Created on:2022-03-30 13:17

A simple method of changing hydraulic oil of forklift

A simple method of changing hydraulic oil of forklift

The hydraulic oil used in the forklift hydraulic system determines its service performance and service life. Keeping the hydraulic oil clean is a necessary prerequisite for the safe and smooth loading operation of the forklift. In the process of use, if the hydraulic oil is polluted, it will cause the hydraulic control valve to wear and close loosely, cause the internal leakage of the hydraulic system, or even jam, thus affecting the normal operation of the forklift. To keep the hydraulic oil circuit clean, the hydraulic oil filter element must be replaced regularly and the hydraulic oil must be replaced in time.

Do not think that changing the hydraulic oil is a very simple thing. If the method is improper, it will cause incomplete oil drainage and re pollution. In the past, to replace the hydraulic oil, only drain the oil in the hydraulic oil tank and then add clean hydraulic oil. Since the oil in each cylinder of the forklift has not been replaced, the replaced oil is still unclean. In order to ensure complete oil replacement, a simple and easy method is introduced below.

1. Park the forklift as required before draining the oil

Park the forklift to be replaced on a spacious and flat ground with the direction in the middle. First press the boom cylinder to the limit position, and then press the jib cylinder to the limit position to suspend the front wheel of the forklift, then pad the wheels with end wood, and then shut down the engine. In this way, the oil in the lower chamber (rodless chamber) of the forklift boom cylinder and the rear chamber (rodless chamber) of the jib cylinder will be completely drained.

2. Implement oil change in oil tank

Drain all the oil in the hydraulic oil tank, clean the oil tank, replace the hydraulic oil filter element, and then add clean hydraulic oil to the oil tank to the specified oil level.

3. Implement oil change outside the oil tank

First, disassemble and remove the root of the large oil return pipe (connected with the large oil tank) from the top of the distribution valve, connect it with a rubber hose with the same diameter and introduce it into the container; Start the engine, take away the lower end wood of the tire, and the boom and jib oil cylinders begin to return. The sequence is to retract the jib first, then extend the jib to the limit position, and then retract the jib to the limit position; In this way, the oil in the upper chamber (rod chamber) of the forklift boom cylinder and the front chamber (rod chamber) of the jib cylinder will be completely drained. Then remove the drainage hose, install the hydraulic pipe of the original vehicle, and then reset the boom and jib oil cylinders to the parking condition.

4. Implement the oil change of steering cylinder

Finally, replace the steering cylinder oil. Keep the bucket 30 ~ 40cm above the ground; Remove the left oil return pipe and lead it into the recovery container, turn the direction to the left, drain the dirty oil from the front chamber of the right steering cylinder and the rear chamber of the left steering cylinder, and connect the oil return pipe; Remove the right oil return pipe and lead it into the recovery container, turn the direction to the right, drain the dirty oil from the front chamber of the left steering cylinder and the rear chamber of the right steering cylinder, and connect the oil return pipe; Then go back to the center.

It should be emphasized that during the telescopic action of the hydraulic cylinder, clean hydraulic oil must be added to the hydraulic oil tank at any time to keep it at the specified oil level.

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