Atlanta Attachment Company 1344S88 User manual

Atlanta Attachment Company
362 Industrial Park Drive
Lawrenceville, GA 30046
770-963-7369 • www.atlatt.com
Technical Manual & Parts Lists
Model 1344S88
Revision 2.5Updated Jan 5, 2016

Technical Manual & Parts Lists
ATLANTA ATTACHMENT COMPANY,INC.
Confidential and Proprietary Information
The materials contained herein are confidential and proprietary information of Atlanta
Attachment Company. In addition to any confidentiality and non-disclosure obligations that currently
exist between you and Atlanta Attachment Company, your use of these materials serves as an
acknowledgment of the confidential and proprietary nature of these materials and your duty not to make
any unauthorized use or disclosure of these materials.
All materials contained herein are additionally protected by United States Copyright law and
may not be used, disclosed, reproduced, distributed, published or sold without the express written
consent of Atlanta Attachment Company, which consent may be withheld in Atlanta Attachment
Company’s sole discretion. You may not alter or remove any copyright, trademark or other notice from
copies of these materials.
IMPORTANT
It is important to read and understand the information contained within this
manual before attempting to operate the machine. Atlanta Attachment Co., Inc.
shall not be held liable for damage resulting from misuse of the information
presented within, and reserves the right to change the information contained
within, without prior notification.

Technical Manual & Parts Lists
Contents
Important Safety Instruction ....................................................................................................................... 1
Liability ...................................................................................................................................................... 2
Safety Equipment on the Machines ............................................................................................................ 3
Protective Eyewear ..................................................................................................................................... 4
Important Notices........................................................................................................................................ 5
Maintenance ................................................................................................................................................ 7
Repair .......................................................................................................................................................... 8
A Word to the End User.............................................................................................................................. 9
Safety Precautions ....................................................................................................................................... 9
General Machine Data .............................................................................................................................. 10
Electrical & Pneumatic Specifications...................................................................................................... 10
Installation & Setup .................................................................................................................................. 10
Parameter Settings for Efka Controller ..................................................................................................... 11
Electric Eye Sensor Adjustment ............................................................................................................... 12
Reflective Tape Maintenance ................................................................................................................... 12
Servicing the Sew Head ............................................................................................................................ 13
Installation................................................................................................................................................. 13
Lubrication ................................................................................................................................................ 14
Setting the Needle ..................................................................................................................................... 15
Threading the Machine ............................................................................................................................. 16
Upper Threading ....................................................................................................................................... 16
Lower Threading ....................................................................................................................................... 16
Threading the Loopers .............................................................................................................................. 17
Tension ...................................................................................................................................................... 17
Pressure ..................................................................................................................................................... 17
Presser Foot Pressure ................................................................................................................................ 17
Alternating Pressers .................................................................................................................................. 17
Alternating Presser with Pneumatic Pressure Control .............................................................................. 18
Upper Feed Roll Pressure ......................................................................................................................... 18
Stitch Length ............................................................................................................................................. 18
Machine with Puller Feed ......................................................................................................................... 19
Presser Bar Lift ......................................................................................................................................... 19
Machines with Alternating Pressers.......................................................................................................... 20
Setting the Height of Feed Bar .................................................................................................................. 21
Centralizing the Feed Dog ........................................................................................................................ 21
Setting the Height of the Feed Dog........................................................................................................... 21

