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-   -   77 300D Cruise Control (http://www.peachparts.com/shopforum/diesel-discussion/172451-77-300d-cruise-control.html)

Moorewr 12-05-2006 01:56 PM

77 300D Cruise Control
 
Anyone have any experience with the cruise control on the early W123, can on left front wheel well? Think mine has a bad diaphram, any help, thoughts?
Ron

rgnprof 12-05-2006 02:50 PM

I went through mine a few months back - tested everything and it turned out to be the amplifier. The 'can' should hold a vacuum - pull about 15-20 psi with a mighty vac and see if it holds - you should be able to see it pull and hold the throttle open thru the cruise control cable. If I remember right I had to run 12 volts to the connector - from the battery - to turn the cruise on, and then I pulled the vacuum. It should hold. You can also undo the screws and take a peek at the rubber diaphram - not hard to get to.

Ryan

Moorewr 12-05-2006 07:20 PM

Ryan thx
Ron

Perkinsguy 12-05-2006 08:43 PM

123 and 107 and 124 and and.....are notorious for failed CRUISE CONTROL......If unless you have big pockets, live without it!:kid:

cconbalsam 12-05-2006 11:29 PM

on my 123 the cruise works fine until you roll the window down. then it kicks it out of cruise. What's the deal?

JimmyL 12-05-2006 11:49 PM

Quote:

Originally Posted by cconbalsam (Post 1349755)
on my 123 the cruise works fine until you roll the window down. then it kicks it out of cruise. What's the deal?

Keep the window up.....;) :D

Do these vac. cannister type have a cruise amp? It appears similar to the style on my '79 Chevy PU.

rgnprof 12-05-2006 11:52 PM

My cruise works great - I bought a rebuilt amplifier (which I have discovered is usually the problem) from a company in Georgia for a reasonable price and it has worked fine since - link below.

http://www.benz-store.com/index.htm

Ryan

JimmyL 12-05-2006 11:55 PM

Quote:

Originally Posted by rgnprof (Post 1349776)
My cruise works great - I bought a rebuilt amplifier (which I have discovered is usually the problem) from a company in Georgia for a reasonable price and it has worked fine since - link below.

http://www.benz-store.com/index.htm

Ryan

Thanks for link. You really should put your car type in your signature, so we can tell what you are referring to.


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