Pfaff 418, 438, 838 Service Manual

418

438

838

PFAFF

Service

innovation

Manual,

madebyPFAFF

Contents

1

Preparations for adjusting

2 Centring the needle in

Setting

the

3

Stitch

4

4.1

Zeroing

4.2

Stitch

4.3

Limiting

Adjustung

4.4

Adjusting

5

Adjusting

6

7

Needle position "left, centre, right"

8 Adjusting

Adjusting

9

Zeroing

10

10.1

Adjustment with

10.2

Adjustment

Adjusting

11

12

Bottom

Tensloning

13

14

Adjusting
Preliminary adjustment of

15
16

Oil distributor ring
Hook timing

17

18

Final
Bobbin

19

19.1

Position of bobbin

19.2

Timing
Adjusting

20

21

Clearance

22

Feed

Oil

23

24

Tension

25

Lubrication of

Hook

26

27

Knee

28

Knee lever play

Bobbin

29

30

Thread

Presser

31

Annex

32

Needle

33 Left,

34

Needle

stabilizing rod parallel to the

width

control

the

needle

width

the

the

the
the

the

the

the

for straight stitching 8

scale

maximum stitch width

locking

needleinthe
needle

needle

stitch length

bottom

feed

closed

with

open

the

bottom

feed

liftingmotion

the

driving belt in

the

hook bearing bracket

and

hook-to-needle

adjustmentofneedle

case

opener

case

the

bobbin

slack

between

height

case

thread

presser

mechanism

dog

check

the

valve

release

zigzag

lubrication

lever

stroke

limitation

winder

check

spring

foot

pressure

for

machines

vibration

center

and

position

right

lever

the

needle hole (in sewing direction) 5

needle

bar

lever

needle

hole (sideways)

throw

position lever

scale

ring

gearcase

gearcase

feed

driving motion

the

gearcase

needle

bar height

clearance

bar

height

opener
opener

control

foot

and

needle

eccentric

and

thread

regulator

equipped

needle

positions

with

zigzag

control

-716/..

Page

2

6

8

9
10
11

12

13

14

16
25

18

18
19

20

21+22

23
24
25

26

27

28

29

29+30

31

32
33

34+35

36

37+38

39

40

41
42
43
44

44

45

46+47

48+49

Notesonsafe

machine

operation:

The machine must only be usedfor the purpose It

When

converting Itto another version, allvalid safety rules

has

been designed for.

mustbefollowed.

Service and repair workmust only be performed byqualifiedpersaonel.

Workon liveparts Is not permitted, apartfrom exceptions according to

Service manual

418 438

418-716/.. 438-716/..

For

the

separate

Important

Donot use a C-clamp on the needlebar of Pfaff

Its special coating. Make

chinesInoperation forthe firsttime orwhich

For shipping
and

838. ItIstherefore

the

machine

418,438,838

appliesto the following versions:

adjustment of automatic fancy-stltch

manuals.

note

sure

you

check

purposes

for

the

oilis drained from

necessarytofill

the

first

time.Astickeronthe

this housing with 75 c.c. of oil

mechanism

418,438

the

hook lubrication

have

been

the

needle

machine

-718/01

and

Idlefor a longer period (I.e. 1or 2 months).

vibrating eccentric housingof the

arm

servesasa

DIN

57105

and VDE0105.

838

838-716/..

and

thread trimmer -900/..

there

838 machinesasthiswould damage

system

(see

Section 27) on ma

Raff

(see

Section26) before operating

reminder.

418,438

are

When the machine Is given a general overhaul put about 2 c.c.of piniongrease, with a dripping point of

160°C, inthe bevel-gear

grease

canbeobtained

case

of the hook. We recommend you use Molykote-Longtherm 00. This

from us

under

No. 280-1-120 199.

Tools,

gauges

and

other

1

setofscrewdrivers

1

set

of alien

1

setofwrenches

with2to10mm

keys

from 1.5 to 6 mm

with

openings

1 wrench with 27-mm-wlde

1

metal

ruler

accessories

opening

required

wide

for

blades

from 7 to 14 mm wide

adjusting

the

machines

1 cylindrical pin (5 mm dia.), No. 13-030 341-05

1

feed

dog

gauge,

No. 91-129

1 hook bearing bracket

1

wrapperofsystem

2

strips

of white

paper
1 rollof
Sewing

adhesive

thread

and

tape

testing

438

gauge.

needles

material

995-05

No. 91-129

996-05

1

Preparations

for

adjusting

Note:

To allow the machine to be blocked with

bearing plate (Fig.1.0.1.)

has

four holes.

the

needle

baratthe

required position

Afterpositioning themeedlebar as requiredpush the pinintothe appropriatehole

it

enters

the

recess

behind the bearing plate, thus blocking the machine.

