Pfaff Industrial 337 Leitfaden

ADJUSTMENT MANUAL

296-12-18 644/002

Justieranleitung engl. 06.09

This Adjustment Manual is valid for machines

from the following serial numbers onwards:

# 7 207 686

337

The reprinting, copying or translation of PFAFF Service Manuals, whether in whole or in part,

is only permitted with our previous authorization and with written reference to the source.

PFAFF Industriesysteme

und Maschinen AG

Hans-Geiger-Str. 12 - IG Nord

D-67661 Kaiserslautern

Adjustment

11 - 1

11 Adjustment

11.01 Notes on adjustment

All adjustments in this instruction manual refer to a completely assembled machine and

must only be carried out by appropriately trained technical personnelappropriately trained technical personnel

appropriately trained technical personnelappropriately trained technical personnel

appropriately trained technical personnel. Machine covers

that have to be removed and replaced for checks and adjustment work are not mentioned in

the text.

The screws and nuts indicated in brackets () are for the fixation of machine parts that have to

be unscrewed before adjustment and tightened again afterwards.

11.02 Tools, gauges and other equipment for adjusting

●Screwdrivers with blade widths from 2 to 10 mm

●Spanners (wrenches) in sizes from 7 to 14 mm

●Allen keys from 2 to 6 mm

●Metal rule (part No. 08-880218-00)

●Needle-rise gauge (part No. 61-111600-01)

●Screw clamp (part No. 61-111600-35/001)

●Gauge, 7-mm, for lifting presser stroke (part No. 61-11163 0-14)

●Needles, system 134-35

●Sewing thread and material for stitching off

11.03 Abbreviations

t.d.c. = top dead centre

b.d.c. = bottom dead centre

Adjustment

11 - 2

●Re-position feed dog 1(screws 2) according to Requirement.

Fig. 11 - 01

11.04 Adjusting the basic machine

11.04.01 Position of the bottom feed dog crosswise to sewing direction

Requirement

The bottom feed dog 1must clear the feed slot by the same amount at the left and right.

Adjustment

11 - 3

11.04.02 Adjusting the bottom feed dog in sewing direction

Requirement

With the longest stitch length set, bottom feed dog 5must clear the feed slot by the

same amount at the front and rear end of its stroke.

Fig. 11 - 02

●Set the longest stitch length.

●Position clamp sleeve 1(screws 2and 3) on the flat of shaft 4as far to the left as

possible, making sure that screw 2is still on the flat.

●Position feed dog 5(screws 6) according to Requirement.

Adjustment

11 - 4

11.04.03 Needle position in needle hole

Requirement

1. In sewing direction the needle centre must be at a distance of approx. 0.7 mm from

the front inside edge of the needle hole.

2. Crosswise to sewing direction the needle must be centred in the needle hole.

Fig. 11 - 03

●Turn the balance wheel to lower the needle into the needle plate.

●Position needle-bar frame 1(nut 2with locknut) according to Requirement 1.

●Position needle-bar frame 1(screws 3and 4) according to Requirement 2.

0.7 mm

Adjustment

11 - 5

11.04.04 Needle height (preliminary adjustment)

Requirement

With the needle bar at b.d.c. the clearance between needle bar and needle plate must be

15 mm.

Fig. 11 - 04

●Position the height of needle bar 1(screws 2) according to Requirement, but do not turn it.

15 mm

Adjustment

11 - 6

11.04.05 Top-feed pendulum

Requirement

At stitch length ”0” and the largest gather setting, presser bar 4must be at the centre

between needle bar guide and presser bar.

Fig. 11 - 05

●Push linkage rod 1(screw 2) fully up in its slot 3.

●Set stitch length at ”0” and press the pedal to set the largest gather setting.

●Position presser bar 4(screw 5) according to Requirement.

Adjustment

11 - 7

11.04.06 Feeding stroke of top and bottom feeds

Requirement

When the lower edge of the descending needle bar is

33 mm above the top edge of the

needle plate, the top and bottom feeds should not move when the stitch length

adjustment lever is activated.

●Set the longest stitch length.

●Loosen screws 1far enough, so that the eccentric 2can be turned on the shaft with

difficulty.

●Bring the needle bar into the appropriate position.

●Turn eccentric 2according to the requirement..

●Tighten screws 1.

Fig. 11 - 06

33 mm

Adjustment

11 - 8

11.04.07 Top feed stroke

Requirement

When lever 1is in the middle of its slot, vibrating presser 3

and lifting presser 4must be

at the same height above the needle plate.

Fig. 11 - 07

●Set stitch length at ”0”

●Set lever 1(screw 2) at the middle of its slot.

●Lower lifting presser

●Turn balance wheel in sewing direction until vibrating presser 4is at its highest point.

●Turn crank 5(screw 6) according to Requirement

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