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Thread: D6D power brakes

  1. #1
    Join Date
    Jan 2012
    Location
    Australia
    Posts
    14

    Default Issue with D6D power brakes

    Have a D6D here where the brakes when used via the hand levers are erratic in operation.

    When using the foot brakes everything works as it should.

    The issue is with cold oil clutches work as designed but pull the lever further and the right side brake is slow to start working. Often you can pull it right out to the stops and eventually it will lock the track. When the oil is warm the problem lessens and the machine is usable. Today the left side started doing the same thing sometimes, then other times it returned to normal operation.

    Pulling the lever half way just to disengage the clutch and use the foot brakes and there are no issues.

    Seems to make no difference whether at high or low revs and cannot find a way to make the issue happen consistently. There are signs the machine in recent times has been worked on in that area,blue silicone and red cat gasket material showing up there. It is a new machine to me)

    I am suspecting an issue with the control valve, and hoping as it can be got at without tilting the cab.

    Anyone have any ideas? Given the clutch operation is unaffected would I rule out cross shaft bearings?

    Put a gauge on the pressure port of the brake actuation part might tell me more. The machine is still quite usable, but not how it should be. And yes the brakes are adjusted up correctly.
    Last edited by .RC.; 05-29-2020 at 12:30 AM.

  2. #2
    Join Date
    Dec 2006
    Location
    victoria australia
    Posts
    3,471

    Default Steering Clutch And Brake System Tests

    Hi R.C.
    The following test procedure may help--yes, it does cover the machines listed but, the D6D should be the same/similar--we used this at The Dealer for all later alike systems, but used the Service Manual pressure specs. for the particular later machine.
    Sorry, the pages I have are photocopies handed out at a Cat Of Aust. Powershift Trans. Course I did in Oct. 1965.

    Hope this helps.
    Cheers,
    Eddie B.
    Attached Images Attached Images

  3. #3
    Join Date
    Jan 2012
    Location
    Australia
    Posts
    14

    Default

    I will have to get some pressure testing gear then.

  4. #4
    Join Date
    Nov 2006
    Location
    South Africa
    Posts
    174

    Default

    RC,
    Maybe I missed it, but I didn't see the following info at a quick glance through the service manual: https://ch-part.com/i.caterpillar/smhs83540001/

    Reckon if your linkage adjustments from lever to valve are all correct, then the control valve is the next step.

    Most instructions for any work under the seat on the D4E, D5B, D6D start with '1. Remove Cab, 2. Remove Operater Station'

  5. #5
    Join Date
    Jan 2012
    Location
    Australia
    Posts
    14

    Default

    Thanks Glum, that is a good start to find the problem and I would suspect will fix it. It has been awhile, I hope you have upgraded from satellite internet by now.

  6. #6
    Join Date
    Nov 2006
    Location
    South Africa
    Posts
    174

    Default

    Yes, RC, its been a few years.
    We have progressed a bit, but nothing happens fast in these parts
    That D6 with aircon looks like a nice upgrade from the old D4D.

  7. #7
    Join Date
    Jan 2012
    Location
    Australia
    Posts
    14

    Default

    Yes I do not miss this one bit.

    20200511_130249.jpg

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