Technical Manual & Parts Lists
Timing the Feed Lift Eccentric ................................................................................................................. 22
Needle Bar Positioning ............................................................................................................................. 22
Positioning the Loop Deflectors ............................................................................................................... 22
Setting the Distance from the Looper to the Needle ................................................................................. 23
Sidewise Setting ........................................................................................................................................ 23
Lengthwise Setting & Setting the Height of the Needle Bar .................................................................... 23
Timing Looper Driving Crank .................................................................................................................. 24
Setting the Needle Guards ........................................................................................................................ 24
Positioning Spreader ................................................................................................................................. 25
Sidewise and Height Setting ..................................................................................................................... 25
Changing Movement of Spreader ............................................................................................................ 25
Adjusting Needle Thread Take-Up ........................................................................................................... 26
Adjusting Needle Thread Tension Releaser ............................................................................................. 26
Adjusting Looper Thread Take-Up ........................................................................................................... 26
Singer® 300UX6 Assembly Drawings & Parts Lists ............................................................................... 28
Upper Shaft Assembly .............................................................................................................................. 30
Front Assembly Sewing Arm.................................................................................................................... 32
External Parts Sewing Arm #1 .................................................................................................................. 34
Lower Shaft Assembly .............................................................................................................................. 36
Front Assembly Sewing Bed .................................................................................................................... 38
Cross Shaft in Sewing Bed ....................................................................................................................... 40
External Parts Sewing Arm #2 .................................................................................................................. 42
External Parts Sewing Arm #3 .................................................................................................................. 44
External Parts Sewing Arm #4 .................................................................................................................. 46
External Parts Sewing Arm #5 .................................................................................................................. 48
Assembly Drawings & Parts Lists ............................................................................................................ 50
11344S88 Main Assembly ........................................................................................................................ 52
1338150 Sewing Head Assembly ............................................................................................................. 53
1335-110B Footlift Assembly .................................................................................................................. 54
1344029 Linear Guide Assembly ............................................................................................................. 55
1339-1500A Pneumatic Panel................................................................................................................... 56
1338SFS88-PD Pneumatic Diagram......................................................................................................... 57
1338SFS-WD Wiring Diagram................................................................................................................. 58

Technical Manual & Parts Lists
1
Important Safety Instruction
This part of the Instruction Material is provided for the safe use of your equipment.
It contains important information to help work safely with the unit and describes the
dangers inherent in machinery. Some of these dangers are obvious, while others are
less evident.
Mandatory Information
All persons operating and/or working on the 1344S88 Panel Binder should read and understand all parts
of the Safety Instructions. This applies, in particular, for persons who only operate and/or work on the
unit occasionally (e.g. for maintenance and repair). Persons who have difficulty reading must receive
particularly thorough instruction.
Scope of the Instruction Material
The Instruction Material comprises:
Safety information
Operator Instructions
Electrical and Pneumatic diagrams
And may also include;
A list of recommended spare parts
Instruction Manual(s) for components made by other manufacturers
The layout and installation diagram containing information for installation
Intended Use
Our machines are designed and built in line with the state of the art and the accepted safety rules.
However, all machines may endanger the life and limb of their users and/or third parties and be damaged
or cause damage to other property, particularly if they are operated incorrectly or used for purposes
other than those specified in the Instruction Manual.
Exclusion of Misuse
Non-conforming uses include, for example, using the equipment for something
other than it was designed for, as well as operation without duly installed safety
equipment. The risk rests exclusively with the end user.
Conforming use of the machine includes compliance with the technical data,
information and regulations in all parts of the complete Instruction Material, as
well as compliance with the maintenance regulations. All local safety and
accident prevention regulations must also be observed.

Technical Manual & Parts Lists
2
Liability
The machine should only be operated when in perfect working order, with due regard for safety and the
potential dangers, as well as in accordance with the Instruction Material. Faults and malfunctions
capable of impairing safety should be remedied immediately. We cannot accept any liability for personal
injury or property damage due to operator errors or non-compliance with the safety instructions
contained in this booklet. The risk rests exclusively with the end user.
The Instruction Material should always be kept near the machine so that it is accessible to all concerned.
The local, general, statutory and other binding regulations on accident prevention and environmental
protection must also be observed in addition to the Instruction Material. The operating staff must be
instructed accordingly. This obligation also includes the handling of dangerous substances and
provision/use of personal protective equipment.
The Instruction Material should be supplemented by instructions, including supervisory and notification
duties with due regard for special operational features, such as the organization of work, work
sequences, the personnel deployed, etc.
The personnel's awareness of the dangers and compliance with the safety regulations should be checked
at irregular intervals.
Choice and Qualification of Personnel
Ensure that work on the machine is only carried out by reliable persons who have been appropriately
trained for such work - either within the company, by our field staff or at our office - and who have not
only been duly appointed and authorized, but are also fully familiar with the local regulations. Work on
the machine should only be carried out by skilled personnel, under the management and supervision of a
duly qualified engineer.
This not only applies when the machine is used for production, but also for special work associated with
its operation (start-up and maintenance), especially when it concerns work on the hydraulic or electrical
systems, as well as on the software/serial bus system.
Training
Everyone working on or with the machine should be duly trained and informed with regard to correct
use of the safety equipment, the foreseeable dangers which may arise during operation of the machine
and the safety precautions to be taken. In addition, the personnel should be instructed to check all safety
mechanisms at regular intervals.
Responsibilities
Clearly define exactly who is responsible for operating, setting-up, servicing and repairing the machine.
Define the responsibilities of the machine operator and authorize him to refuse any instructions by third
parties if they run contrary to the machine's safety. This applies in particular for the operators of
machines linked to other equipment. Persons receiving training of any kind may only work on or with
the machine under the constant supervision of an experienced operator. Note the minimum age limits
permitted by law.

