trucking251 Posted February 23 Share Posted February 23 2 of my slack adjusters are backing them self off and not making clicking noise when adjusting. Should I try to take apart and clean or just order new? and are ones on ebay worth anything or stay with OEM? Quote Link to comment https://www.bigmacktrucks.com/topic/73902-slack-adjusters/ Share on other sites More sharing options...
Joey Mack Posted February 23 Share Posted February 23 What style are they ? Where on the truck are they, just curious. Quote Link to comment https://www.bigmacktrucks.com/topic/73902-slack-adjusters/#findComment-547030 Share on other sites More sharing options...
fjh Posted February 23 Share Posted February 23 Just replace! Ain’t worth messing with! 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/73902-slack-adjusters/#findComment-547033 Share on other sites More sharing options...
Popular Post mrsmackpaul Posted February 24 Popular Post Share Posted February 24 I use a old air tank off a trailer Mount it vertically and half fill it with diesel Then a small 1/8th connected to a grease nipple fitting, Zerk fitting you lot will call it Anyway, compressed air in the tank and forcing diesel under pressure in to the slack adjuster Slack adjuster needs to be off the truck and clamped in a vice for this Then on with the rattle gun and all the dry old grease spews out the sides This pretty much always works and then just pump full of fresh grease Make sure the locking doohickie (collar) on the adjusting bolt is free to click in and out This should solve your problems If the slack adjuster is backing off it isnt locking in the collar Paul 3 Quote Link to comment https://www.bigmacktrucks.com/topic/73902-slack-adjusters/#findComment-547086 Share on other sites More sharing options...
Joey Mack Posted February 25 Share Posted February 25 Paul... you speak a great truth.. however, here in this land we throw stuff in the trash.. and I'm sure his slack adjust is automatic. you speak of a manual slack adjuster, which works perfectly. just needs to be checked regularly.. thanks again for posting a real repair... jojo Quote Link to comment https://www.bigmacktrucks.com/topic/73902-slack-adjusters/#findComment-547088 Share on other sites More sharing options...
mowerman Posted February 25 Share Posted February 25 Self adjusters can’t help…. I am used to a spring loaded sleeve around the 9/16 bolt in that case WD-40. And patience. Good luck whatever you decide…. Bob Quote Link to comment https://www.bigmacktrucks.com/topic/73902-slack-adjusters/#findComment-547095 Share on other sites More sharing options...
mechohaulic Posted February 25 Share Posted February 25 two are backing off ? does this imply these are on drive axle and there are two other wheels which work correctly ?? one of two axles? both slacks on same axle ? what brand of slacks are used? are slacks mounted working backwards?? size wrench used to adjust ??? 9/16 = 7/16 ?? auto or manual adjusters ?? 1 Quote Link to comment https://www.bigmacktrucks.com/topic/73902-slack-adjusters/#findComment-547098 Share on other sites More sharing options...
Popular Post Mark T Posted February 25 Popular Post Share Posted February 25 This fella didn't list anywhere near enough info about what kind of slacks he's talking about, or better yet pictures. !!! stay outta his way !!! (lol) 2 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/73902-slack-adjusters/#findComment-547115 Share on other sites More sharing options...
mowerman Posted February 25 Share Posted February 25 I haven’t really paid much attention to them but I know they are different now I haven’t had to adjust one and over 30 years But you know how that goes on here people ask for information you give it to them they just disappear ha ha 1 Quote Link to comment https://www.bigmacktrucks.com/topic/73902-slack-adjusters/#findComment-547122 Share on other sites More sharing options...
mowerman Posted February 25 Share Posted February 25 1 hour ago, Mark T said: This fella didn't list anywhere near enough info about what kind of slacks he's talking about, or better yet pictures. !!! stay outta his way !!! (lol) Oh, what are they say? Pictures are worth 1000 words.Lol Quote Link to comment https://www.bigmacktrucks.com/topic/73902-slack-adjusters/#findComment-547123 Share on other sites More sharing options...
Vladislav Posted February 25 Share Posted February 25 4 hours ago, mowerman said: Oh, what are they say? Pictures are worth 1000 words.Lol At the moment we talk about at least 2 slack ajuster worth 1 Quote Никогда не бывает слишком много грузовиков! leversole 11.2012 Link to comment https://www.bigmacktrucks.com/topic/73902-slack-adjusters/#findComment-547156 Share on other sites More sharing options...
Joey Mack Posted February 25 Share Posted February 25 theres not enough info.. are they old? are they new? are they on the front drive incorrectly? anyway.. I guess we wait for him to post more info and pictures.. jojo Quote Link to comment https://www.bigmacktrucks.com/topic/73902-slack-adjusters/#findComment-547157 Share on other sites More sharing options...
Mark T Posted February 25 Share Posted February 25 I kinda think (wild guess) he's talking about Haldex slacks on a Mack. Sounds kinda like what they do when the cams and bushings were worn and the serated ring for the adjustment is rounded off. Again, just a guess. Quote Link to comment https://www.bigmacktrucks.com/topic/73902-slack-adjusters/#findComment-547164 Share on other sites More sharing options...
