Pfaff 337 User manual

INSTRUCTION MANUAL
296-12-18 643/002
Betriebsanleitung engl. 06.09
This instruction manual applies to machines from the
following serial numbers onwards:
# 7 207 686
337

This Instruction Manual is valid for all models and subclasses listed in the
chapter "Specifications ".
The adjustment manual for the machines can be downloaded free of charge
from the internet address
www.pfaff-industrial.com/pfaff/de/service/downloads
As an alternative to the internet download the adjustment manual can also be
ordered in book form under part no. 296-12-18 644/002.
The reprinting, copying or translation of PFAFF Instruction 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
1Safety .................................................................................................................................... 5
1.01 Directives...............................................................................................................................5
1.02 General notes on safety......................................................................................................... 5
1.03 Safety symbols ...................................................................................................................... 6
1.04 Important points for the user................................................................................................. 6
1.05 Operating and specialist personnel........................................................................................ 7
1.05.01 Operating personnel .............................................................................................................. 7
1.05.02 Specialist personnel............................................................................................................... 7
1.06 Danger warnings.................................................................................................................... 8
2Proper use ............................................................................................................................ 9
3Specifications ..................................................................................................................... 10
3.01 PFAFF 337............................................................................................................................ 10
3.02 Possible versions and subclasses ........................................................................................ 10
4Disposal of Machine .......................................................................................................... 11
5Transportation, packing and storage................................................................................ 12
5.01 Transportation to customer‘s premises ............................................................................... 12
5.02 Transportation inside the customer‘s premises................................................................... 12
5.03 Disposal of packing materials ..............................................................................................12
5.04 Storage ................................................................................................................................ 12
6Explanation of symbols..................................................................................................... 13
7Controls .............................................................................................................................. 14
7.01 On/off switch ....................................................................................................................... 14
7.02 Pedale ................................................................................................................................. 14
7.03 Lever for lifting the presser foot .......................................................................................... 15
7.04 Stitch-length adjustment lever / reverse sewing.................................................................. 15
7.05 Top feed stroke limitation..................................................................................................... 16
7.06 Visual indicator -921/01 (optional)......................................................................................... 16
7.07 Adjustment nut for the top-feed stroke ............................................................................... 17
7.08 Control panel (only on machines with Quick EcoDrive) ....................................................... 17
8Installation and commissioning ....................................................................................... 18
8.01 Installation............................................................................................................................ 18
8.01.01 Adjusting the table-top height.............................................................................................. 18
8.01.02 Assembling the motor (only on machines with Quick-motor).............................................. 19
8.01.03 Tightening the V-belt ............................................................................................................ 19
8.01.04 Mounting the bottom V-belt guard ....................................................................................... 20
8.01.05 Fitting the upper belt guard.................................................................................................. 20
8.01.06 Fitting the synchronizer........................................................................................................ 21
8.01.07 Fitting the reel stand ............................................................................................................ 21

Index
Contents ..................................................................................Page
8.02 Connecting the plug-in connections and earth cables ......................................................... 22
8.03 Commissioning .................................................................................................................... 24
8.04 Switching the machine on/off ..............................................................................................24
8.05 Basic position of the machine drive unit .............................................................................. 25
9Setting up ........................................................................................................................... 26
9.01 Inserting the needle ............................................................................................................ 26
9.02 Winding the bobbin thread, adjusting the thread tension.................................................... 27
9.03 Removing / Inserting the bobbin case ................................................................................. 28
9.04 Threading the bobbin thread and regulating the bobbin thread tension .............................. 28
9.05 Threading needle thread/adjusting needle thread tension .......................................................29
9.06 Adjusting the stitch counter for the bobbin thread control ......................................................29
10 Care and maintenance....................................................................................................... 30
10.01 Care and maintenance intervals........................................................................................... 30
10.02 Cleaning ............................................................................................................................... 30
10.03 Oiling the sewing hook ........................................................................................................ 31
10.04 Oiling the needle-head parts................................................................................................ 31
10.05 General oiling ....................................................................................................................... 32
10.06 Lubricating the bevel gears.................................................................................................. 33
10.07 Lubricating the top-feed drive excentric............................................................................... 34
10.08 Checking/regulating the air pressure ................................................................................... 34
10.09 Emptying/cleaning the water bowl of the air filter/regulator................................................ 35
10.10 Parameter settings .............................................................................................................. 36
10.10.01 Parameter list....................................................................................................................... 36
11 Table top cutout and Circuit diagrams.................................................................................. 37
11.01 Table top cutout ................................................................................................................... 37
11.02 Mounting the table top ........................................................................................................ 37
11.03 Circuit diagrams ................................................................................................................... 38
12 Wearing parts ..................................................................................................................... 42

