SLEDOG Posted June 11, 2023 Share Posted June 11, 2023 I installed a set of new recaps across the front tandem on my Granite triaxle dump truck. in 8000 miles I’ve lost about 80% of tread. Is it possible the power divider is not functioning properly to cause this problem and how do I check that? Quote Link to comment Share on other sites More sharing options...
Joey Mack Posted June 11, 2023 Share Posted June 11, 2023 Camel back or Hendrickson HN or Walking beam rear suspension?? Quote Link to comment Share on other sites More sharing options...
Joey Mack Posted June 11, 2023 Share Posted June 11, 2023 Here is a tool I made about 10 years or so, ago.. I needed to diagnose tire wear on a truck that was in a minor wreck. I made this tool to measure the distance between the drive axles to see how far off they were.. Its ugly, but it works and I will still use it today if needed.. I basically made 2 sliding pointers with clamp bolts, and slipped them over some wire conduit.. i sharpened the tips of the pointers so they would fit good into the dimples on the axle flanges.. 1 Quote Link to comment Share on other sites More sharing options...
SLEDOG Posted June 11, 2023 Author Share Posted June 11, 2023 Camel back Quote Link to comment Share on other sites More sharing options...
Joey Mack Posted June 11, 2023 Share Posted June 11, 2023 have you looked at the torque arm bushings, and the box rubbers, as well as any wear on the spring tips in the boxes? they should not touch the boxes anywhere.. if the upper pads are worn out badly, you will be able to wiggle them without jacking the truck up.. and of course there is always the trunnion bushings too.. but lets keep it basic.. Quote Link to comment Share on other sites More sharing options...
SLEDOG Posted June 11, 2023 Author Share Posted June 11, 2023 Torque arm bushings look ok…box rubbers look like they may be coming apart….new trunnion bearings a couple years ago so I HOPE they are ok… It does dog track a little…. Quote Link to comment Share on other sites More sharing options...
Joey Mack Posted June 11, 2023 Share Posted June 11, 2023 box rubbers!! Atro makes a decent affordable kit, with the bolts.. You may want to get 12 more washers.. if you like washers on both sides of the bolt.. and put twinkies in the boxes too... jojo Quote Link to comment Share on other sites More sharing options...
tjc transport Posted June 11, 2023 Share Posted June 11, 2023 when my granite started doing that, we noticed slight wear on the spring tips. and i was getting a strange clunk on acceleration. after taking it apart we found the centering pins in the box rubbers were sheared off, letting the front axle wander about 3/4 inch 2 Quote when you are up to your armpits in alligators, it is hard to remember you only came in to drain the swamp.. Link to comment Share on other sites More sharing options...
SLEDOG Posted June 11, 2023 Author Share Posted June 11, 2023 Ok Joey I’ll look into that…. The air acuater for the pier divider lockout…is that supposed to slide off when bolts are removed? I can only move that back an 1/8 inch when trying to pull that off too check it out Quote Link to comment Share on other sites More sharing options...
SLEDOG Posted June 11, 2023 Author Share Posted June 11, 2023 Thanks tjc I’ll check that also Quote Link to comment Share on other sites More sharing options...
Joey Mack Posted June 11, 2023 Share Posted June 11, 2023 The metal plate they are part of comes right out of the rubber bolster.. I have seen that dozens of times.. Quote Link to comment Share on other sites More sharing options...
Joey Mack Posted June 11, 2023 Share Posted June 11, 2023 you should be able to leave the power divider drum in place, and pull the shifter section out by itself.. what makes you think it needs inspecting?? Quote Link to comment Share on other sites More sharing options...
Joey Mack Posted June 11, 2023 Share Posted June 11, 2023 can you rotate the yoke back and forth to dissengage the 'peanuts' in the power divider? Quote Link to comment Share on other sites More sharing options...
SLEDOG Posted June 11, 2023 Author Share Posted June 11, 2023 I don’t see the locker is shifting in and out properly when air is applied …. Quote Link to comment Share on other sites More sharing options...
