Pfaff Industrial 5626-840 Series Guide

296-12-19 346/001
adjustment Manual engl. 08.16
This instruction manual applies to machines
from the serial number 2814 691 and
software version 0435/002.
ADJUSTMENT MANUAL
3719-1/..
5626-840/..

Reprinting, reproduction and/or translation of PFAFF instruction manuals (including parts
thereof) is only permitted with our prior agreement and citation of the source.
PFAFF Industriesysteme
und Maschinen GmbH
Hans-Geiger-Str. 12 - IG Nord
D-67661 Kaiserslautern

Table of Contents
Contents ..................................................................................Page
13 Adjustment ........................................................................................................................... 4
13.01 Notes on adjustment ............................................................................................................. 4
13.02 Tools, gauges and other accessories .................................................................................... 4
13.03 Abbreviations ......................................................................................................................... 4
13.04 Explanation of symbols.......................................................................................................... 4
13.05 Adjusting basic machine ........................................................................................................ 5
13.05.01 Needle height (pre-calibrating) ............................................................................................... 5
13.05.02 Feed lifting eccentric ............................................................................................................. 6
13.05.03 Spreader driving eccentric ..................................................................................................... 7
13.05.04 Feed driving eccentric and drive for needle bar frame .......................................................... 8
13.05.05 Feed dog position .................................................................................................................. 9
13.05.06 Feed dog height................................................................................................................... 10
13.05.07 Needle position to needle hole ............................................................................................ 11
13.05.08 Hook position crossways to sewing direction ..................................................................... 12
13.05.09 Readjusting hook position in sewing direction / hook eccentric .......................................... 13
13.05.10 Readjusting needle height and adjusting needle bar stroke ................................................ 14
13.05.11 Spreader position in sewing direction.................................................................................. 15
13.05.12 Spreader position crossways to sewing direction ............................................................... 16
13
13
.05.13 Needle guard and thread-loop support
.05.13 Needle guard and thread-loop support
................................................................................
................................................................................
17
17
13
13
.05.14 Compensation weight
.05.14 Compensation weight
..........................................................................................................
.......................................................................................................... 18
13.05.15 Feed difference.................................................................................................................... 19
13.05.16 Top feed lift.......................................................................................................................... 20
13.05.17 Stroke limit of top feed ........................................................................................................ 21
13.05.18 Vibrating presser stroke movement .................................................................................... 22
13.05.19 Clearance between presser foot and needle plate................................................................ 23
13.05.20 Needle thread regulation and take-up lever guard....................................................................24
13.05.21 Looper thread regulation...........................................................................................................25
13.05.22 Stitch length limitation ..............................................................................................................26
13.06 Parameter settings .............................................................................................................. 27
13.07 Internet update of control P40 CD....................................................................................... 27
14 Circuit Diagrams ................................................................................................................ 28

Adjustment
4
13 Adjustment
Observe and comply with all instructions in the operating manual's chapter
1Safety! In particular make sure that all safety covers are installed again
correctly after making adjustments, see chapter 1.06 Operating manual
hazard information!
Unless otherwise stated, the machine must be disconnected from the mains
before all adjustment work!
Risk of injury due to accidental machine start-up!
13.01 Notes on adjustment
All adjustments in this manual are based on a fully assembled machine and may only be
carried out by technical staff trained for this purpose. Machine covers, which have to be
removed and replaced to carry out checks and adjustments, are not mentioned in the text.
The order of the following chapters corresponds to the most logical work sequence for
machines that have to be completely adjusted. Both the preceding and following chapters
must be observed if only specific individual work steps are carried out. The screws and nuts
indicated in brackets ( ) are fastenings for machine parts, which must be loosened before
any adjustment and tightened again afterwards.
13.02 Tools, gauges and other accessories
1set of screwdrivers with knife widths of 2 to 10 mm
1set of wrenches with jaw widths from 6to 22 mm
1set of Allen keys of 1.5to 6mm
1metal ruler (order no. 08-880 218-00
Needle rise gauge (order no. 61-111 600-01)
Screw clamp (order no. 61-111 600-35)
1gauge for the 2.0mm vibrating presser stroke (order no. 61-111 633-59
1gauge for the 4.0mm vibrating presser stroke (order no. 61-111 633-63
Needles, system (62-57)
Thread and testing material
13.03 Abbreviations
t.d.c. = top dead centre
b.d.c. = bottom dead centre
13.04 Explanation of symbols
Activities to be performed or important information in this adjustment manual are
emphasised by symbols. The symbols used have the following meaning:
Note, information
Maintenance, repairs, adjustment, service work
(only to be carried out by technical staff)

