| 摘要 |
The tool has an electrohydraulic control device, and work hydraulics whose hydro-load is permanently operable with a hydraulic base load and occasionally with a hydraulic peak load. A power unit (A) comprises two constant pumps (P1, P2) with low and high delivery rates in an oil tank (R). The pump with low delivery rate covers the base load, and the pump with high delivery rate covers the peak load. A permanently operable pumps driving motor (M1) is provided for the pump (P1). A pumps driving motor (M2) is provided for the pump (P2) in the power unit. |
