miller 350p push pull guys help.

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So im a pretty exp welder but im having some issues and im wondering if anybody else has had similar. First gen 350p board replacement in the past month. 035 5356, edge push pull gun 20ft ish whip new liner etc. Now i for the life of me cannot get this thing to feed right at all really bad feeding in pulse mode and very inconsistant. It will run smooth for a bit then the wire will slowly, or quickly just burn back and stick in the tip then wad up in the machine drive rolls. It is so frustrating that i have abandoned the push pull and am using just the std. Miller gun in std mig mode. Its the onlyWay it works. Oh and ive played around with run in speed thats set at around 75 80 the sharp and arc length ive messed with but it wont feed long enough to notice much other than the sound.
Reply:I've used a Python gun on our 350P at work but I used  .045 wire. It was a bit of a pain to get it set up but once it was set it worked fine. You are slacking off the feed rolls in the machine like you're supposed to? The guide from the spool to the drive rolls in the machine isn't full of crap? A sharp edge somewhere scraping off the aluminum? Can you get a Teflon liner for the gun? Going by memory as it's been awhile since I used it, isn't there some adjustment you have to make to calibrate the gun to the machine so the feed speeds are synced?The reason I ask is that it sounds like the same symptoms when I was trying to run aluminum thru my steel liner at home ( totally different machine) . It's feed great for a bit and then burn back for no apparent reason, aluminum on steel doesn't work too well, at least in my experience....Mike
Reply:@ jesusno2 - have about an hr of run time/experience with a 25ft Python gun w/ 0.045" Al wire on a Lincoln 350MP.  Are the correct drive rollers installed in the 350P?  You want the smooth (machined) "U" rollers for Aluminum.  The knurled "V" grooves are for flux-core.  Have you blown out the (new) liner to free any potential internal debris?  Drive roller tension adjusted correctly?  Any shaving of the Al wire, from say a sharp edge at the gun's interface to the machine, may result in bird-nesting of the wire in the rollers during feeding and cause micro-arcing.  Will check with a few buds running p/p guns on their Millers and see what they say. Keep working to get her dialed in.  Once she's set, you will love using the push-pull rig!Last edited by ManoKai; 09-21-2013 at 08:07 AM."Discovery is to see what everybody else has seen, and to think what nobody else has thought" - Albert Szent-Gyorgyi
Reply:Did you resync the motors?Weld like a "WELDOR", not a wel-"DERR" MillerDynasty700DX,Dynasty350DX4ea,Dynasty200DX,Li  ncolnSW200-2ea.,MillerMatic350P,MillerMatic200w/spoolgun,MKCobraMig260,Lincoln SP-170T,PlasmaCam/Hypertherm1250,HFProTig2ea,MigMax1ea.
Reply:Check the tension on your pull wheels. They might be slipping, blob on teeth, or arcing on teeth. Check and replace or rework if necessary. I have had to do that even though I am running .045 5356..035 size wire is more suited to a 12 or 15 foot torch.Weld like a "WELDOR", not a wel-"DERR" MillerDynasty700DX,Dynasty350DX4ea,Dynasty200DX,Li  ncolnSW200-2ea.,MillerMatic350P,MillerMatic200w/spoolgun,MKCobraMig260,Lincoln SP-170T,PlasmaCam/Hypertherm1250,HFProTig2ea,MigMax1ea.
Reply:Yea i have little to no tension on the machine drive rolls says set em at below 1 setting in the manual it does have the U groove rolls also and it has the teflon liner everthings new exept the drive rolls. But i didnt know their was some kinda timing issue how does that work.Last edited by jesusno2; 09-21-2013 at 01:18 PM.
Reply:I don't have the manual in front of me and can't find one on-line. If you don't get a reply by Monday I'll find the one at work and get back to you....Mike
Reply:Thanks mike i googled myself silly trying to find info but havent found anything about syncing the drive rolls. I have the manual at work also i dont remember seeing anything about it.
Reply:Originally Posted by jesusno2Thanks mike i googled myself silly trying to find info but havent found anything about syncing the drive rolls. I have the manual at work also i dont remember seeing anything about it.
Reply:I have the manual at work also i dont remember seeing anything about it.
Reply:I have had similar issues. Liner, drive rolls and cleaning did not help the problem.  If you are using a large spool of wire try loostening the spool tensioning nut to just finger tight.  It worked for me and all my burnback issues were solved. Saves a few bucks on tips also.
Reply:Originally Posted by DimeI have had similar issues. Liner, drive rolls and cleaning did not help the problem.  If you are using a large spool of wire try loostening the spool tensioning nut to just finger tight.  It worked for me and all my burnback issues were solved. Saves a few bucks on tips also.
Reply:I gotta look into this sync thing. Cause i took the nut all the way off the tension spring for the wire spool.
Reply:Originally Posted by jesusno2I gotta look into this sync thing. Cause i took the nut all the way off the tension spring for the wire spool.
Reply:Page 39 of the manual:To obtain the most accurate calibration, set up the welding power source in the MIG welkding modeOpen all drive rollsSimultaneously press setup ans arc control buttonsRotate left knob until MCAL is displayedRotate right knob until YES is displayedPress and hold gun trigger. Wire drive speed will be overidden to 50 ipm for 12 seconds and then to 600 ipm for 12 secondsWhen CAL DONE appears on the disply release gun triggerDATA SAVE will appear on the display while the calibration dytat is being stored in the control board memorySetup push-pull torque Simultaneously press setup and arc control buttons while turning on the powerleft knob to find the particular item, right knob to change the settingSetup push motor torque:this feature is only active when a push/pull gun is connected to the power source. The SUP setting will adjust the over torque limit of the push motor inside the power sourcr. the range ia 0-250 and the default value is 130. Increasing this setting will increase the over torque limit and speed up the remote wire feed motor. If the aluma -pro gun has a listed SUP value, set the power  source to match this value.To save settings and exit the SUP menu depress the gun triggerReset (rES) To reset to factory values, rotate the right knob to select ON. Press and release gun trigger to reset system to factory defaults.....Mike
Reply:Originally Posted by mrmikeyPage 39 of the manual:Setup push-pull torque Simultaneously press setup and arc control buttons while turning on the powerleft knob to find the particular item, right knob to change the settingSetup push motor torque:this feature is only active when a push/pull gun is connected to the power source. The SUP setting will adjust the over torque limit of the push motor inside the power sourcr. the range ia 0-250 and the default value is 130. Increasing this setting will increase the over torque limit and speed up the remote wire feed motor. If the aluma -pro gun has a listed SUP value, set the power  source to match this value.To save settings and exit the SUP menu depress the gun triggerReset (rES) To reset to factory values, rotate the right knob to select ON. Press and release gun trigger to reset system to factory defaults.....Mike
Reply:So today i had the chance to mess around with the 350p i did find the MCAL function and switched the knob to YES. And pulled the trigger. My machine does not do a calibration mode apperently , soon as i pulled the trigger some random weird #'s come up and then it goes into jog mode.  I  tried it several times any ideas this is the first gen 350p even my manualis different on page 39.
Reply:I'm having hell with mine at school too. Pulse mig sux! I'm about to take a zero and move on to carbon steel.One thing that seems to help is resetting the machine and making sure you have the right gun setting. Ours is a python and it sux btw...
Reply:Sorry, I'm out of ideas, here's hoping someone else will have some....Mike