Pfaff Industrial 3371-1/01 User manual

SERVICE MANUAL
3371-1/..
296-12-18 982/002
Justieranleitung engl. 01.11
This service manual applies to machines
from serial number 2 780 933 and software
version 0335/022 onwards

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

Index
Contents ................................................................................ Page
1Adjustment ........................................................................................................................... 4
1.01 Notes on adjustment .............................................................................................................4
1.02 Tools, gauges and other accessories for adjusting ............................................................... 4
1.03 Abbreviations .........................................................................................................................4
1.04 Explanation of the symbols....................................................................................................4
1.05 Basic position of the machine................................................................................................5
1.06 Work clamp zero point...........................................................................................................6
1.07 Aligning the work clamp ........................................................................................................ 8
1.08 Hook driver........................................................................................................................... 10
1.09 Preadjusting the needle height ............................................................................................ 11
1.10 Hook-to-needle clearance .................................................................................................... 12
1.11 Needle rise and needle guard .............................................................................................. 13
1.12 Aligning the hook race cover................................................................................................ 14
1.13 Work clamp height............................................................................................................... 15
1.14 Position of the thread wiper................................................................................................. 16
1.15 Position of the control cam.................................................................................................. 17
1.16 Position of the control roller................................................................................................. 18
1.17 Position of the drive shaft of the thread trimmer................................................................. 19
1.18 Aligning the stop plate ......................................................................................................... 20
1.19 Adjusting the trimmer solenoid............................................................................................21
1.20 Adjusting the engaging lever ...............................................................................................22
1.21 Position of the thread catcher and knife............................................................................... 23
1.22 Position of the release trip ................................................................................................... 24
1.23 Position of the release catch................................................................................................ 25
1.24 Needle thread tension release.............................................................................................26
1.25 Thread check spring and thread regulator............................................................................ 27
1.26 Bobbin winder drive wheel ..................................................................................................28
1.27 Work clamp initiator ............................................................................................................. 29
1.28 Changing the work clamp ....................................................................................................30
1.29 Cold start ............................................................................................................................. 31
1.30 Internet update of the machine software ............................................................................32
1.31 List of parameters................................................................................................................33
1.32 Error messages on the display............................................................................................. 40
1.33 Sewing motor errors............................................................................................................42
1.34 OTE-errors............................................................................................................................42
2Circuit diagrams.................................................................................................................43

Adjustment
4
1 Adjustment
Please observe all notes from Chapter 1Safety of the instruction manual!
In particular care must be taken to see that all protective devices are refitted
properly after adjustment, see Chapter 1.06 Danger warnings of the instruc-
tion manual!
If not otherwise stated, the machine must be disconnected from the electrical
power supply. Danger of injury due to unintentional starting of the machine!
1.01 Notes on adjustment
All following adjustments are based on a fully assembled machine and may only be carried
out by expert staff trained for this purpose.
Machine covers, which have to be removed and replaced to carry out checks and adjust-
ments, are not mentioned in the text.
The order of the following chapters corresponds to the most logical work sequence for
machines which have to be completely adjusted. If only specific individual work steps are
carried out, both the preceding and following chapters must be observed.
Screws, nuts indicated in brackets ( ) are fastenings for machine parts, which must be
loosened before adjustment and tightened again afterwards.
1.02 Tools, gauges and other accessories for adjusting
●Screwdrivers with blade width from 2to 10 mm
●Spanners (wrenches) with jaw width from 7to 14 mm
●1set Allen keys from 1.5to 6mm
●1Metal rule (part No. 08-880 218-00)
●1machine zero point gauge, part number 61-111 637-08
1.03 Abbreviations
t.d.c. = top dead centre
b.d.c. = bottom dead centre
1.04 Explanation of the symbols
In this adjustment manual, symbols emphasize operations to be carried out or important in-
formation.The symbols used have the following meaning:
Note, information
Service, repair, adjustment, maintenance
(work to be carried out by qualified staff only)

