Bobcat 225g solenoid issues

[thomas1]

I picked up a 225g that doesn't want to idle correctly. When I switch from run to run/idle I'm not getting any change. I'm fairly certain my issue lies in the solenoid as I have power where I'm supposed to at the ICM.

I seem to have a bind in my solenoid alignment which I haven't been able to adjust out, yet. With the solenoid removed all the throttle linkage moves freely, once I reinstall it and snug down the screws that hold the bracket to the engine tin I get a bind.

Also, is it possible for a solenoid to get weak? With the mounting screws removed if I apply 12v to the solenoid it will only draw in the last 3/8" of travel, if it is extended any more than that it won't make the jump.

[walker]

As I recall, you can pull the solenoid apart and clean it out, try that, and if it still doesnt work, then replace it.

[thomas1]

As I recall, you can pull the solenoid apart and clean it out, try that, and if it still doesnt work, then replace it.

Apart, as in disassemble the solenoid itself?

Or, pull the plunger and clean that and then clean the inside of the solenoid tube? That I have done.

I did notice that all the manuals seem to show the plunger mounted to the top of the governor arm. My is not that way. My plunger has a a notch in it and the governor arm is currently in this notch. That would seemingly put my plunger in around a 1/4" lower position.

[cruizer]

What I do is unbolt the solinoid case ,clean the plunger and case, reassemble. Now its more than likely not the issue, its likely the idle module giving the problem. For that, you have to remove the top case. its a rectangular plastic thingy

[thomas1]

What I do is unbolt the solinoid case ,clean the plunger and case, reassemble. Now its more than likely not the issue, its likely the idle module giving the problem. For that, you have to remove the top case. its a rectangular plastic thingy

I checked the ICM per this post. http://www.millerwelds.com/resources...502#post263502

Should the solenoid pull the plunger in from the fully extended position? With the machine running in the run/idle position, I can manually push the plunger in and it will stay at whatever position I set it to and I can't pull it back out until I drop power to the solenoid.

Thanks for your help.

[cruizer]

If thats the problem, adjust the solinoid case so that more of the center plunger is inside the case

[thomas1]

If thats the problem, adjust the solinoid case so that more of the center plunger is inside the case

Do you have an idea of the normal plunger travel amount?

[thomas1]

Am I correct in that the solenoid only controls the change from run speed @3700rpm to idle speed @2250rpm? So, no matter what, the lowest engine speed you should see is 2250rpm?

[cruizer]

Yep, high/low idles. Though I go by generator frequency to determine engine speeds, so 44 hz low, and 62.5 hz high

[Aeronca41]

Engine Speed Setting

Yep, high/low idles. Though I go by generator frequency to determine engine speeds, so 44 hz low, and 62.5 hz high

Cruizer, are those frequencies also good for my TB 280NT S/N LB022511, Onan P220? I'm guessing they would be, but always better to ask.

[thomas1]

Yep, high/low idles. Though I go by generator frequency to determine engine speeds, so 44 hz low, and 62.5 hz high

Perfect, thank you.

[thomas1]

It turned out to be the plunger alignment, causing enough of a bind to not allow the solenoid to work properly. I moved the plunger above the governor arm, like it's supposed to be, it works like a champ.

Now to set my speeds and see if there are any more issues.

Thanks to all who replied.