Singer 221 (Featherweight) Service — Service manual — PDF Download

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Supplement to
 Form 21325
Machine 221
(566)





         SERVICE MANUAL
     SINGER

             MACHINE 221





                                - THE SINGER COMPANY

 *A Trademark of THE SINGER COMPANY                                                            Printed in U. S. A

            www.Singer-Featherweight.com

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DESCRIPTION

Lightweight portable lockstitch machine with The motor is mounted on machine bed. Wiring to
reversible drop feed and electric drive. motor and light is concealed in machine arm and
bed. The machine is equipped with a foot controller.
Graduated stitch length indicator. (Note: Machine 221K4 is also equipped with R. F.
Suppressors and grounded wiring.)
Numerically graduated thread tension device.
Light and light shade attached to front of ma-
Rotary hook on horizontal axis, makes two rev- chine arm with control switch located on bed. (Ma-
olutions per stitch. chine 221K4 has light switch built into the light
socket.)
Machine 221K7 is equipped with belt linkage be-
tween arm and hook shafts. Other varietiesare Machine base 10-7/64 inches long, 7-1/4 inches
equipped with an upright arm shaft and gears wide. Space at right of needle, 5 inches.

Hinged bed extension. Presser bar light: 5/16 inch. Feed dog height:
.040 inch above throat plate.
Manually controlled bobbin winder attached to
belt guard. Maximum stitch length: 6 stitches per inch.

Needle, Cat. 2020 (15×1), threaded from right Speed range: 900 to 1400 г. p. m.
to left.

PRINCIPAL PARTS AND FEATURES

PRESSURE REGULATOR THREAD TENSION LIGHT SPOOL PIN ARM TOP COVER

TAKE-UP LEVER - HAND WHEEL

FACE PLATE. BOBBIN WINDER

STITCH LENGTH
PRESSER FOOT LEVER SINGER REGULATOR

THREAD CUTTER MOTOR BELT

LIGHT SWITCH

PRESSER FOOT

THROAT PLATE - BOBBIN-WINDING
THREAD GUIDE

BED EXTENSION 221-1- SERIES 3
221K4. CAK7
MOTOR
221K5- CAJ6-8
FEED DOG 221K7: CAK8-8 ELECTRICAL CONTROLLER

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PREPARATION FOR INSPECTION

Before inspection to find causes of faulty opera- CAUTION: KEEP VARSOL AWAY FROM ALL
tion, the machine should be thoroughly cleaned RUBBER PARTS.
and lubricated.
Note: Under extreme conditions (if grease and
Remove face plate and throat plate. Open arm dirt is hard and tacky remove motor, light and
top cover and remove bottom cover. wiring, as instructed on page 25, and soak machine
in a tank of varsol until solids have become softened.
Remove lint and other foreign matter that may
have accumulated around the sewing area and clear CAUTION: Before dipping Machine 221K7 in
all exposed moving parts with a broom type nylon varsol, it will be necessary to remove the Arm Shaft
brush dipped in varsol. Connection Belt, as instructed on page 24.

LUBRICATION

Use SINGER* OIL and SINGER* LUBRICANT

With the face plate removed and arm top cover
removed or turned aside, apply a small amount of oil
or lubricant to each of the points indicated in Fig
3, 4 and 5. Close arm top cover and replace face
plate. otherw

Fig. 4. LubricationI of Hook

OIL OIL LUBRICANT
(Gear Driver
Machine Only

• OIL

"OIL

OIL

Fig. 3. Lubrication - Inside Face Plate Fig. 5. Lubrication - Rear and Top

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Turn machine on its side, remove bottom cover       dicated in Fig. 6. Replace bottom cover.
 and apply oil or lubricant to each of the points in-

                      OIL    OIL            LUBRICANT              OlI
       OIL                                                   (Gear-Driver
                                                         Machine Only)





    BITTED





  OIL





  OIL





                 OIL                                          OIL





                                             MOTOR
                                                     LUBRICANT
TO LUBRICATE THE MOTORoer-

  Never use of orC ordinary gear grease to lubricate
 motor. Entrance of ojl into motor may cause failure
 of electrical components. Use MOTOR LUBRICANT
 sold by The Singer Company.

