Hobart Welding Tools - Page 5 - Popular Questions, Answers, Tips & Manuals

Hi:

In order to check the wire speed control you will need to open the machine and test the wire speed control mechanism (rehostat, potentiometer) with the use a volt meter. If you see a a variation on it while moving the knob then your problem is the PC board.

Good luck and have a great day.

Hi larryhannah6...

Make sure you are getting spark at the spark plug, to do this:
Remove your spark plug and check to be sure you are getting a bright blue spark at the spark plug.
You do this by grounding the plug on the head of the engine and pulling the crank rope...watching the plug for spark.
If you are getting a nice blue spark then skip A below and go to B.
A...If you do not get a nice blue spark then you may need to replace the electronic module.
Note: If you have to replace the module be sure to measure the position it is in, it is critical to starting.
Take a picture for later reassembly.
B...Also take some fine grit sandpaper (not emery) and lightly sand the flywheel where the magnet is located to clean any rust or corrosion from the magnet area.
Then follow the procedure below:
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Sounds like you have dirt/debris in your caburetor jets,fuel passages or a diaphgram that is becoming non-flexible.
Check/Clean/Replace your Air Filter, a dirty air filter can make your engine run to rich with fuel.
Note: ALWAYS USE COMPRESSED AIR TO CLEAN YOUR JETS AND PASSAGES, VERY IMPORTANT.
Note:Before you disassemble the carburetor:
Write down on a piece of paper and or take a picture of how the linkage attaches to your carburetor for later reference when you go to reinstall your carburetor.
Mark each piece with a awl, or some kind of sharp instrument that will make an alignment scratch before you disassemble the carburetor into separate pieces.
That way you will know which way it goes back together when you reassemble it.
Sometimes you can get by with priming the carburetor or by using a very small shot of starting fluid and letting it run a few times like that, and it will flush the gunk out of the jets,but most of the time you will need to rebuild the carburetor.
Be sure to check your fuel tank for water and dirt/debris, if there is water/debris then you need to clean your tank.
Check you fuel line/s condition...after a while they will degrade and need replacement.
Check/Clean/Replace your fuel filter if you have one.
When you remove your fuel lines from the carburetor be sure to make a drawing or take a picture of how the lines are connected to the carburetor.
Also a good time to take a picture for later reference for reassembly.
If the generator is over a couple of years old, then I recommend that you buy and install a new carburetor repair kit,because the diaphragm will get hard and that will cause it to be hard to crank.
The diaphgram may look good and flexible, but it can be deceiving and not act as a fuel pump as it should because it has become too hard and will cause hard starting,start and run and shut off, etc.
When you clean your carburetor, I recommend that you use a laquer thinner type cleaner to clean and dissolve the laquer build-up in the float and needle jet passages.
Be sure to remove all plastic and rubber parts before using the laquer thinner because it can dissolve the plastic parts and render them unuseable.
Be sure to use COMPRESSED AIR to blow out all the fuel and air passages.The higher air pressure is needed to blow some of the trash/debris from the fuel or air passages.
Be careful when blowing out the passages, because there are sometimes small rubber type seats in the bottom of some of the passages.
Keep in mind that the float (if you have one) for the carburetor must be level when you go to reassemble the carburetor or follow the instructions you get with the carburetor kit, or you could also ask the parts man that you get your kit from.
When you clean your carburetor and remove the jet screws, you will first need to lightly seat the jet screws.
But before you lightly seat the jet screws count the number of turns it takes to seat the jet screws from their original position.
Be sure to mark the turns down on a piece of paper.
That way when you put the jets back in, you know to lightly seat them first and then turn them back out to their original position before you started.
Once you have your carburetor cleaned/rebuilt that should solve your problem.
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I am having the same exact problem on an old Hobart Beta Mig 200 sometimes i can weld for 5 minutes and other times as soon as I hit the trigger it trips the 50amp breaker. Any help?

Make sure you have a good ground. If ground is good, make sure you are holding the tip level to the work and right up close.