Adjustment
5
1.05 Basic position of the machine
Requirement
After being switched on the machine should position approx. 3– 4mm before t.d.c.
take-up lever.
●Switch on the machine.
●Press theTE key.
●Select parameter 605 with the corresponding +/- key.
●Press pedal forwards once briefly (machine positions in t.d.c. needle).
●Hold clutch 1(screws 2) and bring the needle bar into the appropriate position by turning
the balance wheel.
●Press pedal forwards again to re-check the position set.
●Conclude the adjustment by operating theTE key.
The distance from the clutch 1to the motor plate should be 3.5mm. In the
direction of rotation the second screw of the clutch section 3should be on the
surface of the motor shaft. The clutch section 1should be touching the 0-ring of
the axial bearing.
Fig. 1 - 01
1
2
2
3
3,5 mm

Adjustment
6
Fig. 1 - 02
1.06 Work clamp zero point
Requirement
After the machine ahs been switched on and parameter "608" selected,
1. the needle should be centred to the hole in the adjustment gauge,
2. the switch lugs 2and 4should be centred to the respective initiator.
When removing the work clamp holder, take care that the ball bearings in the
arm support do not drop out !
●Remove the work clamp holder and the lower feed plate .
●Screw adjustment gauge 1(part no. 61-111 637-08) to the work clamp drive unit.
Preliminary adjustment
●Move the work clamp drive unit by hand in accordance with requirement 1.
●Adjust switch lug 2(screw 3) and switch lug 4(screw 5) in accordance with requirement 2.
1
2
3
54

Adjustment
7
Fine adjustment
●Switch on the machine.
●In the input mode, select parameter "608", see Chapter 11 .03 Parameter input in the
instruction manual.
●If necessary, enter the access code, see Chapter 11 .04.01 Entering the access code in
the instruction manual.
●With the corresponding plus/minus key move the work clamp drive unit in accordance
with requirement 1, also see Chapter 11 .03 Parameter input.
●Switch off the machine.
●Remove adjustment gauge 1.
●Fit the lower feed plate and work clamp holder.
If, during the fine adjustment, the setting is ±5increments above or below the
value in X- andY-direction, the setting should be checked again in accordance
with requirement 2.

Adjustment
8
1.07 Aligning the work clamp
Requirement
The work clamp should be aligned in "X" and "Y" direction, so that it does not touch the
needle during sewing.
●Switch on the machine.
●Set the sewing area size (see Chapter 9.07 Adjusting the size of sewing area in the in-
struction manual)
●In the input mode, select parameter "610", see Chapter 11.03 Parameter input in the in-
struction manual
●If necessary, enter the access code, see Chapter 11.04.01 Entering the access code in
the instruction manual.
●Align work clamp 1(screw 2) so that the needle hole 3is in the centre of the work clamp
cutout.
Fig. 1 - 03
2
1
3
Y
X

Adjustment
9
Checking the "Y-direction"
●To check this adjustment, move along the maximum set sewing area size in "Y-direction"
by pressing the corresponding plus/minus keys (readjust if necessary).
●Call up parameter "609".
Checking the "X-direction"
●Move along the maximum set sewing area size in "X-direction" by pressing the
corresponding plus/minus keys.
●If necessary adjust the position of work clamp 1by entering a correction value "X" with
the corresponding plus/minus keys in "X-direction" in accordance with the requirement.
●Conclude the input.
When using the max. sewing area size (X=40mm, X =20 mm), the correction
value under parameter "609" must be set at "0".

