Any truck enthusiasts out there? - Mercedes-Benz Forum

 
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post #1 of 8 (permalink) Old 08-10-2009, 07:40 PM Thread Starter
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Any truck enthusiasts out there?

Hi. I'm having a heck of a time finding any source of info on my L1117 medium duty truck. Does anybodyy know of a source for truck manuals? I need to know how the exhaust brake is supposed to work. It seems to be interfering with the normal action of the throttle. Has anyone seen one of these? The weird thing is that these units are usually activated manually, such as when the truck is descending a steep hill. My truck's unit seems to be solidly linked to the throttle! Thanks in advance for any ideas.
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post #2 of 8 (permalink) Old 08-10-2009, 11:15 PM
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Is it a 678 "something" vehicle? The data should be available from workshop documents equally as for cars although a service DVD probably does not exist for private use. Can you access WIS on-line?
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post #3 of 8 (permalink) Old 08-11-2009, 12:04 AM Thread Starter
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Hi there! I'm not familiar with a description like '678 something'. Maybe this was a family of models. For example, the COE GMC 7000 trucks were also refered to in service literature as belonging to the W5 series. However, more importantly, I am also unfamiliar with the WIS site; more than likely it is not accessible to me. The frustrating thing is that although uncommon in North America, these trucks were as common as dirt in other parts of the world. The MB dealer/service network, Freightliner, at least where I live, either has no service info, doesn't know how to access it or just doesn't want to share it. Many thanks for you interest!
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post #4 of 8 (permalink) Old 08-11-2009, 03:04 AM
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Posting the location and exact model year would be good start to get some general advise even when nobody on this forum owns that particular vehicle.
Exhaust brake can be a commonly know Pac brake, what is a flap on the exhaust, or engine brake reversing the engine by resetting valves.
Some vehicles have them automatically activated with gas pedal up, some have additional switches. None should work with the gas pedal pushed, although there are systems that apply them on cold engine to speed up warming.
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post #5 of 8 (permalink) Old 08-11-2009, 09:47 AM Thread Starter
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Kaitek, you are q
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post #6 of 8 (permalink) Old 08-11-2009, 09:54 AM Thread Starter
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Kaitek, you are exactly right, the exhaust brake on my L1117 is designed to open with the openning of the throttle via parallel linkage, unlike some more modern systems that operate with servo motors of various kinds. The problem is there is something out of joint that won't let the throttle open without resistance. I removed the cable which holds the throttle open for the sake of the PTO, thinking it might be binding, and yes, I was clutching at straws, but it didn't help. Its a simple system but I can't see it so that I can understand it. That's why I need a diagram. Thanks for your interest.
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post #7 of 8 (permalink) Old 08-14-2009, 02:28 PM
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I'm not completely sure this is what you're looking for, but this website offers a service repair manual for your truck

Books4Cars.com - Every Repair Manual, Service Manual, Owners Manual and Book for your Car, Truck and Motorcycle

scroll down and you'll see it. hope it helps!
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post #8 of 8 (permalink) Old 08-14-2009, 03:37 PM Thread Starter
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Wow, I can't believe it. All my searching on-line and no result.....and then, bang, there it is.!! Many, many thanks for bringing that to my attention. And thanks also, so much, to ALL those who helped.
Allan
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