tylerstanley Posted September 13, 2009 Share Posted September 13, 2009 have a 2006 cv713 with a s440 rear ends. Pardon me for my lack of technical terms, but there is diff. oil leaking around both of the tandems where the drive shaft comes into the top carrier. The front tandem had the power divider, then after that is where it is leaking. Its not a bad leak on the front tandem, but the bottom seems to get worse all the time. Well, anyways, my dealer says there are no seals or gaskets to put there???? Its just metal to metal? Is that correct, and if its not, how hard is it to replace the seals to get them to stop leaking. Quote Link to comment https://www.bigmacktrucks.com/topic/10633-leaking-tandems/ Share on other sites More sharing options...
HK Trucking Posted September 13, 2009 Share Posted September 13, 2009 have a 2006 cv713 with a s440 rear ends. Pardon me for my lack of technical terms, but there is diff. oil leaking around both of the tandems where the drive shaft comes into the top carrier. The front tandem had the power divider, then after that is where it is leaking. Its not a bad leak on the front tandem, but the bottom seems to get worse all the time. Well, anyways, my dealer says there are no seals or gaskets to put there???? Its just metal to metal? Is that correct, and if its not, how hard is it to replace the seals to get them to stop leaking.Sounds like you're saying it's leaking where the pinion housing attaches to the differential housing. If that's the case, there are steel shims in there that are used to adjust the pinion depth. Are the bolts that hold the pinion housing onto the diff housing tight? Check that first.. Quote "If You Can't Shift It Smoothly, You Shouldn't Be Driving It" Link to comment https://www.bigmacktrucks.com/topic/10633-leaking-tandems/#findComment-40296 Share on other sites More sharing options...
fjh Posted September 13, 2009 Share Posted September 13, 2009 have a 2006 cv713 with a s440 rear ends. Pardon me for my lack of technical terms, but there is diff. oil leaking around both of the tandems where the drive shaft comes into the top carrier. The front tandem had the power divider, then after that is where it is leaking. Its not a bad leak on the front tandem, but the bottom seems to get worse all the time. Well, anyways, my dealer says there are no seals or gaskets to put there???? Its just metal to metal? Is that correct, and if its not, how hard is it to replace the seals to get them to stop leaking.Can you provide a picture?The power divider was resealed?Mack top load diffs have inside bolts that some times come loose!Then leak at where the diff bolts to the housing,Is this where your leak apears ?Near the large side cover lh side? Quote Link to comment https://www.bigmacktrucks.com/topic/10633-leaking-tandems/#findComment-40300 Share on other sites More sharing options...
HK Trucking Posted September 13, 2009 Share Posted September 13, 2009 Can you provide a picture?The power divider was resealed?Mack top load diffs have inside bolts that some times come loose!Then leak at where the diff bolts to the housing,Is this where your leak apears ?Near the large side cover lh side?Don't forget the possibility of a crack in the banjo housing in that area also, if it's a fabricated steel housing, especially on the rearmost one with the transverse torque rod.I've welded up a couple of those that did that.But it sounds to me like he's referring to where the pinion housing bolts to the front of the diff.. Quote "If You Can't Shift It Smoothly, You Shouldn't Be Driving It" Link to comment https://www.bigmacktrucks.com/topic/10633-leaking-tandems/#findComment-40301 Share on other sites More sharing options...
fjh Posted September 13, 2009 Share Posted September 13, 2009 Don't forget the possibility of a crack in the banjo housing in that area also, if it's a fabricated steel housing, especially on the rearmost one with the transverse torque rod.I've welded up a couple of those that did that.But it sounds to me like he's referring to where the pinion housing bolts to the front of the diff..Yup your right on that possiblity hk but My observation on that is that normaly happend on the back diff housing or one that has a torque rod to the frame.Very possible if the truck has torque rods. Quote Link to comment https://www.bigmacktrucks.com/topic/10633-leaking-tandems/#findComment-40308 Share on other sites More sharing options...
tylerstanley Posted September 13, 2009 Author Share Posted September 13, 2009 the truck has a torque rod on the rear tandem....... but not on the front tandem. Its not leaking where the top part mounts to the bottom housing, but where the drive shaft comes into the tandem its self. there are bolts that are odd looking. Like you have to use a 16 point wrench to tighten them up. But they are tight, I have already checked...... Ill see if I can get a picture tomorrow. If i had these two leaks fixed, then i would have a "leak free" truck! I just fixed a shepherd steering gear that the seal was leaking opposite the sector shaft. Well, I take that back, the 4 stage dump hoist is leaking, but from what i heard, you could put new seals in it, and the next day it would leak???? Quote Link to comment https://www.bigmacktrucks.com/topic/10633-leaking-tandems/#findComment-40324 Share on other sites More sharing options...
