See more detail, please visit www.wondee. After the vehicle is used for a period of time, due to the frequent drops and hooks of the tractor and semi-trailer, necessary maintenance shall be carried out for the king pin: remove the oil sludge on the king pin (the oil sludge contains a lot of sand, which will aggravate the wear of the king pin) and supplement new grease. During initial use, add an appropriate amount of grease around the end of the king pin ī. The king pin must be replaced when the wear of the king pin reaches the wear limit.Ī. Adjust the position of the lock bolt of the fifth wheel to eliminate the gap between the king pin and the lock hook ī. Regularly check the above items according to the instruction manual of each automobile manufacturer.ĭuring the running of a semi-trailer, the king pin rotates relative to the fifth wheel, causing the king pin to wear. Otherwise, replace the self-securing bolt and tighten it according to the specified torque.Į. Check whether any self-securing bolt is loose or broken. Check the skid plate for scars, distortion and foreign objects, otherwise it will cause abnormal wear of the king pin ĭ. It's all part of distinguishing yourself out here as a driver who can Run With The Big DogsĪ set of axles spaced close together, legally defined as more than 40 and less than 96 inches apart by the USDOT.C. That took enough weight off the back end of my trailer so that I could close them up for the rest of the trip. I had two stops before I got to Maryland. But the load was going up through Maryland and Connecticut where my axles needed to be closed due to their laws and strict enforcement of them. Recently I had to have my axles open to be legal with the weight at the rear of my trailer. As a flatbed driver I deal more with open and closed axle issues. Occasionally you can fudge a little on multiple stop loads, but you better be sure you know what you're doing. You make sure you are legal in each of the states you're traveling through before you leave your shipper. It becomes second nature - you just get to know the whole country and the way the rules are applied in the different states. Most drivers know this stuff instinctively if they deal with it often. Marc, you're not driving currently and it sounds overwhelming. I go from Louisiana up into the Northeastern states regularly. I guess my concern would be keeping track of when one is headed into or through a more restrictive State or states and how to manage that.Īs these settings affect weight distribution (axle weights, etc.) how does one deal with such things? Can't just head back to shipper to rebalance or offload trailer!) Do you set tandems and scale for the most restrictive state one will pass through? Tractor tandems are generally just referred to as "drives" which is short for "drive axles". You might hear a driver say, "I'm 400 pounds overweight on my tandems", referring to his trailer tandems, not his tractor tandems. Drivers tend to refer to the tandem axles on their trailer as just "tandems". Tandem: Tandem AxlesĪ set of axles spaced close together, legally defined as more than 40 and less than 96 inches apart by the USDOT. Tandems: Tandem AxlesĪ set of axles spaced close together, legally defined as more than 40 and less than 96 inches apart by the USDOT. This is where the driver will pick up a load and then deliver it to the receiver or consignee. The customer who is shipping the freight. Here is a very easy to understand reference list of kingpin law in each state (column on the far right is "Diagram" and refers to the second image shown below): West Virginia being the true oddity (?) 37' with no specified diagram. Diagram 1 is to center of the rear axle, Diagram 2 is center of the rear tandem (center point between the last 2 axles in the event of a 3 or 4 axle trailer). Although 41' is definitely more common, it depends on the state, and also the diagram they use. The 41' mark is only relevant for states using that measurement for their law. Please complete the fields below to send your friend a link to this. Marc, the movable, adjustable fifth-wheel has no bearing on this at all, distance for setting the tandem is measured from the KingPin which is fixed. This has been a "standard" for 53' trailers since national adoption in the early 90s. KingPin is 3' (not 3") from the edge of the trailer front. And yes the scale house computers take pictures and determine your measurements. 9' from the rear of the trailer is 41' from kingpin. Majority of newer trailers have a 3" from the trailer nose to the center of the kingpin.
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