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Manual 0-4759
SL55 Plasma Cutting
Hand Torch
Use with Lincoln
Installation and Operation Instructions
®
Pro-Cut® 55
General Information
Pro-Cut® 55
Torch Models
Cutting Capacity 60 Amps
Torch Leads Lengths
Applications
Power Supply
Used With:
Plasma Gas
Secondary Gas
Operating Pressure
Max. Input Pressure 125 psi / 8.6 bar
Gas Flow (Cutting
and Gouging)
Duty Cycle
Ambient
Temperature
Maximum Current 60 Amps
Voltage (Vpeak) 500V
Arc Striking Voltage 7kV
Current Rating
Cooling
Catalog No. 7-5255
Catalog No. 7-5256
25' / 7.6 m
50' / 15.2 m
Shielded Drag Cutting
Standoff Cutting
Lincoln® Pro-Cut 55
Compressed Air (Only)
70 - 75 psi
4.8 - 5.2 bar
250 scfh
(110 lpm)
100% @ 60 Amps
@ 250 scfh
104° F
40° C
Up to 60 Amps, DC,
Straight Polarity
Combination of Ambient
Air and Gas Stream
Through Torch
Refer to the Complete Assembly Replacement page for
configurations and catalog numbers.
These instructions are important for the proper installation
of the Torch. Read the instructions thoroughly before
attempting the installation. Keep these instructions for
reference.
Supplied Parts
The Replacement Torches include:
• Torch With Leads - 1 each
• Installation Instructions - 1 each
• Consumables (Installed on the Torch):
Art # A-04743
Electrode
The consumable parts installed in the Torch may
not necessarily be optimized for your Power Supply
or cutting application. For best results, refer to the
selection charts in this manual to choose the proper
consumables for your application.
The start cartridge supplied with this torch cannot
be used with any other 1Torch or on any other power
supply except Lincoln Pro-Cut 55.
Start Cartridge
Tip
NOTE
CAUTION
Shield Cup
Options
The following torch options are available. Refer to the
* Lincoln and Pro-Cut are registered trademarks of Lincoln
Electric.
©
2005 by Thermal Dynamics Corp., Printed in USA.
Manual 0-4759 1 January 10, 2006
complete assembly replacement list for catalog numbers.
• Cutting Guide Kits
• Leather Leads Covers
• Standoff Cutting Guide
Torch Specifications
A. Torch Configuration and Dimensions
Turn the connector locking ring to secure the connector to
the receptacle. Do not use the locking ring to pull the
connector into the receptacle.
The torch head is at 75° to the torch handle. The torch
includes a torch handle and torch trigger assembly.
9.5" (241 mm)
3.75"
(95 mm)
1.17" (29 mm)
Art # A-03322
B. Operating Notes
WARNING
This torch is not to be used with oxygen (O2).
NOTE
Operating pressure varies with torch model,
operating amperage, and torch leads length. Refer
to gas pressure settings chart for each model.
C. Direct Contact Hazard
For exposed tip the recommended standoff is 1/8" - 1/4"
(3 - 6.4 mm).
Spare Parts Label
Included with the torch is an adhesive label. Apply the
label to the power supply, where the operator can see it for
easy reference.
Torch Parts Selection
Refer to the Consumables Selection Chart for the various
torch parts for the application and operation.
WARNINGS
Disconnect primary power to the system before
disassembling the torch or torch leads.
DO NOT touch any internal torch parts while the
AC indicator light of the Power Supply is ON.
The shield cup (or shield cup body and shield cap or
deflector) holds the tip and start cartridge in place. Position
the torch with the shield cup facing upward to keep these
parts from falling out when the cup is removed.
Change the torch parts as follows:
1. Unscrew and remove the shield cup from the torch
head.
D. Parts-In-Place (PIP) Circuit - 12 vdc
The torch and leads include circuitry called Parts-InPlace (PIP). This circuit includes a switch on the torch
head. The shield cup closes this switch when properly
installed. The torch will not operate if this switch is
open.
To Control
Torch Switch
Cable Wiring
PIP Switch
A-04791
Torch Trigger
Shield Cup
Torch Head
Electrode
Start Cartridge
Tip
Shield Cup
Connecting Torch
Torch leads connect directly to the power supply receptacle.
Align the leads connector with the power supply
receptacle. Press the connector into the receptacle fully.