   The fwo motor grease tubes, Fig. 7, should be
refilled every 6 to 12 months, depending on machine
 usage.





                                                                                Fig. 7. Lubrication - Motor

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TO SET THE PRESSER FOOT HEIGHT

GUIDE BRACKET
SET SCREW

5/16 INCH

SHOULD BE
ALIGNED

Fig. 8. Setting Presser Foot Height Floud, Aligning Presser Foot

CHECK: SETTING:

When presser foot is raised to highest point, dis- Loosen, guide bracket set screw shown in Fig. 8
tance between bottom of presser foot and top surface and raise or lower presser bar as required to obtain
of throat plate should be 5/16 inch, as shown in Fig. correct height.
8. (Note: The needle clamp, when at its lowest point;
should not strike the raised presser foot.) Align presser foot with throat plate slots and 0
needle as shown in Fig. 9.
Presser foot should be in alignment with throat
plate slots and feed dog, as shown in Fig. 9. Inset, Securely tighten guide bracket set screw.
Fig. 9, shows correct alignment of presser foot with
needle

TO SET THE FEED DOG HEIGHT

PREPARATION:Singe

1. Remove bottom cover.

2. Set stitch length regulator for 12 to 15 stitches

per inch.

3. Turn hand wheel toward operator until feed dog

is in its highest position.

Fig. 10. Preparation - Feed Dog Height

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CHECK: STRAIGHT EDGE THROAT PLATE

With feed dog at highest point, approximately the
full depth of rear teeth should project above top
surface of throat plat

SETTING: DANAAAAAAAAN

Loosen hinge nut on FEED LIFTING ROCK
FULL DEPTH OF REAR TOOTH
SHAFT, Fig. 12, and turn eccentric hinge screw
until high point of eccentric is toward rotary hook FEED DOG
shaft. Then turn eccentric hinge screw as required to
correct height.
Fig. 11. Feed Dog at Correct Height
Maintain this setting while tightening hinge nut.

TO POSITION FEED DOG
IN THROAT PLATE SLOTS

LENGTHWISE SETTING

PREPARATION: SETTING:

Set feed dog height as previously instructed. Logsen hinge nut on FEED ROCK SHAFT, Fig.
and turn eccentric hinge screw until high point
CHECK: of eccentric is away from rotary hook shaft. Then
furn eccentric screw as required to bring teed doc
Feed dog should move as close as possible to in correct position.
front of throat plate slots without striking throaf
plate. Maintain this setting while tightening hinge nut.

FEED ROCK SHAFT

ECCENTRIC HINGE
SCREW

ROTARY HOOK SHA NUT

FEED LIFTING NUT
ROCK SHAFT

- ECCENTRIC HINGE
SCREV

Fig. 12. Setting Height of Feed Dog and Positioning Lengthwise in Throat Plate Slots

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TO POSITION FEED DOG (Cont'd)



        CENTER                 FEED ROCK SHAFT                       CENTER
          SET SCREW                                                              SET SCREW





           CENTER                                                        CENTER
            SET SCREW                                                              SET SCREW





                                      FEED LIFTING
                                        ROCK SHAFT





                                Fig. 13. Positioning Feed Dog Sidewise in Throat Plate





                                      SIDEWISE SETTING:


 PREPARATION:                                         centers in place. To move feed dog toward the left,
                                                          gently tap the right hand center of the feed rock
   Set feed dog heighy as previously instructed.         shaft and feed lifting rock shaft to the left until feed   noe                                                        dog is correctly positioned. Then tighten the four
CHECK:                                                  set screws. To move feed dog toward the right, gently
                                                            tap the left hand centers to the right until teed doc

    Feed dog should be centrally located between         is correctly positioned.

the sides of the feed slots of the throat plate
                                                      NOTE: Check for end play or binding in feed rock
SETTING:                                                  shaft and feed lifting rock shaft. To adjust, loosen
                                                        center set screw at right end of machine and move
   Loosen the four center set screws, Fig. 13, hold-        center as required.

