Singer 491D Manuel utilisateur

SERVICE MANUAL FOR SINGER 491D SEWING MACHINE

PARTS CHART FOR 491D200GA & 491D300GA

SEWING MACHINE

Restored from web copy

Available from

Internet Archive

archive.org

Form U251 (1273)

T H E S I N G E R C O M PA N Y

Service Manual

Machine

491D

CONTENTS

Page

* A Trademark of THE SINGER COMPANY

Description of Machine . . . . . . . . . . . . . . . . . . . . 1

ADJUSTMENTS

To set Needle Bar at Correct Height . . . . . . . . . . . . . 2

To Set Check Spring Height . . . . . . . . . . . . . . . . . . 2 - 3

To Set Check Spring Tension . . . . . . . . . . . . . . . . . 3

To Set Presser Bar at Correct Height . . . . . . . . . . . . . 4

To Time the Sewing Hook and also Set the Sewing

Hook Sidewise in Relation to the Needle . . . . . . . . . . 5

Feed Reverse Lever . . . . . . . . . . . . . . . . . . . . . . 6

To Time the Feed . . . . . . . . . . . . . . . . . . . . . . . 6

To Set Feed Dog at Correct Height . . . . . . . . . . . . . . 7

REMOVAL AND REPLACEMENT OF PRINCIPAL ASSEMBLIES

To Remove the Sewing Hook . . . . . . . . . . . . . . . . . . 8

To Replace Oil Filter 143042 . . . . . . . . . . . . . . . . . 9

To Replace the Sewing Hook . . . . . . . . . . . . . . . . . . 9

To Remove and Replace the Hook Shaft . . . . . . . . . . . . . 10

The Oil Pump . . . . . . . . . . . . . . . . . . . . . . . . . 11

To Remove and Replace the Upright Arm Shaft . . . . . . . . . 12 - 13

To Remove and Replace the Needle Bar . . . . . . . . . . . . . 13

To Remove and replace the Presser Bar . . . . . . . . . . . . 14

Needle Thread Take-up . . . . . . . . . . . . . . . . . . . . 14 - 16

To Remove and Replace Arm Side Shield Wick, Needle

Bar Wick and Needle Bar Connecting Stud Wick . . . . . . . 16

To Remove Oil Wick Holder . . . . . . . . . . . . . . . . . . 17

To Install New Oil Wick Holder . . . . . . . . . . . . . . . . 17 - 18

The Arm Shaft . . . . . . . . . . . . . . . . . . . . . . . . 18 - 21

DESCRIPTION

Class 491D Machines are high speed, rotary hook, fully automatic lubricated

long arm ﬂat bed lockstitch machines with drop feed and hand operated reverse

feeding mechanism. Recommended for general stitching operations on a range of

light to heavyweight fabrics.

- 1 -

GENERAL FEATURES

Balanced horizontal axis rotating hook.

Pendant link feed with feed leveling hinge pins.

Dial type stitch regulator on feed reverse lever,

Thread take-up lever guard. Equipped with improved head end lubrication.

Knee lifter mechanism is integral with the machine base and oil reservoir.

Arm top cover with oil ﬂow indicator.

The arm is provided with a seat for mounting a light ﬁxture.

SPECIFICATIONS

Needle bar stroke 30.5 mm - 491D200AA

36.5 mm - 491D300AA

Clearance under presser foot 7.2 mm - 491D200AA

7.9 mm - 491D300AA

(Maximum lift of presser foot when raised with knee lifter - 12.7 mm)

Maximum stitch length 6 S.P.I.

Maximum speed 5,500 S.P.M. - 491D200AA

5,000 S.P.M. - 491D300AA

Oil SINGER* Type "C" Oil

Bed size 475 mm x 178 mm

58.73 mm − 491D200AA

66.01 mm − 491D300AA

- 2 -

TO SET NEEDLE BAR AT CORRECT HEIGHT

Fig. 2

THROAT PLATE

SEAT

TIMING

MARK

PREPARATION:

Remove face plate, slide

plate and throat plate. See

that needle is correctly set

in needle bar.

Lower end of bushing A,

Fig. 2 must be set as shown

in Fig. 2. To reset bushing,

loosen screw B.

CHECK:

When needle bar is at its

lowest point (during rotation

of machine pulley), UPPER

TIMING MARK on needle bar

should be level with lower end

of bushing.

Check timing of hook as

instructed on page 5.

SETTING:

Loosen clamping screw C, Fig. 2. Raise or lower needle bar so that UPPER

TIMING MARK is level with lower end of bushing. Then securely tighten screw C.

Replace throat plate and slide plate.

When replacing the face plate, make certain that the screw holes in the

face plate gasket are aligned with the respective screw holes in the face plate;

avoiding injury to the gasket and consequent oil leakage.

TO SET CHECK SPRING HEIGHT

PREPARATION:

Thread the machine and place a lightweight material under presser foot.

CHECK:

Turn machine pulley over toward operator slowly. When take-up lever

begins to rise, check spring D, Fig. 3 makes a slight dip and a return to its

higher position. Later, as take-up lever approaches top of stroke, check

spring D should be drawn all the way down; setting the stitch. As lever de-

scends, check spring D returns to rest.

- 3 -

SETTING:

Loosen screw E, Fig. 3. Turn stud F,

Fig. 3 (at the same time turning entire ten-

sion assembly) either over toward left to

lower check spring and decrease its movement,

or over toward right to raise check spring

and increase its movement. Securely tighten

set screw E.