HK Trucking Posted September 13, 2009 Share Posted September 13, 2009 the 4 stage dump hoist is leaking, but from what i heard, you could put new seals in it, and the next day it would leak???? If a new or rebuilt telescopic hoist cylinder starts leaking soon after installation, it's usually because the pins are worn at the rear hinge where the dump body attaches to the frame.Worn rear pins allow the dump body to swing from side to side when raised, and that will wreck the seals in short order, especially if the driver is in the habit of driving away before the body is all the way back down, which results in the dump body slamming from side to side and pounding sideways on the hoist cylinder as the wheels travel over uneven ground.If the rear hinge pins are shot, fix them first, then replace or rebuild the cylinder.After that, be sure the pins are greased daily and they should last a long time.Also, try to allow the body to come all the way down before driving away after dumping.. Quote "If You Can't Shift It Smoothly, You Shouldn't Be Driving It" Link to comment https://www.bigmacktrucks.com/topic/10633-leaking-tandems/#findComment-40325 Share on other sites More sharing options...
fjh Posted September 14, 2009 Share Posted September 14, 2009 the truck has a torque rod on the rear tandem....... but not on the front tandem. Its not leaking where the top part mounts to the bottom housing, but where the drive shaft comes into the tandem its self. there are bolts that are odd looking. Like you have to use a 16 point wrench to tighten them up. But they are tight, I have already checked...... Ill see if I can get a picture tomorrow. If i had these two leaks fixed, then i would have a "leak free" truck! I just fixed a shepherd steering gear that the seal was leaking opposite the sector shaft. Well, I take that back, the 4 stage dump hoist is leaking, but from what i heard, you could put new seals in it, and the next day it would leak????The bolts are 12 point if the leak is on the rh side( sitting in the drivers seat) there is oil return holes that side ya need to pull that whole thing out clean and dri all the shims between that peice and the housing and apply a thin coat of silcone to both sides of each shim all the way around and re install.and tighten the hell out of them bolts! Quote Link to comment https://www.bigmacktrucks.com/topic/10633-leaking-tandems/#findComment-40367 Share on other sites More sharing options...
tylerstanley Posted September 15, 2009 Author Share Posted September 15, 2009 here is a picture of my problem...... i think this is the rear tandem....... I think this will clear up where it is leaking. Quote Link to comment https://www.bigmacktrucks.com/topic/10633-leaking-tandems/#findComment-40392 Share on other sites More sharing options...
HK Trucking Posted September 15, 2009 Share Posted September 15, 2009 That's just damp, not really leaking.As long as you have made sure the bolts are tight, I'd recommend leaving it alone.If something starts leaking to the point where it's actually wet or oil is dripping, then it's time to take action.. Quote "If You Can't Shift It Smoothly, You Shouldn't Be Driving It" Link to comment https://www.bigmacktrucks.com/topic/10633-leaking-tandems/#findComment-40404 Share on other sites More sharing options...
theakerstwo Posted September 16, 2009 Share Posted September 16, 2009 Yes let it be. It ant leaking yet. Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/10633-leaking-tandems/#findComment-40436 Share on other sites More sharing options...
fjh Posted September 16, 2009 Share Posted September 16, 2009 Yes let it be. It ant leaking yet.Agreeded! Quote Link to comment https://www.bigmacktrucks.com/topic/10633-leaking-tandems/#findComment-40464 Share on other sites More sharing options...
tylerstanley Posted September 16, 2009 Author Share Posted September 16, 2009 Is this not a easy fix? ONe guy told me that every camelback he has saw leaks right there, and you can never get it to stop. Quote Link to comment https://www.bigmacktrucks.com/topic/10633-leaking-tandems/#findComment-40467 Share on other sites More sharing options...
terry Posted September 16, 2009 Share Posted September 16, 2009 I would not even call that a leak! not enough to mess with. Terry Quote Link to comment https://www.bigmacktrucks.com/topic/10633-leaking-tandems/#findComment-40481 Share on other sites More sharing options...