 ing the feed rock shaft and feed lifting rock shaft

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TO SET NEEDLE BAR HEIGHT

USING TIMING MARK

CHECK: BUSHING
SET SCREW
Turn hand wheel over toward operator until needle
bar is at its lowest point. At this position, upper
timing mark, Fig. 14, should be just visible at lower
edge of needle bar bushing.
NEEDLE
SETTING: BAR BUSHING

Loosen clamp screw, Fig. 14, and raise or lower
needle bar as reauired. Make certain needle bar is UPPER
correctly turned with long groove in needle facing TIMING
toward right of machine. Then tighten clamp screw. MARK

WITHOUT USING TIMING MARK

If there is any belief that the needle bar bushing
has been disturbed, it will be impossible to set the
needle bar by use of the timing marks.
CLAMP twosSCREW
CHECK:

Remove bobbin case and bobbin. With needle X
threaded, hold thread end and turn hand wheel over Fig. 14. Setting Needle Bar Height
toward operator until needle reaches its lowest point
and rises approximately 1/10 inch. At this point the
needle thread loop should be fully formed, Fig. 15,
and ready for entrance of hook point directly above APPROX. 1/10*
needle eye. UPWARD
STROKE
SETTING:

Loosen clamp screw, Fig. 14k and raise or lower
needle bar as required. Make certain long groove of
needle is facing toward right of machine and tighten
clamp screw. Then set the needle bar bushing.

THREAD • HOOK TO SET NEEDLE BAR BUSHING
LOOP POINT
CHECK:

With needle bar set at correct height, turn hand
wheel over toward operator until needle bar is at its
lowest point. In this position the upper timing mark
on the needle bar should be at bottom edge of the
bushing.

SETTING: NEEDLE
EYE
Loosen needle bar bushing set screw, Fig. 14,
and raise or lower bushing as required. Then tighten
SET screw. Fig. 15. Needle Thread Loop Formed

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TO POSITION HOOK TO OR FROM NEEDLE

CHECK:

Remove throat plate and turn hand wheel over

toward operator until lower timing mark on needle
ноок bar is at lower edge of needle bar bushing on its
POINT
upward stroke. With needle bar in this position, the
distance between the side of needle and point of
NEEDLE hook, as shown in insert in Fig. 16, should be .005"
This is approximately the thickness of a piece of
ordinary note paper.
.005'
SETTING:
COUNTER-
ноОК BALANCE
SET
Loosen counterbalance set screw, Fig. 16, and SCREW
move counterbalance away from bushing. Loosen one
hook set screw. Turn balance wheel toward operator
to position needle bar as instructed above. Loosen
the other hook set screw and bushing set screw.
Using a 1/4" brass drift pin, gently tap bushing to
• SET left or right as required. Press hook assembly against
BUSHING
SCREW bushing and tighten hook and bushing set screws. Re- SET SCREW
check setting and replace counterbalance with hub

against bushing.
Fig. 16. Distance Between Needle and Hook

TO TIMÉ THE HOOK

PREPARATION:

Set needle bar height and position of hook to or
from needle as previous y instructed

LOWER CHECK:
TIMING
MARK
With needle threaded, turn hand wheel over toward
operator until needle bar reaches lowest point and
rises to position where lower timing mark on needle
bar, Fig. 17, is just visible at lower edge of needle
bar bushing. With needle bar in this position, the
point of the hook should be approximately 1/16"
HOOK POINT above the needle eye and entering the needle thread
ENTERING UPWARD oop
THREAD LOOP STROKE

SETTING:

Remove bottom cover. Loosen rotating hook shaft
pulley set screws, Fig. 18, or hook shaft bevel gear
• NEEDLE EYE
set screws in gear driven machines. Turn shaft man- 1/16 INCH BE LOW
HOOK POINT vally until point of hook is in its correct position
to the needle eye and needle thread loop, as shown
Fig. 17. Timing Hook in Fig. 17. While holding hook in this position, tighten

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TO TIME THE HOOK (Cont'd)

set screws in pulley or bevel gear.

