Question about Lincoln Electric Foot Amptrol K870

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I have ripped the plug off my k870 amptrol. What colour wires go where on the plug to be soldered...

This is off my 255 tig lincoln machine.

Posted by Anonymous on

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Posted on Jan 02, 2017

luis_david
  • 407 Answers

SOURCE: My K870 foot amptrol no

Hi:

Yes you can repair it yourself, the footcontrol has a micro switch that with time and use it wears out. Contact your welding sales rep or your nearest praxair store (www.praxairdirect.com) and request the micro switch, the sales rep will ask you for the code on the foot control, that one is on the plate on the footcontrol.

Good luck,

Posted on Jul 15, 2011

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Hi:

Yes you can repair it yourself, the footcontrol has a micro switch that with time and use it wears out. Contact your welding sales rep or your nearest praxair store (www.praxairdirect.com) and request the micro switch, the sales rep will ask you for the code on the foot control, that one is on the plate on the footcontrol.

Good luck,

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You need to get a diagram of the connector on the pedal, and check the contacts leads that trigger the power on. If the power on contacts are not opening up when you let up on the pedal then the problem is in the pedal, and you will need to open it up to find the problem. If the pedal is opening and closing as it should the problem is most likely in the welders control board. I just went through a similar problem on my Miller TIG, where the pedal wasn't the problem. If you have a bad board in the welder there are places on the internet that rebuild them, for much less than Lincoln would charge for a replacement. Try the two places listed below for circuit boards if you need them.

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Hook up


I think I can help you do this, let's start with the general and you can ask questions if we don't cover everything you need.

The HF251D connects to the welding machine using 3 cables, you connect the Electrode terminal on the welding machine (the Lincoln) to the Electrode In terminal inside the HF251. Connect the Work terminal on the Lincoln to the Work In/Out inside the HF251, also connect the work (ground) clamp of your torch to this terminal. Be careful to select the correct size cables for the maximum current you intend to weld with.

The 3rd cable is the gray 14 pin round control cable that comes out the back of the HF251, it needs to be plugged into your Lincolns RMT14 socket. You'll also need to make sure that the Lincoln is set for remote control, this is usually a switch on the front panel. I'm pretty sure that the remote control cables have a standard pin layout, but we can check this by comparing the specs in both owners manuals.

After that you connect the torch and gas bottle to the HF251, start the Lincoln, and TIG weld until you're happy.

I've got a manual for the HF251 and can get a shop manual for it if we need it. What I'm not sure about is your Lincoln - what model is it exactly?

regards,
Carl

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