How Often is The Forklift Hydraulic Oil Replaced and The Replacement Steps
Mar 16 , 2023
 First, how often is the forklift hydraulic oil replaced?
After long-term use of forklift hydraulic oil, the quality of the oil will gradually deteriorate due to the effects of temperature, humidity, air oxygen, moisture, and light, which will directly affect the performance of forklift hydraulic system accessories. The normal use of forklift hydraulic oil is changed every 10,000 hours, generally between 6,000 and 10,000. If the service life is not replaced, the deteriorated or contaminated hydraulic oil will damage the forklift hydraulic oil pump and forklift control valve, and will cause greater damage to each forklift hydraulic system accessories. Therefore, in the daily work process, if found 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, and try to choose the original brand hydraulic oil.
Second, the replacement steps.
Before replacing the hydraulic oil, it should be done in a clean and windless environment to avoid dust entering the oil and spare parts; forklift maintenance personnel must clean the hydraulic system of the forklift to remove the rust from oil deterioration and other impurities; completely remove the old oil in the pipelines and components, so as not to affect 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 fork will be slightly higher than the ground when the tilt cylinder is pushed to the front;
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. When the key switch is turned off, move the control lever to the full back position, let the hydraulic oil in the tilting cylinder be poured back into the hydraulic oil tank, and use a crane to tilt the entire mast backward;
5. Return the control lever to the neutral position;
6. Turn on the key switch, and use a crane to raise the mast cylinder to a vertical position;
7. Return the control lever 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. Gradually lower the lifting cylinder with the control rod, and let the hydraulic oil pour back from the lifting/gantry cylinder to the oil tank;
9. Open the drain plug of the oil tank to let the oil drain from the tank;
10. Put the hose and drain plug back in place, and refill the specified hydraulic oil. According to the variety and quantity required by the forklift, add new hydraulic oil to the hydraulic cylinder of the forklift, remove the oil return pipe on 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 liquid storage tank with new oil initially, so that the liquid level is not higher than the upper mark line of the oil dipstick, nor lower than the lower mark line of the side oil dipstick. During operation, forklift maintenance personnel must carefully observe the working conditions of the forklift hydraulic system hydraulic pump, hydraulic cylinder, and reversing valve, and check that there is no leakage in the oil pipes and pipe joints. Thus, the oil change process ends.
Third, the following matters need to be paid attention to when changing the hydraulic oil of the hydraulic system:
1. After draining the hydraulic oil from the oil tank, completely remove the sediment at the bottom of the oil tank;
2. After draining the hydraulic oil from the oil tank, replace it with a new micro-filter;
3. Thoroughly clean the oil filter and oil filter cover;
4. Before checking the hydraulic oil level, verify that the hydraulic oil is indeed distributed to all forklift hydraulic fittings and pipelines. Refill qualified hydraulic oil to the position between the uppermost and lowest marks on the scale rod.
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