CAUTION: In gear driven machines, do not disturb
mesh of bevel gears.
ROTATING
HOOK SHAFT

- SET
SCREWS

NEEDLE THREAD TENSION

TAKE•UP SPRING STROKE Fig. 18. Timing Hook

CHECK:

The take-up spring, Fig. 19, should complete its SET SCREW
action and be at rest against take-up spring stop SLACK
point of needle enters material THREAD
LATER REGULATOR
ACTION
SETTING:

EARLIER
To adjust the take-up spring stroke, loosen set TAKE-UP ACTION
screw, Fig. 19. Move slack thread regulator to the SPRING
right to complete take-up spring action earlier
(shorter stroke) or to the left to complete take-up

spring action later (longer stroke). Then securely D tighten set screw.
TAKE-UP
SPRING
STOP

TAKE-UP SPRING TENSION Fig. 19. Setting Take-up Spring Stroke

CHECK:

Tension on the take-up spring should be just

sufficient to take up the slack of needle thread until

point of needle enters material.
END OF
SETTING: TAKE-UF
SPRING
Turn tension dial fo zero, remove face plate and SET
loosen stud set screw, Fig. 20. Remove entire ten- SCREW
tion assembly from machine. Slide end of take-up
spring, Fig. 20, out from groove in tension stud.
Turn end of spring toward right (CLOCKWISE) to in-
DECREASE crease tension or toward left (COUNTERCLOCKWISE)
to decrease tension and place it in nearest groove.
Replace tension assembly, drawing take-up spring
INCREASE
up so it rests on take-up spring stop, Fig. 19, and securely tighten set screw.

Fig. 20. Setting Take-up Spring Tension

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TO ADJUST NEEDLE THREAD TENSION

CHECK:

With machine threaded, lower presser bar to en-
INCREASE gage tension and turn tension regulator dial to zerc
(0) position, Fig. 21. Hold thread on both sides of
tension regulator and pull back and forth through
DECREASE tension discs. The tension on the thread should be
just slightly perceptible, which gradually increases
with the turning of the regulator dial to the right.
THUMB
PIN NUT
SETTING:

If the pull on the thread is too strong for minimum
tension, press in numbered dial to disengage pin in
thumb nut, Fig. 21, from dial. Reset pin in next
DIAL hole to the left of previous setting. Repeat process
until there is ho tension on thread. Then advance
pin one hole to the right to produce minimum tensi

at zero (0) position.

Fig. 21. Adjusting Needle Thread Tension

TO ADJUST BOBBIN THREAD TENSION

INCREASE TENSION
CHECK:

DECREASE TENSION Remove threaded bobbin case and bobbin from
machine. Hold end of bobbin thread allowing the bob-

bin case and bobbin to hang free. When tension is
correctly adjusted, the bobbin case will descend
slowly each time the thread is given a slight "jerk"
upward. When using a tensiometer, a bobbin thread Feattension of approximately 50 grams is sufficient for
No. 50-3 mercerized cotton
Fig. 22. Adjusting Bobbin Thread, Tension

SETTING:

Gradually turn tension regulating screw for either
ADJUSTING PULLEY increased or decreased tension, as shown in rig. 22
SCREW

TO ADJUST BOBBIN WINDER PRESSURE

CHECK:

BELT The pressure of the bobbin winder pulleyagainst
the belt should be just enough to operate the bobbin
winder without slippage.

SETTING:

Tighten adjusting screw, Fig. 23, sufficiently to
Fig. 23. Adjusting Bobbin Winder increase pressure of pulley against belt.

