thomas. Excavator. May 21st , 2018.
Attached to the end of the boom is the stick (or dipper arm). The stick provides the digging force needed to pull the bucket through the ground. The stick length is optional depending whether reach (longer stick) or break-out power (shorter stick) is required.
Modern hydraulic excavators come in a wide variety of sizes. The smaller ones are called mini or compact excavators.7 For example Caterpillars smallest mini-excavator weighs 2060 pounds (930 kg) and has 13 hp; their largest model is the largest excavator available (a record previously held by the Orenstein & Koppel RH400) the CAT 6090 which weighs in excess of 2160510 pounds (979990 kg) has 4500 hp and a bucket as large as 52.0 m³.
Hydraulic excavators usually couple engine power to (commonly) three hydraulic pumps rather than to mechanical drivetrains. The two main pumps supply oil at high pressure (up to 5000 psi) for the arms swing motor track motors and accessories while the third is a lower pressure (~700 psi) pump for pilot control of the spool valves; this third circuit allows for reduced physical effort when operating the controls. Generally the 3 pumps used in excavators consist of 2 variable displacement piston pumps and a gear pump. The arrangement of the pumps in the excavator unit changes with different manufacturers using different formats.
Any content, trademark/s, or other material that might be found on this site that is not this site property remains the copyright of its respective owner/s. In no way does thomaskc.com claim ownership or responsibility for such items, and you should seek legal consent for any use of such materials from its owner.