5
Safety
1 Safety
1.01 Directives
This machine is constructed in accordance with the European regulations contained in the
conformity and manufacturer’s declarations.
In addition to this Instruction Manual, also observe all generally accepted, statutory and
other regulations and legal requirements and all valid environmental protection regulations!
The regionally valid regulations of the social insurance society for occupational accidents or
other supervisory organizations are to be strictly adhered to!
1.02 General notes on safety
This machine may 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 be-
fore operating the machine!
The danger and safety instructions on the machine itself are to be followed!
This machine may only be used for the purpose for which it is intended and may not be
operated without its safety devices. All safety regulations relevant to its operation are to
be adhered to.
When exchanging sewing tools (e.g. needle, roller presser, needle plate and bobbin),
when threading the machine, when leaving the machine unattended and during mainte-
nance work, the machine is to be separated from the power supply by switching off the
On/Off switch or by removing the plug from the mains!
Everyday maintenance work is only to be carried out by appropriately trained personnel!
Repairs and special maintenance work may only be carried out by qualified service staff
or appropriately trained personnel!
Work on electrical equipment may only be carried out by appropriately trained personnel!
Work is not permitted on parts and equipment which are connected to the power supply!
The only exceptions to this rule are found in the regulations EN 50110.
Modifications and alterations to the machine may 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 express-
ly 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 are not liable
for any damage which may be caused by non-original parts.
●
●
●
●
●
●
●
●
●
●
●

6
Safety
1.03 Safety symbols
Danger!
Points to be observed..
Danger of injury for operating and specialist personnel!
Caution
Do not operate without finger guard and safety devices.
Before threading, changing bobbin and needle, cleaning
etc. switch off main switch.
I
1.04 Important points for the user
This Instruction Manual is an integral part of the machine and must be available to the
operating personnel at all times.
The Instruction Manual must be read before operating the machine for the first time.
The operating and specialist personnel is to be instructed as to the safety equipment of
the machine and regarding safe work methods.
It is the duty of the user to only operate the machine in perfect running order.
It is the obligation of the user to ensure that none of the safety mechanisms are removed
or deactivated.
It is the obligation of the user to ensure that only authorized persons operate and work
on the machine.
Further information can be obtained from your PFAFF agent.
●
●
●
●
●
●

7
Safety
1.05 Operating and specialist personnel
1.05.01 Operating personnel
Operating personnel are persons responsible for the equipping, operating and cleaning of
the machine as well as for taking care of problems arising in the sewing area.
The operating personnel is required to observe the following points and must:
always observe the Notes on Safety in the Instruction Manual!
never use any working methods which could adversely affect the safety of the machine!
not wear loose-fitting clothing or jewelery such as chains or rings!
also ensure that only authorized persons have access to the potentially dangerous area
around the machine!
always immediately report to the person responsible any changes in the machine which
may limit its safety!
1.05.02 Specialist personnel
Specialist personnel are persons with a specialist education in the fields of electrics, electro-
nics and mechanics. They are responsible for the lubrication, maintenance, repair and adjust-
ment of the machine.
The specialist personnel is obliged to observe the following points and must:
always observe the Notes on Safety in the Instruction Manual!
switch off the On/Off switch before carrying out adjustments or repairs, and ensure that
it cannot be switched on again unintentionally!
wait until the luminous diode on the control box is no longer blinking or on before begin-
ning adjustment or repair work.
never work on parts which are still connected to the power supply! Exceptions are explai-
ned in the regulations EN 50110.
replace the protective coverings and close the electrical control box afer all repairs or
maintenance work!
●
●
●
●
●
●
●
●
●
●

8
Safety
Do not run the machine without take-up lever guard 1!
Danger of injury by moving take-up lever!
Do not run the machine without belt guards 2 and 3!
Danger of injury by rotating v-belt!
Do not run the machine without finger guard 4!
Danger of injury by up and down movement of needle!
Do not run the machine without cylinder-bed cap 5!
Danger of injury by rotating hook!
1.06 Danger warnings
A working area of 1mmust be kept free both in front of and behind the machi-
ne, so that easy access is possible at all times.
Never put your hands or fingers in the sewing area during sewing!
Danger of injury by the needle!
While setting or adjusting the machine do not leave any objects on the table nor
in the needle plate area! Objects may be trapped or flung out of the machine!
Fig. 1 - 01
4
5
12
3

