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"
Whatever happened to landing gear with rollers?
Discussion in 'Questions From New Drivers' started by TomCougar, Dec 9, 2019.
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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.
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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.
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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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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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