Analysis of the causes of oil leakage in small excavators costing 20,000 to 80,000 yuan

[BONOVO]

Let's analyze the reasons for the occurrence of 20,000 to 80,000 yuan small excavators.
When the excavator is running, the pipeline vibrates severely and the pipeline often cracks. When the test is confirmed, especially when the Beichuan overflow valve is released, the vibration is aggravated, and the repair of the old excavator is announced. The parts, components and parts removed from the vehicle can be repaired after the repair and replaced by the original vehicle. The main reason for the burst pipe is the vibration of the hydraulic oil. The noise source includes the hydraulic pump, safety valve, piston motor, engine, hydraulic cylinder and pipeline.

If you refuel at a nearby gas station, the domestic fuel injection pump can be used for 1 to 15 years, while the imported fuel injection pump can be used for 2 to 3 years. If dirty oil is used, the injection pump can be stopped immediately.
When the above years are used, if it is found that the diesel engine is difficult to start, the exhaust smoke and power (referring to the amount of work completed per unit time) are reduced, the fuel injection pump needs to be repaired.

This is mainly due to the oil stick stuck or the governor failure. The fuel injection pump must be repaired.

After the diesel engine is started, the idle speed is normal. After adding high speed, the throttle valve is released but the speed does not decrease. This is the idling oil volume at idle and low speed after the plunger wears. Once the fuel is increased, the throttle valve can be released and the structure can return to the idling position. However, due to the fast fuel supply speed, the speed cannot be reduced. At this time, it is necessary to repair the fuel injection pump.

Small excavator, small hook machine

The high-pressure oil pipe does not produce oil, but the low-pressure oil circuit has oil, and the diesel engine cannot start. It is obvious that the fuel supply rod is stuck in the non-fuel supply position. At this time, the fuel injection pump needs to be repaired in time.

The speed is very fast, which is the insensitivity of the fuel rod or the governor cannot work properly. Therefore, the fuel injection pump also needs to be repaired.

When accelerating, the engine speed does not change or changes little. This indicates that the fuel supply rod is stuck in a certain position and the fuel injection pump needs to be repaired.

Improvement and function

(l) Improve the hydraulic system design. After repeated certification, the primary priority valve and load sensing full hydraulic steering method were selected. Regardless of the load size and steering wheel speed, the new system can prioritize the flow according to the steering demand (in cubic meters per second). It ensures sufficient fuel supply and can use some of the remaining power in the circuit, eliminating the loss of successful power supply to the steering circuit, increasing system power and operating pressure. The hydraulic pump is lowered.

The improvement and function of the 20,000 to 80,000 yuan small excavator and the phenomenon of oil leakage are here, I hope it will be helpful to you.

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