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Thread: LT 230 CDL mechanism How does it work?

  1. #1
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    LT 230 CDL mechanism How does it work?

    I have been trying to get my head around how the CDL actually works. I know that the dog clutch slides along the shaft and locks the front shaft, but how does it lock the rear shaft. From what I can see, it locks against the diff carrier, which would leave the rear shaft free to rotate. Which it doesn't Any images out there? I've not found any.

    Thanks

    Julian
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  2. #2
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    LT 230 CDL mechanism How does it work?

    It locks the front shaft to the differential case. This prevents differential action. It is the same way all manual lockers work.

  3. #3
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    Is not the rear shaft free to move? That's the bit I do not get.
    D2a Td5 Manual, Chawton White. aka "Daisy"
    Build date 11th Oct 2003
    Freelander 2 2011, manual, the daughter calls it Perri
    Before I had a Land Rover I did not have any torque wrenches. Now I have three.
    LROCV #1410

  4. #4
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    Quote Originally Posted by Bohica View Post
    Is not the rear shaft free to move? That's the bit I do not get.
    Or think of it this way, the high/low hub drives the rear shaft and diff case, and the front shaft drives through the centre diff pinion.
    The CDL just locks the front output shaft to the diff case.

  5. #5
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    so.

    unlocked the power comes into the diff carrier
    the power is then transmitted to the spider gears
    the spider gears then apply power to the front and rear (or left and right) side gears which drive the axles (and then the wheels or the next diff)

    when we lock the CDL (or any other mechanical locker)

    the power comes in on the diff carrier.

    the CDL locks the front side gear (or left or right for a normal diff) to the diff carrier.

    power is now applied to the diff carrier and then to the front (or left or right) side gear

    the front (or left or right) side gear now applies power to the spider gears

    the spider gears are more or less fixed to the diff carrier (theres some slop) which is turning at the same speed as the front axle and so they are unable to rotate

    the spider gears (once the slop is taken up) now apply power to the rear (or right or left) side gear.


    this is about the best single video I could find that provides a clean demo of the power transfer.

    YouTube

    this one gives a pretty good verbal description of what it does, just not how and covers a couple of other options.

    YouTube
    Dave

    "In a Landrover the other vehicle is your crumple zone."

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  6. #6
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    Quote Originally Posted by Bohica View Post
    Is not the rear shaft free to move? That's the bit I do not get.
    The gist of the CDL is that both propshafts are locked together so they act like one, here's the description from the workshop manual

    Differential lock
    The differential lock selector housing is bolted to the top of the output housing, the selector finger passes through the
    housing, locating in a slot in the differential lock selector shaft. The differential lock selector shaft passes through the
    selector fork which is located beneath a plate bolted to the side of the output housing. The selector fork engages the
    dog clutch sleeve with the differential rear shaft when the splines of the sleeve and differential rear shaft are aligned.A
    spring loaded detent ball fitted in the output housing locates in grooves in the shaft.
    Discovery Td5 (2000), manual, tuned

  7. #7
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    Quote Originally Posted by Bohica View Post
    Is not the rear shaft free to move? That's the bit I do not get.
    No.

  8. #8
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    Thanks to all the contributed. It make sense to me know. Took a while
    D2a Td5 Manual, Chawton White. aka "Daisy"
    Build date 11th Oct 2003
    Freelander 2 2011, manual, the daughter calls it Perri
    Before I had a Land Rover I did not have any torque wrenches. Now I have three.
    LROCV #1410

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