PUMP TORQUE CONTROLLER OF HYDRAULIC WORKING MACHINE

摘要

[Object] To permit an precise and easy adjustment of a pump absorption torque of a main pump in accordance with environmental conditions or the like when a sub-pump different in characteristics from the main pump is connected to a prime mover. [MEANS FOR ACHIEVING THE OBJECT] An adjustment switch 25 is arranged. A main controller 12 includes a processor means for setting the level of an absorption torque of a cooling fan pump 20 at a maximum absorption torque in use, a processor means for incrementing an adjustment target absorption torque for a main pump 13 at a slow rate from a sufficiently small pump absorption torque, a fourth determination means for determining if a difference between a load factor of an engine 3 and a target load factor falls within a predetermined range, a processor means for repeating loading of a load factor signal and the increment of the adjustment target absorption torque as long as "NO" is determined by the fourth determination means, and a processor means for storing the adjustment target absorption torque or the like as an adjustment value AdjVal when "YES" has been determined by the fourth determination means, and a processor means for limiting by the adjustment value AdjVal a target absorption torque computed by a torque limiter means.