question(s) for the Mechanics

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by 85COE, Mar 25, 2020.

  1. SmallPackage

    SmallPackage Road Train Member

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    Marion Texas
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    Cabovers have all the weight up front on the steers so if you got the center of the plate dead center of the tandems or a hair behind you should be good for just about anything. Our old ‘73 Pete 352 had a early Holland slider on it but it never moved.
     
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  3. 85COE

    85COE Light Load Member

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    Aug 6, 2019
    Columbus, Ohio
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    the shop working on it has a 5th wheel with a 54" rail, but trying to keep costs down to start, which is why i mentioned running it as is for a month or so before replacing it

    there is a link in this thread with pics. i'll have to see which one has the best shot of the 5th wheel. it's not dead center over the drives
     
  4. 85COE

    85COE Light Load Member

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    Aug 6, 2019
    Columbus, Ohio
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    okay, this is a link to the driver side view, and you can see where the 5th wheel is situated

    Box

    here is one from the psgr side

    Box
     
  5. BoxCarKidd

    BoxCarKidd Road Train Member

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    KIMG1321 (1).jpeg As Deere hunter said: What's wrong with it?
    Many of the fleet 4070 and 9670's I remember liked the kingpin just forward of center. Related to wheel base and what you are pulling. Looks like about where yours is at.
    Some sliders were manual but I thank yours has an air cylinder on it. Does it get air to it from the switch on the dash? Does the cylinder leak? If that is OK tap on the locks from the inside out while it has air to the cylinder. Get the locks out and it should slide.
    250 small cam
     
  6. Michael 247

    Michael 247 Heavy Load Member

    767
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    Nov 20, 2017
    Dublin Va
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    Spray PB Blaster on the locks and slide plate 2 or 3 times a day and you will probably get it to slide ..Also spray all the moving parts..
     
  7. 85COE

    85COE Light Load Member

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    Columbus, Ohio
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    the 5th wheel was blocked into place, and because it's been there so long, it's fused into place and i am unable to slide the 5th wheel at all. So, the point of replacing it a little later is in case i need to slide it to shift the weight. right now, it's not quite in the center of the tandems.
     
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  8. SmallPackage

    SmallPackage Road Train Member

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    Marion Texas
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    Have you tried breaking it loose with loaded trailer on it yet? Do like @Michael 247 said. PB it. Everyday. Use a lot. Tap on it with a heavy hammer. Don’t damage the teeth but give it daily knocks. OxyAcetylene heat can help also.
    Make sure the locks are fully releasing and with a loaded trailer on it on a paved or concrete surface very slowly and easy (2-5 mph) in low or first gear and low reverse keep pulling trailer brake to slam stop the truck fore and aft to see if you can break it loose. You can also try running the landing gear down until it lightly lifts up the fifth wheel plate. Set trailer brakes and rock truck in foreward and reverse to see if it breaks loose. I had to do all of this on my old White 4000 that was frozen solid with rust and portland cement dust buildup. Has worked fine ever since.
    After you break it loose run it all the way up and clean off crud. Than all the way back and clean off crud. Lube it up and a couple times a year and run it up and down the range to make sure it doesn’t stick again.
     
  9. Dino soar

    Dino soar Road Train Member

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    All good advice.

    Once you make one hundred percent certain that the air cylinder is releasing the fifth wheel eventually it should break loose for you.
     
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  10. rolls canardly

    rolls canardly Road Train Member

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    mt. pocono. pa.
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    To continue beating this dead horse,
    There is an oil you may, or may not, know of - called "Kroil Oil; the oil that creeps."

    I have one of those pressurized metal spray cans w/air chuck fitting on it.
    Pour it in, air it up to 30 lbs, and go. I have a gallon can from an old job 30 years ago.
    I don't know if they even make it anymore, but is the best penetrating oil
    I ever found in 45 years of working on rusted up crap.
    Do an internet search for "Kroil Oil."
     
  11. BoxCarKidd

    BoxCarKidd Road Train Member

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    Still around and good stuff.
     
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