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Precautions After Replacing the Hydraulic Pump on an Excavator

(1) Always watch for abnormal phenomena. Abnormal noise, vibration, or abnormal signals from the monitoring system must have a cause. As soon as an abnormality is found, immediately obtain the circuit diagram and follow it to trace the cause.

2013-07-09
An Energy-Saving and Emission-Reducing High-Quality Pile Type: Introduction to XCC Pile Technology

The cast-in-place X-shaped concrete pile (XCC pile for short) is a large-diameter pile with independent intellectual property rights, independently developed by the research team led by Professor Liu Hanlong, Dean of the College of Civil and Transportation Engineering at Hohai University and a Changjiang Scholar.

2013-07-09
A Brief Discussion on the Degree of Saturation of Soil

According to the "Standard for Basic Terms of Geotechnical Engineering" (GB/T50279-98), the degree of saturation is defined as the ratio of the volume of pore water to the volume of pores in soil, expressing the extent to which water fills the voids; it can be calculated from the soil density, specific gravity of soil particles, and water content of the soil.

2013-07-09
Troubleshooting of Caterpillar 320B Excavator Engine Stalling under Load

The common problem of excessive load (engine stalling, lugging) in Caterpillar 320B models typically manifests as a drop of more than 200 rpm under normal working conditions. First, it must be clear

2013-07-08
Diagnosis of Slow Excavator Operation

A Daewoo DH220-III excavator suddenly exhibited slow front-end movements after 4,600 hours of operation. Analysis suggests the fault may lie in three areas: main relief pressure being too low; pilot pressure being too low.

2013-07-08
Research on the Patterns of Hydraulic Oil Contamination and Its Prevention and Control

1. Definition and standards of hydraulic oil contamination level. The hydraulic oil contamination level refers to the degree to which hydraulic oil is contaminated. The standard for determining the hydraulic oil contamination level includes ISO 4406, formulated by the International Organization for Standardization.

2013-07-08
Precautions After Installing a New Hydraulic Pump

(1) Pay attention to the operating condition within the first three months of new machine operation. During this period, conduct operational checks, such as component maintenance, whether screws are loose, whether oil temperature rises abnormally.

2013-07-08
A Brief Discussion on the Maintenance of Hydraulic Systems in Commonly Used Construction Machinery

For mechanized construction enterprises, whether the technical condition of construction machinery is good or not is a direct factor determining whether the enterprise can produce normally. For construction machinery with hydraulic transmission, the normal operation of the hydraulic system

2013-07-08
Analysis of Slippage in Mud Layers during Rotary Drilling

1. Bottom closure: When using a friction bar rotary drilling rig to drill into the mud layer of a water pile, pay attention to the drilling depth per bucket. If the single-bucket drilling depth is too deep, the drilling bucket is already full of soil. The soil cut by continued drilling has nowhere to accommodate and accumulates at the slag inlet of the drilling bucket and in front of the bucket teeth. When the accumulated soil reaches a certain amount, a large block of soil forms in front of the bucket teeth, equal in height to the bucket teeth and integrated with them. At this time, the bucket teeth have lost their cutting function. Under the lubrication of mud or water, the drilling bucket cannot continue drilling. Therefore, when reversing to close the bucket bottom, there is no resistance at the bucket bottom, so the bucket bottom will rotate together with the drilling bucket and cannot be closed.

2013-07-08
Review of Foundation Settlement Problems and Reflections on Solutions

Foundation settlement is a verification criterion in foundation design, particularly important for construction projects, high-grade highways, railways, airports, and other engineering works, sometimes even determining their success or failure. Engineering practice shows that most engineering accidents are caused by excessive or uneven foundation deformation. High-speed railways and underground projects require deformation accuracy at the centimeter or even millimeter level. The success of high-speed railways depends on settlement, and these modern projects impose higher requirements on foundation settlement calculation. In recent years, breakthroughs have been made in the study of soil strength and stability, but little progress has been made in foundation deformation research. The calculation results obtained from various settlement calculation theories always differ greatly from measured values, and there is still no satisfactory calculation method for foundation settlement (Chen Xiangfu [1], 2004).

2013-07-08
Application of Titanium Alloy Nano Coatings in the Machinery Industry

1. The machinery and equipment industry has become a leading industry with fruitful results in China and has entered its best development period. The machinery industry is closely related to the growth rate of fixed asset investment. It is expected that during the 11th Five-Year Plan period, China will maintain a relatively high economic growth rate.

2013-07-05
Improvements to the Radiator of Small Excavators

In general, small hydraulic excavators mount the fan on the engine, with the water radiator and oil cooler arranged front-to-back (i.e., in a series structure), as shown in Figure 1. This structure is easy to manufacture but prone to clogging.

2013-07-05

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