Technical Manual & Parts Lists
3
A Word to the Operator
The greatest danger inherent in our machines:
is that of fingers, hands or loose clothing being drawn into a machine by live, coasting or rotating tools
or assemblies or of being cut by sharp tools or burned by hot elements.
ALWAYS BE CONSCIOUS OF THESE DANGERS!
Safety Equipment on the Machines
All machines are delivered with safety equipment, which shall not be removed or
bypassed during operation.
The correct functioning of safety equipment on machines and systems should be
checked every day and before every new shift starts, after maintenance and repair
work, when starting up for the first time and when restarting (e.g. after prolonged
shutdowns).
If safety equipment has to be dismantled for setting-up, maintenance or repair work, such safety
equipment shall be replaced and checked immediately upon completing the maintenance or repair work.
All protective mechanisms shall be fitted and fully operational whenever the machine is at a standstill or
if it has been shut down for a longer period of time.
Damage
If any changes capable of impairing safety are observed in the machine or its mode of operation, such as
malfunctions, faults or changes in the machine or tools, appropriate steps must be taken immediately, the
machine switched off and a proper lockout tagout procedure followed. The machine should be examined
for obvious damage and defects at least once per shift. Damage found shall be immediately remedied by
a duly authorized person before resuming operation of machine.
The machine should only be operated when in perfect working order and when all protective
mechanisms and safety equipment, such as detachable protective mechanisms, emergency STOP
systems, etc. are in place and operational.
Faults or Errors
The machine must be switched off and all moving or rotating parts allowed to come to a standstill and
secured against accidental restart before starting to remedy any faults or errors.
Signs on the Machine
Safety and danger signs on the machine should be observed and checked at regular intervals to ensure
that they are complete and undamaged. They should be clearly visible and legible at all times.
Clothing, Jewelry, Protective Equipment
Long loose hair, loose-fitting clothes, gloves and jewelry, including rings, should be avoided in order to
avoid injuries due to being caught, drawn in and wound up inside the machine.

Technical Manual & Parts Lists
4
Protective Eyewear
Protective eyewear that has been tested by the local authorities should be worn
whenever there is a possibility of loose or flying objects or particles such as when
cleaning the machine with compressed air.
Tools
Always count the number of tools in your possession before starting work on the machine. This will
allow you to check that no tools have been left behind inside the machine. Never leave a tool in the
machine while working.
Oils, Lubricants, Chemicals
Note the applicable safety regulations for the product used.
No Smoking, Fire, Explosion Hazard
Smoking and open flame (e.g. welding work) should be prohibited in the production area due to the risk
of fire and explosions.
Workplace
A clear working area without any obstructions whatsoever is essential for safe operation of the machine.
The floor should be level and clean, without any waste.
The workplace should be well lit, either by the general lighting or by local lights.
Emergency STOP
The emergency STOP buttons bring all machine movements to a standstill. Make sure you know exactly
where they are located and how they work. Try them out. Always ensure easy access to the nearest
emergency STOP button while working on the machine.
First Aid
1. Keep calm even when injured.
2. Clear the operator from the danger zone. The decision of what to do and whether to seek
additional assistance rests entirely with you, particularly if someone has been trapped.
3. Give First Aid. Special courses are offered by such organizations as the employers' liability
insurance association. Your colleagues should be able to rely on you and vice versa.
4. Call an ambulance. Do you know the telephone numbers for the ambulance service, police and
fire service?

