Why do excavator accessories get hot?

The hydraulic components of excavator fittings must be operated at a reasonable temperature. Too high temperature will lead to increased friction and premature wear, which not only affects the service life of components, but also increases the maintenance cost. This is a trouble for many digging friends.Therefore, to solve the high temperature problem of hydraulic components of excavator accessories has been the direction of efforts of many technicians. Today, Volvo construction machinery accessories Xiaobian will take you to find several major reasons for the heating of components:
I. Friction between the excavator accessories:
1. The friction of the bearing of the oil pump by external force will heat, the friction of the blade and the rotor will heat, and the friction of the blade and the stator will heat. These are the heat source, and the concentration will affect the heat of the oil tank.
2. The motor itself will also get hot due to work, but it can be ignored because it is far from the oil pump.
Two, oil caused friction:
1, in order to make the liquid line in the shortest possible time into the pressure (differential pressure), generally we usually have two ways, one is on the inlet and the size of the oil outlet is a little difference, the oil spout like in the inlet, the second is the oil outlet closed, excavator parts overflow valve to control the flow of export, when the flow of the oil amount is less than the amount of oil into the,The liquid in the oil pump will gather more and more, because the oil is incompressible, the internal pressure will form, when the oil passes through the narrow channel, due to the effect of the pressure, the oil will pass through at the fastest speed, at this point, the faster the flow rate is, the higher the temperature, friction heating once again played a role.

2. In any hydraulic system, the liquid will not be 100% utilized. The pressure and action can not be separated from the closure of the relief valve of the excavator fittings.
Excavator element
3, selection of excavator parts oil pump displacement, in principle, be used, if the choice of large displacement, the extra traffic with speed regulating valve or overflow valve will drain away, and the more the flow with the original flow as it should be packed in a small space, when the normal flow velocity will be faster, friction heat is unavoidably again.
4, both hydraulic pump and hydraulic valve, or oil cylinder, as long as the liquid rapidly from the tolerance clearance in excavator parts components are high pressure extrusion, can produce liquid friction and cause fever, these being squeezed out of the oil should not have run out, because the precision of the hydraulic components with bad or the results of hydraulic components wear aging big clearance.
III. Influence of external factors:
In southern cities, the outdoor and indoor temperature is as high as 38 degrees in summer. Even before the equipment is turned on, the basic temperature of the equipment is high, which is only one section lower than that of northern cities.
Four, reasonable temperature reference
1. When the tank temperature is below 60 degrees, it is a reasonable temperature and does not need to be changed.
2, if the system works for 2 hours, the oil pump temperature (including all hydraulic components) is below 50 degrees, this is the best state, can rest assured that the work, it is estimated that a day will not rise to 50 degrees.
3, if the tank base at 60 degrees, the temperature of oil pump outlet temperature (including high pressure front cover, outlet flange, a rear cover parts of the oil pipeline, double pump) should be around 65 degrees, slightly higher than the fuel tank temperature, if this a few parts (this also includes other hydraulic components) temperature greater than 70 degrees, the temperature of the fuel tank will rise again, it's need to be solved,If the temperature of the tank is constant below 60 degrees after a few hours, this is the normal temperature and no disposal is required.