B) loosen
screws (E, Fig. 4)
and turn rear looper drive
sprocket . (B) away from operator
(counterclockwise as viewed in Figure 4).
l _171lr'====~....__
GREATEST
1r-----1
REVERSE
DIRECTION
A109
For Proper SYNCHRONIZATION of
Looper & Needle
these two Dimensions will be the same
Looper
BEHIND
Needle
in
OPERATING
Direction
SKETCH D
Looper in
FRONT
of
Needle
in
REVERSE
Direction
A1011
SKETCH C
If the distance was greater when handwheel
was turned in reverse direction, (as viewed
in sketch C) turn sprocket towards the
operator (clockwise as viewed in Figure 4).
Temporarily snug screws. Continue to check
and adjust in both OPERATING and REVERSE
directions until the distance from the eye of
the needle to the bottom of looper blade is
the same in either direction (as viewed in
sketch D). Before tightening screws (E, Fig.
4)
securely, be sure to have .002 inch
(
.OSlmm) clearance between sprocket (B) and
needle guard drive connecting rod (F).
Fig. 7
10

From the library of: Superior Sewing Machine & Supply LLC
LOOPER SETTINGS
Insert a new needle, type and size specified. With looper positioned at EXTREME
right end of travel, distance from centerline of needle to point of looper should
be 5/32 inch (4.0nun). Adjustment can be made by loosening screw (A, Fig. 7) and
turn screw (B) clockwise to increase looper gauge or counterclockwise to decrease.
Apply pressure to the upper portion of looper holder (C) to the left while making
this adjustment and locking with screw (A). Looper gauge No. 21225-5/32 can be
used advantageously while making this adjustment. Looper must also be set so, as
it travels to the left behind the needle, NOT to touch, but
with a
MAXIMUM clearance of .005 inch
(.127mm). Adjustment can be made by
loosening screw (A) and moving looper holder
(C) forward or rearward on its shaft to
obtain specified conditions; apply pressure 1/64 Inch
to the upper portion of looper holder to the (.4mm)
left while tightening screw (A).
NEEDLE BAR HEIGHT
Turn handwheel in operating direction until
POINT of looper (A, Fig. 8) is even with the
LEFT side of the needle (B). TOP of needle
eye should be 1/64 inch (.4mm) below
Fig. 8
the undersurface of looper blade, as
shown in Figure 8. Adjustment can be made by
loosening screw (A, Fig. 9) and move needle bar (B) up or down as required; TORQUE
screw (A) to 10 in-lbs (11.5 cm/kg).
NOTE: Needle bar has a special coating. DO NOT wedge with any type of tool, as
damage to same may result.
LOOPER AVOID
Machine is equipped with a quick adjustable
looper avoid
mechanism to accomodate extreme
differences in needle
sizes. If looper avoid
requires
re-setting, loosen two screws (D,
Fig. 7) and turn eccentric stud (E) towards
the plus side (counterclockwise) for
MORE
looper avoid or towards the minus side
(clockwise)
for LESS looper avoid. When
desired setting is acquired, tighten screws
(D).
NOTE: Whenever looper avoid is changed,
always recheck "LOOPER SETTINGS".
11
Fig. 9
Torque to
10 In-Iba
.,~ 11,5 cm/kg)

From the library of: Superior Sewing Machine & Supply LLC
Fig. 10
Fig. 11
Fig. 12
REAR NEEDLE GUARD TIMING AND ADJUSTMENT
Rotate handwheel in operating direction to
position looper point at the RIGHT hand side
of needle. At this time the needle guard (A,
Fig. 10) should be at its EXTREME END of
FORWARD travel. Adjustment can be made by
loosening two screws (A, Fig. 11) and turn
needle guard eccentric (B) slightly as
required
until this condition exists. Ensure
.002 inch (
.051mm) clearance between needle
9uard
eccentric (B) and looper drive sprocket
(C) while tightening screws (A) securely.
Needle guard should also be positioned (left
to right) so the needle centers in the width
of the guarding surface. Adjustment can be
made by loosening collar screw (D) and pivot
link screw (E) permitting guarding surface to
be centered to needle. Position collar
against needle guard shaft bushing and
tighten screw (D) securely. Rotate guard as
required
to obtain •002-. 004 inch
(.051-.102mm)
clearance between guarding
surface and needle. Take up thrust by
exerting pressure against collar to the left
and pivot link to the right and tighten pivot
link screw (E) securely. Guard should be set
as low as possible yet have its vertical face
approach approximately 3/64 inch
(1.2mm) of
needle point. Adjustment can be made by
loosening two screws (B, Fig. 10) to position
9uard to proper height and reti ghten screws
(B) securely being sure to keep the width of
its guarding surface centered to needle.
NOTE:
12
Change
require
setting,
may.
in stitch length WILL NOT
change in needle guard
but a change
of needle SIZE
Fig. 13

