彻底清理油箱，将清洁盖封住后，用滤油小车向油箱中加入至少约2000L污

Thoroughly clean the fuel tank and seal the cleaning cover. Use an oil filter trolley to add at least about 2000L of anti-wear hydraulic oil with a pollution degree of no less than NAS7 level to the fuel tank. Observe the liquid level. The oil level should reach the total volume of the fuel tank. About three-quarters, let it stand still so that some of the bubbles generated when refueling are separated out. <br>Note: When refueling, insert the oil filling pipe as far as possible below the liquid level in the oil tank to reduce the generation of air bubbles;

Thoroughly clean the oil tank, seal the cleaning cover, add at least about 2000L of No. 46 anti-wear hydraulic oil with pollution level not lower than nas7 into the oil tank with an oil filter trolley, observe the liquid level, the oil level should reach about three quarters of the total volume of the oil tank, and stand still to precipitate some bubbles during refueling.<br>Note: during refueling, the oil filling pipe shall be inserted below the liquid level in the oil tank as far as possible to reduce bubbles;

Clean the oil tank thoroughly, seal the cleaning cover, add at least about 2000L of No.46 anti-wear hydraulic oil with a pollution level not lower than NAS7 level into the oil tank with an oil filter trolley, observe the liquid level, the oil level should reach about three-quarters of the total volume of the oil tank, and stand still to separate out some bubbles generated during refueling. Note: When refueling, the filler pipe should be inserted as far as possible below the liquid level in the oil tank to reduce the generation of bubbles;