OPERATING THE MACHINE Warming-up Operation In cold weather, warm up the machine until coolant and hy- draulic oil temperature increases to the appropriate operat- ing temperature. 1 Slow Idle IMPORTANT: The appropriate hydraulic oil operating temperature on this machine is 50 to 80°C. Hydraulic components may be seriously damaged if the machine is operated with low temperature hydraulic oil. In case warming up the machine by relieving the hydraulic system, continuously relieve the relief valve for 10 to 15 seconds while taking a pause for 5 to 10 seconds. M1U1-01-033 1. Run the engine with engine control dial (1) turned to the slow idle position.
Do not operate the machine until the needle of coolant temperature gauge (2) starts swinging. 2. After the needle of coolant temperature gauge (2) starts swinging, turn engine control dial (1) to approx. midium position. 3. Operate the boom, arm and bucket cylinders slowly to each stroke end several times. M1U1-01-004 4. Operate the travel and swing functions slowly to allow hydraulic oil to circulate through the systems. 5. Warming up operation ends after the above operation is completed. NOTE: During cold weather season, the warm-up operation system automatically operates so that the engine speed increases for a moment even though the engine control dial is in the slow idle position.
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