Pfaff 441-O User manual

®442-R
441 -O
442-0
Service Manual
Pfaff, D 6750 Kaiserslautern, Postfach 3020/3040, Telex: 045753
From the library of: Superior Sewing Machine & Supply LLC

Important note:
ThisServiceManual applies also to the Raff 441-0 and 442-0. Deviations in the illustrations do not
affect the adjustment of the machines. The Sen/ice Manual is based on a two-needle machine.
When adjusting a single-needle machine, simply ignore the adjustment procedure for the left
needle and the left sewing hook. A separate Service Manual is available for adjusting the
Pfaff 441-R (0)-705/03: -755/03.
Tools, gauges and other items required for adjusting Raff machines 442-R, 441-0 and 442-0
1 set of screwdrivers with blades from 2 to 10 mm wide
1 set ofwrenches withopeningsfrom 7 to 14 mm wide
1 set of alien keysfrom 2 to 6 mm
1feed dog gauge, part No. 91-129995-05
1adjusting gauge, part No. 91 -129573-91
1C-clamp, part No. 880137/00
1 metal rule
1wrapper of needles: system 134 (for7 mmfabric clearance)
system 134-35 (for 9 mm fabric clearance)
2strips of white
paper
Sewing thread and testing material
Technical data
Maximumsewing speed: 5000 s.p.m.
Balance wheel: 65 mm eff. dia.
Drive: clutchmotor0,550 kW(% HP)
lever-operated Stop motor0,550 kW(% HP)
electronic-stop-motor 0,550 kW(%HP)
Needle system: 134 (for7 mmfabric clearance)
134-35 (for 9 mm fabric clearance)
Fabric clearance: 7 or 9 mm
From the library of: Superior Sewing Machine & Supply LLC

Correct
setting:
Scale ring in reverse-feed control
With the stitch length set at "0", the "0" mark on scale ring 3 should be opposite
mark 4.
1.0.1
1.1 Take the needles out of the needle holder.
1.2 Remove the knee levertogetherwith its coupling sleeve.
1.3 Tum knurled disc 1 as far as it will go in the direction in which the reverse-feed control
starts to move downwards.
1.4 Loosen screw 2 and turn scale ring 3until the "0" mark Is opposite mark 4.
1.5 Inthis position, tighten screw 2.
From the library of: Superior Sewing Machine & Supply LLC

Correct
setting:
Zeroing the bottom feed
The feed dog must not move forward when you turn the balance wheel with the
stitch length set at "0".
2.0.1
2.1 Remove the left upper plastic plug on the back of the arm standard.
2.2 Unscrew the gearcase cover on the underside of the machine base (collecting the oil, if
any, in a container).
2.3 Loosen screw 1 of the counter-balance.
2.4 Make sure the stitch length is set at "0", then loosen both clamp screws 2 (Fig. 2.0.1) just
sufficiently to allow crank 3 to be turned on its shaft against resistance.
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2.5 Tofacilitateadjustment,insertascrewdriverinthe slot offeed rock shaftcrank4 (Fig.2.0.2).
2.0.2
2.0.3
2.6 Turn the balance wheel and simultaneously adjust rod 5 (Fig. 2.0.3) connected to
crank 3 (Fig. 2.0.1) until the feed dog (or rather the screwdriver in the feed rock shaft
crank) Is completely motionless.
2.7 Inthis position, tighten both clamp screws 2 securely.
2.8 Leave the screwdriver in the slot of feed rock shaftcrank 4 (Fig. 2.0.2) for the subsequent
adjustments.
2.9 Check this adjustment (see "Correct setting").
From the library of: Superior Sewing Machine & Supply LLC