5mrn

the

until

1.0.1

1-1

Take

out

screws

1 from

the

cast

iron

cover

and

needle bar lubricating wickfromits hole inthe coversealing plate.)

remove

.2 Drainthe oilfromthe needle vibratingeccentric housing.

the

cover. (Do not

remove

the

1.0.2

1.3

.4
.5

.6

.7 Unscrew alien screws 5 (do not remove cover plate 6 it is stillconnected to oilwick 9).

.8 Loosen clamp screw7 and pullstabilizing rod 8 down a

.9

.10 Insert a new needle (system 438) and push itup as faras it

Unscrew

Take

out

Take

out

Loosen

Remove

face

the

the

two

screwsinthe

screw2and
screw3and

screv^jof

plate 6 with oilwick 9.

front.

remove the
remove

thejthread

face

cover

presser

the

thread guide.

control

and

and

remove

foot.

remove

the

cover.

the

latterbypullingitdownwards.

little.

will

go; the longgroove should

1.0.3.

1.0.4.

Centring

When

the

needle

the

needleInthe

the

stitch width is

must

enter

the

set

needle

at "0"

needle

hole

and

the

hole

exactlyinthe

(in

needle

sewing

direction)

position lever is in its central position

middle (in

sewing

direction).

1

2

3

4 L(
5

6
7 C

S'

R

B

Ti

th

In

Setting

the

stabilizing

rod

paralleltothe

needle

bar

Setting: Stabilizing rod 4

The

lobe of eccentric

must

be parallel to

stud3must

the

needle

bar.

always point downwards.

Adjustment:

Bring

the

needle

3.1

sure

arm).

bartot.d.c.

that

lock

machine).
lulaking

machine

Loosen

jam nut 2 und turn eccentric

Insert

stabilizing rod 4 in

Position stabilizing rod 4sothat

eccentric

Hold

paralleltothe
In

stabilizing

this

position

stud

3.

rod

needle
tighten

and

screw

7 Is

the

loop of oil wick 5.

4 firmly

bar

(Fig.

eccentric

Insert

loose,

the

and

3.0.2).

stud

recess

the

pin In

loosen

stud3so

at Itstop

turn

eccentric

3 with nut 2.

hole

"2"ofthe

screw1(accessible

bearing

from

plate

the

that Its lobe points downwafds.

end

(see

arrow in Fig. 3.0.1)

stud

3 until

stabilizing

(to block

backofthe

touches

rod

4 Is

the

3.8 Tocheck thatitis parailelto the needle bar firstpullstabilizing rod4 downand then push

it up againasfarasit

necessary

•9

Making sure that stabilizing rod 4 is still in contact witheccentric stud 3 tighten clamp

screw

turn eccentric

7 securely.

will

go, making

stud

3 accordingly).

sure

that guide 6

does

not move to the

side

.10 Remove the cylindricalpin from the hole inthe bearing plate.

.11 Bring

.12

the

machine

Screw

on coverplate 8.

needle

arm.

bar

to b.d.c.

and

tighten

screw

1 which is

accessible

from

the

backofthe

(if

4

4.1

Stitch

Zeroing

width

the

control

needle

for

straight

stitching

Setting:

When

the

stitch

width

controlissetat"0"

the

needle

bar

must

not

movetothe

side.

4.0.1

Adjustment:

4.1.1

.2

.3 Loosen clamp screw 4 and letlockinglever 5 move back

.4 In this position, tighten

.5 Move stitch widthlever 6 to the rightasfarasit

.6 Turnon the masterswitch and let the machine runslowly. Move

.7 Inthis positionpush screw 2 to the rightasfarasit

Set

needle position lever 1 at its central position.

Loosen

the

screws2and

left until

the

3.

needle

clamp

bar

screw

stops

4.

swinging

until

will

go (i.e.towards "0").

sideways.

will

go and tighten it.

itsspring isrelaxed.

stitch

width lever 6 to

.8 Check this adjustment (see "Setting").

.9
.

10

Switch

off

Screw3is

master

still

switch.

loose.

8

4.2

Stitch

width

scaie

Setting:

When

the

stitch width control is

mustbeopposite

mark

3 of

the

setat"0"

the

stitch width lever.

zero

markonthe

stitch width

scale

4.0.2

Adjustment:

4.2.1

.2

.3

.4

.5

Movestitch

Loosen

Adjust

ieverl.

screws

the

width

lever1 to the rightas faras it

2.

stitch

width

in this position tighten both

Check

this adjustment

(see

scale

screws

"Setting").

untii

will

go.

the

zero

markisopposite

mark

3 of

stitch

2.

