Oil change steps and precautions of hydraulic syst

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Oil change steps and precautions of excavator hydraulic system

hydraulic excavators generally need to change the hydraulic oil after running zoooh, otherwise it will pollute the system and cause hydraulic system failure. According to statistics 1, about 90% of the faults of the hydraulic system are caused by system pollution. This paper introduces the process steps and precautions of oil change of excavator

1. Preparatory work

(L) be familiar with the working principle, operating procedures, maintenance and use requirements of the hydraulic system, be aware of it, and don't act blindly

(2) according to the oil standard specified in the manual by 2030. 5. The dynamometer main bearing is not allowed to be filled with new oil, and the new oil should be precipitated for 48h before use

(3) prepare tools for disassembling pipe joints, oil filters for filling new oil, filter elements of hydraulic system, etc

(4) prepare cleaning fluid, brush and silk cloth for wiping

(5) prepare the oil drum containing waste oil

(6) choose a flat and solid site to ensure that the machine can rotate without obstacles under the working condition of full outreach of bucket and stick arm. After the boom is fully lifted, it will not touch any obstacles, and the distance from the wire should be more than 2m

(7) prepare 4 sleepers so that they can block the tracks in front and behind.

(8) at least 4 operators are required, including one driver, one on-site commander and two oil changers

2. oil change method and steps

(L) place the boom parallel to the track direction, and turn it to the left 45 ° position. It mainly stops after being placed by the frame, so that the bucket cylinder piston rod is fully extended, and the bucket cylinder piston rod is fully retracted. Slowly lower the boom, so that the bucket is placed on the ground, and then shut down the engine, open the oil tank vent valve, pull each operating handle back and forth, and step on the pedal several times to release the system residual pressure caused by self weight

(2) thoroughly clean all pipe joints, pump and motor joints, oil drain plugs, top oil filler cap and bottom oil drain plug of oil tank and their surroundings with gasoline

(3) open the oil drain valve and the oil drain plug at the bottom of the oil tank to make all the old oil flow into the oil bucket containing waste oil

(4) open the filler cap of the oil tank, take out the filler element, and check whether the residual oil at the bottom of the oil tank and its edges and corners contain metal powder or other impurities. Clean the oil tank thoroughly. First, clean it twice with diesel oil, and then dry the inside of the oil tank with compressed air. Check whether there are residual sludge, impurities, etc. at the internal corners until they are cleaned, and finally rinse with new oil

(5) remove the following oil pipes:

① remove the oil pipes in the oil return circuit, such as the oil pipes from the main control valve to the full flow filter of Shandong Institute of medical devices and the oil return filter, and the oil pipes from the filter to the oil tank and oil cooler

② remove the oil return pipe from the swing control valve to the filter and the oil makeup pipe of the swing motor

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