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FAQ - Cobra Gooseneck

MIG Welding Gun (Welding Torch)

Q. Why is there is groove in my knurled drive roll?

PIB 0008-A Insulated Drive Rolls.

Q. How do I know if I have an old Cobra Gooseneck? Or System III? Or Cobra Gold?

Even though they all look the same, there are noticeable differences that distinguish each Model. The older Cobra Gooseneck utilizes a large nut that holds the conduit onto the end of the front body. The System III and the Cobra Gold both use a small set screw from the top of the handles. The majority of these older Cobra goosenecks have "S" clocked Amphenols.

The System III and the Cobra Gold goosenecks are very similar in appearance however the Cobra Gold does live up to its name. By looking down into the hole where the drive rolls are, the knurled drive roll, the idler arm and the gearbox all have a gold plated color. The System III has a gray colored idler arm and gearbox. These two guns have "W" clocked Amphenols.

Q. How can I tell if my 7 pin Amphenol is "S" or "W" clocked?

Both of these Amphenols are the same, except the rotational location of the pins, with respect to the keyway slot is different.

The "S" clocked has pins "A" and "F" on each side of the slot. While the "W" clocked Amphenol has pin "E" almost directly underneath the slot.

Q. Can I use the conduit from my Cobra Gooseneck on my Cobra Gold??

Yes. The conduit from the Cobra Gooseneck may have a Nut Kit attached. This kit can be removed and the conduit can be used on any MK welding gun.

Q. How do I test the potentiometer? "S" clocked:

Using an Ohm meter, measure resistance across pin ""D" (wiper) and pin "C". The resistance should vary from 0-5K ohms while turning the potentiometer.

Measure the resistance across pin "D" (wiper) and pin "A". The resistance should vary from 5K-0 ohms while turning the potentiometer.

Q. How do I test the potentiometer? "W" clocked:

Using an ohmmeter, measure resistance across pin "D" (wiper) and pin "C". The resistance should vary from 0-5K ohms while turning the potentiometer.

Measure the resistance across pin "D" (wiper) and pin "G". The resistance should vary from 5K-0 ohms while turning the potentiometer.

Q. How do I test the micro switch?

Place a continuity tester across pins "E" and "F". When the trigger is pulled, the signal should close.

Q. How can I tell if the Motor is bad?

Using an ohmmeter measure the resistance across pins "A" and "B". A good motor will have a resistance between 5-10 ohms.

Q. How do I know if my gooseneck is water cooled?

Coming out the back of the gun handle are five connections: 1) Conduit, 2) Electric Cable, 3) Welding Power Cable, 4) Gas Hose, and 5) Water Hose.

Q. What is the proper idler roll pressure?

Proper tension is achieved when wire does not slip if a small amount of pressure is added to the wire as it exists the tip.

Too little tension and the drive roll slips on the wire not pushing it out easily. Too much tension cuts into the wire causing excessive wire residue buildup, it also flatten and deforms the shape of the wire.

Q. What do I need to convert my Air Cooled gun to Water Cooled?

Remove and replace the weld power cable with a water cooled weld power cable (copper cable inside a water hose). Install a water hose to the extra barbed-end fitting.

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