Adjustment
5
13.05 Adjusting basic machine
13.05.01 Needle height (pre-calibrating)
Rule
When the needle bar is at t.d.c., the clearance between the needle point and needle
plate should be approx. 12 mm with a needle bar stroke of 36 mm.
Adjust the needle bar 1(screw 2) without twisting according to the rule.
Fig. 13 - 01
2
1
12 mm

Adjustment
6
13.05.02 Feed lifting eccentric
Rule
When the needle bar is in b.d.c., the groove 3should be positioned vertically above the
shaft 4.
Turn the eccentric 1(screws 2) according to the rule.
Fig. 13 - 02
2
1
3
4

Adjustment
7
13.05.03 Spreader driving eccentric
Rule
1. When the needle bar is in b.d.c., the groove 5of the eccentric 1should be positioned
vertically above the shaft 3.
2. The spreader holder 4should move 6mm.
Turn the eccentric 1(screws 2) according to rule 1or adjust according to rule 2.
Fig. 13 - 03
1
2
3
5
3
4
6 mm

Adjustment
8
13.05.04 Feed driving eccentric and drive to needle bar frame
Rule
When the needle bar is in b.d.c., the groove 7of the eccentric 1
1. should be positioned vertically above the shaft 5and
2. the crank 3should be positioned vertically to the shaft 6
Turn the eccentric 1(screws 2) according to rule 1.
Turn the crank 3(screw 4) according to rule 2.
Fig. 13 - 04
1
2
3
6
4
7
5

Adjustment
9
13.05.05 Feed dog position
Rule
The feed dog 4should move laterally and longitudinally in the centre of the needle plate
cutout at maximum stitch length.
Align the attachment 1(screws 2and 3) according to the rule.
Fig. 13 - 05
1
2
3
4
=
=

Adjustment
10
13.05.06 Feed dog height
Rule
When the needle bar is in b.d.c. and with maximum stitch length regulation, the front
teeth of the feed dog 2 should be positioned 1.1 mm above the needle plate.
Loosen the screw 1.
Place the feed dog 2in parallel.
Tighten the screw 1.
Loosen the screw 3
Adjust the feed bar 4according to the rule
Tighten the screw 3.
Loosen the nut 5on the stop screw 6.
Screw in the stop screw 6up to the stop and secure it with the nut 5.
Fig. 13 - 06
2
1.1 mm
1
3
4
2
6
5

Adjustment
11
Fig. 13 - 07
13.05.07 Needle position to needle hole
Rule
1. The needle should pierce the middle of the needle hole crossways to the sewing
direction.
2. When the needle bar is in b.d.c., there should be a clearance of 0.8mm between
the needle and the front edge of the needle hole.
Align the needle bar frame (screws 1, 2and 3) according to rule 1.
Adjust the needle bar (screw 3) according to rule 2.
12
0.8 mm
3

Adjustment
12
Fig. 13 - 08
13.05.08 Hook position crossways to sewing direction
Rule
The hooks 1should be parallel to the needle plate cutout.
1. If the hook points are at the needle midpoint,
2. there should be a clearance of 0.1mm between the hook point and the needle.
Set the hook point at the needle midpoint by turning the handwheel.
Align the hook 1(screws 2) according to rule 1.
Align the bracket 3(screws 4) according to rule 2.
2
1
3
4
1
0.1 mm

Adjustment
13
13.05.09 Readjusting hook position to sewing direction(needle bar rise) / hook eccentric
Rule
When the needle bar is positioned 5.0mm after b.d.c. and stitch length regulation is
4.5mm, the hook point should be at the needle midpoint.
Adjusting the maximum stitch length
Move the needle bar to a position 6.0mm after b.d.c. by turning the handwheel.
Secure the c-clamp to the needle bar in this position so that the upward movement of
the needle bar is blocked.
Adjust the bracket 1(screw 2) according to the rule.
Checking the hook driving eccentric
Turn the handwheel against the direction of rotation until the c-clamp lays flat again.
Measure the clearance between the hook point and the edge of the needle - the clear-
ance should correspond to the needle size
In the event that this differs, turn the handwheel in the direction of rotation until the
c-clamp lays flat again and make the following adjustment:
Measured value is larger than the needle size, turn the eccentric 3(screw 4) so that the
hook moves to the left by half the value of the measured difference.
Measured value is smaller than the needle size, turn the eccentric 3(screw 4) so that the
hook moves to the right by half the value of the measured difference.
Restore the setting indicated in the rule after a correction has been made to the
eccentric 3.
Maintain stitch length regulation for the next setting.
Fig. 13 - 09
12
4
3

