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Old 08-22-2013, 06:25 AM   #1
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Transmission Temp

First off, thanks to all the forum contributors so willing to share knowledge. It's great for this motor coach newbie to have access to so much experience all in one spot!

We're still trying to get up to speed with our new-to-us 2008 Berk 360 QS with the Mercedes engine. Yesterday, while moving the coach across town, I brought up the transmission temp option in the display for the first time. The 147 degree reading caught my eye. Outside temp was around 90. What is the normal range for transmission temperature?

John
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Old 08-22-2013, 06:43 AM   #2
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at 147 all is OK.....see chart
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Old 08-22-2013, 06:54 AM   #3
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My Allison runs 150 not towing after a 40 mile trip.

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Old 08-22-2013, 07:03 AM   #4
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John,

I have your same rig, Mercedes powered. 147 is cool. If you tow in 90 degree, you'll see it edge up well past that. Some tips in the Allison manual you should pay attention to. Don't let the engine lug, downshift. Helps engine and trans temp. If stuck in traffic, slip it into neutral. Don't be afraid to "tell" the transmission what to do.

Just for FYI - watch your engine temp closely. Last month we experienced a failure of the blower fan for the motor. It gets hot very quickly. I had heard a whistle from the engine compartment a few days before the fan failed. Stay tuned into those things. The engine WILL detune when it gets hot and that is scary running down the road.

Enjoy your new to YOU toy. We love ours.

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Old 08-22-2013, 07:13 AM   #5
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Trans temps usually run about 70-90 degrees above the ambient temps.
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Old 08-22-2013, 07:17 AM   #6
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I think that you have to be careful with "generalisms". The posted chart is becoming dated. Many new vehicles run at much higher temperatures normally. For example, my F150 runs at 195 to 197 degrees normally.
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Old 08-22-2013, 07:32 AM   #7
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Quote:
Originally Posted by acadianbob View Post
I think that you have to be careful with "generalisms". The posted chart is becoming dated. Many new vehicles run at much higher temperatures normally. For example, my F150 runs at 195 to 197 degrees normally.

X2

ATF+4 has an optimal operating range of 160-220. Anything below and the oil isn't providing the appropriate lubricity levels. Anything above and the oil quickly breaks down. It is also important to hit the higher temps as many of then newer vehicles do to make sure to burn off any condensation within the oil from starting and stopping which putting the oil through hot and cold periods. Mine will run 100 degrees above ambient up to 100 degrees then holds pretty close to 200 on the trans temp and only down to about 160 on the low end as my normal numbers.
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Old 08-22-2013, 07:39 AM   #8
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My normal trans temp is 190 empty. Towing 17k 210 degrees
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Old 08-22-2013, 08:14 AM   #9
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My normal trans temp is 190 empty. Towing 17k 210 degrees
I know that the 7.3 Diesel Powerstrokes 1999-2003 should run about 70 degrees above ambient temps. I shelled my transmission from running it too hot for too long. The suggested solution was to buy a bullet proof transmission with a life time warranty Brians Truck Shop and replace the 7.3 trans cooler with a 6.0 trans cooler which I did.
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Old 08-22-2013, 07:02 PM   #10
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Originally Posted by JohnKen View Post
First off, thanks to all the forum contributors so willing to share knowledge. It's great for this motor coach newbie to have access to so much experience all in one spot!

We're still trying to get up to speed with our new-to-us 2008 Berk 360 QS with the Mercedes engine. Yesterday, while moving the coach across town, I brought up the transmission temp option in the display for the first time. The 147 degree reading caught my eye. Outside temp was around 90. What is the normal range for transmission temperature?

John
Berkshire 360QS normal temps for the transmission will be from about 140 to 170. I have never seen more than 173 on mine towing my toad in 104 degree temps going through Mount Washington area.
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Old 08-23-2013, 08:02 AM   #11
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My normal trans temp is 190 empty. Towing 17k 210 degrees

The 210 degrees seems high to me, but I run a different engine.

Have you ever visited this Forum to talk to your year of Ford owners and compare. Ford Truck Enthusiasts Forums - Ford truck and SUV owners and enthusiasts Community And Information Source.
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Old 08-26-2013, 08:25 PM   #12
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The 210 degrees seems high to me, but I run a different engine.

Have you ever visited this Forum to talk to your year of Ford owners and compare. Ford Truck Enthusiasts Forums - Ford truck and SUV owners and enthusiasts Community And Information Source.

Just got back from a trip and it is high. 180-190 normal towing the 27.5K rig, up to 210 going up 6%+ grades (Lots of those here in CO).

Don't know what it runs with no load as I don't normally use it for anything but camping!
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Old 08-26-2013, 08:45 PM   #13
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My normal trans temp is 190 empty. Towing 17k 210 degrees
The Alison in the pickup temp varies and climbing hills can run it over 200. Over trans temp 200 the fan pitch will change to increase cooling.

Normal flat towing, the temp is 170 -190.
Rain can drop it in the 160 range.
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Old 08-26-2013, 10:08 PM   #14
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Not sure how the Berkshire's two transmissions compare with the pick-up temps but mine is the 2500 in a RB 340 and if the temp creeps up I am usually in the wrong gear.
I also use simple green to clean the radiator and the transmission cooler. I always surprised how much crud come out. I will say I have only had mine one year and only around 9000 miles so not a expert at all here.
All the newbies take a look at Camp Freight Liner. It's a two day class at the service center in SC. It's also the best place to get your yearly service done and done correctly. They will answer questions all day and night. Most bring their spouse and I think that would. Be a big help.



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Old 08-28-2013, 08:51 PM   #15
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Check this out, assuming you have an Allison transmission:

Former Allison Transmission Fluids Engineer (Mr. TranSynd) - Page 40 - Chevy and GMC Duramax Diesel Forum

HZJCM8 was the fluids engineer at Allison Transmission before he retired. He has some really good information on the Duramax site pertaining to the Allison transmission. Looks like 147 is nothing for this transmission.
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Old 08-30-2013, 04:51 PM   #16
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Finishing up our trip to Arkansas. We camped at Petit Jean State Park and it was a hilly, kinda mountainous drive up to it. My trans temp stayed between 194 and 205. No toad.
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Old 08-30-2013, 05:19 PM   #17
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transynd has a flashpoint of 450 degrees according to hzjcm8. sounds like 210 would be no problem for a short amount of time.
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