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.
1994 John Deere 4960 MFWD Tractor, 180.6 Hrs Showing, 222 Hp, 7.6 L 6 Cylinder Turbocharged Diesel Engine, Powershift 15 Forward & 4 Reverse Gears, AC/Heat, AM/FM Radio, 3 Rear Sets Of Hydraulic Remotes, 3 Point, Draw Bar Hitch, Clevis Hitch, Large 1000 PTO, 14 Front Suitcase Weights, Rear Inner Weights, Rear Duals, Firestone Tires Front 16.9-30, Rear Tires 18.4R46, SN: RW4960P008173 ...more
A smart combination of a compact excavator with a compact loader, the MCR range is now available in the 6, 8 and 10-tonne class. Quite simply unique, the 6MCR is a tracked excavator that can travel at speeds of up to 10 km/h, a compact loader with 360° rotation, a construction machine that can switch from excavator mode to skid loader mode in seconds.
Fifty-five farmers and assorted country folk clustered around the auctioneer. Bidding on the New Holland was fast and fierce. Then, the Kubota was up. “$15,000, can I get $15,000,” the auctioneer sang through a megaphone. “How about 10? Can I get 10? $10,000?” My buddy Kyle had told me never to bid first. They always start high, so wait for the drop and let someone else kick it off. “Nice Kubota, backhoe, good machine, how about 7, can I get 7?” A card went up. A guy in overalls near the front had bid. “We have 7, how about 7-5, 7-5.” Shaking like baby deer, I raised my card. “7-5, in the back. Can I get 8, 8, 8?” Overalls raised his card. “8-5, 8-5.”