Technical Manual & Parts Lists
5
Important Notices
Reporting and Fighting Fires
Read the instructions posted in the factory with regard to reporting fires and the emergency exits. Make
sure you know exactly where the fire extinguishers and sprinkler systems are located and how they are
operated. Pass on the corresponding information to the firemen when they arrive. Ensure there are
enough signs to avoid fire hazards.
The following fire extinguishers may be used:
- Dry powder extinguishers, ABC fire-extinguishing powder.
- Carbon dioxide fire extinguishers to DIN 14461 for electronic components. Great care must be
exercised when using carbon dioxide fire extinguishers in confined, badly ventilated rooms (see DIN
14406 and 14270).
Isolate the machine from the power supply if a fire breaks out. Do not use water on burning electrical
parts until it is absolutely certain that they have been completely disconnected from the power supply.
Burning oils, lubricants, plastics and coatings on the machine can give off gases and vapors that may be
harmful to your health.
A qualified person should be consulted to repair the damage after a fire.
Electrical Power Supply
Before undertaking any maintenance or repair work on the machine, switch off the
electrical power to the machine at the main source and secure it with a padlock so
that it cannot be switched on again without authorization.
In practice, this may mean that the technician, electrician and operator all attach
their own padlock to the master switch simultaneously so that they can carry out
their work safely. Locking extension plates should be available for multiple locks if
required. The primary purpose for a lockout/tagout procedure is to protect workers
from injury caused by unexpected energizing or start-up of equipment.
Energy sources (electrical/pneumatic/hydraulic, etc.) for the equipment shall be turned off or
disconnected and the switches locked or labeled with a warning tag. It is the responsibility of the
employer to establish control procedures. Follow lockout/tagout procedures before, setup and/or any
service or maintenance work is performed, including lubrication, cleaning or clearance of jams.
Caution: The machine is still not completely de-energized even when the master
switch is off.
- Electricity - The machine is always isolated from the electrical power supply whenever the master
switch has been switched off. However, this does not apply for the power supply in the control cabinet,
nor for equipment that does not draw its power via the master switch.
- Pneumatic / hydraulic energy - Almost all our machines carry compressed air. In addition to switching
off the master switch, the air supply must also be disconnected and the machine checked to ensure it is
depressurized before starting any work on the machine; otherwise the machine may execute
uncontrolled movements.

Technical Manual & Parts Lists
6
- Kinetic energy - Note that some motors or spindles, for example, may continue to run or coast run on
after being switched off.
- Potential energy - Individual assemblies may need to be secured if necessary for repair work.
Delivery of the Machine/Packaging
Note any markings on the packaging, such as weights, lifting points and special information. Avoid
temperature fluctuations. Condensation may damage the machine.
Transport Damage
The packaging and machine must immediately be examined for signs of damage in transit. Such damage
must be reported to the shipper/transporter within the applicable time limits. Contact Atlanta Attachment
Company and/or your transport insurer immediately, if signs of damage are visible. Never operate a
damaged machine.
Interim Storage
If the machine has to be stored temporarily, it must be oiled or greased and stored in a dry place where it
is protected from the weather in order to avoid damage. A corrosion-inhibiting coating should be applied
if the machine has to be stored for a longer period of time and additional precautions taken to avoid
corrosion.
Transporting the Machine
Disconnect the machine from all external connections and secure any loose assemblies or parts. Never
step under a suspended load. When transporting the machine or assemblies in a crate, ensure that the
ropes or arms of a forklift truck are positioned as close to the edge of the crate as possible. The center of
gravity is not necessarily in the middle of the crate. Note the accident prevention regulations, safety
instructions and local regulations governing transport of the machine and its assemblies.
Only use suitable transport vehicles, hoisting gear and load suspension devices that are in perfect
working order and of adequate carrying capacity. Transport should only be entrusted to duly qualified
personnel.
Never allow the straps to rest against the machine enclosure and never push or pull sensitive parts of the
machine. Ensure that the load is always properly secured. Before or immediately after loading the
machine, secure it properly and affix corresponding warnings.
All transport guards and lifting devices must be removed before the machine is started up again. Any
parts that are to be removed for transport must be carefully refitted and secured before the machine is
started up again.
Workplace Environment
Our machines are designed for use in enclosed rooms: Permissible ambient temperature approx. 5 - 40
°C (40 - 104 °F). Malfunctions of the control systems and uncontrolled machine movements may occur
at temperatures outside this range.
Protect against climatic influences, such as electrostatic charges, lightning strikes, hail, storm damage,
high humidity, salinity of the air in coastal regions.

