touringsedan Posted November 22, 2022 Share Posted November 22, 2022 The clutch in my B61 is getting weak. It’s a CL28 clutch with the 711 and tri-plex transmission. we have made adjustments according to the manual but didn’t help much. I am trying to decide on replacing it myself or finding a local shop to do the work. is it even possible to buy a new disc, pressure plate and throw out bearing? Any thoughts or advice on the subject would be great appreciated. Mark 2 Quote Link to comment https://www.bigmacktrucks.com/topic/70741-%E2%80%9862-b61t-clutch/ Share on other sites More sharing options...
70mackMB Posted November 22, 2022 Share Posted November 22, 2022 I hope this helps to answer your question. .....Hippy Quote Link to comment https://www.bigmacktrucks.com/topic/70741-%E2%80%9862-b61t-clutch/#findComment-515784 Share on other sites More sharing options...
mechohaulic Posted November 22, 2022 Share Posted November 22, 2022 getting weak meaning it's slipping under load? the CL28 isn't a good reference to me ; many others on here can translate that number to a single or double disc. i would think it's a mack clutch not spicer or other brand. possibly lipe Quote Link to comment https://www.bigmacktrucks.com/topic/70741-%E2%80%9862-b61t-clutch/#findComment-515785 Share on other sites More sharing options...
mechohaulic Posted November 22, 2022 Share Posted November 22, 2022 another post a while back showed removal of the small 90 degree brackets by mounting bolts. can't remember reason. if that gave additional adjustment . Quote Link to comment https://www.bigmacktrucks.com/topic/70741-%E2%80%9862-b61t-clutch/#findComment-515786 Share on other sites More sharing options...
h67st Posted November 23, 2022 Share Posted November 23, 2022 I took my clutch to my local clutch shop, they had one in stock ('59 673 with TR720). I think it was right at $500 for disc, pressure plate, and throwout bearing. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/70741-%E2%80%9862-b61t-clutch/#findComment-515813 Share on other sites More sharing options...
touringsedan Posted November 23, 2022 Author Share Posted November 23, 2022 3 hours ago, mechohaulic said: getting weak meaning it's slipping under load? the CL28 isn't a good reference to me ; many others on here can translate that number to a single or double disc. i would think it's a mack clutch not spicer or other brand. possibly lipe It is not releasing. It is a single disc Quote Link to comment https://www.bigmacktrucks.com/topic/70741-%E2%80%9862-b61t-clutch/#findComment-515819 Share on other sites More sharing options...
touringsedan Posted November 23, 2022 Author Share Posted November 23, 2022 3 hours ago, mechohaulic said: another post a while back showed removal of the small 90 degree brackets by mounting bolts. can't remember reason. if that gave additional adjustment . I looked and didn’t see any shims. Quote Link to comment https://www.bigmacktrucks.com/topic/70741-%E2%80%9862-b61t-clutch/#findComment-515820 Share on other sites More sharing options...
terry Posted November 23, 2022 Share Posted November 23, 2022 9 hours ago, touringsedan said: It is not releasing. It is a single disc Could be stuck to the pressure plate or flywheel. Terry 1 Quote Link to comment https://www.bigmacktrucks.com/topic/70741-%E2%80%9862-b61t-clutch/#findComment-515833 Share on other sites More sharing options...
Brian L Blaylock Posted November 23, 2022 Share Posted November 23, 2022 Like Terry said it sounds like the clutch is stuck this is fairly common if the truck has sat for a considerable amount of time Quote Link to comment https://www.bigmacktrucks.com/topic/70741-%E2%80%9862-b61t-clutch/#findComment-515835 Share on other sites More sharing options...
High Binder Posted November 23, 2022 Share Posted November 23, 2022 I have three trucks with a stuck clutch due to sitting in a barn and my health issues. Now that my health has improved, I need to get them out and enjoy them. They have been started and run to build air numerous times. Does anyone have any ideas on how to break them loose without pulling the transmission? I could sure use some help. Quote Link to comment https://www.bigmacktrucks.com/topic/70741-%E2%80%9862-b61t-clutch/#findComment-515836 Share on other sites More sharing options...
Brocky Posted November 23, 2022 Share Posted November 23, 2022 1 hour ago, High Binder said: I have three trucks with a stuck clutch due to sitting in a barn and my health issues. Now that my health has improved, I need to get them out and enjoy them. They have been started and run to build air numerous times. Does anyone have any ideas on how to break them loose without pulling the transmission? I could sure use some help. You can try (??) going down the driveway at a fast idle, in a medium gear, and apply the brakes with the clutch pedal in release position. 1 Quote Brocky Link to comment https://www.bigmacktrucks.com/topic/70741-%E2%80%9862-b61t-clutch/#findComment-515838 Share on other sites More sharing options...
High Binder Posted November 23, 2022 Share Posted November 23, 2022 Brocky, A buddy of mine and I tried that earlier, but it didn't work. I'm not sure I had the brakes on the drive axle adjusted up enough. It would just scoot the Maxi's on the tag axle. Quote Link to comment https://www.bigmacktrucks.com/topic/70741-%E2%80%9862-b61t-clutch/#findComment-515839 Share on other sites More sharing options...
touringsedan Posted November 23, 2022 Author Share Posted November 23, 2022 When I say “ not releasing” it is not stuck. The manual says move gear shifter to 5th gear until light raking is felt. Then press clutch pedal slowly until it will shift into. 5th gear. Should be about 1/2 way to floor. on my I can go to floor with clutch and wait about 20 seconds before transmission stops and engages. Quote Link to comment https://www.bigmacktrucks.com/topic/70741-%E2%80%9862-b61t-clutch/#findComment-515856 Share on other sites More sharing options...
