dogg rescue Posted February 26 Share Posted February 26 We picked up a 99 ch with a rebuilt mack 13spd, it has a new Eaton clutch in it, new cable, arm and forks. The clutch works great, the trans brake is in adjustment as well as the clutch itself. The problem is it pushes harder than any other truck I have ever driven. Anyone have any ideas? Quote Link to comment https://www.bigmacktrucks.com/topic/73915-clutch-pushing-hard/ Share on other sites More sharing options...
Mark T Posted February 26 Share Posted February 26 I'd look at the cable. It should make a nice curved ark and not be shoved out of the way or anything like that. Maybe even disconnect it from the release lever on the clutch housing and see how it feels unhooked. It's not impossible it needs to be replaced . 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/73915-clutch-pushing-hard/#findComment-547269 Share on other sites More sharing options...
Joey Mack Posted February 26 Share Posted February 26 Mark T makes a good point.. No chance this has an air assist on the cable? 1 Quote Link to comment https://www.bigmacktrucks.com/topic/73915-clutch-pushing-hard/#findComment-547270 Share on other sites More sharing options...
fjh Posted February 27 Share Posted February 27 Mark nails this one ! In my opinion ! Replace the cable ! But there is a slim chance it has an air assist in which case you may have a bad slave! 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/73915-clutch-pushing-hard/#findComment-547274 Share on other sites More sharing options...
dogg rescue Posted February 27 Author Share Posted February 27 I failed to mention, the cable is brand new. Quote Link to comment https://www.bigmacktrucks.com/topic/73915-clutch-pushing-hard/#findComment-547290 Share on other sites More sharing options...
fjh Posted February 27 Share Posted February 27 16 minutes ago, dogg rescue said: I failed to mention, the cable is brand new. So if the cable is new did you replace it? Or was this done prior to you Owning it! If this truck was born with an air assist and it was removed before u owned it look for any random Capped off air line tucked up in the frame on that side! The levers on the trans and pedals have different geometry Shorter arm on the trans! Also the Clutch itself May be A non Easy Pedal Clutch ! Or is incorectly set! https://www.eaton.com/us/en-us/catalog/clutches-and-brakes/easy-pedal-advantage-clutch.html#:~:text=The Eaton Easy Pedal Advantage,Contact Eaton Above is the usual clutch used in the application with out an assist! Try stay away from a solo auto adjust if you got to replace! They tend to fill with clutch dust and cease to adjust them selves properly! 1 Quote Link to comment https://www.bigmacktrucks.com/topic/73915-clutch-pushing-hard/#findComment-547291 Share on other sites More sharing options...
Mark T Posted February 27 Share Posted February 27 I remember once, guy changed oil in the truck. Pushed the cable out of his way and never put it back in position. Huge difference in effort to push the clutch in. Of course that was once, but it happened Quote Link to comment https://www.bigmacktrucks.com/topic/73915-clutch-pushing-hard/#findComment-547303 Share on other sites More sharing options...
mechohaulic Posted February 27 Share Posted February 27 20 hours ago, fjh said: Mark nails this one ! In my opinion ! Replace the cable ! But there is a slim chance it has an air assist in which case you may have a bad slave! BUT also === a bad slave cyl WOULD NOT make the clutch hard to push; would be a slower reacting clutch operation. air assist would have a treadle style pedal NOT a manual operated clutch pedal. PLEASE NOTE these responses are based on very old school methods. thank you. Quote Link to comment https://www.bigmacktrucks.com/topic/73915-clutch-pushing-hard/#findComment-547307 Share on other sites More sharing options...
Joey Mack Posted February 27 Share Posted February 27 Sorry Mech,, his truck doesnt have those parts.. It has a heavy duty cable from the pedal arm to the release fork, and if it is air assisted, the cyl. is at the fork on the transmission.. similar to a steer assist, just 8'' long. Quote Link to comment https://www.bigmacktrucks.com/topic/73915-clutch-pushing-hard/#findComment-547314 Share on other sites More sharing options...
mrsmackpaul Posted February 28 Share Posted February 28 On R models in Australia there are two ways to mount the clutch cable One angle is for a Mack transmission and the other is for a RoadRanger I wonder if later models have the same deal going on Apparently this makes a huge difference on the effort required Paul 1 Quote Link to comment https://www.bigmacktrucks.com/topic/73915-clutch-pushing-hard/#findComment-547353 Share on other sites More sharing options...
R.E.D Posted April 15 Share Posted April 15 I remember my pops had a ch with the stiffest clutch ever.. ended up being wrong cable, I think it was too long. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/73915-clutch-pushing-hard/#findComment-549971 Share on other sites More sharing options...
mechohaulic Posted April 15 Share Posted April 15 either the cable had a sharp bend / kink ; as a result of way too long; the length shouldn't be a major factor since both ends of outer cables which have long enough thread to adjust clevis to clutch pedal / transmission arm are secured to mounting brackets. Quote Link to comment https://www.bigmacktrucks.com/topic/73915-clutch-pushing-hard/#findComment-549976 Share on other sites More sharing options...
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