Adjustment
10
Fig. 1 - 04
1.08 Hook driver
Requirement
1. When the balance wheel is turned, the machine should not bind.
2. The play of catch 7should be less than 0.1mm.
●Remove the hook.
●Loosen screws 1, 2and 3(remove motor 4).
●Move the eccentric shaft 5in accordance with requirement 1and twist it in accordance
with requirement 2.
●Tighten screws 1and 3.
●Move adjustment ring 6against the metal edge and tighten screw 2.
●Insert the hook.
If catch 7has too much play, the running noise of the machine increases. Too
little play may cause the machine to jam.
1
2
3
4
6
5
7

Adjustment
11
Fig. 1 - 05
1.09 Preadjusting the needle height
Requirement
With the needle bar in b.d.c., the upper marking on the needle bar 1should be flush with
the lower edge of the needle bar bush.
●Adjust needle bar 1(screw 2) in accordance with the requirement.
1
2

Adjustment
12
1.10 Hook-to-needle clearance
Requirement
With the needle at 2.4mm after BDC,
1. the hook 5should be 0.05 – 0.1mm behind the needle,
2. the top edge of the needle eye must be 0.8mm below the hook point and
3. the distance between the needle and the tip of the hook race should be 7.5mm.
●Loosen screws 1, 2and 3.
●Turn the eccentric pin 4in accordance with the requirements.
●Tighten screws 2and 3.
Screw 1remains loosened for further adjustments.
Fig. 1 - 06
1
3
0,05 - 0,1 mm
7,5 mm
4 2
0,05 - 0,1 mm
5
0,8 mm

Adjustment
13
Fig. 1 - 07
1.11 Needle rise and needle guard
Requirement
With the needle at 2.4mm after BDC,
1. the hook point should be centred to the needle and
2. the needle guard (see arrow) should slightly touch the needle.
●Turn catch 1(screw 2) in accordance with requirement 1, or move it in accordance with
requirement 2.
2
1

Adjustment
14
1.12 Aligning the hook race cover
Requirement
The needle should be centred to cutout Band the rear side of the needle flush to the
imaginary line A.
●Move the hook race cover 1(screws 2) in accordance with the requirement.
Fig. 1 - 08
22
1
1
B
A

Adjustment
15
Fig. 1 - 09
1.13 Work clamp height
Requirement
1. The work clamp should be 13 mm above the upper edge of the needle plate.
2. Both halves of the work clamp should be parallel to each other.
●Turn lever 1(nut 2and screw 3) in accordance with requirement 1.
●Move lift plate 4(screws 5) in accordance with requirement 2.
After aligning the work clamp, it is imperative to check the position of the
thread wiper, see Chapter 1.14. Position of the thread wiper! Danger of
needle breakage!
1
2
5
4
1
3
13 mm

Adjustment
16
Fig. 1 - 10
1.14 Position of the thread wiper
Requirement
When the thread wiper is centred to the needle, its lower edge should be 14 – 15 mm
above the upper edge of the needle plate.
●Bring the thread wiper 1into the appropriate position by operating the work clamp
manually.
●Move thread wiper 1(screw 2) in accordance with the requirement.
2
1
14 - 15 mm

Adjustment
17
1.15 Position of the control cam
Requirement
1. The markings on control cam 1and arm shaft 3should correspond with each other.
2. The outer edge of control cam 1should be at a distance of 32.5mm from the metal
surface of the case.
●Turn control cam 1(screw 2) in accordance with requirement 1, or move it in accordance
with requirement 2.
Fig. 1 - 11
1
2
32,5 mm
3

Adjustment
18
Fig. 1 - 12
1.16 Position of the control roller
Requirement
When the needle bar is at its b.d.c., the control roller should be centred to the running
path of control cam 2.
●Turn screw 3(nut 4) in accordance with the requirement.
●For checking purposes, operate lever 1by hand to let the control roller fall into the
running path of control cam 2.
2
1
3
4

Adjustment
19
Fig. 1 - 13
1.17 Position of the drive shaft of the thread trimmer
Requirement
When the thread trimmer is in its basic position, shaft 1should be flush with the metal
edge of the machine case.
●Move shaft 1(screws 2and 3) in accordance with the requirement.
123

Adjustment
20
Fig. 1 - 14
1.18 Aligning the stop plate
Requirement
When the thread trimmer is in its basic position, there should be a clearance of 0.3mm
between lever 3and plate 1.
●Move plate 1 (screws 2) in accordance with the requirement.
13
2
0,3 mm