HK Trucking Posted September 16, 2009 Share Posted September 16, 2009 Is this not a easy fix? ONe guy told me that every camelback he has saw leaks right there, and you can never get it to stop.I admire your pursuit of perfection.That said, save your exuberance for something more worthy of repair. Owning your own truck will present many opportunities to justifiably pull wrenches, at all hours of the day or night.If you really want to "fix" that "leak", then do what fjh said to do, and make sure you don't overdo it with the silicone, or the drain holes could get plugged up and then you will have a problem.It seems that the "tide of public opinion" regarding this issue is unanimous: let it be.. Quote "If You Can't Shift It Smoothly, You Shouldn't Be Driving It" Link to comment https://www.bigmacktrucks.com/topic/10633-leaking-tandems/#findComment-40483 Share on other sites More sharing options...
tylerstanley Posted September 17, 2009 Author Share Posted September 17, 2009 (edited) this is not our only truck...... BUT its the one I drive, so I like to keep it in perfection. We installed the new Michelin Xone XZY3 on the rear tandems this summer, and have gained 600 hundred pounds in payload capacity. My truck was the tester for these tires, I love them. What are your thoughts on the super singles on tri-axles? ANd have you ever heard any comments on them? Also, while Im at it, the truck is a 06' with a ASET 427. Are there any engine updates or anything of that nature that would give my truck more power, with just tinkering with the computer..... thanks also thanks for the replys on this subject. HK Trucking and FJH. Edited September 17, 2009 by tylerstanley Quote Link to comment https://www.bigmacktrucks.com/topic/10633-leaking-tandems/#findComment-40485 Share on other sites More sharing options...
HK Trucking Posted September 17, 2009 Share Posted September 17, 2009 What are your thoughts on the super singles on tri-axles? Never tried them anywhere except on the steer axle.My only concerns would be that in the event of a blowout, you're finished right where it happens, no possibility of "limping" to a safe stopping place or tire shop like when one tire on a dual wheel blows out, and since the footprint of a super single is slightly less than the total footprint of a set of duals, you may have a little less flotation in soft ground.Keep me posted on how they work out for you.. Quote "If You Can't Shift It Smoothly, You Shouldn't Be Driving It" Link to comment https://www.bigmacktrucks.com/topic/10633-leaking-tandems/#findComment-40488 Share on other sites More sharing options...
David Posted September 17, 2009 Share Posted September 17, 2009 Look forward to hydroplaning when the tread is half gone. Quote Link to comment https://www.bigmacktrucks.com/topic/10633-leaking-tandems/#findComment-40494 Share on other sites More sharing options...
jerrymac Posted September 17, 2009 Share Posted September 17, 2009 Regarding the minor oil seepage at the pinion housing, have you checked the vent cap on the carrier to make sure it isn't plugged? When the oil gets hot it expands and the pressure has to go somewhere. That somewhere is usually out through a wheel seal, pinion seal, or maybe in your case the pinion housing shims. Just a thought. Quote Link to comment https://www.bigmacktrucks.com/topic/10633-leaking-tandems/#findComment-40495 Share on other sites More sharing options...
tylerstanley Posted September 17, 2009 Author Share Posted September 17, 2009 Never tried them anywhere except on the steer axle.My only concerns would be that in the event of a blowout, you're finished right where it happens, no possibility of "limping" to a safe stopping place or tire shop like when one tire on a dual wheel blows out, and since the footprint of a super single is slightly less than the total footprint of a set of duals, you may have a little less flotation in soft ground.Keep me posted on how they work out for you..I agree with you on a blowout. BUT I must disagree with you on the footprint, the supersingles have a greater footprint than two duals. They are also better in the mud and soft dirt than duals. What they do is ride on top of the ground, instead of cutting into the dirt like duals. I had my first experience in the dirt with them, and the exact same trucks as mine, but with duals, were getting hung up, where i just went right past them. They are far superior to duals in the soft stuff...... Quote Link to comment https://www.bigmacktrucks.com/topic/10633-leaking-tandems/#findComment-40498 Share on other sites More sharing options...
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