Technical Manual & Parts Lists
7
Protect against influences from the surroundings: no structure-borne vibrations, no grinding dust, or
chemical vapors.
Protect against unauthorized access.
Ensure that the machine and accessories are set up in a stable position.
Ensure easy access for operation and maintenance (Instruction Manual and layout diagram); also verify
that the floor is strong enough to carry the weight of the machine.
Local Regulations
Particular attention must be paid to local and statutory regulations, etc. when installing machines and the
plant (e.g. with regard to the specified escape routes). Note the safety zones in relation to adjacent
machines.
Maintenance
General Safety Instructions
The machine shall be switched off, come to a standstill and be secured so that it cannot be switched on
again inadvertently before starting any maintenance work whatsoever. Use proper lockout/tagout
procedures to secure the machine against inadvertent startup.
Remove any oil, grease, dirt and waste from the machine, particularly from the connections and screws,
when starting the maintenance and/or repair work. Do not use any corrosive-cleaning agents. Use lint-
free rags.
Retighten all screw connections that have to be loosened for the maintenance and repair work. Any
safety mechanisms that have to be dismantled for setting-up, maintenance or repair purposes must be
refitted and checked immediately after completing the work.
Maintenance, Care, Adjustment
The activities and intervals specified in the Instruction Manual for carrying out adjustments,
maintenance and inspections must be observed and parts replaced as specified.
All hydraulic and pneumatic lines should be examined for leaks, loose connections, rubbing and damage
whenever the machine is serviced. Any defects found must be remedied immediately.
Waste, Disassembly, Disposal
Waste products should be cleared from the machine as soon as possible as not to create a fire hazard.
Ensure that fuels and operating lubricants, as well as replacement parts are disposed of in a safe and
ecologically acceptable manner. Note the local regulations on pollution control.
When scrapping (disassembling) the machine and its assemblies, ensure that these materials are disposed
of safely. Either commission a specialist company familiar with the local regulations or note the local
regulations when disposing of these materials yourself. Materials should be sorted properly.

Technical Manual & Parts Lists
8
Repair
Replacement Parts
We cannot accept any liability whatsoever for damage due to the use of parts made by other
manufacturers or due to unqualified repair or modification of the machine.
Repair, Electrical
The power supply must be switched off (master switch off) and secured so that it cannot be switched on
again inadvertently before starting any work on live parts.
Those parts of the machine and plant on which inspection, maintenance or repair work is to be carried
out must be isolated from the power supply, if specified. The isolated parts must first be checked to
determine that they are truly de-energized before being grounded and short-circuited. Adjacent live parts
must also be isolated.
The protective measures implemented (e.g. grounding resistance) must be tested before restarting the
machine after all assembly or repair work on electric parts.
Signal generators (limit switches) and other electrical parts on the safety mechanisms must not be
removed or bypassed. Only use original fuses or circuit overloads with the specified current rating. The
machine must be switched off immediately if a fault develops in the electrical power supply.
The electrical equipment of our machines must be checked at regular intervals and any defects found
must be remedied immediately.
If it is necessary to carry out work on live parts, a second person should be on hand to operate the
emergency OFF switch or master switch with voltage release in the event of an emergency. The working
area should be cordoned off and marked by a warning sign. Only use electrically insulated tools.
Ventilation/Hazardous Gases
It is the end users responsibility to ensure adequate ventilation is provided to exhaust any and all
noxious or hazardous gases that may be present in the working environment.
Hydraulic and Pneumatic Systems
Work on hydraulic or pneumatic equipment shall only be carried out by persons with training,
knowledge and experience of hydraulic systems. Pressure lines shall be depressurized before starting
any repair work.
General Liability
Liability for machine damage and personal injury is extinguished completely if any unauthorized
conversions or modifications are undertaken. The machine must not be modified, enlarged or converted
in any way capable of affecting safety without the manufacturer's prior approval.
Starting Machine Movements
Read the Instruction Manual carefully to establish which keys and functions start machine movements.

