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.
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.
1942 Farmall H Tractor , Starts and runs good, good tires, PTO works, Belt Drive pulley works, converted to 12 volt, lights work, good seat. Will deliver for $2.00 per mile from Texarkana, TX 75503, first 100 miles free. Payment by Paypal , cashiers check or cash. Will accept personal check but must wait for check to clear before loading or shipping.