2. Tilt the torch head to remove the tip and start cartridge.
January 10, 2006 2 Manual 0-4759
A-03645
3. Fit the desired start cartridge and tip onto the electrode.
CAUTION
2. Adjust current output on the Power Supply to match
the selected tip and attach the work clamp firmly to the
work.
The start cartridge supplied with this torch cannot
be used with any other 1Torch or on any other power
supply except Pro-Cut 55.
NOTE
Refer to the consumables selection chart for the proper
combination of torch parts, including shield cups
and tips.
4. Hand tighten the shield cup until it is seated on the
torch head. Do not use tools to tighten the cup. If
resistance is felt when installing the cup, check the
threads before proceeding.
NOTE
When operating the torch in a normal condition, a
small amount of gas vents through the gap between
the shield cup and the torch handle. Do not attempt
to overtighten the shield cup as irreparable damage
to internal components may result.
Operating Gas Pressure
Set gas pressure at the power supply regulator according
to the following charts. These charts are a guide only;
adjust as necessary for best performance.
CAUTION
Do not operate the torch with the torch tip in contact
with the work at output currents greater than
40amps. Drag cutting at higher currents can cause
irreparable damage to the torch parts.
3. Hold the torch away from your body.
4. Slide the trigger release toward the back of the torch
while simultaneously squeezing the trigger. The pilot
arc will start.
Trigger
Trigger Release
A-02986
5. Bring the torch within transfer distance to the work. The
main arc will transfer to the work, and the pilot arc will
shut off.
Ga s P re ssure Se tti n g s
Leads Length
Tip
60A 70 ps i / 4.8 bar 75 psi / 5.2 bar
25' / 7.6 m 50' / 15.2 m
Cutting
The torch can be held comfortably in one hand or steadied
with two hands. Choose the holding technique that feels
most comfortable and allows good control and movement.
Sequence of Operation
1. Turn on power and adjust gas pressure on the Power
Supply pressure gauge. Refer to the charts for optimum
pressure settings for the combination of torch tip and
total lead lengths in use.
NOTE
The gas preflow and postflow are a characteristic of
the power supply and not a function of the torch.
Trigger
1
2
Trigger Release
3
4
Art # A-03383
Manual 0-4759 3 January 10, 2006
6. Cut as usual. Simply release the trigger assembly to
stop cutting.
7. Follow normal recommended cutting practices as
provided in the power supply operator's manual.
NOTE
When the shield cup is properly installed, there is a
slight gap between the shield cup and the torch
handle. Gas vents through this gap as part of normal
operation. Do not attempt to force the shield cup to
close this gap. Forcing the shield cup against the
torch head can damage components.
2. Wrong start cartridge installed.
a. The start Cartridge (9-8255) is specific to the
Pro-Cut 55. If any other start cartridge is
installed, the pilot arc will stop working after
post flow cycle and the Safety switch LED
will light steady on the power supply. Replace
the start cartridge with proper start cartridge,
(9-8255) and press the Safety Switch button
to reset the power supply.
3. Upper O-ring on torch head is in wrong position
8. The optional Standoff Guide allows the user to easily
adjust and maintain a consistent standoff height for
most applications.
Shield Cup
Standoff Guide
Torch Tip
Workpiece
Art # A-04063
Common Operating Faults
The following are the more common cutting faults and the
possible causes:
A. Torch will not pilot or is erratic when torch switch is
activated
1. Input air setting improperly set. Input air pressure needs
to be adjusted for proper pilot.
a. If air pressure is too low, erratic or no pilot will
result. Increase air pressure to recommended
level.
Art # A-03640
Upper Groove
with Vent Holes
Must Remain Open
Upper O-Ring
in Correct Groove
Threads
Lower O-Ring
B. Difficult Starting Main Arc
1. Torch standoff too high from workpiece
2. Bad or no connection between work cable and workpiece
C. Main Arc Extinguishes
1. Cutting speed too slow
2. Torch standoff too high from workpiece
3. Bad or no connection between work cable and workpiece
4. Worn torch parts
b. If air pressure is too high, the pilot arc will stop
working after post flow cycle and the Safety
switch LED will light steady on the power
supply. Press the Safety Switch button to reset
and decrease the air pressure to the recommend
level.