From the library of: Superior Sewing Machine & Supply LLC
FEED DOG SETTINGS
Feed dog should be centered in throat plate with equal clearance on both sides and
ends. At highest point of travel, feed dog teeth should extend the depth of a full
tooth, or approximately 3/64 inch (1.2mm) above throat plate. MINOR (right to
left) adjustments can be made by loosening two screws {A, Fig. 12) in throat plate
support (B).
Loosen two screws (C) securing two locating ferrules which allow
movement to align throat plate support.
Reposition
slightly as required, considering
both needle hole
slot and feed dog slots.
Tighten screws (C) first, then screws {A).
Front to rear adjustment can be made by
turning stitch regulating knob {A, Fig. 13)
counterclockwise to obtain LONGEST stitch
length. Remove rear feed chamber cover which
is secured with four screws.
Loosen Allen screw {A, Fig. 14) and turn
eccentric
{B) while rotating handwheel in
operating
direction to obtain equal clearance
in
throat plate, front and rear. Tighten
screw
{A) securely.
Feed dog can be leveled or tilted by
loosening screw {A, Fig. 15) and rotate feed Fig. 14
rocker tilting shaft {A, Fig. 16) slightly as
required.
Check parallelism of feed dog by
placing throat plate in position. Before
tightening screw
{A, Fig. 15), make sure to
have approximately .002 inch {.051mm)
clearance between feed rocker {B) and spacer
sleeve
{C).
IMPORTANT: Recheck front to rear clearance
of feed dog in throat plate slots whenever
feed rocker tilting shaft has been
repositioned. Replace rear feed chamber
cover.
With feed travel set to desired stitch
length, set feed dog height as specified by
loosening mounting screw {A, Fig. 17) to
position as required. Feed dog supporting
screw
is located in the feed dog holder, Fig. 15
adjust as required to support feed dog before
tightening screw
{A).
A117
Fig. 16
Fig. 17
13

From the library of: Superior Sewing Machine & Supply LLC
1/32 inch
(.8mm)
Fig. 18
Fig. 19
Fig. 20
CHANGING STITCH LENGTH
Stitch length is changed by turning stitch
regulating knob (A, Fig. 18) clockwise to
shorten the stitch or counterclockwise to
lengthen
same. Recheck front to rear
clearance under "FEED DOG SETTINGS" whenever
stitch length is changed. Stop collar at
rear of machine attached to stitch regulating
knob shaft can be set to prevent stitch
length regulating knob (A) from accidentally
being turned
beyond the desired stitch length.
PRESSER BAR AND PRESSER FOOT
(For Styles LF611KlOOHM,
lOOMG, lOOMW and 112MG)
With needle bar at bottom of stroke and
presser foot resting squarely on throat
plate, there should be minimum clearance of
1/64 inch (0.4mm) between the bottom of screw
(A, Fig. 19) and bottom of slot in presser
bar guide
plate (B). There should also be
1/16 inch (1.6mm) clearance between bottom of
slot in lifter lever link (C) and bottom of
presser bar guide (D) when foot lifter lever
is released. If adjustment is required,
proceed as follows:
Back off presser bar spring regulator to
release tension on spring. Loosen two screws
(E) in presser bar guide (D). Loosen nut (F)
and turn screw (A) down against guide plate
(B) to obtain at least 5/64 inch (2.0mm)
clearance between bottom of presser bar guide
(D) and guide plate (B). Align presser foot
with needle
and press down FIRMLY while
tightening
two screws (E) in presser bar
guide (D).
NOTE: This setting was necessary to prevent
damage to the scraper edge of presser
bar bushing, should presser foot
be
removed from machine. Turn presser
bar spring regulator
down. Back off
screw (A) to obtain the 1/64 inch
(0.4mm) dimension between bottom of
screw and bottom of slot in presser
bar guide
plate (B), lock nut (F).
14

