Sausage Posted August 27, 2018 Share Posted August 27, 2018 I have a 07 mack cl700 dump I've been having issues shifting into low range it will grind and not move I have put over 10,000 dollars into this truck over last week or so new Tranny new shift selinoid and new shift handle and still having same issue has anyone else had this problem and if so what was the cause it's an 18 speed Tranny Quote Link to comment https://www.bigmacktrucks.com/topic/54136-tranny-hi-low-issue/ Share on other sites More sharing options...
fjh Posted August 27, 2018 Share Posted August 27, 2018 Please clarify is the trans NEW/Reman? Or did you replace the range valve on the top of the Trans? Does the Truck Have A cummins or Mack Engine Eaton or Mack 18sp ! Mack !!!!! Check to see that the out put yoke is tight!!! If it has a cummins and a mack trans the loose yoke issue becomes more complex! Quote Link to comment https://www.bigmacktrucks.com/topic/54136-tranny-hi-low-issue/#findComment-404985 Share on other sites More sharing options...
Sausage Posted August 27, 2018 Author Share Posted August 27, 2018 It's a Cummins not to sure about the details of truck as I am the driver not a diesel mechanic in any way I do know it's a remanded transmission it's a mack maxitourqe 18 speed everything should be tight as a tranny shop did all the work the range valve is new on top of tranny as is the shifter knob I think it's an air issue it shifts fine in morning until tranny temp reaches 150 degree or the air pressure drops below 110 Quote Link to comment https://www.bigmacktrucks.com/topic/54136-tranny-hi-low-issue/#findComment-405009 Share on other sites More sharing options...
jkruss82 Posted August 28, 2018 Share Posted August 28, 2018 Recommend checking air pressure on both sides of the shift cylinder and shift between Hi and Lo, and do this with a warm transmission if possible. Its possibly you just need some seals I've generally heard that the shifting gets better on a warm trans, but in your case the opposite could possibly be true. Quote Link to comment https://www.bigmacktrucks.com/topic/54136-tranny-hi-low-issue/#findComment-405048 Share on other sites More sharing options...
range forestry Posted January 12, 2020 Share Posted January 12, 2020 trying to find the strainer on transmission on a 18 speed mack low side is grindding was told to clean filter where is it loacated please Quote Link to comment https://www.bigmacktrucks.com/topic/54136-tranny-hi-low-issue/#findComment-440165 Share on other sites More sharing options...
fjh Posted January 13, 2020 Share Posted January 13, 2020 (edited) Highly doubt thats your issue how ever the screen is in the range valve on top there! Make sure the output yoke is tight! If it has a cummins in front of it the yoke is likly loose! this trans had problems before they redesigned it and the redesign made it worse ! Just SAYIN! 😡 Edited January 13, 2020 by fjh 1 Quote Link to comment https://www.bigmacktrucks.com/topic/54136-tranny-hi-low-issue/#findComment-440239 Share on other sites More sharing options...
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