An LDD model of a Cat 657 Scraper being hauled on a heavy-duty lowloader, done at a 4-wide scale (i.e. 1 stud = 2 feet).
About this creation
This LDD model is the latest addition to my series of 4-wide heavy transports and construction equipment -- a Cat 657 Wheel Tractor-Scraper riding aboard a heavy duty lowloader.
The Cat 657 is one of the real titans of the earth-moving industry, and is one of the largest and most powerful machines built by Caterpillar. It weighs in at around 80 tons empty, and over 130 tons fully loaded. The dual-engine model boasts over 1000 horsepower (a 600 HP engine in the tractor and a 450 HP engine in the scraper).
The heavy duty lowloader trailer is loosely based on some of the trailers manufactured by Harley Murray. Each axle in the trailer is actually a pair of dual axles, i.e. 8 wheels per row (each wheel in the model represents two wheels on the actual trailer -- think of the wheels in the model as super singles). A 2-axle (16-wheel) jeep trailer is used between the tractor and the low-loader to off-load the drive axles of the tractor somewhat.
If the way the scraper is sitting on the trailer looks a bit awkward, take a look at this picture. The Cat 657s are so big that few trailers are long enough to accomodate them.
This model is now part of a Cuusoo idea. Consider supporting it if you like it.
Here are some pictures of the Cat 657 Scraper all by itself. The model has at least some of the functionality of the real thing, including articulated steering, pendular front suspension, a bowl that can be raised and lowered, and an apron that can be raised and lowered. I had to make a few compromises in the contruction, though. The actuator that works is supposed to work the apron isn't really attached to it -- it is just for show. The pins that attached the bowl to the lever arms are frictionless, so the only thing that holds the bowl up is the friction between the sides of the bowl and the lever arms themselves. Finally, I was completely unable to incorporate any kind of ejector blade in the bowl -- that was simply too much detail at this scale.
Cat 657s can be operated by themselves, but they are frequently paired with other machines to aid in the loading process. Below are a pair of 657s operating in tandem in a push-pull configuration.
The final picture is a Cat 657 being push-loaded by a Cat D9 dozer.
Quoting Karol J
Nice! Very detailed machines. I think that it can be a cool set!
Thanks. As it turns out, the trailer and the scraper are only around 500 pieces combined, which would be a pretty reasonable size for a set. There are probably a few improvements that would have to be made before it could be productized, though.