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Allison over full
Good morning everyone!,
I pulled the stick out on my Allison and noticed it was “way” over full according to the dip stick. I wiped it off and checked again and it was the same. Everything was cold but the level was way over the “HOT” mark. I have never added any to it and I don’t know if Jeff checked it when I was there. We did look under it to see if the transmission had been serviced or not and it had. I have no leaks and nothing is blowing out anywhere. Is this something I need to address or is this a non issue.
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26 Replies
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Ignore the stick. Bring the transmission up to operating temperature and use the transmission shift pad to check the fluid level.
http://http://www.beaveramb.org/PDF/PDF%20Manuals/allisoninformation/Allison%20Transmission%202.pdf
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As Jon said bring it up to temp and at normal idle push both up and down arrow if it displays 7-0 the transmission is not up to temp. Once it is up to temp it will go through a countdown and give O-L O-K or O-L L-(a number) or O-L H-(number)….
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Jon,
Thank you for the manual, I am going to assume this is the Allison that is in my 99 coach or you would not have sent it!
Jeff,
Am I looking at the display on the transmission selector where it shows what gear your in etc? Just a normal idle in N is the best way to bring it up to temp?Fella’s I really apprecieate your help!! What would we all do without you and Prevost Comunity?? I know… Without, thats what!!
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I just grabbed any Allison manual but the codes and procedures listed apply to yours which I think is a B-500.
Drive the coach or to heat it up idle it in gear with the brake on. Or if you want back up my driveway. That heats up a transmission.
The shift pad is where you will see the display. As Jeff says, transmission in neutral, idle speed, press the two arrows simultaneously and after a countdown it will display if the oil is OK, low or over full Do it on level ground and it is more accurate than the stick which is all but impossible to read.
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After getting it up to temp you have to let it idle a couple of minutes before you check it on the shift pad, right?
Davy
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That depends on the temperature. When driving the transmission tends to match the engine temperature and I believe if the oil level is checked when it is at that temp it will give you the code that the temp is too high.
I think the best time is after driving a while, pull into a rest area, go to the bathroom with the engine idling and after a few minutes start the fluid level check. That is how I do it and only once did I get the high temp code and I had to wait a few more minutes. Another good time is after refueling because the coach sits for a while and cools off a little. I don’t check it after a start because it takes forever to get to temp if I am not driving. It is a good post trip check because checking into a campground takes time.
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Jon,
Do you have a 50 ton wrecker up at the top of your hill to pull the old antique busses like mine up there? From the pictures I have seen, I would say she would warm right up backing up there!!
The buss is sitting in my new airconditioned bus barn setting at a cool 75 degrees. I probably would have to let her Idle in gear a while to warm it up. I will probably take your advise about checking it on my next adventure!Thanks everyone for the help!!
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Don’t delay on your next outing. An overfilled transmission tends to run hot. I believe you have an intercooler which will help control temps.
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It has been running nice and cool, other than when I am using the retarder.. At least the gauge says so.
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Nice and cool shop……When do you set my A/C on my shop? It will warm up in about 10 min in drive however I do not recommend torquing it to warm it up quicker…just foot off accelerator in Drive…then you can check it sooner…
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Steve, in that nicely cooled garage don’t forget to open the doors and windows while idling to warm up the trans temperature. That will let the diesel dust excape without doing bodily harm to you. Of course that nicely cooled 75 degree air will also excape making you warmer too!
The above will be true unless you happen to have one of those flexible hose thingies that go thru a hole in the garage door to put all that diesel dust into the atmosphere.
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Jeff,
Would
you like me to bring a crew with me on my next visit? I am sure we could
work out a trade. I could do a system just like mine…..Carole &Will,
I guess I will have to back her out the door a bit and loose all
that cool air! Since I have blew my budget on my new bus shed, the
Monoxovent system will have to wait a bit!!!
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Very nice Steve and Shari,
Bill S.
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Jeff,
the pad says O L. 5 9.Can an you translate ?
thanks
Steve
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Steve,
I believe the code OL 59 is for engine speed to high. So perhaps you are not at idle rpm.
Hope this helps as this check works great on my 4060R trans.
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