Mac 8spd maxitorque es t300

Discussion in 'Experienced Truckers' Advice' started by Pats6861, Feb 25, 2024.

  1. Pats6861

    Pats6861 Bobtail Member

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    Feb 25, 2024
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    Hello, in CDL school I learned on.a Mac that had a 10 speed Eaton and I could down shift that one no problem, I would let the rpm's come down to 10 clutch to neutral than tap the accelerator than clutch to gear. The truck I am driving now is a Mac 8 speed with a maxitorque es t300 transmission and I can't downshift for crap now. I read through the manual and searched online and can't find anything on the shift rpm's and the other drivers at my job go by the engine sound and float their gears so they are not much help. I definitely struggle shifting from say 5th to 4th or 5th to 3rd. Can anyone give me some pointers please
     
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  3. snowwy

    snowwy Road Train Member

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    Most of us float the gears and never touch the clutch unless stopped.
     
    shanman Thanks this.
  4. Pats6861

    Pats6861 Bobtail Member

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    Feb 25, 2024
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    That's the problem I am running into, there isn't anyone who can help with with the rpm range until I get a little experience and start learning how to float the gears. I even tried floating the gears and grind to much
     
  5. Ridgeline

    Ridgeline Road Train Member

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    First keep doing what you are doing to shift, don’t worry about what others do, you are you.

    second take note of where you upshift, seeing you are using a 308 Mack, if I was driving it, I would split the second gear and go through the four others hitting 1850 and on the way down shift around 1200. But this is me, I’ve driven almost everything on the road.
     
  6. Pats6861

    Pats6861 Bobtail Member

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    Feb 25, 2024
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    Thanks I try that
     
  7. Judge

    Judge Road Train Member

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    Watch rpm’s when you shift.
    Instead of 400 rpm’s be probably closer to say 600 rpm’s between gear, be same when downshifting go to a grand then bump it up to that many and it’ll fall into gear
     
  8. abyliks

    abyliks Road Train Member

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    Maxi torque transmissions are some of the biggest piles of crap right next to meritor, usually about the time I remember how to shift them is when it’s time for me to get back into my own truck

    did you mention what was under the hood or did I miss it? Don’t know a lot about the new ones rpm wise, but the old 237/300/350s low rpm was 1200 up to 2100 I think?
     
  9. Pats6861

    Pats6861 Bobtail Member

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    Feb 25, 2024
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    Don't remember the year. I just know it's a Mac pinnacle 8 speed maxitorque ES t300 transmission. It's at least 10 years old
     
  10. Dave1837

    Dave1837 Road Train Member

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    Is that the 8 speed with the blue range selector? If I remember right you shift 1-2 select high range then 3-8. Try allowing 400 rpms between 1-4 and maybe 500 between 4-7. Probably 550 between 7-8. Those Maxitorque transmissions are some of the most arrogant transmissions I've ever ran, but they're definitely the toughest. If you can learn to shift one of those you'll be able to drive anything
     
  11. Pats6861

    Pats6861 Bobtail Member

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    Feb 25, 2024
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    It's 1-4 low range than 5-8 high range and it also has just one low gear, I would assume it's for getting started with a heavy load on a incline and two reverse gears.
     
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