Need help with Lincoln Tig 300/300

[MO-Iron]

When I moved my equipment into the new shop at my house, I left a 300/300 at the old shop(dad's farm) for occasional use. I have stick welded with the machine a few times a month for the last eleven years. Today I was going to tig a project and found that the high frequency is not working. When I hit the foot petal, the contactors kick in and if I short the tungsten to the work an arc will start. The gas will flow, water cooler working, have welding amperage that will vary with the pedal. Switches are flipped to tig, current control remote, spark switch on, soft start off. I am looking for suggestions on finding and fixing this problem.

Thank you in advance for your help!
MO-Iron

[cruizer]

Probably the hf transformer is trashed, about $80 bucks, as the new versions say from a linc 275, or miller syncrowave 300 are the same. Just don't have the part number handy. That or the points are out of whack. Possible but unlikely

[MO-Iron]

Thank you for the quick response.
I will report back after I get the top pulled off the machine.

[Synchroman]

What Cruizer said about the HF points may be important here. I formerly owned a Lincoln 250/250 TIG/Stick machine. After a few years the HF got to acting irregular. I removed the point contact rods and cleaned and reset them. The problem went away.

I suspect that if the machine has been sitting in a shop for a long time and only used for stick that the points need attention. IIRC, the gap is set a .010.

[H80N]

Probably the hf transformer is trashed, about $80 bucks, as the new versions say from a linc 275, or miller syncrowave 300 are the same. Just don't have the part number handy. That or the points are out of whack. Possible but unlikely

Cruizer....or... Miller Kevin. could you PLS post a modern substitute part number for this part

036 865, TRANSFORMER, high voltage 115 volt primary

[H80N]

After a bit of hunting around this HV Transfomer from an HF-251 looks like it can be made to wok....

might be the one Cruizer was thinking about...??

219927 [1/PK] XFMR,HIGH VOLTAGE 115V PRI 3600V SEC 34 MA W/TERM $83.82

http://miller4less.com/product_info.php?products_id=8115