Technical Manual & Parts Lists
9
A Word to the End User
The end user has sole responsibility to enforce the use of safety procedures and guards on the machine.
Any other safety devices or procedures due to local regulations should be should be retrofitted in
accordance to these regulations and/or the EC Directive on the safety of machines.
Operator’s position must always be readily accessible. Escape routes must always be kept clear and
safety areas should be identified.
Safety Precautions
Safety should be a constant concern for everyone. Always be careful when working with this equipment.
While normal safety precautions were taken in the design and manufacture of this equipment, there are
some potential safety hazards.
Everyone involved with the operation and maintenance of this equipment should read and follow
the instructions in this manual.
Operate the equipment only as stated in this manual. Incorrect use could cause damage to the
equipment or personal injury.
It is the owner’s responsibility to make certain that the operator reads and understands this
manual before operating this equipment. It is also the owner’s responsibility to make certain that
the operator is a qualified and physically able individual, properly trained in the operation of this
equipment.
Specific safety warning decals are located on the equipment near the immediate areas of potential
hazards. These decals should not be removed or obliterated. Replace them if they become non-readable.
•ALWAYS keep safety shields and covers in place, except for servicing.
•ALWAYS maintain a safe distance from people when operating.
•ALWAYS operate equipment in daylight or with adequate working lights.
•Follow daily and weekly checklists, making sure hoses are tightly secured and bolts are
tightened.
•ALWAYS watch and avoid holes or deep depressions.
•ALWAYS wear adequate eye protection when servicing the hydraulic system and battery.
•NEVER operate a poorly maintained machine.
•NEVER allow persons to operate this machine without proper instruction.
•NEVER put hands or feet under any part of the machine while it is running.
•NEVER attempt to make any adjustments or repairs to the machine while running. Repairs or
maintenance should be performed by trained personnel only.
•NEVER work under the machine unless it is safely supported with stands, blocks or a hoist and
blocks.
•NEVER touch hot parts of machine.

Technical Manual & Parts Lists
10
General Machine Data
Electrical & Pneumatic Specifications
Electrical: 220 VAC, 5amp, 50/60 Hz Single Phase
Pneumatic: 70 PSI, 20 SCFM avg. (3/8” Airline).
Set the regulator to 70 PSI.
Installation & Setup
Remove all packing material (bubble wrap, foam padding, etc.).
Position the machine in a desired location on a sound and reasonably level floor.
Make sure that there is sufficient lighting over the machine.
Clean the machine of any dust that may have accumulated during shipping.
Make required electric and pneumatic connections using only appropriate connectors.
Make sure the voltage has been set correctly.
Important! - Before shipping, all oil from the sewing head is drained. Be sure to supply
oil to the sewing head before using the machine.

Technical Manual & Parts Lists
11
Programming Instructions:
1. Power on holding down the "P" button till "COD" is displayed.
2. Press ">>" once and enter the number "311"
3. Press "E" once and "2.0.0." is displayed this is a parameter
4. Proceed to the parameter to be changed and press "E"
5. The value now shows in the screen, adjust to desired value.
6. Press "E" to enter value and continue with parameter setting.
7. Repeat for other parameters, press "P" once when complete.
8. Run sewing head to save parameters before powering down
To Perform Master Reset of Parameters:
1. Power on holding down the "P" button till "COD" is displayed.
2. Press ">>" once and enter the number "591"
3. Press "E" twice and "093" is displayed.
4. Press "+" once, "094" is displayed.
5. Press "P" to exit programming mode with all default values.
LED 1: Off
LED 2: Off
LED 3: Off
LED 4: Off
LED 5: Off
LED 6: Off
LED 7: On, Stop at needle down.
LED 8: Off
Front panel LED's:
Parameter Settings for Efka Controller
Before Programming, Perform a Master Reset of Parameters (See Below)
PARAMETER RANGE VALUE DESCRIPTION
Mode of operation. MUST SET THIS PARAMETER FIRST!
111 300 Maximum speed
117 300 High lift walking speed limitation
123 300 Speed limitation n11
137 1 High lift on/off
153 35 Braking power at standstill
204 100 Footlift (FL) holding power
213 100 Backtack (VR) holding power
240 14 High lift output (flip/flop 1)
241 16 Stitch cond. Output (edge guide)
242 22 Speed limitation output (flip/flop 2)
252 150 Start delay angle of thread tension release
436 0
Use code "5319". This disables an input that was
causing box to reset itself.
340 50 IN1 Threshold (Enter code 5913)
344 50 IN3 Threshold (Enter code 5913)
On AB221A Motors:

