When operating machinery in cold conditions, several precautions should be taken to ensure safety and prevent damage [1]. When the ambient temperature is low, starting the engine may be difficult due to decrease of oil liquidity, and the radiator may be damaged due to coolant freezing [1]. It is important to use good low-viscosity fuel/oil for each device [1]. The additive rate of the cooling system should match the expected minimum outdoor temperature [1]. Check the coolant frequently to keep an appropriate concentration [1]. When the ambient temperature is low, the battery capacity may decrease and the battery electrolyte may freeze [1]. Charge the battery full earlier than the specified interval and pay full attention to thermal insulation by covering the battery [1]. Remove mud and water stuck to the machine sufficiently [1]. Especially, be sure to drain off the water from the travel system, and then park the machine on a dry and firm ground to prevent the travel system from freezing [1]. Wipe the cylinder rod completely [1]. If frozen mud or water is stuck to the cylinder rod surfaces, the seal may be damaged when retracting the cylinder [1]. Retract each cylinder to the minimum size to minimize the exposed area of the rod [1].