need some help

admin

I have a lincolon classic III and when i strike my rod it takes a moment for the machine to idle up. When she does it variates RPM's before finding where she wants to be.When the machine is cold it idles up and down properly other than the RPM variation, but when she warms up it idles up slowly.  Hoping someone could help. Please.
Reply:Only a guess but it could be the electric solenoid.On these the solenoid is a "rev-up" solenoid.  Current is applied which creates a magnet inside of it that draws the throttle plunger in.  If corrosion is in there then it starts acting funny.  They are easy to take apart.  Remove the throttle rod and slide out the plunger.  It's probably rusty and so might be the hole.The other problem with these is the fact they do get hot when you weld for a long time.  The electric is applied to make it pull-in and this current makes the solenoid hot.  A 2 stage solenoid doesn't have this problem I believe because a 2 stage uses the big current to pull it in then once in it uses the second stage which has lower current to hold it there.  Single stage solenoids (like mine is) uses only the big current so it eventually builds up some heat.  I noticed all this with my 200d Perkins.  It would rev-up ok when the solenoid was cool, but once the solenoid got hot it lost most of its pulling power which made me loose rpms.  Even parking on a small side hill would effect it's rpms because of the added weight of the throttle rod I guess.One sure fix, the one I used on that machine from almost day 1, is the old bungee trick.  Bungee the sucker open and leave it there. haha.  Crude I now, but effective. lolGood luck manLast edited by slowhand; 10-28-2010 at 07:43 PM.
Reply:I really appreciate the help. That was going to be my next step. Thanks again