Joey Mack Posted June 11, 2023 Share Posted June 11, 2023 when you get it apart you can bench test it. look closely at the sliding clutch and clutching teeth on the outer cam drum also.. you dont need to use high air pressure to actuate the shift fork and clutch, it can fly out.. Quote Link to comment Share on other sites More sharing options...
SLEDOG Posted June 11, 2023 Author Share Posted June 11, 2023 I didn’t try rotating yoke on driveshaft…. Quote Link to comment Share on other sites More sharing options...
mechohaulic Posted June 11, 2023 Share Posted June 11, 2023 not to "throw a wrench" in the topic , it does sound as though there is a mechanical problem; by chance did the recaps come from a different supplier ? a worn mechanical :bushings, pins etc should cause driving havoc to a degree. 4 tires (caps) worn evenly too soon possible caps poor quality ? the divider engaged at high road speed for extended time would let you know it. usually with gear oil and parts on the ground. 1 1 Quote Link to comment Share on other sites More sharing options...
SLEDOG Posted June 11, 2023 Author Share Posted June 11, 2023 Same supplier on recaps but I am going to check with them tomorrow to see if they changed compounds or something…. 1 Quote Link to comment Share on other sites More sharing options...
Popular Post mrsmackpaul Posted June 12, 2023 Popular Post Share Posted June 12, 2023 Tyres on Mack axles need to be matched as the power divider isnt a diff If only one axle was changed it would mean that this axle is trying to drive the truck faster than the other axle So it is important to measure and be aware of this Match the tyres in duals and run the two biggest sets diagonally opposite each other This then allows the diff centers to take up the slight difference in diameter It is a no no to put new tyres on only the one axle on a Mack bogie drive Paul 2 2 Quote Link to comment Share on other sites More sharing options...
SLEDOG Posted June 21, 2023 Author Share Posted June 21, 2023 Not too sure Mrs Mack… finally got a chance to talk to my tire guy and he said they do that all the time on a Mack with no problems…. I still think I have a problem with power divider somehow and I know it’s not permanently locked in…. Sledog Quote Link to comment Share on other sites More sharing options...
Joey Mack Posted June 21, 2023 Share Posted June 21, 2023 Ok... Crazy thought.... Was either one of the carriers replaced recently? Quote Link to comment Share on other sites More sharing options...
mrsmackpaul Posted June 21, 2023 Share Posted June 21, 2023 Jack up any of the back wheels, any of the corners, block the truck so it cant roll, release the brakes and the wheel you have in the air should be able to be rolled Remembering it is not a power divider on a Mack axle, so it might be a little different than you expect Or if your tyre guy has the knowledge on this then let him sort it Paul Quote Link to comment Share on other sites More sharing options...
SLEDOG Posted June 23, 2023 Author Share Posted June 23, 2023 No work done on carriers and wheels spin freely….. Sledog Quote Link to comment Share on other sites More sharing options...
Joey Mack Posted June 23, 2023 Share Posted June 23, 2023 Ok.. Quote Link to comment Share on other sites More sharing options...
Popular Post JoeH Posted June 24, 2023 Popular Post Share Posted June 24, 2023 Dial this back to the problem. Recaps have burned through 80% of their tread in 8,000 miles. Cheap rubber compound? What kind of driving do you do? That's probably about the mileage that we get out of our tires, but we have a 15 mile radius and lots of backing into driveways. Scrubs the tread off pretty quick. How's your air pressure in the tires? I always find tires come back from tire shops way under pressure. This will lead to weird scalloping along the shoulders of the tread, and certainly more "scrubbing" of tire tread as the tandem twists through turns. Driving habits also affect tire life. Hard starts and hard braking will mean more wear on tires. Ideal driving habits should include anticipating red lights and coasting in easy in the hopes of hitting a green light that you can ease back into travel speed safely. Far too often in today's 500hp automatic trans world I'm seeing dump truck drivers slamming in to stops hard, taking off hard, and whipping in and out of traffic as if they were Porsches. HP is like a concealed carry gun. Just because you have it doesn't mean you have to use it... 2 1 Quote Link to comment Share on other sites More sharing options...
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