Traktor mit Schmierungssystem

摘要

A system is provided for lubricating and cooling a remote drop box 55 for a hydrostatically driven four wheel drive tractor 10. The hydrostatic motor 25 is operated very close to its maximum rated operating speed during roading in order to maximize drawbar pull and road speed capability for a variable hydrostatic motor 25, leaving very little margin for overspeeding that occurs when the tractor 10 is roading downhill. An electronic overspeed control 23 is provided to provide dynamic engine braking. When the hydrostatic drive is used with a high torque engine 13, the available charge pump flow drops as the engine speed drops, and eventually reaches a point where the required servo pressure to maintain the hydraulic pump 22 in stroke cannot be maintained. Such a condition is alleviated by the supplemental charge flow system 60. Stabilization of the load sensing hydraulic system, which is subject to rhythmic flow pulsations or surging, particularly when flow compensators in valving interact with the flow compensator of the hydraulic pump 24, is accomplished with an attenuator/hose assembly 43, 45.