Swishy Posted February 29, 2016 Share Posted February 29, 2016 OKTrouble in the camp1998 Mack Ch 18 speed Mack cog box@ times wont change from hi to low in the range change (up/down on the stick)wot we need to fix?is there a kit available?is it a case of Piston cylinder and a few 'O'rings?how hard is it to fit all the 'O' rings?How long will I take?dose it need sum lube in the cylinder?have already tied using castor OilThanx in AdvanceGive till it hurtzLOLcya§wishy Quote Link to comment https://www.bigmacktrucks.com/topic/44169-mack-18-speed/ Share on other sites More sharing options...
mrsmackpaul Posted February 29, 2016 Share Posted February 29, 2016 do you have air getting to the air rams ???Paul Quote Link to comment https://www.bigmacktrucks.com/topic/44169-mack-18-speed/#findComment-326052 Share on other sites More sharing options...
fullfuel01 Posted February 29, 2016 Share Posted February 29, 2016 I had one like that. The air valve was getting tored on it. I did try to overhaul it with new oring but it was a waste of time. Quote Link to comment https://www.bigmacktrucks.com/topic/44169-mack-18-speed/#findComment-326077 Share on other sites More sharing options...
mrgumby Posted February 29, 2016 Share Posted February 29, 2016 (edited) i may be wrong but we had a 98 ch with the mack 18 speed in it and had the same problem...seems they had problem with bearings in them...mack called it a silent recall they only fixed them as needed we had two of them that had problems with the mack 18 speed that year...after we had it repaired they worked great .. but there were times when it shifted fine ..and then it wouldnt shift at all..or would grind real bad between low and high....also have you checked the valve on the stick seen those go bad too Edited March 1, 2016 by mrgumby Quote Link to comment https://www.bigmacktrucks.com/topic/44169-mack-18-speed/#findComment-326097 Share on other sites More sharing options...
b68 Posted March 7, 2016 Share Posted March 7, 2016 I got some 2180 18 speeds. one I have to take the lines off the cylinder on the back of the trans and get just a sqwirt or 2 of oil in each side and its good for months. Quote Link to comment https://www.bigmacktrucks.com/topic/44169-mack-18-speed/#findComment-326743 Share on other sites More sharing options...
kt_Engineer Posted December 20, 2016 Share Posted December 20, 2016 You have a synchronizer issue. The older versions have low range side of synchronizer with insufficient tooth engagement and improper shifting will cause the tooth to round off and eventually you will not be able to reengage lo side. The whole synchronizer will need to be replaced. The new kits that have been released in 2010 use higher grade steel (4320H) and also increased dove/taper that will decrease the possibility. of this happening 1 Quote Link to comment https://www.bigmacktrucks.com/topic/44169-mack-18-speed/#findComment-355623 Share on other sites More sharing options...
Elitedownunder Posted February 3, 2017 Share Posted February 3, 2017 mine is doing the same thing 94 CLR 454 VMAC it is a 18 speed T2180 and the shifter ( when moving from low to high you can hear engage) but the box remains in neutral... I hate to think it is what KT engineer is saying, any other diagnostics to rule out everything else? Without a book for this I don't know what the air solenoid is moving ? Quote Link to comment https://www.bigmacktrucks.com/topic/44169-mack-18-speed/#findComment-360582 Share on other sites More sharing options...
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