Joey Mack Posted February 25 Share Posted February 25 👍 Quote Link to comment https://www.bigmacktrucks.com/topic/73902-slack-adjusters/#findComment-547165 Share on other sites More sharing options...
trucking251 Posted February 27 Author Share Posted February 27 On 2/24/2024 at 8:23 PM, mechohaulic said: two are backing off ? does this imply these are on drive axle and there are two other wheels which work correctly ?? one of two axles? both slacks on same axle ? what brand of slacks are used? are slacks mounted working backwards?? size wrench used to adjust ??? 9/16 = 7/16 ?? auto or manual adjusters ?? 7/16 to adjust. Haldex. both on drivers side drive axles, they worked fine for 2 years and then didn't. Back in fall on time when I greased lot's of water came out. Quote Link to comment https://www.bigmacktrucks.com/topic/73902-slack-adjusters/#findComment-547297 Share on other sites More sharing options...
trucking251 Posted February 27 Author Share Posted February 27 the adjuster ring thingy my finger is on has tons of slop in it, so not sure just cleaning would make these work again. I will adjust so 1 1/4" travel when applied, within 2 days have 3" of travel. Quote Link to comment https://www.bigmacktrucks.com/topic/73902-slack-adjusters/#findComment-547298 Share on other sites More sharing options...
Joey Mack Posted February 27 Share Posted February 27 When you back them off, is the ratchet in them really strong or do they crank backwards really easy with little to no clicking? Quote Link to comment https://www.bigmacktrucks.com/topic/73902-slack-adjusters/#findComment-547300 Share on other sites More sharing options...
trucking251 Posted February 27 Author Share Posted February 27 no clicking Quote Link to comment https://www.bigmacktrucks.com/topic/73902-slack-adjusters/#findComment-547301 Share on other sites More sharing options...
Mark T Posted February 27 Share Posted February 27 Those slacks are junk. Likely you need cams and bushings too. A new slack will work for a while. It's gonna do the same thing if the cams are shot though. 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/73902-slack-adjusters/#findComment-547302 Share on other sites More sharing options...
Popular Post mechohaulic Posted February 27 Popular Post Share Posted February 27 never had a good word to say of those slacks == so I won't say. go back to manual slacks == but of course I would go back to dial telephones . 2 1 Quote Link to comment https://www.bigmacktrucks.com/topic/73902-slack-adjusters/#findComment-547304 Share on other sites More sharing options...
mrsmackpaul Posted February 27 Share Posted February 27 3 inches of movement, didn't know cans would push a rod that far Anyway, maybe some modern disc brake job I have never seem Certianly a type of slack adjuster I have never seen Maybe check the adjuster is actually backing off and not the S cam just winding around and around from worn drums and shoes This only applies with drum brakes though I have had trailers I have bought were a combination of wrong sized rollers, worn shoes, worn S cam bushes and stuffed drums allow the S cam to just keep on spinning It is amazing how good things actually work when things aren't worn The old swiss cheese effect, like on those aircraft investigation shows, it's never the wing falling off the plane, it's always a combination of a lot of small stuff lining up at the wrong time Paul 1 Quote Link to comment https://www.bigmacktrucks.com/topic/73902-slack-adjusters/#findComment-547311 Share on other sites More sharing options...
Popular Post Joey Mack Posted February 27 Popular Post Share Posted February 27 we have long stroke brake chambers here, 3'' stroke. they can be identified by the square shaped air line ports on the chamber.. We cant go back to Real Slacks, because of the Gov'ment.. Manual slacks can only be used if the truck was born with them. Too bad, they work good, and with regular maint, continue to work good.. I prefer them too..... 3 1 Quote Link to comment https://www.bigmacktrucks.com/topic/73902-slack-adjusters/#findComment-547315 Share on other sites More sharing options...
Popular Post fjh Posted February 27 Popular Post Share Posted February 27 6 minutes ago, Joey Mack said: we have long stroke brake chambers here, 3'' stroke. they can be identified by the square shaped air line ports on the chamber.. We cant go back to Real Slacks, because of the Gov'ment.. Manual slacks can only be used if the truck was born with them. Too bad, they work good, and with regular maint, continue to work good.. I prefer them too..... Agreed long stroke should be mandatory in my mind! More room for error if the driver doesn’t know how to look at brakes! No need to have brake checks if people don’t know what they’re looking at! 2 1 Quote Link to comment https://www.bigmacktrucks.com/topic/73902-slack-adjusters/#findComment-547316 Share on other sites More sharing options...
Popular Post mrsmackpaul Posted February 28 Popular Post Share Posted February 28 Wouldn't it be better for people to learn how to adjust brakes ?? Paul 1 3 Quote Link to comment https://www.bigmacktrucks.com/topic/73902-slack-adjusters/#findComment-547320 Share on other sites More sharing options...
Joey Mack Posted February 28 Share Posted February 28 It would be... as well as knowing how to get things done !! much like how you (Paul) have to grab the bull by the horns to get the job done.. With great respect... Jojo 1 Quote Link to comment https://www.bigmacktrucks.com/topic/73902-slack-adjusters/#findComment-547321 Share on other sites More sharing options...
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