is this normal Transmission operation

Discussion in 'Trucks [ Eighteen Wheelers ]' started by gunner76, Jun 18, 2015.

  1. gunner76

    gunner76 Medium Load Member

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    When you push the clutch in and come to a stop with the transmission in gear should you be able to pull it out of the existing gear and go to another gear without using the clutch brake? On my truck I have to use the clutch brake otherwise it will grind. I could have sworn with my old truck that after I was stopped I could go from gear to gear without pushing the pedal down to engage the clutch brake.

    Kind of a stupid question but it's just something I noticed the other day. Usually I will put it in the gear I want to start out in before I come to a complete stop.
     
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  3. Snailexpress

    Snailexpress Road Train Member

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    Sometime it cause by bad bearing between shaft and flywheel.
     
  4. Oldman49

    Oldman49 Medium Load Member

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    Had broken clutch springs do this,,,slowly got worse. Eventually 5 out of 7 failed. 1200$ covered by warranty.
     
  5. 201

    201 Road Train Member

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    Hi gunner, pretty sure the clutch is dragging. If you can't adjust it, like snailexpress sez, it could be the pilot bearing in the flywheel ( bearing that the tip of the transmission shaft goes thru). I've had the disc springs break (twice, then went with a springless, much better) but when that happened, I lost most of the clutch travel and it chattered terribly. If you put a clutch in, go with the springless disc and replace the pilot bearing.
     
  6. fullerman

    fullerman Bobtail Member

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    I agree with you guys if the clutch was out of adjustment you would have to have excessive free travel to cause the clutch to be slightly rubbing the pressure plate with the pedal depressed and normal wear in the clutch causes you to loose free travel meaning this is either a bad clutch adjustment where too much free travel was added, broken torsional springs in the clutch disks or a seized up pilot bearing which is most likely the cause.
     
  7. gunner76

    gunner76 Medium Load Member

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    I am having issues with gaining free travel but both times I crawled underneath the truck to check the clutch it had 1/2" or gap between the throw out bearing and the front of the transmission so I just adjusted the pedal linkage to get that correct. It's happened twice now and another member suggested maybe the ear coming off the cross shaft is slipping.

    Tomorrow I'm going to stop by the shop that put it in and they are going to look at it.
     
  8. fullerman

    fullerman Bobtail Member

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    Check the bell housing cross shaft bores sometimes I run into one that has worn through the bushing and into the bell housing. Usually this will cause you not to get any stop brake. Another issue we see is the adjuster in the clutch being stripped out caused by someone attempting to adjust the clutch without having someone inside pushing in the clutch pedal. If these are not the case you are looking g at a faulty or worn out clutch.
     
  9. gunner76

    gunner76 Medium Load Member

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    just an update. I had my mechanic take a quick looks at it the other day and the bell housing is seeping a little oil and it was coating everything inside. He thought that was part of the problem so he cleaned everything up, adjusted the clutch(it was a little tight) and it works a little better but it's still not perfect. I'm going to get it in when I get a slow week to get the trans dropped to fix the leaking gasket so they'll be able to look over everything better.
     
  10. fullerman

    fullerman Bobtail Member

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    bell housing gaskets ar not prone to leak at all. Most of the time it's the lid leaking around it or if its leaking on the inside of bell housing it's more than likely the input shaft retainer which has a very close tolerance with the input shaft and always wears out when the pilot bearing in the flywheel supporting the other end of the input shaft fails.
     
  11. BullDoggin

    BullDoggin Light Load Member

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    WTF is a bellhousing gasket?
     
    201 Thanks this.
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