What causes the high oil temperature in the lift truck hydraulic system?

The hydraulic system is usually installed on the truck crane. The lifting weights are achieved by the lifting of the hydraulic system. Therefore, the hydraulic system is very important for the normal operation of the truck crane. If the hydraulic system oil temperature is too high, it will be As a result, the working efficiency of the hydraulic system is reduced, the leakage is increased, and even the crane cannot work normally. So what are the reasons that cause the temperature to be too high?

1, improper selection of oil

The choice of hydraulic oil is very important. If the quality and viscosity grade of the oil product do not meet the requirements or the hydraulic oil of different brands is mixed, the hydraulic oil viscosity will be too high or too low. If the oil viscosity is too high, the power loss increases and the oil temperature rises; if the viscosity is too low, the leakage increases and the oil temperature rises.

2, serious pollution

The construction site of the truck crane is in a harsh environment. As the working time increases, impurities and dirt are easily mixed in the oil. The contaminated hydraulic oil enters the gap between the pump, motor, and valve and can scratch and damage the accuracy of the mating surface. And roughness, increase leakage and increase oil temperature.

3, filter plug

Abrasive particles, impurities, and dust are absorbed by the filter element of the oil filter when it passes through the oil filter, resulting in increased oil absorption resistance and energy consumption, causing the oil temperature to rise.

4, mixed with air in the hydraulic system

The air mixed with hydraulic oil will escape from the oil and form bubbles in the low pressure area. When it moves to the high pressure area, these bubbles will be broken by the high pressure oil and be subjected to rapid compression and release a lot of heat, causing the oil temperature. Increased.

5, the hydraulic oil tank is too low

Too little oil in the hydraulic tank will make the hydraulic system not have enough flow to take away the heat it generates, causing the oil temperature to rise.

6, the external environment temperature is too high

Excessively high ambient temperatures and long periods of high-load use will make the oil temperature too high.

7. The hydraulic oil cooling system is not working properly.

Typically, a water-cooled or air-cooled oil cooler is used to forcibly cool the hydraulic system's oil temperature. Water-cooled chillers can reduce the heat-dissipation coefficient due to dirty fins or poor circulation of water; air-cooled chillers can block fins of chillers due to excessive oil contamination, making it difficult for fans to dissipate heat. Causes the oil temperature to rise.

8, parts wear serious

The gear pump's gear and pump body and side plate, piston pump and motor's cylinder body and distribution plate, cylinder bore and plunger, reversing valve's stem and valve body are all sealed by gap, these components Wear will cause increased internal leakage and increased oil temperature.