Pfaff POWERLINE 2571 ME PLUS User manual

This service manual applies to machines
from software version 0389/001 and serial
number 2 766 760 onwards
296-12-19 129/002
Justieranleitung dtsch. 01.11
SERVICE MANUAL
2571 ME PLUS / PREMIUM
2574 ME PLUS / PREMIUM
2591
ME PLUS / PREMIUM

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 ........................................................................................................................... 5
1.01 Notes on adjustment ............................................................................................................. 5
1.02 Tools, gauges and other accessories for adjusting ............................................................... 5
1.03 Abbreviations ......................................................................................................................... 5
1.04 Explanation of the symbols.................................................................................................... 5
1.05 Adjusting the basic machine .................................................................................................. 6
1.05.01 Basic position of the balance wheel (adjustment aid)............................................................ 6
1.05.02 Balance weight ...................................................................................................................... 7
1.05.03 Needle position in the direction of sewing (on the 2571 ME and 2591 ME) ......................... 8
1.05.04 Needle position in the direction of sewing (on the 2574 ME) ................................................ 9
1.05.05 Limiting the needle bar frame (not applicable for 2574 ME) ................................................ 10
1.05.06 Preliminary adjustment of the needle height....................................................................... 11
1.05.07 Needle rise, hook clearance, needle height and needle guard (on the PFAFF 2571 ME) ........... 12
1.05.08 Needle rise, hook clearance, needle height and needle guard (on the PFAFF 2574 ME )........... 14
1.05.09 Needle rise, Gripper distance, Needle height and Needle guard (on the PFAFF 2591 ME)..........16
1.05.10 Needle position crosswise to sewing direction (on the PFAFF 2571 ME) ........................... 18
1.05.11 Needle position crosswise to sewing direction (on the PFAFF 2574) .................................. 19
1.05.12 Needle position crosswise to sewing direction (on the PFAFF 2591 ME) ........................... 20
1.05.13 Height and stroke of the bobbin case opener...................................................................... 21
1.05.14 Height of the feed wheel (on the 2571 ME) ........................................................................ 22
1.05.15 Height of the feed wheel (on the 2574) ............................................................................... 23
1.05.16 Height of the feed wheel (on the 2591)............................................................................... 24
1.05.17 Roller-presser ....................................................................................................................... 25
1.05.18 Clearance between roller presser and feed wheel .............................................................. 26
1.05.19 Knee lever ............................................................................................................................ 27
1.05.20 Tension release .................................................................................................................... 28
1.05.21 Thread check spring and thread regulator ............................................................................ 29
1.05.22 Bobbin winder...................................................................................................................... 30
1.05.23 Sewing foot pressure........................................................................................................... 31
1.05.24 Lubrication ........................................................................................................................... 32
1.05.25 Re-engaging the slip-clutch .................................................................................................. 33
1.06 Adjusting the edge trimmer -725/04.................................................................................... 34
1.06.01 Position of the knife holder on model 2571 ......................................................................... 34
1.06.02 Position of the knife holder on model 2591 ......................................................................... 35
1.06.03 Knife stroke on model 2571 ME .......................................................................................... 36
1.06.04 Knife stroke on model 2591 ME .......................................................................................... 37
1.06.05 Cutting stroke on model 2571 ME....................................................................................... 38
1.06.06 Cutting stroke on model 2591 ME....................................................................................... 39

Index
Contents ................................................................................Page
1.06.07 Knife position ....................................................................................................................... 40
1.07 Adjusting the thread trimmer -900/81.................................................................................. 41
1.07.01 Resting position of the roller lever / radial position of the control cam................................ 41
1.07.02 Position of the thread catcher holder ...................................................................................42
1.07.03 Distance between thread catcher and needle plate ............................................................ 43
1.07.04 Position of the thread catcher .............................................................................................. 44
1.07.05 Knife position and knife pressure......................................................................................... 45
1.07.06 Bobbin thread retaining spring............................................................................................. 46
1.07.07 Manual cutting test .............................................................................................................. 47
1.07.08 Linkage rod (only for the PFAFF 2574 ME)........................................................................... 48
1.08 List of parameters for control P320 / P321....................................................................... 49
1.09 Error Messages and Description.......................................................................................... 54
1.10 Motor Errors......................................................................................................................... 55
1.11 Updating the machine software via internet ........................................................................ 56
1.11.01 Updating 2500 ME PLUS (with null modem cable) ............................................................ 56
1.11.02 Updating 2500 PREMIUM (with SD card)............................................................................ 57
2 Circuit diagrams................................................................................................................. 59

Adjustment
5
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
●Setting gauge (Needle position in sewing direction Order No. 61-111 641-48)
●Step gauge
●Metal rule (part No. 08-880 218-00)
●Sewing thread and test materials
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
6
Fig. 1 - 01
1
2
2
127-01
1.05 Adjusting the basic machine
1.05.01 Basic position of the balance wheel (adjustment aid)
Requirement
When the needle bar is positioned at t.d.c., the marking "0" on the scale should be level
with the top edge of the belt guard (see arrow).
Adjust the scale dial 1(four screws 2) in accordance with the requirement.

