DaveB6875 Posted February 2, 2023 Share Posted February 2, 2023 Hello, we have a TRT7220 trans in our B-75, We have a leak gear oil at the clutch brake. My question is can you replace the seal there without pulling the trans? Thank You Quote Link to comment https://www.bigmacktrucks.com/topic/72464-tri-plex-transmission/ Share on other sites More sharing options...
fjh Posted February 2, 2023 Share Posted February 2, 2023 1 minute ago, DaveB6875 said: Hello, we have a TRT7220 trans in our B-75, We have a leak gear oil at the clutch brake. My question is can you replace the seal there without pulling the trans? Thank You Hi is the clutch brake mounted on the counter shaft? do you have the seal? Quote Link to comment https://www.bigmacktrucks.com/topic/72464-tri-plex-transmission/#findComment-524443 Share on other sites More sharing options...
DaveB6875 Posted February 3, 2023 Author Share Posted February 3, 2023 Hello, yes, mounted on the countershaft, looks like you could do it, checking to see if anybody has done this before. Do not have a seal yet I have checked with Mack Museum about some info on the trans. Retired in July last year from 47 years a mechanic. Started out working on big trucks then at a township working on a variety of equipment, mowers, cars, trucks, tractors. When I started most of the Macks were 5 speeds or road rangers. Quote Link to comment https://www.bigmacktrucks.com/topic/72464-tri-plex-transmission/#findComment-524491 Share on other sites More sharing options...
fjh Posted February 3, 2023 Share Posted February 3, 2023 23 hours ago, fjh said: Hi is the clutch brake mounted on the counter shaft? do you have the seal? To be honest I only ever worked on one of these ! So I cant tell you Much How ever I see know reason you couldnt reseal it in frame getting the seal in and out may be tricky thou! You'll likely have to fab up some special toolage! 1 hour ago, DaveB6875 said: Hello, yes, mounted on the countershaft, looks like you could do it, checking to see if anybody has done this before. Do not have a seal yet I have checked with Mack Museum about some info on the trans. Retired in July last year from 47 years a mechanic. Started out working on big trucks then at a township working on a variety of equipment, mowers, cars, trucks, tractors. When I started most of the Macks were 5 speeds or road rangers. Quote Link to comment https://www.bigmacktrucks.com/topic/72464-tri-plex-transmission/#findComment-524497 Share on other sites More sharing options...
mechohaulic Posted February 3, 2023 Share Posted February 3, 2023 the memory banks may be playing havoc with me right now but ;;1- I thought the front transmission cover on the older units had a 1/4 dia pin which went through the front input shaft and spun in cover which had a reverse spiral to keep oil from leaking. newer units I'm sure have a seal now. 2- to replace a seal,, trans would have to be removed in order for seal to go over input shaft. 3- a clutch brake disc CAN be replaced without trans removal. a pain in ass job but can be done using updated two piece disc. Quote Link to comment https://www.bigmacktrucks.com/topic/72464-tri-plex-transmission/#findComment-524499 Share on other sites More sharing options...
Popular Post mechohaulic Posted February 3, 2023 Popular Post Share Posted February 3, 2023 update:: reread text. the clutch brake is on lower counter shaft ;NOT input . three spring loaded pins with 7/8th ? adjusting bolt . guess i should put this in shop talk column "" text kicked in before brain went into gear"""😁 1 2 Quote Link to comment https://www.bigmacktrucks.com/topic/72464-tri-plex-transmission/#findComment-524500 Share on other sites More sharing options...
DaveB6875 Posted February 4, 2023 Author Share Posted February 4, 2023 Thanks Guys for taking the time to respond. When I get things together and do the job I will post about it. Quote Link to comment https://www.bigmacktrucks.com/topic/72464-tri-plex-transmission/#findComment-524533 Share on other sites More sharing options...
fjh Posted February 4, 2023 Share Posted February 4, 2023 Do so thats Great we will all learn something 1 Quote Link to comment https://www.bigmacktrucks.com/topic/72464-tri-plex-transmission/#findComment-524559 Share on other sites More sharing options...
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