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Mack Technician
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Posts posted by Mack Technician
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None.
Range has a synchro, that’s it.
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If they left the thrust washers in production instead of a thrust ball bearing none of it would have happened. They undercut the snap ring land to half depth so the bearing could be used. We reverse engineered some back to original shaft style till we ran out of parts.
Did an in chassis sychro this summer on a buddies log truck. All updates installed in a T3. The double thick snap ring no longer pops off like the wimpy original......it shatters and runs through the gears. He called and said he had no high, so limped home in lo. I was picking bits out of everywhere, some rolled flat from gears, but no real damage. Reused everything but installed a new ring. Synchronizer looked fine, well preserved. But, yeah, better, no perfect fix.
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Automotive transmissions have synchronizers to bring individual gears up to speed before engaging them. That’s why you don’t have to think when shifting a car or pickup. Your transmission has one synchronizer for the range shift. Hence you have to RPM match gears manually or you get a lot of clash. No sychro(s) between gears.
If you try to shift a manual car without pushing in the clutch you would experience a Mack 18 speed in your car. Synchronizers can’t work without clutch depressed. I’ve tried it, it’s a bit tricky and not good for a synchronized trans, but experimentation and curiosity wins over common sense sometimes.
One thing to remember is to never range shift to low when going at high speed. A Mack tranny repairman from UPS (wouldn’t guess they use Mack tranny?) told me 3 times shifted to low, at 55 or above, and synchro is junk.
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4 hours ago, 41chevy said:
I do hope there isn't going to be a lot of yelling this time. It takes all the enjoyment out if a good shock wave and heat blast.
Waa Waa Waa! It's too windy, it's too hot, the lights to bright...
No dude, just think of the last time you were cooking up your world famous long pork. Sizzle and serve.....
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1 hour ago, m16ty said:
In my opinion, either keep what you have or go with a glider. I don’t care for all the crap they put on these new diesels.
like one of the earlier people said, who wants to sit through a 45 min parked regen? That’s not counting all the other mess they put on the engine that is going to cause you problems sooner or later.
Friday I ran into a friend who runs wood to our facility. He told me there are three loads of wood in a day. The last load is the only one you make money on. There is rarely four loads due to scale hours and distance to wood landings. One parked regen and he has a zero profit day. The thing that irks him is there is nothing he can do about it and no one to complain to.
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Lol, those suckers are cheap! I call it precision generic so the bean counters don’t feel buyers remorse. The indignation of going back to a hand primer pump on the Volvo fuel filters instead of a Deere or Cat with electric primer everything..... If Volvo wasn’t so cheap, and used an electric lift, all those failing-injector-trucks might actually prime and start instead of trying to inject leaked combustion gas. Take it a step forward and trick it with a “wait to start” light so the rail can Re-prime.
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IMO- If the machine has exclusive rights to logically regulate torque to the transmission, and take the ability of the driver to create a shock load condition, the new concepts can be paperweight light (Single countershaft). We are seeing it in our machines. They come with optishift. You can’t shock the trans unless you hit a concrete wall wide open. You can be going forward at top speed in the Volvo and throw it into a reverse drop. Machine decels engine, applies brakes logically and shifts the trans at a low speed threshold, repowers the engine to whatever percentage your foot demands and your heading the other direction. It happens fast and hard, faster than an operator could negotiate a direction change and all within a “safe” parameter.
Not flawless.....Do it enough at high speed and you eventually have a brake overheat. On an ice sheet your about to have a free carousel ride and make a lot of body work for the mechs.
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Mackr, I don’t want to make predictions, cause you keep disproving & confusing me, like why was splitting the issue, but synchro the failure? I’m hoping someone did not try to take advantage of your dissatisfaction? The Synchro (singular) generally fail from a bad, misdesigned, mainshaft snap ring and it’s undercut land. Plates and clutches were not the issue, they were well constructed. I will recant if one of the other mechanics call me on it....there was never a modification to “harder synchro metal”. If that guy told you Mack built an updated mainshaft with a double thick snap ring to retain the range synchro thrust bearing I’d say the guy was squared up, but sounds like a line from a guy who thinks there are multiple synchros in a non-gear synchro shift trans. Then again....if your driving the crazy thing without grinding.......something had to have been happening???
If your reman transmission(after running a month) is undriveable your going to need to position yourself for a warranty claim. Part of the claim should include a credible witness to the issue....as in a repair order from a dealer that condemns the transmission as having an internal issue or driveability issue that may include a suggested repair for the transmission.
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11 hours ago, Moparmike said:
Can someone tell me where all the truck grounds are on a 2000 rd I'd like to check those as well
Do a google search for “Mack Service Bulletin SB-221-032”. It will outline a complete ground cleaning and check.
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Welcome aboard SingleStack. Pull up a chair and join the discussion......
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The dump truck is running about 30 hours a week hauling snow, garbage or biomass. The roll off is dedicated to 24/7 intermittent use so hard to average.