Adjustment
7
Fig. 1 - 02
1
2
1
2
1.05.02 Balance weight
Requirement
When the needle bar is positioned at b.d.c. (balance wheel position 180°) the largest ec-
centricity of the balance weight 1should be at the top.
●Adjust balance weight 1(screw 2) in accordance with the requirement.

Adjustment
8
1.05.03 Needle position in the direction of sewing (on the 2571 ME and 2591 ME)
Requirement
With the stitch length set at "5", in its front and rear point of reversal the needle should be
the same distance from the inside edges of the needle hole.
●Turn on machine and set stitch length to "5".
●Turn machine off and on (synchronise needle bar to stitch length).
●Sew a stitch and check the rear position of the needle according to the requirement.
●Press the stitch control key, sew a stitch and check the forward position of the needle ac-
cording to the requirement and where necessary make the following adjustments.
●Turn off machine and loosen screws 1, 2and 3.
●Push the adjusting pin's angled part (Order No. 61-111Snnb641-48 through hole 4
and 5into the hole 6of the bearing block 7.
●Move the needle bar frame 8according to the requirement and tighten screw 1.
●Check according to the requirement.
●Screws 2and 3remain loosened for the subsequent adjustment.
Fig. 1 - 03
4
5
2
8
=
=
1
3
6
7

Adjustment
9
1.05.04 Needle position in the direction of sewing (on the 2574 ME)
Requirement
The needle must penetrate the middle of the needle hole as viewed in the direction of
sewing.
2
1
●Move the needle bar frame 1( screws 2, 3and 4) in accordance with the requirement.
Fig. 1 - 04
4
3

Adjustment
10
1.05.05 Limiting the needle bar frame (Not applicable for PFAFF 2574 ME.)
Requirement
With the stitch length set at "5", when the needle is in its front and rear point of reversal
screw 4should be the same distance from the inside edge of its hole.
●Set stitch length to "5".
●Select parameter 605.
●Turn the handwheel in the direction of rotation and check the "requirement".
●If necessary move regulating bow 1(screw 2and 3).
Fig. 1 - 05
4
2
1
4
=
=
3

Adjustment
11
Requirement
When the needle bar is positioned at t.d.c. (handwheel position 0°) there should be a
gap between upper edge needle bar and upper edge needle pendulum of about 54 mm
(2571/91)or 58 mm. (2574)
Fig. 1 - 06
1.05.06 Preliminary adjustment of the needle height
●Without turning it, re-position needle bar 1(screw 2) in accordance with the
requirement.
2
1
54 mm (2571 /91
58 mm (2574)

Adjustment
12
1.05.07 Needle rise, hook clearance, needle height and needle guard (on the PFAFF 2571 ME)
Requirement
With the needle bar positioned 2.0 mm after BDC (balance wheel position 202°) and the
stitch length set at "0.8"
1. the hook point must be at needle centre with a hook-to-needle clearance of 0.05 to 0.1 mm;
2. the top of the needle eye must be 0.8to 1.0 mm below the hook point;
3. the needle guard 7must touch the needle lightly.
Fig. 1 - 07
4
5
5
12
7
0,8 - 1 mm
10
3
2
1
8
6
9
11

Adjustment
13
●Set stitch length at "0.8".
●Loosen screws 1, 2, 3, 4and 5.
●Select parameter 605.
●Unscrew the needle plate.
●Turn the handwheel four times in the direction of rotation.
●Bring the handwheel into position 202° (= needle bar position 2.0mm after b.d.c.)
●Set the hook point on the middle of the needle. Take care that the needle is not
squeezed by needle guard 7.
●Adjust the needle height according to requirement 2, cf. chapter 1.05.05 Preliminary Ad-
justment of Needle Height.
●Move hook post according to requirement 1and tighten screws 4and 5.
●Move collar 8into contact and tighten screw 1.
●Move collar 9into contact and tighten screw 6
●Tighten screws 3allowing for bevel gear wheel movement.
●Move collar 10 up against bevel gear wheel 11 and tighten screws 2
●Adjust needle guard 7(screw 12) according to rule 3.
When changing a clamp take care that the
markings 13 and 14 are on one side.
13
14

