(1) The oil change procedure for the oil tank, hydraulic plunger pump, boom cylinder, stick cylinder, bucket cylinder, swing motor, and left and right travel motors cannot be changed. Different projects can only manipulate the corresponding parts to make them move, avoiding operational errors if they occur.
(2) Quality requirements for hydraulic oil:
The service life of excavators is directly related to the quality of hydraulic oil. It is necessary to choose hydraulic oil that meets the quality standards certified by the American Society of Engineers. This type of hydraulic oil has a stable viscosity index at 40°~100°C. When replacing, it is necessary to use the same brand of hydraulic oil.
(3) Requirements for hydraulic oil viscosity:
There are three types of anti-wear hydraulic oil, including N32HL, N46HL, and N68HL. The excavator with a service life of 1,000 hours should use N46HLN68HL anti-wear hydraulic oil (each accounting for 50%). N68HL anti-wear hydraulic oil is recommended for excavators that have been in use for more than 15,000 hours.
(4) Service life of hydraulic oil:
The service life of hydraulic oil is 4000-6000 hours, which is about two years. In spring and autumn, there is a large temperature difference between day and night. After the excavator has worked all day, it stops working at night. The oil inside the hydraulic oil tank is at high temperature, while the air outside the tank is at low temperature. When the hot air inside the tank meets the cold air outside the tank, condensation occurs at the top of the tank, forming water droplets that fall into the hydraulic oil. Over time, water will be mixed into the hydraulic oil. Then it turns into acidic substances that corrode the metal surface. Under the dual effects of mechanical operation and pipeline pressure impact, metal particles shed from the metal surface will be mixed in the hydraulic oil, with large metal particles filtered out and smaller than 10μm particles retained? The hydraulic filter element with a particle size of 100-200 microns cannot filter out the particles, and the unfiltered particles mixed in the hydraulic oil will aggravate the re-wear of the metal surface.
(5) Selection of hydraulic oil filter:
The required filtration accuracy is 10μm? m50%, pressure range of 1.4-3.5MPa, rated flow rate of 40-400L/min, recommended replacement time of 500h.
(6) All the oil pipes that have been disassembled must be replaced with seals. When connecting (O-ring), apply thread sealant on the thread surface to prevent leakage.