12

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TO ELIMINATE END PLAY OR BINDING
OF HORIZONTAL ARM SHAFT

HAND WHEEL
BUSHING

Should the horizontal arm shaft require adjustment
for end play or binding, remove hand wheel as in-
structed on page 23 to expose hand wheel bushing.
Loosen set screws, Fig. 24, and move hand wheel
bushing slightly away from arm shaft bushing. Insert
a .003 feeler gauge between the two bushings, move
hand wheel bushing back against the feeler gauge SET
and tighten set screw. Replace hand wheel. SCREW
ARM SHAFT
BUSHINg

Fig. 24. Adjusting Arm Shaft End Play

TO ELIMINATE END PLAY OR BINDING
OF UPRIGHT ARM SHAFT
(GEAR DRIVEN MODELS)

SET
UPPER HORIZONTAL SCREWS
BEVEL GEAR.
Feat SET
SCREWS

Open top cover and remove bottom cover. Loosen
set screws, Fig. 25, in lower vertical bevel gear.
Press downward upon upright arm shaft. Set lower
vertical bevel gear firmly against lower bushing in - UPRIGHT
casting and securely fighten gear set screw. ARM
SHAFT

Check mesh of upper and lower vertical and hor-
LOWER
izontal bevel gears to ascertain that they are fully BUSHING
meshed. To adjust, loosen horizontal bevel gear set , SET
screws, Fig. 25, and slide gear to position where it SCREWS
is correctly meshed with vertical gear. Then tighten
set screws and replace covers.

CAUTION: Bevel gears must always be kept in LOWER
mesh at all times VERTICAL
GEAR LOWER HORIZON TAL
BEVEL GEAR

Fig. 25. Adjusting Upright Arm Shaft End Play

13

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TO ELIMINATE END PLAY OR BINDING
                            OF HOOK DRIVING SHAFT


     Binding may be caused by lack of lubrication       clearance between needle and hook, see page 10.
  or foreign material obstructing moving parts. Clean       Place counterbalance against bushing and tighten
  and lubricate as instructed on page 5.                        set screws. In gear-driven machines, it may be neces-
                                                       sary to loosen set screws in horizontal hook shaft
    To eliminate end play or binding in hook driving       bevel gear while making this adjustment. Then tight-
   shaft, loosen counterbalance set screw and bushing      en ser screws.
  set screw, Fig. 26. Position shaft as required to
 eliminate binding or end play and move bushing         Recheck clearance between needle and hook and
 against the hook, taking care to maintain correct       check the hook timing. See page 10.




      COUNTERBALANCE      SET          FEED ROCK SHAFT        CENTER
                         SCREW
                                                           SET
                                                                              SCREW





   BUSHING
   SET SCREW



                                                                                      'SET
                                                                      SCREW


           BUSHING              FEED LIFTING        HOOK           CENTER
                            ROCK SHAFT           SHAFT


                             Fig., 26. Eliminating End Play or Binding Beneoth Machine Bed





                        TO ELIMINATE END PLAY OR BINDING
                  OF FEED ROCK SHAFT AND FEED LIFTING ROCK SHAFT


   To eliminate end play or binding of feed rock       rock shaft, loosen set screw at right end of shaft,
  shaft, loosen set screw at right end of shaft, Fig.         Fig. 26, and adjust center shown as required.
 26, and adjust center shown so that shaft rides
snugly but freely, (without left or right movement).          Securely tighten set screw.

    Securely tighten set screw.                       Check position of feed dog and adjust is re-
                                                               quired. See page 6.
   To eliminate end play or binding of feed lifting

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REMOVALS AND REPLACEMENTS

NEEDLE BAR

BUSHING
REMOVAL:

1. Remove face plate.
2. Loosen set screw in needle clamo as shown in
Fig. 27 and remove clamp.
NEEDLE BAR
3. Loosen clamping screw, Fig. 27, and lift needle
bar up through bushing and out of machine. CLAMPING
SCREW
REPLACEMENT:

1. Insert needle bar down through bushing shown in
Fig. 27.
2. Replace needle clamp and tighten set screw.
3. Adjust needle bar height as instructed on page 9.
4. Make certain the needle bar is turned correctly, NEÉDLE SET SCREW
then tighten clamping screw. CLAMP
5. Replace face plate.

Fig. 27. Removing Needle Bar.

PRESSURE REGULATING
THUMB SCREW,
PRESSER BAR

REMOVAL:

1. Remove face plate.
2. Remove presser foot and thumb screw. EXTENSION PIN 3. Remove pressure regulating thumbFeatherscrew, exten- AND SPRING
sion pin and spring, as shown in Fig. 28.
4. Remove thread cutter (earlier machines only).
5. Loosen guide bracket sef screw, Fig. 28, and lift SET
presser bar up and ouT SCREW.

