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How often should we change the hydraulic oil of the internal combustion forklift​?

How often should we change the hydraulic oil of the internal combustion forklift​?

  • 2021-06-15

How often should we change the hydraulic oil of the internal combustion forklift?


After long-term use of forklift hydraulic oil, due to various aspects of temperature, humidity, air oxygen, moisture and light, the quality of the oil will gradually deteriorate, which will directly affect the working performance of the forklift hydraulic system accessories.


The hydraulic oil of the forklift is changed every 10,000 hours under normal use, usually between 6,000 and 10,000. If it is not replaced by the expiration date, the damaged or contaminated hydraulic oil will damage the forklift hydraulic oil pump and forklift control valve, and will cause greater damage to the forklift hydraulic system accessories. Therefore, in the daily work process, if you find The forklift hydraulic oil has reached a certain period of use and should be replaced in time to avoid greater losses. When choosing hydraulic oil, pay attention to the choice of hydraulic oil brand, try to choose the original brand of genuine hydraulic oil.

2. Replacement steps.

Before replacing the hydraulic oil, please note that: it must be carried out in a clean and windless environment to prevent dust from entering the oil and parts; forklift maintenance personnel must clean the forklift hydraulic system to remove the rust from the deterioration of the oil. And other impurities; thoroughly remove the old oil in the pipelines and components to avoid affecting the service life of the new oil.

1. Turn the key switch to the open position, and use the mast cylinder to lower the forklift to the position where the tilt cylinder is pushed to the foremost position, and the fork will be slightly higher than the ground;

2. Push the tilt cylinder to the most forward position;

3. Return the control lever to the neutral position, turn off the key switch, check the connector at the front of each tilt cylinder, and take out the hose;

4. With the key switch turned off, move the control lever to the fully rearward position, let the hydraulic oil of the tilt cylinder return to the hydraulic oil tank, and use the crane to tilt the entire mast all the way back;

5. Return the control lever to the neutral position;

6. Turn on the key switch and use the crane to lift the mast cylinder to the vertical position;

7. Return the control rod to the neutral position, turn off the key switch, and take out the oil return pipe (low pressure hose) from the upper end of the lifting cylinder;

8. Use the control rod to gradually lower the bottom of the lifting cylinder to allow the hydraulic oil to pour back from the lifting/mast cylinder to the oil tank;

9. Open the drain plug of the oil tank and let the oil drain from the oil tank;

10. Put the hose and drain plug back to the original position, and refill the specified hydraulic oil. According to the type and quantity required by the forklift, add new hydraulic oil to the hydraulic cylinder of the forklift, remove the oil return pipe from the liquid storage tank, and connect it to another container. Start the hydraulic pump and connect the oil return pipe to the oil tank after the entire hydraulic system is filled with new oil. At the same time, fill the storage tank with new oil so that the liquid level is not higher than the upper marking line on the dipstick and not lower than the lower marking line on the side dipstick. During operation, forklift maintenance personnel must carefully observe the working conditions of the hydraulic pump, hydraulic cylinder, and reversing valve of the forklift hydraulic system, and check that there is no leakage in the oil pipes and pipe joints. Therefore, the oil change process ends.

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