Rob

Gonna build another semi trailer:

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Some of you may remember the old trailer I'd acquired back in about 2010 or so. It's 42' long, single drop with hydraulic ramps on the back. All this works well and with the suspension, (Hutch 7700) adjusted as it should be, tracks perfectly straight behind a truck. Haven't seen another with my own eyes that pulls as straight really. I did cut the old neck off this trailer back in 2012 and replaced everything except the outer rails along with all new brakes and hardware. Trouble is the thing is originally from New Hampshire and is quite rusty wherever it can be although functionally it is fine.

Through the years I've been able to acquire everything needed, (suspension wise) on the inexpensive side, (staying with Hutch spring) through closeouts, dead stock, auctions, etc. to replace this trailer so going to build a new one very similar except three feet longer and 8'6" wide. I currently have 28' flat lower deck, 10' upper deck, and 4' dovetail to which the hydraulic actuated ramps attach. I'm going to lengthen the new trailer lower deck to 30', and the dovetail to 5' to lessen the "breakover" angle from the approach to the flat deck. The 10' front deck is fine as I don't run anything with a sliding 5th wheel nor plan to.  Both my B-67, and the B-61 pull this fine as do my R models. I don't really require tandem axles on the pulling units so moving to single drive air rides as I come across them so the neck length is adequate. The "breakover" mentioned is the transition from the dovetail to the flat of the trailer deck. It is still just a bit steep for automobiles but fine for trucks.

Haven't run across a set of axles yet but will probably purchase them new. Have spent a lot, and wasted a lot of time looking at rusty trailers past their service life and not too many out there in the 45' range any longer so going to build my own. Don't want a 48', or 53' trailer as too long to jockey around easily for me. Buddy at the heavy truck parts dealer I usually work with sells both Rockwell-American, and Pro-Par trailer axles. Really have no experience with either brand but both are offered in the 22.5k range I'm looking at.

Pictures will come along the way as the project starts later this spring.

 

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Remember we are like kids, and like to see pictures.   

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Nuthin. It still looks just like the photo. Still use it from time to time filling swimming pools and water wells for cattle but that's about it. Likes to have some heat in the exhaust with 5300 gallons in the water tank.....

Does a great job blowing smoke rings under power along with darkening out the sun under full engine load as it runs very well.

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I had not considered air powered ramps at all. Your setup looks interesting for certain. Also looks as if they depend upon gravity to lay down? If you could send some detailed photos I'd really be interested in the concept. Just last week I rebuilt the hydraulic pump in my trailer and the ramps function just as they should. There was a solenoid cartridge that went bad and with that replaced all is fine again. Supposed to be nice today so I'll shoot a video of them operating.

I didn't realize there was a limit on total upload space so I've been going back and deleting older photos as they were not resized down and I ran out of space.

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I can certainly take some detailed photos for you. (when snow is gone and warms up a little:D)

It is a simple system. Your are right , gravity puts ramps down. As you can imagine , they can come down fast . I release air slowly so they don't come down to fast. 

 

 

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It would be easy to dampen the downward fall and thus slow their decent with either an air valve such as a flipper, or a couple of electric solenoid valves. You would need to wye the supply line in/out so one valve was open on the inflation cycle to raise the ramps, (other line blocked) and reverse on the decent. The air line which is open for the ramps to fold down would have a restriction orifice in the line to control decent rate. I'm assuming your raise rate is satisfactory or this could be worked with also. A restriction orifice in your existing line would do the same both ways and would probably impact the ramp raising rate.

I like pneumatic controls as well as hydraulic motion if the system is designed proper. Both have their advantages, and disadvantages.

I've got a bit of time in both systems.....  

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you could probably control the rate of decent by reducing down the exhaust port. use reducer fittings till you get down to a small enough size that they come down nice and easy. 

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I reinstalled my freshly rebuilt pump and hav

11 hours ago, Rob said:

I had not considered air powered ramps at all. Your setup looks interesting for certain. Also looks as if they depend upon gravity to lay down? If you could send some detailed photos I'd really be interested in the concept. Just last week I rebuilt the hydraulic pump in my trailer and the ramps function just as they should. There was a solenoid cartridge that went bad and with that replaced all is fine again. Supposed to be nice today so I'll shoot a video of them operating.

I didn't realize there was a limit on total upload space so I've been going back and deleting older photos as they were not resized down and I ran out of space.

Here is a quick video I shot this afternoon.

 

 

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I like the airbag  idea.     

Rob, how long of stroke cylinders are on your ramps.     Scrapper buddies get gradalls in to scrap pretty often, and they have 2 cylinders on the front axle to level the truck.        I think they are only 8" stroke, and prob not long enough though.   

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They are 24" stroke tie rod cylinders. Really nothing special and most any farm type store has the type. These are 3.5" bore.

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I thought they looked alot longer.   I can get the 8" for basically free, so I was hoping.  

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Thanks. These were less than $325.00 delivered for the pair as I caught them on sale at Bailey Hydraulics. I have hoses and fittings in the shop to make everything new.

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