Pfaff 910 Series User manual
-900/51
296-12-18210
Justieranleitung engl.11.98
Service Manual
for the series
910 and 930
At the time of printing, all information and illustrations contained in this document were up
to date.
Subject to alteration!
The reprinting, copying or translation of PFAFF Service Manuals, whether in whole or in
part, is only permitted with our previous agreement and with written reference to the
source.
G.M. PFAFF
Aktiengesellschaft
Postfach 3020
D-67653 Kaiserslautern
Königstr. 154
D-67655 Kaiserslautern
Editing / Illustration
PFAFF
Abtlg. TES
Table of Contents
Contents...............................................................................Chapter - Page
1Safety ........................................................................................................................ 1 -1
1.01 General notes on safety............................................................................................. 1-1
1.02 Safety symbols .......................................................................................................... 1 - 2
1.03 Danger .......................................................................................................................1- 2
2Adjustment ............................................................................................................... 2 - 1
2.01 Notes on adjusting ..................................................................................................... 2 - 1
2.02 Tools, gauges and other accessories ......................................................................... 2 - 1
2.03 Abbreviations ............................................................................................................. 2 - 1
2.04 Work symbols ............................................................................................................ 2 - 1
2.05 Check and adjustment aid.......................................................................................... 2 - 2
2.06 Pre-adjusting the control cam .................................................................................... 2 - 3
2.07 Roller lever.................................................................................................................2- 4
2.08 Pawl ........................................................................................................................... 2 - 5
2.09 Engaging solenoid...................................................................................................... 2 - 6
2.10 Release lever ............................................................................................................. 2 - 7
2.11 Engaging lever ........................................................................................................... 2 - 8
2.12 Thread catcher position and cutting test.................................................................... 2 - 9
2.13 Control cam (final adjustment) and retaining spring ................................................... 2 -10
2.14 Needle thread tension release ................................................................................... 2 -11
2.15 Removing and refitting control unit............................................................................ 2 -13
2.16 Synchronizer .............................................................................................................. 2 -14
Safety
1 Safety
1.01 General notes on safety
●This machine must only be operated by adequately trained operators and only after
having completely read and understood the Instruction Manual!
●All Notes on Safety and Instruction Manuals of the motor manufacturer are to be read
before operating the machine!
●The Danger and Safety Instructions on the machine itself are to be followed!
●The machine must be used only for the purpose for which it is intended and must not
be operated without its safety devices. Observe all relevant safety regulations!
●When exchanging sewing tools (e.g. needle, presser foot, needle plate, feed dog and
bobbin), when threading, when the workplace is left unattended and during servicing,
the machine must be disconnected from the mains by switching off the on/off switch
or by removing the plug from the mains!
●Daily servicing work must be carried out only by appropriately trained persons!
●Repairs and special maintenance work must only be carried out by technicians or
persons with appropriate training!
●For service or repair work on pneumatic systems the machine must be disconnected
from the compressed air supply. The only exceptions to this are adjustments and
function checks made by appropriately trained personnel!
●Work on the electrical equipment must be carried out only by electricians or
appropriately trained personnel!
●Work is not permitted on parts and equipment which are connected to the power
supply! Exceptions to this are contained in the regulations EN 50110!
●Modifications and alterations to the machine must only be carried out under
observance of all the relevant safety regulations!
●Only spare parts which have been approved by us are to be used for repairs! We
expressly point out that any replacement parts or accessories which are not supplied
by us have not been tested and approved by us. The installation and/or use of any such
products can lead to negative changes in the structural characteristics of the machine.
We shall not be liable for any damage which may be caused by non-original parts!
1 - 1
Safety
1.02 Safety symbols
Danger!
Points to be observed.
Danger of injury to operating and specialist personnel!
1.03 Danger
Do not reach into the sewing area while sewing!
Danger of injury caused by needle!
Do not leave any objects on the table or near the needle plate while carrying
out adjusting work. Objects can become jammed or be slung away! Danger of
injury!
