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For forklifts, primary maintenance is carried out after 500 hours of operation; the operators are responsible for performing this maintenance (see table below). Serial Number Maintenance Area Maintenance Content and Requirements 1. External Maintenance: Clean the exterior of the equipment to ensure there is no dust or oil buildup. Fill in any missing paint to ensure it is clean and neat. Check and repair the rearview mirror. Second, check the lights of the safety devices to ensure they are functioning properly. Check the horn to ensure it is working properly. Check the braking system and clutch mechanism to ensure they are functioning properly. Inspection of the oil quality in the three oil circuits: all oil pipes, oil holes, oil quality, and oil volume meet the requirements. Clean the air filter, oil filter, and diesel filter; if any damage or clogging is detected, they should be repaired or replaced. The electrical equipment is in good condition, neat, clean, and secure. Inspect and tighten the grounding device. Secondary maintenance is carried out after the equipment has been in operation for 3,000 hours; it is performed by the operators. In addition to fulfilling the tasks and requirements of primary maintenance, the following actions must be taken, as well as the vulnerable components should be documented, and spare parts should be identified. First, turn off the power supply, then carry out the maintenance work (see the table below). Serial Number Maintenance Area Maintenance Content and Requirements 1 Exterior Maintenance Clean the engine until it returns to its original color. Inspect the tires, cab, etc., and repair or replace any damaged parts. Replace the sealing rings in all areas where oil seeps or leaks in the two oil circuits, to ensure no oil leakage or seepage. The three adjustment functions are used to verify the parameters of systems such as the engine system and the power transmission system, ensuring that they reach the specified values. In the four-electricity system, inspect the electrical components and circuits, and replace any damaged parts.