Hi:
Have you disconnect the gun's power plug? If the wire and gas stop flowing by doing this action, then your problem is the gun's trigger. If the machine continues to feed gas and wire with the gun disconnected then yes, it is the pc board.
Good luck.

Are there any numbers on the diodes. If so, do a web search to find cross reference and supplier. You can use any brand diode if it matches current and reverse voltage specs.

Hi:Your trigger switch must be bridging the contacts, open the gun's handle and check the wires.

Hi:

I think you have a problem with either:

Gun liner which could be kinked and need to be replace, or,

Drive rolls, make sure you are using the right size and right type for the wire used.

If using hard wire (gas wire) you should be using U-grooved drive rolls, if using innershiedl wire then V-knurled drive rolls must be in place.

Hi:
I don't know how old it's your machine but the most common problem for the wire speed control is the rheostat. The coil must be worn out and there is no more contact in the required range. This is an easy fix, call your local welding store and request the wire speed control. If you don't have a local welding store and you are in the USA you can check the link below for sales, call them of input your zip code for the nearest store location:
http://www.praxairdirect.com/webapp/wcs/stores/servlet/TopCategories1_10152_10051_-1
If you machine is not old (more than 3 years) then your problem will rely on the main pc board.

you may need a gun liner, if the liner is kinked the wire will not feed, causing a "birdnest" and if the wadded up wire touches the cabinet while the trigger is keyed it will get hot and try to weld wherever it is grounding e.g. the cabinet. try a liner first they are only 20 bucks

Hi:

If you see rust on the wire then you should stop and change the gun's liner, change the contact tip and clean the feed rolls. Rust can accumulate inside the gun and make the wire feeding a problem.

Serial number does not come up as a valid one. Check again.

The weld wiring burning doesn't meant the transformer is good, it only means you have shorted hot to ground and thats what happens when hot touches ground it heats and melts. I would start by looking for a schematic for you welder. Check and making sure your getting good power to the power supply, relay(s) first. Also you can ohm out the transformer and check for the proper resistance but without the schematic/wiring diagram I can't say what the specs are. Normally on these the power comes in to the switch and then to the relay(s) which send power to the fan, and then splits to the trigger which allows power to the transformer, wire feed motor etc. But without the diagram your just shooting in the dark.

Sound like you have a bad trigger on the gun. Does gas spray when you pull the trigger? Check the wire plug that goes from the pistol to the unit. It should be under the liner hose where it connects to the machine. Then use a voltage meter on the wires going to the drive feed motor, and see if you get current when you pull the trigger. If gas doesn't spray neither, sounds like you got a bad trigger switch

Hi:

Looks like your speed wire control went bad, this is just a rheostat that with normal use the coil will wear off and lose contact. Don't know the year of your machine but this item it is an inexpensive item to replace and you can do it yourself. Part number is MIL 000101 and the cost is around $150.00. If you need the owners manual let me know.

Have a good day!!

Hi:

call your nearest Praxair location (www.praxairdirect.com) and order it by phone or by the web site.

Depends where you are they will charge you delivery by ups.

Hi:

You are worrying too much, just take out the inner liner and replace it for a new one. A liner will cost you around 15.00 and it is pretty easy to change. Check your onwers manual or email me for step by step liner replace.
Best regards,
[email protected]

Check for spark and compression.

Hi:

have you tried to by-pass the gun switch by disconnecting the gun cable (not the lead) and using a paper clip to by-pass the gun?. If the motor turns then you need to replace the gun switch if not probably the PC board fuse it's blown.

Depending on how old you machine is, its possible that the wire feed rollers are worn causing the wire to slip in the grooves. Replacing the WFRs may solve the problem. Test this by watching the feed rollers as you pull the torch trigger, place a gloved hand over the nozzle as the wire comes out and watch to see if the rollers slip on the wire when the wire meets the resistance of the glove. If it does that likely the problem. Hope this solves the problem.