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An extended reach design uses multiple hinges and parallel lifting bars on the loader arm, with the main pivot points towards the center or front of the machine. This allows the loader arm to have much greater operating height while retaining a compact design, and allows the vertical movement to be less of an arc and more straight-up vertical, to keep the bucket forward of the operator's cab, allowing safe dumping into tall containers or vehicles.
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.
IVT, ILS, Front Duals, Prem Cab, Active Seat, 7" Color TouchScreen, Michelin 480R50 Rear, Michelin 420R34 Front, 5 Hyd, Big Hyd Pump (60GPM), 18300# 3 Point, HID Lights, Front Fenders, Rear Fender Ext, Cat 4 Drawbar (No HD Sppt), 1000 PTO, 1 Pr 1400# Rear Wgts, 8 Front Wgts, XM Radio, Leather, Radar, Biz Band Ant, Cold Weather Pkg.|Front Weight Support with 8 Front Suitcase Weights and One Pair of 635 kg (1400 lb.)|Cold Weather Start Kit|Auxiliary Hydraulic Connections|John Deere PowerTech PSX 9.0 L (549 cu. In.) 6 Cyl IT4 / Stage 3b Compliant Diesel Engine|Foot Operated Speed Control|Antenna Mount and Wiring for Business Band (2-Way) Radio|Radar, Dual Beam Sensor|Leather Trim Package|Fenders, Full Coverage Rear 2.55 m (100 In.) Width|Fenders, Deluxe Pivoting Front for MFWD or ILS -480 mm (18.9 In.) Wide|480/70R34 In. 146A8 R1W Radial in Dual Wheel Configuration|Premium Lighting|John Deere Independent Link Suspension with Hydraulic Differential Lock, Fully Enclosed Driveline and Dual Tyre Capabili|480/80R50 In. 159A8 R1W Radial in Dual Wheel Configuration|120 mm (4.72 In.) Diameter x 3010 mm (118.5 In.) Length with Double Taper Wheel Hubs|Cat. 4 Adjustable Swinging Drawbar with 50 mm (2 In.) Pin with Heavy Duty Support|8,482 kg (18,700 Lb.) Lift Capacity Hitch (Cat 4N/3) Hitch with Sway Blocks and Quick Coupler|45 mm (1-3/4 In.) 1000 rpm PTO (20 Spline)|Five Remote Selective Control Valves with Push/Pull Breakaway Couplers and High Pressure Relief Levers|227.1 lpm (60 gpm) 85 cc Hydraulic Pump Displacement|Premium Radio Package with XM Radio|Premium CommandView II Cab with Active Seat|Touchscreen GS3 CommandCenter 7 Color Display, Video Capable|AutoPowr IVT Transmission 42 km/h (26 mph) with Right Hand Reverser Controls ...more
The original skid-steer loader arms were designed using a hinge at the rear of the machine to pivot the loader arm up into the air in an arc that swings up over the top of the operator. This design tends to limit the usable height to how long the loader arm is and the height of that pivot point. In the raised position the front of the loader arm moves towards the rear of the machine, requiring the operator to move extremely close to or press up against the side of a tall container or other transport vehicle to get the bucket close enough to dump accurately. At the highest arm positions the bucket may overflow the rear of the bucket and spill directly onto the top of the machine's cab.