Miller Welding Tools - Page 5 - Popular Questions, Answers, Tips & Manuals
Miller 251 NT will stick weld great for about 10
This is a very complicated machine and so I will say upfront that only a qualified tech should work on it. There are 2 fuses mounted on a tray holding PCB2. The tray is mounted on the lifting bail. The fuses need to be checked. Also there are circuit breakers and fuses mounted on the front panel that need to be checked. PCB2 is a control board monitoring the output and shuts down the weld power and aux power if there is an overload. The idle board is also watching the output and won't let the machine idle down if there is an overload. I have included the manual. Check Page 27 for overload protection and F1 and F2. An overload will occur if there is a shorted generator, shorted cube rectifiers, or shorted output diodes. Again, after checking F1 and F2, only a qualified tech should work on the machine. Good luc
https://www.millerwelds.com/files/owners-manuals/O486H_MIL.pdf
Have a Miller Bobcat 250 that is using @ 1 qt oil
Air filter maintenance has a lot to do with it, but generally dirty air filter will let dirt into the cylinders and eventually score the cylinders, thus letting oil up on the head gasket. The heads or block could be warped. The valve guides could be worn.
I have a syncrowave 250, it is about 12 years old.
Jon,
I would like to suggest to you that you post this question on the millerwelds forum. There are some very experienced tech guys there that can help you much better. Go to millerwelds.com and select the forums under the resources tab. You will be surprised. Hope you can get it running again.
Ryan
My miller 175 wire feed does not feed wire at low number settings
Usually, the drive motor voltage is derived from the weld voltage, so if you lose, the weld voltage, the motor will not turn. Feed some wire out in a setting that works, then switch to one that doesn't feed, and see if the wire will arc. If you have a voltmeter, check for DC voltage at the polarity changover. Might be a bad voltage range switch.
What Battery does my Miller Bobcat welder take I cant find any markings
The original battery is rated 430 cold cranking amps and 75 amps reserve Group 58. What I have found locally in that group size are: one with 850 cca, one at 700 cca, and one at 550 cca.Bobcat 250 Battery.
this is all I could find out.
http://www.millerwelds.com/resources/communities/mboard/forum/welding-discussions/33890-bobcat-250-battery
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