Adjustment
14
Fig. 13 - 10
13.05.10 Readjusting needle height and adjusting needle bar stroke
Rule
If the hook point aligns with the front of the needle at maximum stitch length coming
from behind, the lower edge of the hook should be positioned 1.5– 2mm above the
needle eye.
Adjust the needle bar 1(screw 2) according to the rule.
Check the hook position in the sewing direction, see chapter 13.05.09 Hook position in
sewing direction.
Adjusting the needle bar stroke:
Position the needle bar 1at b.d.c. for a standard needle gauge.
Turn the eccentric 3max. downwards.
Position the needle bar 1at b.d.c. for a 3.2mm needle gauge.
Turn the eccentric 3min. upwards.
2
1
1.5 - 2 mm
3

Adjustment
15
Fig. 13 - 11
13.05.11 Spreader position in sewing direction
Rule
1. The spreader tip should be inclined approx. 45° downwards and be 11 mm away
from the spreader holder.
2. The clearance between the tip of spreader 1and the needle should be 4mm with
maximum stitch length regulation and the needle bar positioned in b.d.c.
Adjust the spreader 1(screws 2) according to rule 1.
Adjust the bracket 3(screw 4) according to rule 2.
1
23
4
1
45°
4 mm
11 mm
1

Adjustment
16
Fig. 13 - 12
13.05.12 Spreader position crossways to sewing direction
Rule
1. The tips of the spreader 1 should be 0.1 mm away from the hook at the side.
2. The tips of the spreader 1should be positioned 0.1mm above the back of the hook.
Place the hook eye next to the tips of the spreader 1by turning the handwheel.
Align the bracket 2(screws 3) according to rule 1.
Turn the handwheel until the tips of the spreader 1are positioned above the back of
the hook.
Adjust the bracket 2(screw 4) according to rule 2.
2
1
3
0.1 mm
4
0.1 mm
1
0.1 mm

Adjustment
17
Fig. 13 - 13
13.05.13 Needle guard and thread-loop support
Rule
If the hook point is positioned at the needle midpoint coming from behind, the guard 1
should rest gently on the needle and the lower edge of it should be positioned 0.5mm
above the needle point.
Align the guard 1(screws 2) according to rule 1.
1
2
0.5 mm

Adjustment
18
13.05.14 Compensation weight
Rule
When the needle bar is in t.d.c., the largest eccentricity of the compensation weight 1
should be in the bottom position.
Turn the compensation weight 1(screw 2) according to the rule.
Fig. 13 - 14
2
1
1
2

Adjustment
19
13.05.15 Feed difference
Rule
The needle and bottom transporter should feed in the same way with maximum stitch
length regulation and when turning the handwheel.
Adjust the connecting rod 1(nut 2) according to the rule.
Connecting rod by " +" = larger needle feed or
by " -" = smaller needle feed.
Fig. 13 - 15 1
2
1
+-

Adjustment
20
Fig. 13 - 16
13.05.16 Top feed lift
Rule
1. The vibrating presser 10 and presser foot 11 should each lift off 5.0 mm when
the setting wheel 1is in position "5".
2. The standard stroke should be limited to 5mm.
Remove the bottom feed and needle and position the setting wheel 1on "0".
Screw on the needle plate, lay the metal ruler over the opening of the needle plate cutout
so that both presser feet can fit onto the metal ruler.
Screw in the stop screw 2completely.
To pre-adjust the crank 3(screw 4), make an adjustment so that the crank 5does not move
when turning the handwheel.
Position the setting wheel 1to "5".
To readjust the ball stud 6(lock nut 7), turn according to rule 1.
Adjust the crank 8(screw 9) so that the vibrating presser 10 and presser foot 11 lift
evenly off the needle plate.
Check rule 1and adjust the ball stud 6(nut 7) if necessary.
Turn the stop screw 2according to rule 2.
1
2
10
7
6
5 mm
5 mm
11
9
8
3
5
4
5 mm