9
Proper use
2 Proper use
The PFAFF 337 is a single-needle lockstitch cylinder-bed sewing machine with drop feed and
variable top feed.
The machine is used for sewing sleeves into coats, costumes, jackets, etc., in the textile in-
dustry.
Any and all uses of this machine which have not been approved of by the
manufacturer are considered to be inappropriate! The manufacturer cannot be
held liable for any damage caused by the inappropriate use of the machine!
The appropriate use of the machine includes the observance of all operational,
adjustment, maintenance and repair measures required by the manufacturer!

Specifications
10
3 Specifications
3.01 PFAFF 337 ◆
Stitch type:......................................................................................................... 301 (lockstitch)
Machine model: ................................................................................................................ BN36
Needle system:............................................................................................................. 134 - 35
Needle size in 1/100 mm: ............................................................................................. 80 - 100
Max. thread size (synthetic):............................................................................................. 40/3▲
Max. stitch length on version N36 .......................................................................................... ➊
Effective dia. of balance wheel: .....................................................................................80 mm
Max. sewing speed*: ................................................................................................2100 min-1
Dimensions of the machine:
Cylinder-bed end dia.: .....................................................................................................51 mm
Cylinder-bed circumference: ........................................................................... approx. 165 mm
Length:............................................................................................................. approx. 770 mm
Breadth: ...........................................................................................................approx. 380 mm
Height (above table) ......................................................................................... approx. 630 mm
Clear workspace length: ...............................................................................................265 mm
Clear workspace height: ............................................................................................... 115 mm
Fabric clearance: ............................................................................................................. 11 mm
Net weight of sewing head:..................................................................................approx. 40 kg
Gross weight of sewing head : .............................................................................approx. 48 kg
Working air pressure:......................................................................................................... 6 bar
Air consumption:.....................................................................................~ 0.8 litres/work cycle
Mains voltage: ........................................................................ see instruction manual of motor
Noise data:
Noise emission level at workplace with a sewing speed of 1800 spm: ............ LpA < 77 dB(A)■
(Noise measurement in accordance with DIN 45 635-48-A-1, ISO 11204, ISO 3744, ISO )
➊= 3mm feed stroke of the bottom and 6 mm feed stroke of the top feed dog
◆Subject to technical alterations
* Depending on material and operation
▲Or comparable sizes of other thread types
■K
pA = 2,5 dB
3.02 Possible versions and subclasses
Version B:....................................................................................For sewing medium materials
Work aids:
Subclass -900/51.............................................................................................. Thread trimmer
Subclass -910/98..............................................................................Automatic presser foot lift
Subclass -921/01....................................................................................... Visual feed indicator

11
Disposal of Machine
4 Disposal of Machine
Proper disposal of the machine is the responsibility of the customer.
The materials used for the machine are steel, aluminium, brass and various plastic
materials. The electrical equipment comprises plastic materials and copper.
The machine is to be disposed of according to the locally valid pollution control regula-ti-
ons; if necessary, a specialist ist to be commissioned.
Care must be taken that parts soiled with lubricants are disposed of separately
according to the locally valid pollution control regulations!
●
●
●

Transportation, packing and storage
12
5 Transportation, packing and storage
5.01 Transportation to customer‘s premises
The machines are delivered completely packed.
5.02 Transportation inside the customer‘s premises
The manufacturer cannot be made liable for transportation inside the customer‘s premises
nor to other operating locations. It must be ensured that the machines are only transported
in an upright position.
5.03 Disposal of packing materials
The packing materials of this machine comprise paper, cardboard and VCE fibre. Proper dis-
posal of the packing material is the responsibility of the customer.
5.04 Storage
If the machine is not in use, it can be stored as it is for a period of up to six months, but It
should be protected against dust and moisture.
If the machine is stored for longer periods, the individual parts, especially the surfaces of
moving parts, must be protected against corrosion, e.g. by a film of oil.

