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Transmission Discussion of preventative/corrective maintenance and other technical issues regarding your coach's transmission.

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  #1  
Old 05-08-2010
ERay ERay is offline
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Default Transmission Temps

I was driving across GA yesterday on the west side going to Macon... I noticed mt Transmission temp was between 225 and 250... it stayed there till I got into some hills and went up to 275... when I got in heavy traffic it went to 300 and stayed there till I parked... I let it idle to cool down the engine but the trans temps stayed at 300... I just had a new sending unit installed and the gauge is new... and ideas or suggestions... what should the normal temp be
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1998 Wanderlodge LX (the 1st one)
Full Timing and Loving It
"Heads Carolina, Tails California"
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Old 05-08-2010
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Thomas Rembert
 
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That's way too high in my book. ATF breaks down rapidly at 250 and above.
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1993 WB40
1997 WB43
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Old 05-08-2010
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Thomas Rembert
 
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Found this on a fire truck site.


ATF manufacturers suggest that for every 20oF. increase
in operating temperature above 175oF., the life of the fluid
is cut in half. Hence at 195oF., oil life will be about 50,000
miles. Above 240oF., it becomes nil. Without adequate
cooling, the heavy duty use of wildland fire engines will
likely push the ATF operating temperature very high.
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1993 WB40
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2018 Allegro Bus 45ft 4 slide
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Old 05-08-2010
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warbucks13477 warbucks13477 is offline
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Eray before there is any panic a question is in order. What were your temperatures BEFORE you replaced the sender and gauge? And did they place the sender in the same place as the factory gauge? I have a feeling that you have a mismatched gauge and sender but if not you have a serious problem and need to find the problem now. Here is another suggestion on tranny temperatures
http://www.digi-panel.com/digidevicesweb/trannyoil.htm

For those that want to be alerted LOUDLY I would suggest installing a digi-panel to monitor your tranny temp, oil pressure,battery voltage and engine temp. Its good insurance for $214.
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Old 05-08-2010
ERay ERay is offline
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I just spoke with the shop supv at Allison in Jackson GA... he walked me through the dignostics using the arrows... it showed no codes... he seems to think about what you did Tom... it may be a mismatch... I will be here for 3 weeks so I think I will run it over and have them to put it on the computer
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1998 Wanderlodge LX (the 1st one)
Full Timing and Loving It
"Heads Carolina, Tails California"
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  #6  
Old 05-13-2010
ERay ERay is offline
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Tom you seem to have hit the nail on the head... I left at 7 am today and drove to Bleakley RV (70miles)... WW Williams (Allison Dealer) has a shop there too... Chris the shop supv checked out my tranny... I was reading about 250 degrees on the guage but his computer said it was at 159... we did a power brake thing and my gauge read 275... the computer didnt hit over 160... he called Allison and it came back that the sending unit and the gauge may not be matched... I ordered new ones to match

Will keep all posted... thanks Tom and all for the input and feed back

BTW... Chris at WW Williams is a PRO... if you pass by there and want a computer scan on your allison he is the guy to see
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Full Timing and Loving It
"Heads Carolina, Tails California"
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