From the library of: Superior Sewing Machine & Supply LLC
PRESSER BAR AND PRESSER FOOT (Continued)
(For Styles
LF611KlOOHM, lOOMG, lOOMW and 112MG)
Loosen screw (G) in lifter arm (H) and rotate arm sli~htly as required to obtain
the 1/16 inch
(1.6mm) dimension between link (C) and gu1de {D), retighten screw (G)
ensuring no left to right shake in lifter arm (H).
Adjust presser bar spring regulator
so it exerts only enough pressure on presser
foot to feed the
work uniformly. Turning it clockwise increases the pressure,
counterclockwise acts the reverse.
PRESSER BAR AND PRESSER FOOT
(For Styles LF611KlOOMFand LF611Kl12MF)
With needle bar at bottom of stroke and presser foot resting on throat plate, there
should
be 1/32 inch (.8mm) clearance between top of screw and top of slot in
presser foot as
shown in Figure 19. There should be 1/16 inch (1.6mm) clearance
between bottom of slot in lifter lever link (C) and bottom of presser bar guide (D)
when foot lifter lever is released. If adjustment is required, proceed as
follows:
Loosen nut (F) and turn screw (A) down approximately 1/8 inch (3.2mm)
below bottom surface of presser bar guide (D). Back off presser spring regulating
screw and loosen screws (E) in presser bar 9uide (D) so that presser foot is
sitting squarely on throat plate and screw (A) is touching the bottom of the
presser bar guide
plate, then secure screws (E).
Turn presser spring regulating screw a 11 the way down, then back off screw (A)
counterclockwise to obtain the 1/32 inch (.8mm) dimension in presser foot, lock nut
(F).
Loosen screw (G) in lifter arm (H) and rotate arm slightly as required to
obtain the 1/16 inch
(1.6mm) dimension between link (C) and guide (D), retighten
screw (G). Make sure that there is no shake, left to right, in lifter arm (H).
FEEDING PRESSER FOOT
(For Styles LF611KlOOMR and LF611KlOOMAW)
With presser foot resting on throat plate and the needle in its lowest position,
the distance
from top of spring (A, Fig. 20) to top of yoke (B) should be 5/8 inch
(15.9mm) and the line stamped across the presser foot bottom should line up with
centerline
of needle.
As the presser foot is raised, its bottom should move VERY SLIGHTLY towards the
rear .•. 1/64 inch (.4mm) maximum. If adjustment is required, proceed as follows:
Remove presser spring regulating screw, presser bar spring guide and presser bar
spring.
Loosen nut (F, Fig. 19) and turn screw (A) down approximately 1/8 inch
(3.2mm) below bottom surface of presser bar guide (D). Loosen screws (E) in
presser bar guide
(D). Adjust spring regulator nut (C, Fig. 20) as required so its
lower surface is 5/8 inch (15.9mm) from top of yoke (B) as viewed in Fig. 20. With
presser foot resting on throat plate and feed dog down below throat plate, press
down on spring regulator nut (C) until the marks in presser foot bottom align with
centerline of needle
and positioned to keep needle in center of needle slot.
Tighten screws (E, Fig. 19) securing presser bar guide to presser bar, ensuring
stop
screw (A) in presser bar guide is resting on bottom of presser bar guide
plate. Replace presser bar spring, presser bar spring guide and presser spring
regulating screw.
Turn regulating screw down until the top of its threaded portion
is level with head casting. Rotate handwheel to position feed below throat plate
with presser foot resting
on throat plate. Depress presser foot lifter lever to
see
if presser foot bottom moves SLIGHTLY towards the rear before presser foot
begins to
lift.
15

