Scrapers were originally designed to be pulled behind horses in order to construct canals and ditches in the American west. Modern day counterparts are most commonly found in mines or on very large highway construction projects, but the principle of lifting cut earth in a C-shaped bowl remains the same.
There are various types of scraper designed for different applications, but this guide is concerned only with self-powered elevating scrapers. The ‘elevating’ part of the name simply refers to the conveyor belts used to move the cut earth between the blade and the hopper, and not (as is sometimes thought) anything to do with the way the earth is cut.
As an elevating scraper is a relatively ‘clean’ piece of equipment, you should regard signs of abuse with particular suspicion. Starting at the cab, look at the roll cage.
While a rollover protection structure (ROPS) isn’t mandatory in Arabia, the chances are that the machine will be fitted with one. Check for damage or interference as buying a machine that has spent time shiny side down could obviously prove costly in the longer term.
GOOSENECK
The ‘gooseneck’ joint between the two sections of the machine is critical, so make sure you check it carefully. Engage the pan in the ground to check for extra play.
In addition, pay attention to the visible sections of the hydraulic arms in this area. If they look bent or otherwise broken, then it is an indication that the machine hasn’t been used correctly.
Moving to the rear of the machine, check that the conveyor works as it should with no missing flights. The most important part of the scraper is the blade, so ensure that it’s in good shape.
Also at the rear of the machine, it pays to examine the stinger structure, which extends outwards from the bowl. Self-powered scrapers shouldn’t be pushed or pulled, although in reality it does happen. Damage can result from attempts to do this.
TANDEM
Most elevating scrapers make do with one power unit situated at the front of the vehicle, though very large machines, known as ‘tandems’, have an extra engine to power the rear wheels. Look for tell-tale signs of water or oil sprayed over the engine.
Most modern scrapers have two axles, but older machines may have three. Whatever the number, they all need to be straight and free from cracks and leaks. Bear in mind that industrial tyres are extremely expensive to replace, so factor this in when calculating your offer.
The best advice is probably to learn about your specific model. Elevating scrapers are often configured to order, so ensure that the unit you’re viewing has the necessary specifications to perform your required applications.
