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page 3
Part III Helpful Operating Tips (cont.)
Feeder:
1. Check drive rolls for wear; be sure drive rolls and guide
tubes are clean and free of debris. Do not overtighten drive
rolls; set as per manufacturer's specifications.
2. Use clean, non-corroded electrode.
3. When installing or replacing electrode, you may: remove
burrs from end of electrode, remove head/gas diffuser and
contact tip, and/or straighten the first few inches of elec-
trode.
Part IV Maintenance and Repair
See pages 6 and 7 for parts lists
Disconnect gun from equipment, allow to cool, and remove
electrode from liner before servicing.
Gas Diffuser
Section 1. Nozzle
A. Removal
Threaded fit nozzle can be removed by turning in a counter-
clockwise direction.
B. Service
Inspect nozzle for cracks and degradation of insulation.
Clean the nozzle as often as possible to prevent spatter
build-up which can lead to poor gas shielding or short cir-
cuiting. Replace the nozzle when loose, worn, or producing
erratic gas shield.
C. Installation
Replace threaded fit nozzle by threading in a clockwise direc-
tion. Nozzle body is used to secure contact tip.
Section 2. Contact Tip
Bernard has designed Centerfire™ Contact Tips to allow rapid installa-
tion and adjustment.
A. Removal
Cut electrode and remove all burrs. Remove threaded fit
nozzle by turning in a counterclockwise direction. Pull the
Centerfire Contact Tip from gas diffuser.
FIGURE #1
Contact Tip
Nozzle
End User Stocking Recommendations:
Nozzles ...................................... 5 for every 1 gun in service
Contact Tips .............................. 30 for every 1 gun in service
Gas Diffusers ............................ 4 for every 1 gun in service
Triggers ..................................... 1 for every 10 guns in service
Necks ........................................ 1 for every 20 guns in service
Handle Kits ................................ 1 for every 20 guns in service
Replacement Cables .................. 1 for every 20 guns in service
Strain Relief Kits ....................... 1 for every 20 guns in service
Adaptor Kits .............................. Order as Necessary
Power Pin Kits .......................... Order as Necessary
These stocking recommendations are only initial guidelines based on
an 80 hour work period. You should work closely with your distributor
to tailor a stocking program that suits your specific needs. Results will
vary.
B. Service
To extend contact tip life, reface front of contact tip and
clean the bore. Contact tips may be rotated in gas diffuser/
head socket providing additional wear surface and extending
the service life of the product.
C. Installation
Replacement is accomplished by cutting electrode and
removing all burrs. Slide contact tip over electrode into gas
diffuser and replace threaded fit nozzle by threading in a
clockwise direction. Nozzle body is used to secure contact
tip.
Section 3. Gas Diffuser
A. Removal
The head may be removed with an appropriate wrench in a
counterclockwise rotation.
B. Service
Inspect head for spatter, blocked gas ports, and carburized
surfaces. Clean as often as possible. Replace with new gas
diffuser when wear prevents engagement of contact tip or
nozzle.
C. Installation
Firmly secure gas diffuser with an appropriate wrench in a
clockwise rotation, torque to 144 in-lbs. Be sure insulator
cap is in place as shown in figure #1.
Section 4. Neck
A. Removal
Grasp lock nut and rotate counterclockwise, rotation will free
neck from end fitting.
B. Installation
Before installing, inspect neck and end fitting for debris,
clean if necessary. Install neck in reverse order, torque to 38
in-lbs. NOTE: Refer to Jump Liner literature for liner cut off
sizes (if used).
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