NOTE: Under certain conditions of

tacking, it may be necessary to set the

check spring higher than it is otherwise

normally set.

CAUTION: Check spring height setting

must be checked each time a different foot

is applied to machine.

TO SET CHECK SPRING TENSION

PREPARATION:

Thread the machine, securely tighten

set screw E, Fig. 4. Make certain thumb nut

is on stud F, ﬁg. 4.

CHECK:

Tension on check spring D, Fig. 4,

should be sufﬁcient to ensure action at top

speed; but still light enough to permit it-

self to be drawn all the way down (as take-

up lever approaches height of stroke) before

any thread is drawn through the tension

discs.

SETTING:

Using a large screwdriver in slot of

stud F, turn stud either over toward left to

decrease tension or over to right to in-

crease it, as shown.

NOTE: The tension on the check spring may require different settings

depending upon the size of thread used. Heavier thread requires more tension

to ensure correct thread control.

Fig. 3

Fig. 4

HIGHER

LOOSEN

LOWER

TIGHTEN

TENSION

LESS

TENSION

- 4 -

TO SET PRESSER BAR AT CORRECT HEIGHT

Fig. 5 Fig. 6

PREPARATION:

Remove face plate and slide plate.

CHECK:

1. When presser foot rests ﬁrmly upon throat plate (with feed dog below throat

plate) there should still be some clearance between guide bracket G, Fig. 5

and lifting lever link H, as shown in Fig. 5.

2. When presser foot is at its highest point and needle bar is at its lowest,

top of presser foot should clear lower end of needle bar, as shown in Fig. 6.

SETTING:

Loosen clamping screw J, Fig. 5. Raise or lower guide bracket G, as

required. Securely tighten screw J.

CAUTION: Whenever guide bracket has been moved on presser bar, inspect the

check spring for correct setting, as instructed on pages 2 and 3.

CLEARANCE

FOOT

RESTING

FIRMLY

UPON

THROAT

PLATE

AT LOWEST

POINT

JUST

CLEAR

AT HIGHEST

POINT

- 5 -

PREPARATION:

Remove presser foot, slide plate, throat

plate and feed dog.

CHECK:

When lower timing mark on needle bar is

level with lower end of lower needle bar

bushing A as shown in Fig. 7, the point of the

sewing hook should be at the center of the

needle, as shown in Fig. 7.

Also, when point of sewing hock passes

needle, clearance between hook point K,

Fig. 8 and needle should be approximately

equal to thickness of a piece of ordinary

notepaper (about .13 mm), as shown in Fig. 9.

NOTE: Not only point of sewing hook

but entire "FLAT" of hook point should clear

scarf on needle blade. Normally, a .5 mm

clearance is provided between hub of hook

and oil retaining collar.

SETTING:

Loosen two set screws L, Fig. 7 in hub

of hook. Then retighten one of the set

screws very lightly so that the sewing hook

can still be turned on the shaft.

Hold shaft immovable and turn hook as

required to bring point of hook to center

of needle as shown in Fig. 7 and at the same

time adjust clearance between needle and

hook point as shown in Fig. 9.

Tighten set screws L lightly, turn

machine pulley to make certain the sewing

hook is correctly set in relation to the

needle. Then securely tighter set screws L.

TO TIME THE SEWING HOOK AND ALSO SET THE

SEWING HOOK SIDEWISE IN RELATION TO THE NEEDLE

Fig. 7

Fig. 8

Fig. 9

HOOK

POINT

NOTEPAPER

FLAT OF

HOOK POINT

LOWER

TIMING

MARK

HOOK POINT

AT CENTER

OF NEEDLE

ON UPWARD

STROKE

- 6 -

FEED REVERSE LEVER

Before the machine leaves the factory, the

spring tension of the feed reverse lever is set

at an appropriate tension for easy and comfortable

sewing operation.

If it is necessary to adjust the feed reverse

lever spring tension, tip machine back and loosen

feed reverse lever spring retainer screw Y3

holding the spring retainer 23 on the machine leg.

Move spring retainer 23 up or down, as required,

and ﬁrmly tighten screw Y3.

The lighter the tension, the easier it is to

operate the feed reverse lever, however the ten-

sion should be set a little heavier for maximum

stitch length and high speed sewing.

Normally, the machine is adjusted to sew a

maximum stitch length of 4.2 mm. This however,

can be changed to 5.1 mm (5 S.P.I.) is desired,

by turning over the feed regulating dial stopper

C4 on the underside of the feed reverse lever, as

shown in Fig. 10.

CAUTION: MAKE SURE the feed dog clears the front and rear edges of the

throat plate slots when maximum stitch length is changed to 5.1 mm.

TO TIME THE FEED

Before the machine leaves

the factory, the fear and feed

lifting eccentric is set for

average sewing conditions;

having the timing screw (screw

M which appears immediately

after set screw N, Fig. ll,

when feed eccentric is rotated

toward the operator) align on

the timing mark provided for

it on the arm shaft.

The timing screw M, Fig.

ll, on the feed and feed lift-

ing eccentric should be se-

curely tightened after it has

been aligned on the timing mark on the arm shaft. The set screw M should also

be securely tightened.

If for any reason, it is necessary to alter the timing of feed and feed

lifting eccentric, the eccentric should be adjusted and locked in desired

setting with the timing screw M and the set screw N.

Fig. 11

Fig. 10

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