HYDRAULIC DRIVE OF SELF-PROPELLED BOON CRANE Russian patent published in 1995 - IPC

FIELD: load-handling machinery. SUBSTANCE: hydraulic drive has main pumps 1 and 2 driven by crane engine and communicating through hydraulic control valve units 12 and 24 with hydraulic motors 13 and 27 and hydraulic cylinders 8-11, 14 and 15 of crane mechanism. Hydraulic drive has also hand-operated auxiliary pump 3 valves 20 and 29 and filter 32. Check valves 5, 23 and 34 are installed on delivery lines 4, 22 of main pumps 1 and 2 and auxiliary pump 3. Delivery line 33 of auxiliary pump 3 is connected with delivery lines 4 and 22 and hydraulic control valve units 12 and 24 through check valve 34 and valves 35 and 36. EFFECT: enhanced reliability of operation. 1 dwg