From the library of: Superior Sewing Machine & Supply LLC
FEEDING PRESSER FOOT (Continued)
(For Styles
LF611KlOOMR and LF611KlOOMAW)
Adjustment can be made by turning stop screw (D, Fig. 20) clockwise to shorten or
counterclockwise to lengthen the distance
of travel.
Loosen screw (G, Fig. 19) in lifter arm (H) and rotate arm slightly as required to
obtain 1/16 inch
(l.61T111) clearance between link (C) and guide (D); retighten screw
(G), assuring
all end play is removed from lifter arm (H).
Presser
foot, at back of needle slot should cover most of throat plate land when
resting directly on throat plate.
When the presser foot bottom is raised by materia1 and the feeding foot spring
bottoms,
rear of needle slot should clear the needle. Main presser bar should not
begin to
lift before the spring of feeding foot bottoms.
Purpose of the feeding presser foot
is to make top and bottom plies of material
feed the
same amount without pulling on the bottom ply. Final adjustment may be
required to match plies; turning nut (C, Fig. 20) to increase pressure on spring
(A) wi 11 tend to feed the bottom ply more •.• decreasing pressure wi 11 tend to feed
the top ply
more.
Fig. 21
Fig. 22
LOOPER THREAD TAKE-UP AND CAST-OFF PLATE
looper thread take-up (A, Fig. 21) must be
centered, front to back in cast-off plate
(B). It should also be positioned so as the
needle bar
is descending, the looper thread
is "cast-off" the highest lobe of looper
thread take-up
when the point of the needle
is even with the bottom of looper blade.
If adjustment is required, lift cast-off
plate up. Loosen screw (A, Fig. 22) in
positioning
collar (B) and two screws (C) in
looper thread take-up.
Advance or retard
take-up as required. Tighten
two screws (C)
securely in take-up making sure it is
centered in cast-off plate. Positioning
collar (B), which has a slot in its face,
must be aligned with two screws which secure
the discs
of take-up together while THRUSTING
positioning collar forward against take-up.
Remove the play between screw heads in
take-up
and slot in positioning collar by
applying pressure on the collar CLOCKWISE
while tightening screw (A) securely.
Cast-off
plate (B, Fig. 21) should be
positioned with .004 inch (0.1mm) clearance
between cutting edge of looper thread
anti-wrap-up knife
(C) and hub (D) of looper
thread take-up,
which can be adjusted by
repositioning latch (E). Set adjustable
eyelets
(F) in the center of their mounting
screws. More or 1 ess, 1ooper thread can be
supp 1i ed in the stitch by moving adj us tab1e
eyelets to the
right or left respectively.
16

From the library of: Superior Sewing Machine & Supply LLC
LOOPER THREAD TAKE-UP AND CAST-OFF PLATE (Continued)
If retaining finger is rubbing take-up, loosen screw (G), center the finger (H) and
retighten screw. If retaining finger is on an angle, loosen screw (J), turn
retaining finger support
(K) slightly as required and retighten screw. The height
of retaining finger
can be adjusted by loosening screw (L), set to required height
and tighten screw securely.
THREAD TENSION RELEASE
Needle thread tension assembly (A, Fig. 23)
is set correctly when the tension discs (B)
start to release as the presser foot is
raised to within 1/8 inch (3.2mm) of the end
of its travel and completely released when
presser foot has reached its highest position.
Adjustment
can be made by removing plastic
plug (C) and loosening screw (D) and lower
the tension assembly (A) to advance the
release action or
raise tension assembly to
retard the release action.
Hold tension
assembly in position while retightening
screw
(D). Reassemble plastic plug securely.
THREAD CONTROL (PRELIMINARY SETTINGS)
Needle bar eyelet (A, Fig. 24) should be set
with its eyelets 1/16 inch (1.6mm) below
strike-off (B) on needle thread cam (C), as
shown in Figure 24, with needle bar at BOTTOM
of stroke.
Adjustments
can be made by bringing needle
bar up, loosen screw (D) slightly, bring
needle bar
down to BOTTOM of stroke,
reposition eyelet
(A) as required and bring
needle bar
back up. Torque screw (D) to 10
in-lbs (11.5 cm/kg).
Fig.
23
Fig. 24
A
1/ 16"
(1.6mm)
Needle thread cam (C) should be set to barely contact needle thread with needle bar
at top of stroke. Adjustment can be made by loosening needle thread cam attaching
screw (E), reposition cam forward or rearward as required and retighten screw(£).
17