D. Insufficient Penetration
1 Cutting speed too fast
2. Torch tilted too much
3. Metal too thick
4. Worn torch parts
5. Cutting current too low
January 10, 2006 4 Manual 0-4759
E. Excessive Dross Formation
1. Cutting speed too slow
Inspection and Replacement of
Consumable Torch Parts
2. Torch standoff too high from workpiece
3. Worn torch parts
4. Improper cutting current
F. Short Torch Parts Life
1. Oil or moisture in air source
2. Exceeding system capability (material too thick)
3. Cutting speed too fast
4. Excessive pilot arc time
5. Gas pressure too low
6. Improperly assembled torch
7. Torch tip contacting work piece at or above 40Amps
A. General Information
WARNINGS
Disconnect primary power to the system before
disassembling the torch or torch leads.
DO NOT touch any internal torch parts while the
AC indicator light of the Power Supply is ON.
Unthread the shield cup assembly to remove the
consumable torch parts.
1. Inspect the cup for damage. Wipe it clean or replace if
damaged. Slag built up on the shield cup that cannot
be removed may affect the performance of the system.
Torch Head
Electrode
Start Cartridge
Tip
Shield Cup
A-03645
2. Check the tip for excessive wear (indicated by an
elongated or oversized orifice). Clean or replace the tip if
necessary.
Good Tip
Worn Tip
A-03406
Manual 0-4759 5 January 10, 2006
3. On torches with a shield cup body and a shield cap or
deflector, ensure that the cap or deflector is threaded
snugly against the shield cup body. In shielded drag
cutting operations (only), there may be an O-ring
between the shield cup body and drag shield cap. Do
not lubricate the O-ring.
Drag Shield Cap
6. Reinstall the Electrode by pushing it straight into the
torch head until it clicks.
WARNINGS
Refer to the consumables selection charts for the
proper combination of torch parts, including shield
cups and shield caps.
Shield
Cup Body
O-Ring No. 8-3488
Art # A-03878
4. Check the start cartridge for excessive wear, plugged
gas holes, discoloration, and for free movement of the
lower end plate. Replace if necessary.
Start Cartridge
Lower End Fitting
The use of any consumable parts other than
those specified by the Manufacturer may cause
irreparable damage to the torch head.
7. Reinstall the start cartridge and tip into the torch head.
Torch Head
Electrode
Start Cartridge
Tip
Shield Cup
Art # A-03621
CAUTION
The start cartridge supplied with this torch cannot
be used with any other 1Torch or on any other power
supply except Lincoln Pro-Cut 55.
5. Check the end of the electrode for excessive wear.
New Electrode
Art # A-03284
Worn Electrode
A-03645
8. Hand tighten the shield cup until it is seated on the
torch head. If resistance is felt when installing the cup,
check the threads before proceeding.
NOTE
When operating the torch in a normal condition, a
small amount of gas vents through the gap between
the shield cup and the torch handle. Do not attempt
to overtighten the shield cup as irreparable damage
to internal components may result.
January 10, 2006 6 Manual 0-4759
Torch Consumables
The illustration shows all consumable parts for this application.
Various front - end torch parts are available for different applications.
Use the single - piece shield cup for general purpose cutting operations with the torch tip in contact with the work (up
to 40 amps). This is the preferred method of cutting sheet metal up to 3/16" or 4.8 mm thick.
Also use the single - piece Shield Cup for 'standoff' cutting (with the torch tip 1/8" to 1/4" from the workpiece). This
is the preferred method for cutting metal thicker than 3/16" / 4.8 mm and at current levels above 40 amps. This
provides maximum visibility and accessibility.
Use the Shield Cup Body with the Deflector Shield Cap for improved resistance to reflected heat. This combination
provides cutting results similar to the single-piece Shield Cup, as well as easy change-over to gouging or drag shield
cutting.
Use the Shield Cup Body with the Drag Shield Cap for a consistent standoff distance with the drag shield in contact
with the workpiece. This is a simple and operator-friendly method of cutting between 40 and 60 amps.
The Standoff Guide fits both shield cup designs for this torch. The Guide allows the user to easily adjust and maintain
a consistent standoff height for most applications.
The start cartridge will not work for other applications.
Use only Genuine Thermal Dynamics consumables with this torch. The use of any other consumables may irreparably
damage the torch and/or void the warranty.
