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Prevention and maintenance technology of hydraulic system overheating of Carter excavator

Visits:Date:2017/4/14 16:52:46

Maintenance Description:

Indicating that the viscosity of the oil changes with the temperature changes to a lesser extent; the other hand, the larger. Foreign manufacturers (such as Mobil, Shell, etc.) anti-wear hydraulic oil viscosity index are VI ≥ 110, Carter excavator hydraulic system overheating prevention and maintenance technology Domestic advanced anti-wear hydraulic oil viscosity index VI = 95 or so. While the foreign production of high viscosity index hydraulic oil (HV) and multi-stage engine oil viscosity index are VI> 140; domestic lamp oil is less than the level. This point for the use of large-scale imported hydraulic excavator and the use of domestic hydraulic oil (or engine oil for hydraulic oil) users have to pay special attention. Reduce the viscosity index will reduce the environmental temperature range of the oil, if not use can not, should be related to the oil manufacturers to check the relevant information, the need to make appropriate adjustments to the use of oil, if necessary, should also change the equipment set value ( Such as limit temperature, etc.).

1, the rational use of hydraulic oil

(1) hydraulic oil viscosity (ISO VG, viscosity unit mm2 / s)

The principle of determining the viscosity of the hydraulic oil is that the hydraulic oil viscosity (16-36x10- 6mm2 / s) of the hydraulic oil (for components such as pumps and motors) is considered to be the lowest in the environment, taking into account the operating temperature and efficiency of the hydraulic circuit Temperature corresponding to a short time cold start viscosity ≤ 1000X10-6mm2 / s; and corresponding to a short time allowed maximum leakage oil temperature 90 ℃ viscosity ≥ 10X10-6mm2 / s.

Prevention and Maintenance of Overheating of Hydraulic System of Carter Excavator

At present, the domestic use of large-scale hydraulic excavators are mostly well-known manufacturers of foreign products, these manufacturers to provide users with the instructions in detail the hydraulic system and other oil viscosity grade, quality level, suitable for ambient temperature range, and even production Manufacturers, etc., therefore, the user should seriously study and master these relevant content, otherwise, it is likely to cause adverse consequences.

For example, Germany and a domestic factory co-production of long excavation 982 excavator, put into use the first summer to meet the continuous high temperature of 40 ℃, the hydraulic system for about 1h oil temperature is more than 100 ℃, not only serious Affecting the progress of the work, but also caused damage to the system components. The reason for the prevention and maintenance of the overheating of the hydraulic system of the Carter excavator is that the equipment manager neglects the instructions provided to the users of the summer system and does not specify the verification of the oil used in the summer system, and the manufacturer's instructions to the user Did not specify the requirements for the summer high temperature system oil (only marked at room temperature with oil viscosity grade). When the VG100 hydraulic oil used, the problem was immediately resolved.

(2) Viscosity index (VI)

The index reflects the viscosity of the oil with the temperature changes in the nature of the change (that is, the viscosity of the oil characteristics), the oil viscosity index is high,

       (3) other comprehensive performance

Because of the high working pressure (≥32MPa) of the hydraulic system of modern large hydraulic excavator, the maximum working oil temperature of hydraulic oil is also high (about 90 ℃), the prevention and maintenance of overheating of the hydraulic system of Carter excavator is Normal oil change cycle of the hydraulic system can work properly, it is required for the system selected oil lubricity, oxidation stability, abrasion resistance, rust and corrosion resistance, anti-emulsification, anti-foam, shear stability and Extreme pressure load and so has a good quality. These comprehensive properties of oil can be compromised by international quality standards that are met by various oils. For example, the quality standards for diesel engine oil are: API-CF-4, CF, CE, CCMC-D4, D5; SHPD-S3, Carter excavator hydraulic system overheating prevention and maintenance technology MIL-L-2104E and so on. Especially when the choice of alternative oil, be sure to pay attention to meet the requirements of the standard oil. Otherwise, in the process of equipment may be due to substandard quality of the system and the system overheating, damage to components and other serious problems In contrast to the general overhaul technology, only the old engine failure parts dismantling, the hidden quality problems can not be excluded; Equipment cleaning, testing, can not guarantee the cleanliness requirements, only the replacement of wear parts and fault pieces, can not eliminate the implied quality failure; parts processing equipment is simple, can not guarantee the parts size accuracy and position accuracy

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