20 Most Recent Hobart Handler 140 Mig Welder Questions & Answers


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.

Hobart Handler... | Answered on Aug 10, 2016


Locate your locale Hobart welding distributer, or contact hobart, the are nice people and will give you all the avice you need.

Hobart Handler... | Answered on May 02, 2016


Hi:
Sounds like you have the wrong polarity in your machine. If you are using flux core wire, make sure to connect your ground clamp to the positive side and your gun to the negative side. Dial the right voltage and wire speed according to wire size and metal thickness.Let me know if this help.
Regards,D.S.

Hobart Handler... | Answered on May 02, 2016


The main control circuit for the welder has gone bad....cost about $198.
Might be better off to buy a new welder.

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/sean_54c3a3dc48a7773c

Hobart Handler... | Answered on Dec 22, 2015


If it is new i would not play around with the welder Just take it back to where you bought it get them to replace it under warranty

Hobart Handler... | Answered on Sep 17, 2015


If you completely remove wire from unit does it still slowdown and stop when you pull trigger?
If yes, then 2 most common problems are
A. Thermistor @ position PTC1 on circuit board
B. Drive Roller Motor

To diagnose, locate thermistor @ position PTC1 in upper middle part of circuit board.
It's yellowish round and about 1/2" in diameter.
Jumper Accross the 2 leads, use a small insulated screwdriver or meter probe.


1. Pull trigger on gun, when motor slows or stops then jumper the leads, if it speeds back up then it's the Thermistor
Replace with a Raychem RXE 1.85A @ 72 v
Or comparable, try EBay

2. If no change, isolate motor by removing the 2 leads and connect a 9-12 volt DC battery source, does motor spin? If not then motor is problem. If motor spins and is constant then additional troubleshooting needed, next possible issues are bad resistor or scr

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Hobart Handler... | Answered on Jul 03, 2015


check main contactor or diode bank.

Hobart Handler... | Answered on Feb 20, 2015


What have you tried so far?

Hobart Handler... | Answered on Jan 16, 2015


The transistor is mounted on the main circuit board, you cannot buy the part from Hobart or Miller, they only sell the complete circuit board.
If you can read any part numbers from the transistor you can purchase the part from a electronic parts supplier.

Hobart Handler... | Answered on Jul 23, 2014


I have found that keeping the gun lead as straight as possible fixes this problem. Also it is sometimes recommended to use one tip size bigger when welding with flux core wire. My last spool was radnor flux core wire .030, and a .035 tip keeping the lead as straight as possible and it welded extremely well. If that doesn't solve it you should take everything apart and clean it / blow it out with compressed air.

Hobart Handler... | Answered on Jun 06, 2014


bad computer-its an authorized dealer thing-you can pay 1-200 to get it figured out or buy a HF flux core welder for same price.

yeah-Im all blue in my shop and I said HF...

i would pay the miller dealer to get it fixed.

Hobart Handler... | Answered on May 09, 2014


should be adjusters where the wire feeds out to the hose... adjust those. couple of youtube videos online should help you out

Hobart Handler... | Answered on May 09, 2014


The first thing to check would be to see if you have open circuit voltage at the weld output terminals when you push the pedal. Make sure the high frequency is off if you are going to to check with a multimeter. After that if you do have OCV but no high frequency to start the arc, try it in start and in continuous. When you put it in continuous it bypasses a control relay. Also check the HF points to make sure they are clean and gapped to about ten thousandths.

Hobart Handler... | Answered on Apr 10, 2014

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