Thermal hydraulic excavator maintenance and repair parts

Full hydraulic excavator in use to attach importance to the engine radiator and hydraulic oil cooler and heat-related parts of the inspection and maintenance, otherwise the heat will lower the engine efficiency, so that oil and water temperature drop caused by power , wear and tear aggravated serious damage can lead to early engine accidents, so can not ignore the parts of these inspection and maintenance.
Thermal hydraulic excavator engines are used in Suction-type air-cooled, suction-type wind allows the air through the radiator core subsamples good distribution. To ensure the use of hydraulic excavators in the engine cooling effect of the original, it is necessary to ensure that the relevant documents with the heat well. The impact of thermal effects has the following aspects:

1, to prevent the use of heat in the process of returning

Around the radiator filler cooked referred to as the "sponge." But it is not any "sponge" can be replaced. In the hydraulic excavator on what is required of it are, we must decay resistance, temperature resistance and better aeration worse, because its main function is to prevent hot air reflow. That is, to prevent the former from the radiator inhalation after the cold temperatures at the rear to enter the radiator (engine cabin), the former should not return to the radiator. If you have some high-temperature gas back into the radiator before the inevitable need to reduce system heat dissipation effect, which led to oil, water temperature, so the engine can not function properly, resulting in early damage. Therefore, the use of hydraulic excavators in the process must not negligence on the radiator around the "sponge" of the inspection and repair of the damaged part to timely replacement.

2, it is necessary to ensure that hot air emissions patency

① radiator part of the cabin after the engines of the partition can not be the demolition of abandoned, otherwise the heat would in the course of the formation of vortex flow, the impact of heat emptying. ② engine part of the cabin ventilation holes must remain open, especially the lower part of engine and pump the exhaust shield may not have to plug the hole and placed articles phenomenon, otherwise the heat will delay the emptying. Into the air volume to reduce the cabin temperature at the same time also increased intake air temperature, electrical components due to temperature is too high and damage arising from early aging.

3, to ensure that part of the cooling air circulation area

Radiator core area of the Department of ventilation, the use of hydraulic excavators in the course because of air flow and a variety of reasons have to plug easily. Protective net has to be timely object remove plug, no protective net of the change according to environmental conditions and construction of the external heat sink of pollution, in a timely manner to carry out clean-up and cleaning, otherwise the air flow channel to reduce the ventilation plug size, you must give a lower cooling efficiency. Internal radiator to prevent the pollution is more important, in use must be strictly in accordance with the provisions of random technical documents, regular replacement of antifreeze and cleaning, can not have contaminated water add to replace the antifreeze. If the internal liquid flow caused by the plug, first, it is difficult to check, and the other is very difficult to clean and clear, only the replacement of the radiator.

4, to ensure that part of the cooling air flow into

Apart from the impact into the air flow and ventilation to prevent the hot air return area, the most important is that wind hood and fan. Introduction wind shield is mainly Veturi has style, ring, box-type three. Fan and guide the installation of the wind shield position has strict requirements, and the distance between the fan and the engine also has requested. Introduction cover because the wind is usually used to improve the fan efficiency, the air in the radiator core subsamples on a more even distribution, and to prevent the heat engine inside the cabin to return. Recommend installed by Cummins Engine requirements: ① core radiator fan from a distance of 50.8 ~ 101.6mm. ② the largest line of fan tip speed limit in the 4000 ~ 5200 meters / min range. ③ fan tip and wind cover the gap between the hole for the fan diameter of 1.5 percent, the smaller the higher the efficiency, when the gap is greater than 2.5% when the air volume for fans to drop so abruptly. Therefore, in the use of maintenance, repair process can not be changed wind shield and fan the size and geometry, but also immutable radiator and fan installation location, otherwise, we can not guarantee that the original thermal effect and can be * sexual. In particular the fans, the majority of non-metallic materials are used to do the pieces of the system, contact high temperature will be deformed, if the deformation will reduce the fan for air flow.

5, to ensure intake resistance and intake air temperature in the standard range (6BT5.9 Cummins engine intake resistance standards ≤ 15inH0o, intake air temperature above 38 ℃ in 6 ℃ for each additional 1 percent drop in engine power, heat dissipation increase of 1.5%)