REPLACEMENT: BUSHING

1. Replace presser bar through guide bracket, Fig.
28, and bushing.
GUIDE
2. Replace extension pin, spring and regulating BRACKET
thumb screw.
3. Replace foof and thumb screw.
4. Set presser bar at correct height, see page 6,
and align foot with throat plate slots.
5, Tighten guide bracket set screw
6. Replace face plate. THUMB: PRESSER
SCREW FOOT

Fig. 28. Removing Presser Bar

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REMOVALS AND REPLACEMENTS

NEEDLE THREAD TENSION (Cont' d)

THREAD GUARD STUD TENSION SPRING

RELEASING
PIN

Stitutille

TAKE-UP.
SPRING
DISC ASSEMBLY INDICATOR STOP WASHER THUMB NUT

Fig. 31 Needle Thread Tension Assembly

REPLACEMENT: THREAD
GUARD

shown in Fig. 31.
2. Place tension discs, with convex sides together,
on thread guard as shown in Fig. 32..
3. Pass eyelet of take-up spring under thread guard,
keeping coils of spring above tension discs as
shown in Fig. 32.
4. Align coils of spring with hole in discs and place EYELET TENSION DISCS
this assembly on stud as shown in Fig. 33. Tail
of thread guard enters hole provided in machine Fig. 32. Tension Disc Assembly
head.
Note: Tail of spring, Fig. 33, enters one of the RELEASING STUD THREAD
grooves in rear of stud. (See instructions for PIN GUARD
setting take-up spring, page 11.)
5. Replace indicator, open side out, on stud with
plus and minus indications at top as shown in
Fig. 31.
6. Insert tension spring into indicator and replace

stop washer as shown in Fig. 31.
TAIL OF:
7. Place humbered dial on stud with numeral 2 op-
SPRING
posite stop washer extension. Press in dial to
compress spring. While holding in, replace thumb
nut, carefully guiding pin into one of the holes
in the dial. TAKE-UP TENSION
8. Replace entire tension assembly into machine and SPRING DISCS
tighten set screw.
9. Adjust tension as instructed on pages 11 and 12. Fig. 33. Take-up Spring Unit

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REMOVALS AND REPLACEMENTS

BOBBIN CASE BASE (LATEST STYLE)

REMOVAL: REPLACING:

1. Remove throat plate and bobbin case. 1. Replace bobbin case base in position as shown
2. Remove gib screw, Fig. 34, and displace gib as in Fig. 35. Rotate it slightly until if seats.
shown in Fig. 35. 2. Return gib to original position and replace screw.
3. Turn bobbin case base so smal point on bobbin 3. Replace throat plate, making certain that the posi-
case base is beneath point of sewing hook as tion finger is in notch of position plate under
shown in Fig. 35. throat plate.
4. Remove base by lifting upward and out.

CASE BOBBIN CASE BASE
BASE
GiB POINT
SCREW
POSITION' HOOK
FINGER POINT

Fig. 34. Removing Gib Screw Fig. 35. Removal of Bobbin Case Base

BOBBIN CASE BASE(OLD STYLE)

BASE

SPRING REMOVAL:

1. Remove throat plate, bobbin case and bottom
COver
2. Loosen two set screws in hub of hook, Fig. 37,
RETAINING and remove hook from hook shaft.
SCREW GIB 3. Remove retaining screw and spring, Fig. 37,
Fig. 36. Sewing Hook Disassembled from rear of hook.
4. Remove gib screw and gib, Fig. 38, from front of
hook.
HUB RETAINING 5. Lift bobbin case base from face of hook.
SCREW

REPLACEMENT:

SET. 'SPRING 1. Place base in its seat in,hook.
SCREWS
2. Replace aib and aib screw on front of hook as
Fig. 37. Rear View of Sewing Hook shown in Fig. 38.
3. Replace spring and retaining screw on rear of
hook as shown in Fig. 37.
4. Replace hook on hook shaft, position in relation
to needle and reset time as instructed on page 10.
'GIB
GIB' SCREW 5. Replace bottom cover and throat plate.

