NIDE9 Posted February 13, 2018 Share Posted February 13, 2018 I would like to service my 12 speed. I am looking for fluid capacity and I cant seem to find an air filter canister for it. Is there a downloadable link to a manual for this tranny? This tranny doesn't seem to like down shifting with the splitter very smoothly. Any tips? Quote Link to comment https://www.bigmacktrucks.com/topic/52497-12-speed-service/ Share on other sites More sharing options...
fjh Posted February 13, 2018 Share Posted February 13, 2018 (edited) There should be an air filter some where! if not its been removed! as for shifting how long you been driving this? These are a quite a bear to master! specialy spliting the 4 to 5 I know of only two or three guys that can split them up and down in the higher gears with out grinding and it takes lots of practice and experimenting with the engine brake! I have rode shot gun many times with guys diagnosing stuff !an only two or three could do it clean and they had a system with the engine brake swithch . I personally have never mastered it because I don't drive em for a living just wrench em! Having said that you can buy a oring kit and try rebuilding the shift lid That may help! as for the oil don't recall the litre 3 gal /12 litre rings a bell maybe . 85/ 90W Good luck with it! Edited February 13, 2018 by fjh Quote Link to comment https://www.bigmacktrucks.com/topic/52497-12-speed-service/#findComment-391901 Share on other sites More sharing options...
NIDE9 Posted February 13, 2018 Author Share Posted February 13, 2018 Wow thanks for the reply. I have only been driving it for a month or so. I’m sure with more miles in the seat I’ll get the hang of it or not. I love the tranny. I found the air filter but I can’t read the numbers on it to look one up. The truck sat for a bit and was only lightly used the last few years. I’m just freshening her up. By end of spring I hope to have new juice and filters front to back. Thanks again for your reply Quote Link to comment https://www.bigmacktrucks.com/topic/52497-12-speed-service/#findComment-391912 Share on other sites More sharing options...
j hancock Posted February 13, 2018 Share Posted February 13, 2018 I have picked up a manual from ebay for the 12 speed TRTXL 107 and 1070 Maxitorque transmission. May want to take a look there. 28 pints of either SAE 90 or 80W-90 gear oil. If I remember correctly the air filter is a Mack 2MD3131 which crosses to WIX 46102 for example. Quote JimIt doesn't cost anything to pay attention. Link to comment https://www.bigmacktrucks.com/topic/52497-12-speed-service/#findComment-391924 Share on other sites More sharing options...
turckster Posted February 14, 2018 Share Posted February 14, 2018 Manuals and other information can be purchased and downloaded on Mack's eMedia center. I found the manual for the TRTXL107/0 12 speed trans, showed to be about $22. Quote Link to comment https://www.bigmacktrucks.com/topic/52497-12-speed-service/#findComment-391980 Share on other sites More sharing options...
NIDE9 Posted February 20, 2018 Author Share Posted February 20, 2018 Thanks for all the replies. I ordered the manual off eBay. We had two feet of snow over the last weekend. I have been plowing snow and sadly have not had time to service the trans. Thanks again for all your input. One day I hope to be able to chime in and give a guy a hand or some useful advice on his truck. Quote Link to comment https://www.bigmacktrucks.com/topic/52497-12-speed-service/#findComment-392490 Share on other sites More sharing options...
NIDE9 Posted February 23, 2018 Author Share Posted February 23, 2018 Ok so I thought I bought a manual on eBay but I guess I didn’t confirm payment and some one else got it. We have pretty lousy internet out here in the country. I’ll find another some where. I’m not able to get the deep reduction to work. I place the truck in 1 and flip the switch on dash and all I hear is air at the dash switch. Where do I start? Quote Link to comment https://www.bigmacktrucks.com/topic/52497-12-speed-service/#findComment-392741 Share on other sites More sharing options...
fjh Posted February 24, 2018 Share Posted February 24, 2018 Try putting it in 1st then throwing the switch! 1 Quote Link to comment https://www.bigmacktrucks.com/topic/52497-12-speed-service/#findComment-392786 Share on other sites More sharing options...
NIDE9 Posted February 25, 2018 Author Share Posted February 25, 2018 I tried putting it in 1 first but to no avail. Could the air line be blocked? Quote Link to comment https://www.bigmacktrucks.com/topic/52497-12-speed-service/#findComment-392836 Share on other sites More sharing options...
mrsmackpaul Posted February 25, 2018 Share Posted February 25, 2018 There's a mechanical interlock in the lid that only allows deep reduction to be selected when in first I wonder if the interlock is stuck in the lid Paul Quote Link to comment https://www.bigmacktrucks.com/topic/52497-12-speed-service/#findComment-392838 Share on other sites More sharing options...
rjk440 Posted March 11, 2018 Share Posted March 11, 2018 there is a plug on right side of that transmission that serves as a filter remove and clean it's magnetic can't remember off hand but like 1 5/8 wrench to remove Quote Link to comment https://www.bigmacktrucks.com/topic/52497-12-speed-service/#findComment-393872 Share on other sites More sharing options...
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