Correct
setting:
3.0.2
Bottom feed driving motion
With the machine set for its longest stitch and the needle bar positioned at bottom
deadcenter, the feed dog should not move when the reverse-feed control is operated.
J
3.0.1
3.1 Loosen both screws 1 (Fig. 3.0.1) Infeed driving eccentric 2 just sufficientlyto allow the
eccentric to be turned on its shaft against resistance.
3.2 Bring the needle bar to bottom dead center.
3.3 Pushthe C-clampontothe needlebar,push itupagainstthe needlebarframeandtighten
its screw.
3.4 Set the machine for its longest stitch.
3.5 Movethe reverse-feed control up and down and simultaneously turn feed driving
eccentric 2 until its notch (see arrow in Fig.3.0.1) is visible and the feed dog (or
rather the screwdriverin feed rock shaft crank3) is completely motionless.
3.6 Inthis position, securelytighten the accessible screw 1.
3.7 Remove the C-clamp from the needle bar.
3.8 Also tighten the second screw 1.
3.9 Pull the screwdriver out of the slot in feed rock shaft crank 3.
3.10 Check this adjustment (see "Correct setting").
From the library of: Superior Sewing Machine & Supply LLC

Correct
setting:
Lower needle bar driving crank
With the stitch length set at "0", the flat surface of lower needle bar driving crank 4
should be so positioned that its edge is parallel to the edge of the bedplate.
4.0.1
4.0.2
4.1 Take out screws 1 of clip bracket 2 and remove the bracket.
4.2
Set the machine for its longest stitch.
4.3 Loosen screws 3.
4.4 Set the stitch length at "0".
4.5 Turn lower needle bar driving crank 4 so that the edge of its flat surface is parallel
to the edge of bedplate.
4.6 Inthis position,tighten the accessible screw 3.
4.7 Againset the machineforitslongeststitchand tightenthe second screw3,too.
4.8 Replace bracket2 and tighten screws 1.
From the library of: Superior Sewing Machine & Supply LLC

Correct
setting:
5.1
5.2
5.3
5.4
Counter-balance
With the machine set for its longest stitch, counter-balance 2 should move freely
when the reverse-feed control is operated.
5.0.1
Set the machine for its longest stitch.
Makesure screw 1 ofcounter-balance2 is loose (Fig.5.0.1), move the latteras faras it will
go, turning itinthe direction indicated by an arrow.
Turnthe counter-balancebackbyabt.1 mmagain, and inthis position tighten screw1.
Check this adjustment (see "Correct setting").
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Correct
setting:
6.1
6.2
6.3
6.4
6.5
6.6
6.7
6.8
6.9
Bottom feed lifting motion
When the needle bar is at bottom dead center, the feed dog should be at its
highest point.
n
W
Set the stitch length at "0".
Loosen clamp screw 1.
Turn out screw 3 incollar 2 by half a turn.
Insert ascrewdriver in the slot of bottom feed lifting crank 4 and bring the needle bar to
bottom dead center.
Push the C-clamponto the needle bar, push itup against the needle bar frame and tighten
its screw.
Turn coiiar 2 on the collar of the lifting eccentric until the feed dog (or screwdriver)
is at bottom dead center.
Inthis position, tighten clamp screw 1.
Remove the C-clampfrom the needle bar and tighten screw 3.
Pull the screwdriver out of the slot of bottom feed lifting crank 4 and check this adjustment
(see "Correct setting").
From the library of: Superior Sewing Machine & Supply LLC

Correct
setting:
7.1
7.2
7.3
7.4
7.5
7.6
7.7
Note:
Clearance between presser foot and needle plate
Withpresserbar lifter1 raised, there shouid be a ciearance of7.0 mm (needie system
134) or 9.0 mm (needle system 134-35) between presserfootand needle plate.
7mm(9mm)
f
Take out the two screws of the face cover and remove the latter.
Unscrew the cover on the back of the machine arm.
Raise presser bar lifter1 and screw on the presser foot.
Loosen both screws 2 inthe presser bar collar.
Push the 7-mm (or9-mm)thickpart ofthe gauge under the presserfootso that itsrecess
faces downwards (Fig.7.0.1).
Push the presserfoot downonto the gaugeand adjustItlaterally so that its sides are
parallel to the edges of the needle plate slot.
Inthis position, tighten both screws 2.
Adjust the presser footpressure by turning regulating screw4 (Fig. 9.0.1)inor outwhen
you make asewing test.
From the library of: Superior Sewing Machine & Supply LLC