Fig. 38. Removal of Gib Screw and Gib

18

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REMOVALS AND REPLACEMENTS

                             ROTATING HOOK ASSEMBLY

REMOVAL:                                                  3. Adiust clearance between hook and needle, and
                                                               reset timing. (See page 10 for instructions.)
 1. Remove needle, throat plate and bobbin case.        4. Replace bottom cover, bobbin case and throat
2. Turn machine over on rear side and remove bottom         plate.
    cover.                                                            LOOSEN SCREWS
 3. Loosen two set screws, Fig. 39, in hub of hook
   assembly.
 4. Remove assembly from hook shaft.

REPLACEMENT:

                                                           REMOVE HOOK
 1. Replace assembly on hook shaft.
2. Replace needle.                                             Fig. 39. Removing Hook Assembly


                      ROTATING HOOK SHAFT (GEAR-DRIVEN MAcHINES)

  OLD                               NEW                          SET SCREWS
  SHAFT                                   SHAFT

                                                                             BUSHING

 BUSHING                                                                      THREE-PIN
                                                                                  TERMINAL


                                                                    *HOOK SHAFT
 COUNTERBALANCE                     FLATS                        BEVEL GEAR

                                               Fig. 40. Removing Hook Shaft


REMOV AL:                              REPLACEMENT:

1. Remove needle, throat plate, bobbincase and         1. Replace rotating hook on hook shaft being certain
  bottom cover.                                             that left end of shaft is flush with face of hook,
 2. Remove rotating hook assembly, as previously        when hub of hook is against shaft bushing. The
    instructed, and bobbin case base as instructed on           set screw in hub, nearest the hook point, should
   page 18.                                       engage flat of shaft. Tighten set screws in hub.
 3. Loosen counterbalance set screw and hook shaft         2. Check position marking on hook shaft bevel gear
   bevel gear set screws. (See Fig. 40.)                and tighten set screws while gear is against
   CAUTION: MARK RELATIVE POSITION OF            bushing at right end of shaft.
  MATED BEVEL GEARS to insure proper mesh        3. Hold counterbalance ágainst bushing and tighten
   on later assembly.                                              set screw against flat of shaft.
 4. Remove screw holding the three-pin terminal,        4. Reassemble the bobbin case base in the hook.
    Fig. 40, and carefully push aside the wiring to           (In machines using the old style hook, it will be
   expose right end of hook shaft.                          necessary to remove the hook from the shaft. See
 5. Using new shaft as a tool, push old shaft out          instructions on page 18.)
      through left end of machine. Make certain that the        5. Check for binding and end play, as instructed on
    inserted end of the new shaft presents the flats,        page 14.
   Fig. 40, on which the rotary hook set screw and        6: Replace needle and adjust clearance between
    counterbalance set screw, respectively, are to be        hook and needle and reset hook timing, as in-
    tightened.                                                   structed on page 10.
                                                                7. Replace three-pin terminal, bottom cover, bobbin
                                                        case and throat plate.


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REMOVALS AND REPLACEMENTS

ROTATING HOOK SHAFT (BELT DRIVEN MACHINES)

REMOVAL: REPLACEMENT:

Proceed as instructed for gear-driven machines Proceed as instructed for gear-driven machines
except as follows: except as follows:

1. Do not disturb wiring. 1. Insert new shaft from the left.
2. Loosen set screws in hook shaft pulley, Fig. 41, 2. Insert shaft through pulley and belt. Place pulley
counterbalance and hook assembly. Remove old against right end bushing and tighten set screws.
shatt out through left end of machine. Do not use
new shatt as a fool.

