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#1
06-02-2011, 06:15 PM
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ACC servo in a bind...
Well, my servo works sometimes... Seems that when I test it in the garage all is well. It changes to heat, back to cool etc. It's really a cool system... when it works...
 Problem is, when I drive it and get everything up to temp it'll crap out. It's OK as long as I leave it on AC but when any input is given to the servo motor the amp overheats and falls on it's @ss... Today I decided to check it out. Same thing... I did notice that when I loosened the screws holding the middle plate (Not the dome on top) that the servo started working. Seems like something is getting in a bind (Probably the gear works or valve) once it gets hot and making the amp overheat. I guess I'm going in again... Any advise? I know most folks are scared to death of the trolls and unicorns inside of ACC servos but I'm OK with it...
__________________
My occupational hazard bein' my occupation's just not around... 1980 300SD 1980 300SD 
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#2
06-02-2011, 08:07 PM
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__________________
"Life is tough...it's even tougher if you're stupid." John Wayne Dave Pawleys Island, SC '79 300CD
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#3
06-02-2011, 08:25 PM
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I have it printed out and some of it helped me to get the system working as well as it is.
I think the trouble is that the main gears/servo motor are mounted to a flimsy plate which isn't very solidly located in the housing. Add to this the fact that the feedback potentiometer is screwed to a separate plastic part and the valve is in another part underneath all that. It's like a sandwich sandwich with extra sandwich... Mine is cracked and I think it has the parts locations all screwed up and the servo is dragging. It works but when it gets hot it overloads the servo motor Just a little drag will overheat the amp pretty well.
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My occupational hazard bein' my occupation's just not around... 1980 300SD 1980 300SD Last edited by 1980sd; 06-02-2011 at 08:26 PM. Reason: Spelled sammich wrong...
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#4
06-03-2011, 02:33 AM
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Grab you one of the aluminum body servos from the junkyard. I see them frequently. They are usually very sturdy and need only a calibration check....Robert
__________________
 Did you just pass my 740 at 200 kmh in a 300SD?????1978 300SD 'Phil' - 1,315,853 Miles And Counting - 1, 317,885 as of 12/27/2012 - 1,333,000 as of 05/10/2013, 1,337,850 as of July 15, 2013, 1,339,000 as of August 13, 2013 100,000 miles since June 2005 Overhaul - Sold January 25th, 2014 After 1,344,246 Miles & 20 Years of Ownership 
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