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A slight twist in mainshaft would do that, but not in all gears. When rebuilt the tech needs to sand and polish the galling out of the shift rails. If they didn’t polished the gall, and then assembled dry, it could get sticky in all shifts initially.
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I owned two Jeeps and didn't understand the "Brotherhood of Jeep" until it was explained to me by a college "Bro". I was suppose to wave to every Jeep owner, but when I had the top off my Wrangler you make a fist above the roll bar. Sure enough, everybody did it....It's a sub-culture.
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On 11/28/2018 at 8:03 AM, RobM626 said:
That would be nice!
For what it's worth I can give you a couple break downs on our Kenworth cost centers
Both T440
One Roll-off, one tandem dump
Both Cummins ISL @ 345 horse
Both Allison 3000RDS
2011 Tandem Dump $7.78 per hour total maintenance
2010 Roll-off $11.74 per hour total maintenance
includes all outside/inside repairs and all parts including tires, internal and external labor, etc. Roll off has a hard life, clearly....one job is to deliver caustic ash. Don't have enough fleet diversity to make a case...
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13 hours ago, Bullheaded said:
I talked to an engineer from Detroit at a big trucking industry trade show a couple years back. We talked about my issues with regens. His words of advice:
"Even though these new motors have lots of low end torque and we advertise running low RPM to save fuel........in you application forget about fuel economy and drive it like you stole it like an old two stroke."
Rob’s ‘05 was built in the same spirit. The IEGR in any OEM engine killed low end torque, we have multiple. Our off road will barely start in winter cause they won’t “torque up” against cold hyd oil to reach higher RPM.
Mack quotes in the AI manual “Design to run high RPM in a vocational application”. AKA- Drive it like you stole it, keep the fuel delivery man on speed dial, or kill the emissions system.
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It would be nice to have a fleet owner, with multiple OEM’s, dump some cost-per-hour/mile comparisons.
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Previous owner of the '05 CV713 was killing clutches and switched to electric logic fan with no further issues.
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Hollywood's Best cold, manipulative, unscrupulous, AI character to date...………...
Give me a reason they want to emulate a human, in appearance, other than to manipulate thought?
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Million mile engine, just get lots of cups and injectors on the shelf.
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2 hours ago, 41chevy said:
The Chinese are set on having a Moon Base in 10 years, after that there will not be a spot on earth without a bullseye on it.
https://spacenews.com/pentagon-report-chinas-space-program-continues-to-mature-rapidly/
https://www.politico.com/story/2018/04/06/outer-space-war-defense-russia-china-463067
https://www.politico.com/story/2018/11/24/the-democrats-nuclear-options-966502
General Tsu’s Chicken served daily at the Sea of Traquillity Bar and Wok?
It’s not practical to keep humans in space for extended periods, but, I’d guess, when A.I. is perfected space property is going to be in high demand for military and natural resource. Put a solar panel on the little Creton’s forehead and he can open pit mine all day long on Mars without Labor Union representation. Think robots are going to get to do and see all the things humans dreamed about, so far as deep extended space travels.
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22 minutes ago, Quickfarms said:
Here is a link to these
https://www.hotrodshiftknob.com/search.php?search_query=Mack§ion=product
You can also search on eBayHahahaaa... they are Tmuchs on the advertisement too.
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Never visualized the death toll of WW2 until recently reading that 1 in every 34 people on Earth died from the war. That’s without counting fatalities from disease, famine, etc caused by conflict. Unfathomable destruction, now days they measure homicide/accidental death/ in 4-8 per 10,000.
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A pastor and I previewed Ken Ham’s “answers in Genesis” and were convinced we needed some Vegemite. Rock, paper, scissors and I ended up mail ordering some. Definitely an acquired taste, beef bouillon with a hint of stale beer. Ham said you can’t convince an American kid to eat vegimite and even less an Australian kid to eat a pickle.....appears he was right after letting the kids taste it.
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Cure for Cancer
in Odds and Ends
Posted · Edited by Mack Technician
I've been experimenting for years on a cure for salt cancer. This stuff is the best and worst out there. Best because it works like a charm at sealing out salt and water and is impossible to wash off, worst because it is impossible to deal with when it gets on you. It doesn't just get on you, it bonds to you and becomes integrated to your body for the next week or two. We use it at the facility to lubricate massive, slow RPM, turntable gears. The consistency is liquid for the first 10 minutes then it becomes a black petroleum gum similar to pine pitch. In cold weather and after years in service it stays soft and shiny, you can cut it with your fingernail. After I rebuilt my Meat Collector Edition F150 I coated it, top to bottom, and all drivetrain units. I did interior body pockets and dead spaces, door interiors, included foot-salt run off zones, beautiful. Has no residual smell even on a hot day.
When I did the tank I set it on my chest while lifting, it ripped holes in my bio-hazard smurf suit and tore my thin latex gloves. Small price to pay for an eternally mummified steel. In time it loses it's surface tackiness.