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1. What are the consequences of a failure in the minimum pressure check valve, which prevents it from closing? 1) The oil level in the tank does not rise after the machine starts up, resulting in the air compressor being unable to handle any load. 2) The oil content in the exhaust air increases. 3) Air from the outside can flow back into the machine, preventing the pressure in the oil tank from dropping when the machine is not in use, and causing the air compressor to spill oil after it stops operating. Remove the minimum pressure check valve for maintenance; if it is faulty, replace it with a new one. 2. What are the consequences of a broken drive belt? 1) The machine cannot handle any load after starting up. 2) During operation, the oil tank pressure will drop to 0 kg, and pressure output will cease. Check the cause of the belt breakage and install a new belt. 3. What are the consequences of the intake valve not being able to close? 1) It will cause the pressure in the air compressor to continue rising even when the machine is not in use, leading to the safety valve discharging air. 2) The oil tank pressure rises when the vehicle is empty. 3) When the vehicle is parked, the cooling oil flows back out through the intake port. Remove the intake valve for maintenance; if it is damaged, replace it with a new one. 4. What are the consequences of poor contact at the starter’s connection points? 1) The motor’s operating current increases, leading to motor overload. 2) Fault caused by overheating of the starter. 3) The fuse is burned out. Remove the starter for maintenance. 5. What effects will low, high voltage, or three-phase imbalance in the external power supply to the air compressor have on the machine? 1) A low supply voltage can cause the motor to overload. 2) An excessively high supply voltage can cause the motor resistance to decrease, leading to burnout. 3) Three-phase imbalance in the supply voltage can cause motor overload.