HOOK SHAFT PULLEY

SET SCREW

•SET SCREW

COUNTERBALANCE BELT

Fig. 41. Removing Hook Shaft

FEED REGULATOR

REMOVAL:
SPRING
WASHER
1. Remove hand wheel as instructed on page 23.
2. Remove stitch indicator plate screws, Fig. 42,
regulator hinge screw and spring washer.
3. Remove feed regulator and indicator plate as a

REGULATOR
HINGE REPLACEMENT:
SCREW

1. Insert regulator into the machine. Make certain
that the roller of feed forked connection rides in
slideway of regulator block.
• INDICATOR
PLATE 2. Replace hinge screw and washer. The prongs of
SCREWS the washer should face inward.
3. Replace indicator plate screws.
Fig. 42. Removing Feed Regulator 4. Replace hand wheel as instructed on page 23.

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REMOVALS AND REPLACEMENTS

SET SCREW J FEED ROCK SHAFT NUT F ECCENTRIC G SET SCREW H

HINGE
SCREW C

SET SCREW E ROCK SHATING ECCENTRIC B SET SCREW D NUT A

Fig. 43. Removing and Replacing Rock Shafts

FEED LIFTING ROCK SHAFT FEED ROCK SHAFT ASSEMBLY

REMOVAL: REMOVAL:

1. Remove bottom cover. 1. Remove bottomcover
2. Remove nut A and eccentric B, Fig. 43, disen- 2. Remove nut F and eccentric G, Fig. 43, disen-
gaging feed lifting rock shaft from feed connecting gaging feed rock shaft from feed forked connection.
rod. 3. Using an offset screw driver, remove hinge screw
3. Using an offset screw driver, remove hinge screw C, disengaging feed lifting rock shaft.
C, disengaging feed bar. 4. Loosen center set screws H and J, slide the shaft
4. Loosen center set screws D and E, slide the centers aside and remove feed rock shaft with
shaft centers aside and remove feed lifting rock feed bar and feed dog.
shalt.
REPLACEMENT:
REPLACEMENT: 1. Install feed rock shaft with feed bar and feed
dog in reverse order of its removal.
1. Install feed lifting rock shaft in reverse order of 2. Replace feed lifting hinge screw.
its removal. 3. Adjust feed dog as instructed on pages 6, 7 and 8.
2. Adjust feed dog as instructed on pages 6, 7 and 8. 4. Replace bottom cover.
3. Replace bottom cover.

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REMOVALS AND REPLACEMENTS

FEED LIFTING ROCK SHAFT CONNECTING ROD

REMOVAL: REPLACEMENT:

1. Loosen top cover screw and turn cover aside.
1. Insert connecting rod into upright arm through
2. Remove two cap screws, Fig.44, and remove bottom of machine, so that it fits around bottom
connecting rod cap. half of pulley (or gear) hub on eccentric, Fig. 44.
3. Remove bottom cover. 2. Replace connecting rod cap and fasten with cap
4. Remove eccentric screw and nut, Fig. 45, dis- screws.
engaging connecting rod from teed lifting rock 3. Replace eccentric screw and nut, Fig. 45, en-
shaft.
gaging connecting rod to feed lifting rock shaft.
5. Remove connecting rod through bottom of machine. 4. Adjust feed dog height as instructed on pages 6
and 7.

5. Replace bottom cover and close top cover.

FEED FORKED CONNECTION

FEED ROCK SHAFT ECCENTRIC SCREW
AND NIT
CAP
SCREW

CONNECTING FEED LIFTING ECCENTRIC SCREW
ROD CAP ROCK SHAFT AND NUT

Fig. 44. Removing Feed Connecting Rod Fig. 45. Removing Feed Connecting Rod and Feed Fork

REMOVAL: REPLACEMENT:

1. Remove feed regulator as instructed on page 20. 1. Insert feed forked connection into upright arm
2. Open top cover and remove bottom cover. through bottom of machine, so that it fits around
3. Remove eccentric screw and nut, Fig. 45, dis- eccentric, as shown in Fig. 44.
engaging feed forked connection from feed rock 2. Replace eccentric screw and nut, Fig. 45, en-
shaft.
gaging feed forked connection to feed rock shaft.
4. Remove feed forked connection through bottom of 3. Replace feed regulator as instructed on page 20.
machine. 4. Adjust position of feed dog as instructed or
pages 7 and 8.
5. Replace bottom cover and close top cover.

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