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12
Electric Eye Sensor Adjustment
To adjust the sensor, first remove the clear
plastic cover from the end of the sensor. There are
two adjusting screws under the cover. One is
labeled “GAIN” and is used to set the sensitivity of
the sensor. The other screw is labeled “DO & LO”
and should always be fully clockwise.
With the end of the sensor pointing at the
center of the reflective tape, turn the “GAIN”
screw counter-clockwise until the red LED
indicator is off. Then turn the “GAIN” screw
clockwise until the LED indicator comes on. Then
turn the “GAIN” screw one full turn clockwise.
The LED indicator should be blinking slowly.
Cover the eye so that the sensor cannot see the
reflective tape and the LED should go off.
Reflective Tape Maintenance
Use a soft cloth for cleaning.
Do not use chemicals or abrasives to clean it.
Avoid any contact with oils and liquids.
Do not touch the tape with bare fingers.
If tape is dirty or opaque, the eye may not function correctly.

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13
Fig. 2
Servicing the Sew Head
Installation
Assemble the oil pan to the hangers. Insert the
assembled oil pan into the machine cut-out table placing
four rubber bushings in the hanger holes as shown in Fig. 1.
Attach the oil drain jar to the oil pan as shown in Fig. 2.
Place the machine on the oil pan assembly with the
four bed pins passing through the four rubber bushings
shown in Fig. 1.
Connect the foot lifter treadle to the foot lifter lever,
Fig. 3, at the back of the machine by chain furnished for this
purpose.
Fig. 1
Fig. 3

Technical Manual & Parts Lists
14
Fig. 4
Fig. 5
Lubrication
Machines of Class 300U have a semi-automatic lubricating system comprising of a hollow arm
shaft and a hollow bed shaft which act as oil reservoirs. The oil is distributed to all of the principal
bearings by centrifugal force through small jets in the shafts when the machine is in operation. Provision
is also made for hand lubricating other movable parts which are not lubricated from the reservoirs.
Caution: User Singer Oil, “Type B” or
“Type D”. Use “Type D” oil when oil is desired
which will produce minimum stain on fabrics even
after long period of storage.
Do not use additives in sewing machine oil as
they may cause a reduction in the normal flow of oil
that can result in damage to the machine.
Before starting the machine, the machine
must be oiled as instructed. Failure to do this will
result in damage to the machine.
The Pressure Oil Can, furnished with the
machine is to be used to oil all points requiring
lubrication.
To Oil the Arm Shaft
To fill the arm shaft reservoir, insert spout of the pressure oil can in hole, Fig. 4, and inject 1 shot
of oil into shaft twice daily.
To Oil the Bed Shaft
To fill the bed shaft reservoir, push the spring
cover, Fig. 5, to the left and insert spout of pressure
oil can into the hole and inject 1 shot of oil into shaft
twice daily. Close oil hole spring cover.
Other Oiling Points
Applying oil to all work plate and arm oil
holes, needle bar bearings and connections, needle
bar rock frame bearings, looper rocker sleeve and
presser lifting mechanism.
Caution: For machines in continuous use, all
oiling points must be oiled daily. Occasionally oil
tension release mechanism and looper pull-out rack.

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15
Setting the Needle
Refer to Fig. 6.
Turn the machine pulley over toward the operator until the needle bar is at its highest point.
Loosen the needle set screw.
Insert the needle into the needle bar and clamp as far as it will go making certain that the scarf of
the needle faces toward the left.
Fig. 6