Start Cartridge
Electrode
9-8215
Art # A-04742
9-8255
DRAG SHIELD
CUTTING
Tip:
60A 9-8210
STANDOFF
CUTTING
Shield
Cup Body,
9-8237
Shield Cup
9-8218
O-Ring No. 8-3488
Shield Cap, Drag
50-60A 9-8235
Shield Cap, Deflector
9-8243
Standoff Guide
for All Applications
9-8422
Manual 0-4759 7 January 10, 2006
Replacement Hand Torch Parts
Item # Qty Description Catalog #
1 1 Torch Handle Replacement Kit (include items no. 2 & 3) 9-7030
2 1 Trigger Assembly Replacement Kit 9-7034
3 1 Handle Screw Kit (5 each, #6-32 x 1/2" cap screw, and wrench) 9-8062
4 1 Torch Head Assembly Replacement Kit (includes items No. 5 & 6) 9-8219
5 1 Large O-Ring 8-3487
6 1 Small O-Ring 8-3486
7 Leads Assembly with Lincoln Connectors (includes switch assemblies)
1 SL55 25' (7.6m) Leads Assembly 4-7867
includes valve assembly and Power Supply male connector
1 SL55 50' (15.2m) Leads Assembly 4-7868
includes valve assembly and Power Supply male connector
1
7
2
4
5
6
1
3
7
Art # A-04744
January 10, 2006 8 Manual 0-4759
Complete Assembly Replacement
Description Catalog #
Pro-Cut® 55
Options
Every effort has been made to provide complete and accurate information in this manual. However, the
publisher does not assume and hereby disclaims any liability to any party for any loss or damage caused by
errors or omissions in this Manual, whether such errors result from negligence, accident, or any other cause.
Hand Torches with Ergonomic Handle:
SL-55 Hand Torch 25 ft 7.6m 7-5255
SL-55 Hand Torch 50 ft 15.2m 7-5256
Leather Leads Cover, 25 foot / 7.6 m length 9-1270
Leather Leads Cover, 50 foot / 15.2 m length 9-1280
Straight Line Cutting Guide 7-8911
Radius / Roller Kit 7-7501
Circle Cutting Guide 7-3291
Deluxe Cutting Guide Kit 7-8910
Standoff Guide 9-8422
NOTE
Statement of Warranty
LIMITED WARRANTY: Thermal Dynamics® Corporation (hereinafter “Thermal”) warrants that its products will be
free of defects in workmanship or material. Should any failure to conform to this warranty appear within the time
period applicable to the Thermal products as stated below, Thermal shall, upon notification thereof and substantiation
that the product has been stored, installed, operated, and maintained in accordance with Thermal’s specifications,
instructions, recommendations and recognized standard industry practice, and not subject to misuse, repair, neglect,
alteration, or accident, correct such defects by suitable repair or replacement, at Thermal’s sole option, of any components
or parts of the product determined by Thermal to be defective.
This warranty is exclusive and is in lieu of any warranty of merchantability or fitness for a particular purpose.
LIMITATION OF LIABILITY: Thermal shall not under any circumstances be liable for special or consequential
damages, such as, but not limited to, damage or loss of purchased or replacement goods, or claims of customers of
distributor (hereinafter “Purchaser”) for service interruption. The remedies of the Purchaser set forth herein are
exclusive and the liability of Thermal with respect to any contract, or anything done in connection therewith such as
the performance or breach thereof, or from the manufacture, sale, delivery, resale, or use of any goods covered by or
furnished by Thermal whether arising out of contract, negligence, strict tort, or under any warranty, or otherwise, shall
not, except as expressly provided herein, exceed the price of the goods upon which such liability is based.
This warranty becomes invalid if replacement parts or accessories are used which may impair the safety or
performance of any Thermal Product.
This warranty becomes invalid if the product is sold by non-authorized persons.
All SureLok™ RPT Torches have a one year Parts & Labor warranty
Warranty repairs or replacement claims under this limited warranty must be submitted by an authorized Thermal
Dynamics® repair facility within thirty (30) days of the repair. No transportation costs of any kind will be paid under
this warranty. Transportation charges to send products to an authorized warranty repair facility shall be the responsibility
of the customer. All returned goods shall be at the customer’s risk and expense.
Manual 0-4759 9 January 10, 2006
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