9

width

4.3

Setting:

Limiting

When

the

oppositethe

the

maximum

maximum

maximum

stitch

width

stitch width is

stitch

width

set,

mark

2 of

markonthe stitch

the

stitch width lever

width

scale.

must

be

4.0.3

Adjustment:

4.3.1

Note:

Move

stitch

width

width

markonthe

Inthis position move

as

itwillgo

and

tighten it.

lever1to

stitch

stop

the

left

until

width

scale.

screw

3 which limitsthe maximum stitch width upwardsasfar

mark2is

opposite

Iffor certain sewing operationsthe machine is equippedwith a

smaller

than

the

widest

to the width ofthe

Check

this

adjustment

stitch width indicated on

needle

hole rather than the graduation mark on

(see

"Setting").

10

the

scale,

limit

needle

the

the

the

stitch width

maximum

plate

whose

according

stitch width scale.

stitch

hole Is

4.4

Setting:

Adjusting

The

locking

position.

the

locking lever

lever2mustbeadjusted

sothat

stitch

width

lever

3can be

locked

inany

4.0.4

Adjustment:

4.4.1

.2
.3

.4

Loosenclampscrew1 of

ing

lever

does

not fall out.

Pull locking lever2 forward until it

In

this

position

locking

lever2,

presses

use

a screwdriverto turn hinge

making

sure thatthe pressurespringinthe

against

stitch width lever3.

stud

4 until

the

locking lever

right amount of play and then tighten clamp screw 1 (when at rest,

mustbemoreorless

Check this adjustment

parallel to stitch width

(see

"Setting").

11

lever

3).

locking

lock

has

lever2

the

Adjustingthe needle Inthe needle hole

When the stitch widthlever isturned to"0" and the needie position leveris initscentral

position

the

needie

shouid

enter

the

(sideways)

needle

hole

exactlyinthe

middle

(sideways).

m

I

Adjustment:

5.1

Turnthe needie positioniever to its central positionand the stitch widthleverto "0'

Bring the

Loosen
Turn

Inthis position tighten eccentric

Check

Replace

needle

jam

nut 1.

eccentric

this

adjustment

the

plastic plug on the

bar

to b.d.c.

stud2until

(see

the

needleIscentredInthe

stud

2 with nut 1.

"Setting").

undersideofthe

arm.

needle

hole

sideways.

6

Adjusting

the

needle

throw

Setting:

Whenthe

in

hole

2) it

needle

must

bar

risesfrom the bottom position on the rightofits throw to t.d.c. (pin

not

movetothe

side

when

the

stitch width

leverismovedtoand

coAmm

fro.

6.0.1

Adjustment:

.1

.2

.3

.4

.5

.6
.7

.8

Loosen screws1 ofzigzag eccentric2 justenough toallow the eccentricto be turned on

its

shaft

against

strong

resistance.

Bring

the

needle

bar

from the bottom position on

the

right of its throw to t.d.c.

Insert cylindrical pin in hole "2" ofthe bearing plate (to blockthe machine).
Moveeccentric 2 sidewayson itsshaft untilthereis a clearance of about 5 mm between it

and

the

rightwall of the casting.

Turn

eccentric2on

width

leverismovedtoand

Check

this

adjustment

Remove

Screws1are

cylindrical pin from hole "2"ofthe bearing plate.

still

its

(see

loose.

shaft

fro.

"Setting").

(See

until

Fig. 8.0.1.).

the

needle

13

bar

stops

vibrating

when

the

stitch

Needle

position

When

the

centre.

When
needle

stitch

the maximum stitch width is

hole should be equidistant from the

"left,

centre,

width

leverissetat"0"

right"

set

the

the

needle

right

centre

must

and

left positions of

(Fig. 7.0.2).

enter

the

needle

the

needleInthe

holeinthe

Turn

needle

position lever to its "central" position

and

the stitch width lever to "0".

Place a piece ofwhite paperon the needle plate and hold itinposition.
Turnthe balance wheel initsnormal direction of rotationand letthe needlepierce the paper.

Raise

the

needle

again

a little

and

Turn

the

stitch

width

levertothe

hold the

"maximum"

paper

stitch

in position.

width.

Turn the balance wheel in its normal direction of rotation and let the needle pierce the

paper

again.

Remove

the

paper

from

under

the

needle

and turn the

balance

wheel

one

complete

Turn stitch width leverto "0" again.

Place the piece of paper under the needle again and position itso that the needle pierces

the first hole exactlyasbefore.

turn.