In order to adjust this device, the machine must be tilted to the back.
Use both hands when returning the machine to an upright position!
Danger of crushing between sewing head and table top!
1 - 2
Adjustment
2 - 1
2 Adjustment
On the PFAFF 918, 937, 938 and 939 no c-clamps may be attached to the
needle bar as this would damage the special coating on the needle bar.
2.01 Notes on adjusting
All adjustments in these adjustment instructions are based on a completely assembled
machine and must only be carried out by trained specialists. Covers on the machine which
have to be removed and replaced for checks and adjustment work are not mentioned.
2.02 Tools, gauges and other accessories
●Screwdrivers with blade width from 2 to 10 mm
●Wrenches (spanners) with jaw width from 7 to 14 mm
●Allan keys from 1.5 to 6 mm
●Metal rule, Part No. 08-880 218-00
●Blocking pin (5 mm diameter), Part No. 13-030 341-05
●Sewing thread and test material
2.03 Abbreviations
tdc = top dead center
bdc = bottom dead center
2.04 Work symbols
Note, information
Servicing, repair, adjustment, maintenance
Adjustment
2 - 2
2.05 Check and adjustment aid
By blocking with holes 1- 4the required needle bar positions can be fixed
exactly.
●Turn the balance wheel until the needle bar has approximately reached the required
position.
●Place the 5 mm blocking pin in the appropriate hole and put pressure on it.
●Turn the balance wheel forwards and backwards a little until the blocking pin moves
into the slot in the crank behind the bearing plate, thus blocking the machine.
Hole 1 = 2.0 mm after the bottom dead center of the needle bar (2.0 past tdc)
Hole 2 = Top dead center of the needle bar (tdc)
Hole 3 = 0.25 mm after the top dead center of the needle bar (0.25 past bdc)
Hole 4 = 1.0 mm after the top dead center of the needle bar (1.0 mm past tdc)
Fig. 2 - 01
4
2
5
1
3
3
4
2
5
1
Adjustment
2 - 3
2.06 Pre-adjusting the control cam
24V = 4% ED
83
7-14-44
5
56
7
6
1
2
3
42
Fig. 2 - 02
●Unscrew screw 3and remove retaining spring 4together with the cover washer.
●Loosen screws 5and 6.
●Turn control cam 1in accordance with requirement 1and position it in accordance with
requirement 2.
●Tighten screws 5.
●Push retaining collar 7onto control cam 1and tighten screws 6.
1
Retaining spring 4 stays removed for the following adjustments.
Requirement
With the needle bar at tdc (hole 2):
1. the beginning of the highest point of the lobe of control cam 1must be underneath the
point of pawl 2,
2. the right hand side of the lobe must be flush with pawl 2.
Adjustment
2 - 4
Requirement
With the needle bar 2.0 past bdc (hole 1):
1. the roller of roller lever 1must fall lightly into control cam 2when roller lever 1is lightly
tapped
2.07 Roller lever
●Loosen screws 3and 4.
●Put pressure on rock shaft 5to the right.
●Move roller lever 1in accordance with the requirement.
●Tighten screw 3.
●Loosen screw 6and position the flat of retaining collar 7parallel to the bedplate.
●Tighten screw 6.
24V = 4% ED
3
7-14-45
2
1
6
3
4
5
1
2
7
Fig. 2 - 03
Screw 4remains unscrewed for further adjustments.
Adjustment
2 - 5
2.08 Pawl
Requirement
With the thread trimmer in resting position there must be a clearance of 0.3 mm between
pawl 1and the largest eccentricity of the lobe on control cam 2.
24V = 4% ED
3
7-14-46
Fig. 2 - 04
12
23
1
0.3 mm
34
●Position the largest eccentricity of the lobe on control cam 2underneath pawl 1.
●Loosen screw 4.
●Position pin 3in accordance with the requirement.
●Tighten screw 4.
This manual suits for next models
1
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