From the library of: Superior Sewing Machine & Supply LLC
THREAD CONTROL (PRELIMINARY SETTINGS) (Continued)
1 7/8 inch
( 4 7 .6 mm) - ~ ... 1-----.....J
STANDARD
EYELET
POSITION
EYELET
POSITION FOR
••" ~ LOOSE STITCH
As a starting point, the needle thread (adjustable) eyelet should be set 1 7/8 inch
(47.611111) from its right side to the right side of the thread control plate eyelet
and 1 5/16 inch (33.3mm) from centerline of its eyelet to the top of the top cover,
as
illustrated above.
Tension on needle thread should be just enough to pull up uniform stitches.
Tension on looper thread should be just enough to steady thread.
t
; .___ __,. .......,,......,.. .,...... __ __
'\ A 1 28
Fig. 25
POWER "AIR-KLIPP" CHAIN CUTTER ADJUSTMENTS
Upper knife (A, Fig. 25) can be replaced by
removing two screws (B). To replace lower
knife, the
upper knife must be removed and
rear suction tube cover. Loosen two screws
(C) and slide housing (D) towards the rear.
Remove screw (A, Fig. 26) and lift up thread
inlet (B). Unhook knife spring (E, Fig. 25)
and remove lower knife (F). Reassemble
knives in reverse manner. Reassemble thread
inlet (B, Fig. 26) and slide housing (D, Fig.
25) forward against rear of throat plate;
tighten two screws (C).
SETTING KNIFE CROSS OVER
Adjustment may be necessary after replacing
or repairing knives.
With sewing motor
switch 1n "OFF" position and air lines
connected to air motor, depress treadle until
air motor begins to operate, in and out.
18

From the library of: Superior Sewing Machine & Supply LLC
POWER
11
AIR-KLIPP
11
CHAIN CUTTER ADJUSTMENTS (Continued)
IMPORTANT: Be sure that lower knife does NOT strike against knife housing or feed
chamber cover. Adjustment should be accomplished by loosening two
screws (G, Fig. 25) and reposition air motor (H) left or right
slightly, but under extreme circumstances it may become necessary to
shorten the stroke of lower knife travel
by repositioning coupling (J).
Carefully press against lower knife (F, Fig.
25) until air motor stalls. With treadle
still depressed, check the knife cross over.
Cross over of lower knife to upper knife
is
positioned correct 1y when the 1 ower knife is
1/32 inch (.Bmm) from the front of upper
knife as
shown in Figure 25. If adjustment
is required, loosen screw (K) and reposition
coupling (J) as required to obtain specified
dimension.
SHEAR ANGLE
Shear angle should be .003 inch (.076mm),
measured at rear cutting edge of lower knife
(F, Fig.
25) and cutting ~dge of upper knife
(A). Adjustment
can be made by loosening nut
(A, Fig. 27) and turning screw (B) clockwise
to increase the angle or counterclockwise to
decrease.
Lock nut (A) after shear angle is
set.
SETTING PRESSURE VALVES
Regulate valve on pneumatic control device
for air motor of the
11
AIR-KLIPP
11
chain cutter
to approximately 20-22 p.s.i. (1.5 bar) when
air motor is operating. Regulate valve on
pneumatic control device for the suction air
to obtain maximum suction, yet so that the
FABRIC TO BE SEWN wi 11 not be cut by the
"AIR-KLIPP" chain cutter knives.
Fig.
27
19
A1 3 1
Fig. 26
-------=:::---:-~ 1/ 3 2"
(.8mm)
KNIFE CROSS OVER
.003" (.076mm)
SHEAR ANGLE
(]/)
PUSH
HERE
TO STALL
KNIFE

From the library of: Superior Sewing Machine & Supply LLC
GENERAL PREVENTIVE MAINTENANCE SCHEDULE
LF 600 AFTER EVERY
EVERY EVERY Yearly
TASK DAILY FIRST
MONTH
-3-
-6-
MONTH MONTHS
MONTHS
Check oil level
(sight gauge)oil
LF600
level between red
lines.
Check pump operation
(oil
flow indicator - LF600
top of arm)
Clean lint and dirt
from machine LF600
Check that all guards
and shields are in LF600
place and being used
Change oil-filter
(housed-on machine
LF600 LF600
bottom cover)
Change oil (oil
which conforms to
LF600
LF600
U.S.C. spec 175 must
be used)
Clean lint and dirt
from suction screen
LF600
(inside bottom cover)
Clean head oil
suction screen
LF600
Check tension on
internal timing belts LF600 LF600
Inspect clutch/
positioner motor,
V-belt, tension
and wear LF600
Check clutch motor
clutch/brake
adjustment
LF600
Clean lint from
clutch/positioner
motor air passages LF600 LF600
Check needle (S)
bent, blunt, sharp
or
worn eye or groove LF600
NOTE: SCHEDULING IS BASED ON NORMAL WORKING CONDITIONS FREQUENCY OF TASKS DEPENDS
ON MACHINE DUTY CYCLE TIME AND PERSONNEL RESPONSIBLE TO PERFORM TASK
DETERMINED BY PLANT MANAGEMENT.
20