Excavator distribution valves are the main construction machinery in earth and stone works. Excavator distribution valves are widely used in construction, road construction, water conservancy, open-pit mining and national defense projects. If the distribution valve of the excavator is not maintained in time, various failures may occur. Below, Xianji.com has compiled knowledge about maintenance of distribution valves for excavators and shared them with you.
The working principle of the distribution valve
The engine flywheel is connected to the elastic plate of the torque converter in rotation. The elastic plate is connected to the cover wheel, which is connected to the transfer gear of the pump wheel. The rotation of the transfer gear drives the working pump shaft gear to rotate, and the hydraulic working pump starts to work.
How to repair the distribution valve of the excavator that cannot be started or is difficult to start?
Main points of electrical system fault maintenance
If the battery is insufficient, charge the battery in time, check the liquid level of the battery, and replenish the electrolyte to the specified height in time. If it is found that the battery is aging and poorly charged, the battery should be replaced. At the same time, pay attention to the daily maintenance of the battery, and do not leave the battery in a state of constant power loss.
Starter failure Repair or replace the starter.
Generator failure Repair or replace the generator.
Line failure Check the line and repair it.
Main points for maintenance of engine oil circuit failure
Low pressure oil circuit gas resistance: under the suction action of the fuel transfer pump or fuel injection pump, fuel is sent from the fuel tank to the high pressure pump via the low pressure oil circuit. If the low-pressure oil circuit is not tightly closed, or the oil level in the fuel tank is too low, and the vehicle is parked and driven at an angle, air will take the opportunity to enter the oil circuit; if the temperature is high, the fuel evaporates, it will also form air resistance in the low-pressure oil circuit, causing the engine to work Unstable, automatic flameout or engine can not start.
Oil circuit blockage: The common parts of oil circuit blockage mainly include the suction pipe, filter screen, diesel filter, fuel tank cap vent, etc. in the fuel tank. The main problem that causes oil circuit blockage is the injection of diesel that does not meet the standard, or the mixing of impurities during the refueling process. The key to prevention is to ensure that the diesel is clean and the oil circuit is sealed, to carry out regular maintenance of the oil circuit, to strengthen the cleaning and maintenance of the diesel filter, to clean or replace the filter element in time, to clean the fuel tank in time according to the operating environmental conditions, and to completely remove the bottom of the fuel tank. Sludge and moisture.
The failure of the fuel injection pump: The plunger of the fuel injection pump and the fuel delivery valve are severely worn, which makes the engine start difficult. At this time, the plunger and delivery valve should be replaced in time.
How to repair the excavator's distribution valve weak?
The engine has sufficient power and operates normally, but the operating speed of the distribution valve of the excavator is slow and the excavation is weak.
The hydraulic pump of the distribution valve of the excavator is mostly a variable plunger pump. After a certain period of operation, the internal parts of the pump will inevitably wear out, causing internal leakage, and the data of various parameters are not coordinated, resulting in insufficient flow, excessive oil temperature, and slow speed. Can't build high pressure, so the action is slow and weak. For this type of problem, you must remove the hydraulic pump for data measurement, confirm the problem, replace the accessories that can not be used, or repair the accessories that can be used, and then reassemble and debug on the calibration platform to match the parameters of each circuit (pressure, flow, Power and variables, etc.).
An important hydraulic component on the distribution valve of an excavator is a multi-way distribution valve, which has a main safety valve, a secondary valve, an overflow valve, and a supplement valve. If the pressure set by these valves does not reach the standard pressure.
The above is the analysis and maintenance points of the failure cause of the excavator's distribution valve can not be started, difficult to start, and weak. When the hydraulic system of the excavator fails, check around the hydraulic pump, distribution valve, and cylinder. The specific judgment of where the failure occurred depends on the actual situation. Check the small part first. Generally, check the safety valve on the distribution valve first. This safety valve often gets stuck. When overhauling the distribution valve, you must pay attention to safety and the boom must be flat on the ground.
