Hydraulic excavator capabilities have expanded far beyond excavation tasks with buckets. With the advent of hydraulic-powered attachments such as a breaker, a grapple or an auger, the excavator is frequently used in many applications other than excavation. Many excavators feature a quick coupler for simplified attachment mounting, increasing the machine's utilization on the jobsite. Excavators are usually employed together with loaders and bulldozers. Most wheeled, compact and some medium-sized (11 to 18-tonne) excavators have a backfill (or dozer) blade. This is a horizontal bulldozer-like blade attached to the undercarriage and is used for levelling and pushing removed material back into a hole.
I was happy with my $9,000 purchase price, if not a little stunned. Except for our house, which was only possible thanks to a big mortgage, this was the largest single purchase I’d ever made. More than my truck. More than my wife’s car. But auction houses charge additional fees that you need to be mindful of. At the auction I attended, the buyer’s fee was 10 percent for total sales under $1,000 and 1 percent for sales above $1,000. Credit card payments were an additional 2 percent, which I was OK with because I got the equivalent of 3 percent cash back in points and had the dinero to pay it right off – thanks to months of tight living.
The two main sections of an excavator are the undercarriage and the house. The undercarriage includes the blade (if fitted), tracks, track frame, and final drives, which have a hydraulic motor and gearing providing the drive to the individual tracks. The house includes the operator cab, counterweight, engine, fuel and hydraulic oil tanks. The house attaches to the undercarriage by way of a center pin. High pressure oil is supplied to the tracks' hydraulic motors through a hydraulic swivel at the axis of the pin, allowing the machine to slew 360° unhindered.
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