Explanation of symbols
13
6 Explanation of symbols
In this instruction manual, work to be carried out or important information is accentuated by
symbols. These symbols have the following meanings:
Note, information
Cleaning, care
Lubrication
Maintenance, repairs, adjustment, service work
(only to be carried out by technical staff)

14
Controls
Fig. 7 - 01
7.02 Pedale
With the on/off switch on
0= Neutral position
+1= Sew
-1= Raise presser foot
(on machines with -910/98)
- 2= Trim thread
(on machines with thread
trimmer -900/51)
+1and = Increase stroke of top feed,
see Chapter 7.05 and 7.06).
●
Fig. 7 - 02
1
77-005
0
+ 1
+ 2
- 1 - 2
7 Controls
7.01 On/off switch
The power supply to the machine is swit-
ched on or off by turning switch 1.
The illustrated on/off switch is
fitted to machines with Quick
motors. If other motors are
used, a different switch may be
fitted.
●

15
Controls
Fig. 7 - 04
Fig. 7 - 03
1
7.03 Lever for lifting the presser foot
The sewing foot can be lifted by raising
lever 1.
●
7.04 Stitch-length adjustment lever / reverse sewing
Adjust the stitch length by turning the
milled nut on lever 1as required.
Reverse sewing
For reverse sewing, push lever 1up
during sewing.
●
●
1

16
Controls
Fig. 7 - 05
7.05 Top feed stroke limitation
To limit the top feed stroke, loosen
knurled nut 1and move the lever up or
down accordingly. Lock the lever in positi-
on by tightening knurled nut 1.
During sewing, the selected adjustment
can be triggered by using the correspon-
ding pedal function, see Chapter 7.02
Pedals.
After adjustment, tighten the knurled nut
again.
●
●
●
1
Fig. 7 - 06
7.06 Visual indicator -921/01 (optional)
When the left pedal is pressed, the visual
indicator lights up (five light segments =
maximum top feed stroke).
●
1

17
Controls
7.07 Adjustment nut for the top-feed stroke
Switch the machine off!
Danger due to unintentional
starting of the machine!
Open cover 1on the back of the
machine, loosen screw 2and move as
required.
●
7.08 Control panel (only on machines with Quick EcoDrive)
The description can be found in the separate instruction manual for the control panel.
Fig. 7 - 07
2
1

18
Installation and commissioning
8 Installation and commissioning
The machine must only be mounted and commissioned by qualified personnel!
All relevant safety regulations are to be observed!
If the machine is delivered without a table, it must be ensured that the frame
and the table top which you intend to use can hold the weight of the machine
and the motor. It must be ensured that the supporting structure is sufficiently
sturdy, including during all sewing operations.
8.01 Installation
The site where the machine is installed must be provided with suitable connections for the
electric current, see Chapter 3Specifications.
It must also be ensured that the standing surface of the machine site is firm and horizontal,
and that sufficient lighting is provided.
The method of packaging used requires that the table top be lowered for trans-
port. The following is a description of how to adjust the height of the table top.
8.01.01 Adjusting the table-top height
Loosen screws 1and 2and set the desired table-top height
Tighten screws 1well.
Adjust the position of the pedal so that you can operate it comfortably and tighten screw 2.
●
●
●
Fig. 8 - 01
2
1
1

19
Installation and commissioning
Fig. 8 - 03
Fig. 8 - 02
1
4
2
109-001
3
1
2
109-020
8.01.03 Tightening the V-belt
Fit the V-belt.
Loosen nut 1and tighten the V-belt by
turning motor mounting 2.
Tighten nut 1.
●
●
●
8.01.02 Assembling the motor (only on machines with Quick-motor)
Assemble motor mounting 1, motor 2, belt guard support 3and belt pulley 4as shown in
Fig. 8-02.
●

20
Installation and commissioning
Fig. 8 - 04 109-071
1
2
3
4
2
8.01.05 Fitting the upper belt guard
If a large balance wheel is
used, the corner 1of the belt
guard 3must be broken out.
Screw stop piece 2onto belt guard part 3.
Screw on belt guard part 3onto the
housing.
Screw on belt guard part 4onto the
housing.
Secure belt guard parts 5and 6onto the
table top.
●
●
●
●
2
Fig. 8 - 05
3
4
1
6
5
8.01.04 Mounting the bottom V-belt guard
Loosen screws 2and adjust belt guard support 1so that the motor pulley and V-belt run
freely.
Tighten screws 2and Fasten belt guard 3with screw 4.
Fig. 8-04 shows a Quick-motor. If a different motor is used, follow the instruc-
tions of the Motor Instruction Manual.
●
●