Whatever happened to landing gear with rollers?

Discussion in 'Questions From New Drivers' started by TomCougar, Dec 9, 2019.

  1. TomCougar

    TomCougar Light Load Member

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    There used to be a time, the 20th century, where landing gear for trailers with airplane style wheels on them was common. What were these wheels for? What was the proper name for them? Why do they seem no longer in existence?

    Mack Trucks "YEARS"
     
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  3. DougA

    DougA Road Train Member

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    Used to call them landing gear dolly wheels. You always had to hook your airlines up first,and charge your trailer brakes,before hooking to the trailer. Otherwise you'd be chasing the trailer around in reverse,trying to get it up on the fifth wheel. 99% of those old trailers didn't have maxis,and the air would leak off and they'd just roll around when you tried to hook up.
     
  4. Moose1958

    Moose1958 Road Train Member

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    With this industry going to a drop and hook system, more and more trailers are sitting loaded. I would imagine one problem with this style of landing gear would be a tendency for it sink in the soft ground much easier than a landing gear with a large plate at the bottom.

    Forgive me, I can't understand your point about "chasing the trailer". I'm not a mechanic but I was under the impression a trailer spring brakes did NOT need to be "charged" to hold while backing under it. Also if the driver is correctly backing under the 5th-wheel is raising the landing gear off the ground a bit as it goes back.
     
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  5. wichris

    wichris Road Train Member

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    Older trailers didn't have spring brakes.
     
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  6. AModelCat

    AModelCat Road Train Member

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    No spring brakes on old trailers, just service pots. You "dynamited" them. There's a special relay valve on those old trailers called a relay-emergency valve. Its purpose is to put full trailer reservoir pressure to the service brakes when pressure is exhausted from the trailer supply line.
     
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  7. wichris

    wichris Road Train Member

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    Red, Yellow and Blue buttons.
     
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  8. AModelCat

    AModelCat Road Train Member

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    You don't need the blue button to pull an old trailer without spring brakes though.
     
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  9. wichris

    wichris Road Train Member

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    I know. Just something else that many have never seen.
     
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  10. kemosabi49

    kemosabi49 Trucker Forum STAFF Staff Member

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    Spring brake became a requirement in 1975. I worked loading sheetrock for years and sometimes we had to move trailers around with a forklift. Spring brakes stopped that.
     
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  11. AModelCat

    AModelCat Road Train Member

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    I often wonder if pole-type log trailers were exempt from that ruling. I've seen some built up until the mid 90's with just service pots on every axle.
     
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