Adjustment
14
1.05.08 Needle rise, hook clearance, needle height and needle guard (on the PFAFF 2574 ME )
Requirement
With the needle bar positioned 2.0 mm after BDC on both hook (balance wheel position
202°) and the stitch length set at "0.8"
1. the hook point must be at needle centre with a hook-to-needle clearance of 0.05 to 0.1 mm;
2. the top of the needle eye must be 0.8to 1.0 mm below the hook point;
3. the needle guard 9must touch the needle lightly.
●Loosen screws 1, 2, 3, 4, 5, 6and 7.
●Loosen screws 8slightly.
●Select parameter 605.
Fig. 1 - 08
3
456
8
12
12
10 11 13
7
7
8
14
9
0,8 - 1 mm

Adjustment
15
●Unscrew the needle plate.
●Turn the handwheel four times in the direction of rotation.
●Bring the handwheel into position 202° (= needle bar position 2.0mm after b.d.c.)
●Set both hook points to the centre of the needle, taking care to see that the needles are
not deflected by needle guard 9.
●Set the needle height in accordance with requirement 2, compare Chapter 1.05.05 Pre-
adjusting the needle height.
●Adjust both hook posts in accordance with requirement 1and tighten screws 8.
●Tighten screws 1and 6.
●Taking the play of the bevel gear into consideration, tighten screws 3and 5.
●Move adjustment ring 10 against bevel gear 12 and tighten screws 2.
●Move adjustment ring 12 against bevel gear 13 and tighten screws 4.
●Tighten screws 7on both sides of the post.
●Adjust needle guard 9(screw 14) on both hooks in accordance with requirement 3.
When the hook is changed, make sure that markings 15 and
16 are on one side.
15
16

Adjustment
16
1.05.09 Needle rise, Gripper distance, Needle height and Needle guard (on the PFAFF 2591 ME)
Requirement
With the needle bar positioned 2.0 mm after BDC (balance wheel position 202°) and the
stitch length set at "0.8"
1. the hook point must be at needle centre with a hook-to-needle clearance of 0.05 to 0.1 mm;
2. the top of the needle eye must be 0.8to 1.0 mm below the hook point;
3. the needle guard 6must touch the needle lightly.
●Set stitch length at "0.8".
●Loosen screws 1, 2, 3, and 4as well as screw 5on both sides of the post.
●Select parameter 605.
●Unscrew the needle plate.
●Turn the handwheel four times in the direction of rotation.
●Bring the handwheel into position 202° (= needle bar position 2.0mm after b.d.c.)
●Set the hook point on the middle of the needle. Take care that the needle is not
squeezed by needle guard 6.
●Adjust the needle height according to requirement 2, cf. chapter 1.05.05 Preliminary Ad-
justment of Needle Height.
●Move hook post according to requirement 1and tighten screws 4.
Fig. 1 - 08
4
5
4
6
9
0,8 - 1 mm
123
7
8

Adjustment
17
●Tighten screws 2allowing for bevel gear wheel movement.
●Move collar 7up against bevel gear wheel 8and tighten screws 1.
●Screws 5remain loosened for further adjustments.
●Adjust needle guard 6(screw 9) according to requirement 3.
When changing a clamp take care that the
markings 10 and 11 are on one side.
10
11

Adjustment
18
1.05.10 Needle position crosswise to sewing direction (on the PFAFF 2571 ME)
Requirement
As seen crosswise to the sewing direction, the needle must penetrate in the centre of
the needle hole.
●Turn screws 1(screws 2, on both sides of the post) according to the requirement.
Ensure that support plate 3is parallel to hook post 4.
Fig. 1 - 10
1
2
2
2
2
3
4

Adjustment
19
Fig. 1 -10
1.05.11 Needle position crosswise to sewing direction (on the PFAFF 2574)
Requirement
As seen crosswise to the sewing direction, the needles must penetrate in the centre of
the needle holes.
●Shift bearing plate 1(screws 2, on both sides of the post) according to the requirement.
1
2
2
2

Adjustment
20
1.05.12 Needle position crosswise to sewing direction (on the PFAFF 2591 ME)
Requirement
As seen crosswise to the sewing direction, the needle must penetrate in the centre of
the needle hole.
●Adjust feed wheel post 1(screws 2, 3and 4) according to the requirement.
Fig. 1 - 11
1
2
4
4
4
4
3