High Binder Posted November 23, 2022 Share Posted November 23, 2022 Sorry, I wasn't trying to hijack your thread. I thought you had a stuck clutch. I'm not familiar with your clutch or transmission but based on what knowledge I have, it sounds like the clutch is out of adjustment. Too much free play in the pedal? Just my thoughts. Quote Link to comment https://www.bigmacktrucks.com/topic/70741-%E2%80%9862-b61t-clutch/#findComment-515857 Share on other sites More sharing options...
terry Posted November 23, 2022 Share Posted November 23, 2022 52 minutes ago, High Binder said: Sorry, I wasn't trying to hijack your thread. I thought you had a stuck clutch. I'm not familiar with your clutch or transmission but based on what knowledge I have, it sounds like the clutch is out of adjustment. Too much free play in the pedal? Just my thoughts. Guess i took it wrong too. terry Quote Link to comment https://www.bigmacktrucks.com/topic/70741-%E2%80%9862-b61t-clutch/#findComment-515862 Share on other sites More sharing options...
mechohaulic Posted November 23, 2022 Share Posted November 23, 2022 if you have to wait 20 +- seconds before trans will go into gear without grinding; i would look at the possibility the clutch brake ( if a single disc has one) isn't working. looking up from bottom on trans bellhousing through the 3x4 opening, the pilot shaft might have a 3 piece tiny clutch assembly known as a clutch brake. later versions were a one piece unit. a 3 piece consist of two fiber disc and one center steel plate. the steel plate usually shears off the two tabs connecting it to pilot shaft. on the bottom of trans bell housing is there an adjustable (3/4or 7/8???threaded stud sticking out???? Quote Link to comment https://www.bigmacktrucks.com/topic/70741-%E2%80%9862-b61t-clutch/#findComment-515873 Share on other sites More sharing options...
mechohaulic Posted November 24, 2022 Share Posted November 24, 2022 older Macks the clutch was adjusted using exterior linkage/ clutch brake internal adjustment. the spicer clutch in most Macks just the opposite adjustment procedure; brake exterior adjust first then internal clutch adjust. you do not have a spicer clutch. If the clutch is working proper under load ,just doesn't allow for going into gear ; i would check the clutch brake adjustment in bell housing. loosen lock nut , turn out threaded bolt ONLY a little does alot. Quote Link to comment https://www.bigmacktrucks.com/topic/70741-%E2%80%9862-b61t-clutch/#findComment-515898 Share on other sites More sharing options...
touringsedan Posted November 24, 2022 Author Share Posted November 24, 2022 1 hour ago, mechohaulic said: older Macks the clutch was adjusted using exterior linkage/ clutch brake internal adjustment. the spicer clutch in most Macks just the opposite adjustment procedure; brake exterior adjust first then internal clutch adjust. you do not have a spicer clutch. If the clutch is working proper under load ,just doesn't allow for going into gear ; i would check the clutch brake adjustment in bell housing. loosen lock nut , turn out threaded bolt ONLY a little does alot. I am not sure my truck has a clutch brake. It’s a single disc. Quote Link to comment https://www.bigmacktrucks.com/topic/70741-%E2%80%9862-b61t-clutch/#findComment-515903 Share on other sites More sharing options...
terry Posted November 24, 2022 Share Posted November 24, 2022 I have never seen a clutch brake on a single disc clutch. Terry 2 Quote Link to comment https://www.bigmacktrucks.com/topic/70741-%E2%80%9862-b61t-clutch/#findComment-515907 Share on other sites More sharing options...
Mark T Posted November 24, 2022 Share Posted November 24, 2022 Some had some type that worked on the counter shaft on some models. NOT the one that is squeezed by the release bearing Quote Link to comment https://www.bigmacktrucks.com/topic/70741-%E2%80%9862-b61t-clutch/#findComment-515916 Share on other sites More sharing options...
terry Posted November 24, 2022 Share Posted November 24, 2022 4 hours ago, Mark T said: Some had some type that worked on the counter shaft on some models. NOT the one that is squeezed by the release bearing That was for the old push type double disc ones. terry 1 Quote Link to comment https://www.bigmacktrucks.com/topic/70741-%E2%80%9862-b61t-clutch/#findComment-515933 Share on other sites More sharing options...
Mark T Posted November 24, 2022 Share Posted November 24, 2022 2 hours ago, terry said: That was for the old push type double disc ones. terry 72 series .. I thought I saw it in the picture he posted . looks like the part the release yoke comes in contact with. Quote Link to comment https://www.bigmacktrucks.com/topic/70741-%E2%80%9862-b61t-clutch/#findComment-515939 Share on other sites More sharing options...
terry Posted November 24, 2022 Share Posted November 24, 2022 1 hour ago, Mark T said: 72 series .. I thought I saw it in the picture he posted . looks like the part the release yoke comes in contact with. That is the throw out bearing. Terry Quote Link to comment https://www.bigmacktrucks.com/topic/70741-%E2%80%9862-b61t-clutch/#findComment-515943 Share on other sites More sharing options...
Mark T Posted November 25, 2022 Share Posted November 25, 2022 48 minutes ago, terry said: That is the throw out bearing. Terry Quote Link to comment https://www.bigmacktrucks.com/topic/70741-%E2%80%9862-b61t-clutch/#findComment-515945 Share on other sites More sharing options...
touringsedan Posted November 25, 2022 Author Share Posted November 25, 2022 1 hour ago, Mark T said: I was not sure what that was for? So that’s a clutch brake? Quote Link to comment https://www.bigmacktrucks.com/topic/70741-%E2%80%9862-b61t-clutch/#findComment-515949 Share on other sites More sharing options...
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