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Old 07-03-2007, 06:02 PM   #1
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I have a CAT C7 and Allison 6 speed Transmission. On our recent trip, we twice arrived at camp to find our toad covered with transmission fluid? The transmission never ran over it's stated normal operating temperatures (140? to 220?), highest if ever got was 214?. I also read in the manual that it is not considered overheated until 250?. In addition, I often checked the fluid level using the transmission control panel and always found the level to be "OK" for the entire 3 week, 4,011 mile trip. Anyone else have this experience? Is this something I have to live with, or is there something to be fixed here?
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Old 07-03-2007, 06:02 PM   #2
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I have a CAT C7 and Allison 6 speed Transmission. On our recent trip, we twice arrived at camp to find our toad covered with transmission fluid? The transmission never ran over it's stated normal operating temperatures (140? to 220?), highest if ever got was 214?. I also read in the manual that it is not considered overheated until 250?. In addition, I often checked the fluid level using the transmission control panel and always found the level to be "OK" for the entire 3 week, 4,011 mile trip. Anyone else have this experience? Is this something I have to live with, or is there something to be fixed here?
Thanks,
Alan
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Old 07-03-2007, 06:07 PM   #3
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Alan,

When I took mine in for the tranny 5K mi. main oil filter change, the tech told me that the tranny does not use or burn oil. So if you are losing oil, and more importantly seeing it all over your toad, you definitely have a leak. Get it in to an Allison shop and have it checked out.

Good luck!
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Old 07-03-2007, 06:23 PM   #4
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What's odd is the fluid level never seems to change. So the amount spewing out cannot be much. But that's good to know that it doesn't happen to you. I need to get it in to Allison and see what they have to say.
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Old 07-03-2007, 08:39 PM   #5
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Alan,,,,ae you sure your jacks or slide lines are not leaking....they use trans fluid also...just a thought...RKL
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Old 07-04-2007, 04:03 AM   #6
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No, I'm not positive, I've thought of that as well, but it happens while driving when the slides are not being operated? Is there any way that coule make sense?
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Old 07-04-2007, 04:10 AM   #7
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Are you sure it's trans fluid? Occassionally my C-7 pukes out a bit of diesel from the slobber tube all over my toad, always when I'm in a hurry to get unhooked and need to be somewhere.

Mine seems to occur when I'm close to a freeway and the engine doesn't warm up much before accelerating rather hard to merge into traffic.

Keep us posted in what you find.
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Old 07-04-2007, 04:19 AM   #8
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You've also got ATF in the power steering reservoir/system so that is another potential source. Do you see any oil/fluid in or near your engine access area? Any fluid on or near the fill cap for the power steering reservoir?
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Old 07-04-2007, 04:50 AM   #9
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Could the rear slide be leaking and the leaked fluid be trapped by a frame member, then blowing off on the toad when you drive?

As for the power steering reservoir - does that normally vent a minor amount of fluid? The fluid level in mine never changes and it doesn't get on my toad, but it's always filthy on top. I clean it often and still it's always a mess.

Doug makes a good point - be sure it's ATF. C7s, especially if overfilled, are known to blow oil out the vent. Mine has never done that, but I see reports of it all the time.
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Old 07-04-2007, 07:16 AM   #10
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If you're adding fluid are you using the proper method to check your fluid level?? You may be overfilling.

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Old 07-04-2007, 07:47 AM   #11
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The power steering system is a possibility. What is the plastic reservoir on the top right in the engine compartment? It's above both the oil and trans fill tubes. This is a filthy mess, so I suspect it is coming from that, whatever it is. Also, there is trans fluid on the back of the motorhome as well, like on the engine area vents, leading me to believe it is coming from something toward the top of the engine/radiator area. I would have thought if it was coming from the transmission, that is would be coming out more from the bottom of the coach, unless that reservoir was for the trans? Anyone now for sure what that reservoir is?

Also, as far as oil vs. trans fluid, it is definitely red trans fluid. What little blow by I get from the C7 doesn't seem to stick to the toad.
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Old 07-04-2007, 09:31 AM   #12
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Alan - that reservoir on the top right is the power steering. That's the one that's always grimy on mine too. It must put out a mist or something. I don't really lose fluid, but it puts out enough to attract all available dirt!

There is a transmission fluid cooler somewhere behind (forward of)the main radiator. Maybe that's where your leak is. Seems like you would see some evidence of it on the radiator fins though...
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Old 07-04-2007, 12:07 PM   #13
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Are you absolutely positive it is tranny fluid? Did you crawl under and search for the point most forward that is 'oiled'? Like ChippySgt says I would suspect the slobber tube.
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Old 07-04-2007, 08:16 PM   #14
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Alan, I had the same exact problem on my new 2006 Journey with only 3500 miles on it. I would get a fine mist of oil all over my toad after towing. The oil was coming from the power steering reservior cap vent. At the same time I started to get a moaning noise from the power steering up front while driving. After taking it to Freightliner with no answers I called the factory representative. Please read this post.Sammie
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Posted May 28, 2007 11:01 PM Hide Post
Freightliner for some reason has installed an inline power steering fluid filter about 18 inches below the reservoir on 2006 and some 2007 chassis. It's about the size of a small beer can. This filter has a tendency to collapse internally causing fluid flow restriction and premature pump failure. I had noisey power steering in the beginning but after talking to a Freightliner factory Representative I was able to get the filter removed and after returning from a 1000 mile trip all seems fine. If you have noisey power steering get it checked out now. It just might save you from getting towed while your on a nice vacation. This is a serious enough problem that I cannot imagine that Freightliner does not issue a recall. My fix was covered by warrenty but I had to be persistant.

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