Patent ID: 8447476

Claim:
A lubricating oil supply control device for a construction machine configured to control an amount of a lubricating oil to be supplied to a transmission of the construction machine that transmits power from an engine to the transmission through a torque converter with a lock-up clutch, the lubricating oil supply control device comprising: a clutch-state determining section configured to determine whether or not the lock-up clutch is set to be in a coupled state; a lubricating oil amount detecting section including an engine speed detecting section configured to detect an engine speed, and a limit engine speed time counting section configured to determine whether or not the engine continuously rotates at a predetermined limit engine speed or less for a predetermined period of time, the lubricating oil amount detecting section being configured to detect whether or not the amount of the lubricating oil to be supplied to the transmission is short of a preliminarily set supply amount based on a result counted by the limit engine speed time counting section; and a lock-up clutch controlling section configured to set the lock-up clutch to be in a decoupled state when the lock-up clutch is set to be in the coupled state and the amount of the lubricating oil to be supplied to the transmission is short of the preliminarily set supply amount.