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Cause of severe wear and improvement measures of hydraulic gear pump in China
release time:
2022-12-08 11:03
source:
The severe wear of the hydraulic pump of the excavator has a fatal effect on the excavator, so such problems must be solved in time. When repairing the hydraulic pump of the excavator, find out the fault cause from the following three points:
(1) Check the internal leakage situation of the boom oil cylinder
The easy way is to raise the boom to see if it is obvious free drops. If the fall is obvious, remove the cylinder and replace the seal ring if worn.
(2) Check the control valve
First clean the safety valve, check if the valve spool if there is still no change, and then check the wear of the control valve spool, the clearance limit is generally 0.06MM, serious wear should be replaced.
(3) Measure the pressure of the hydraulic pump
If the pressure is low, adjust it, the pressure is still not adjusted, it means that the hydraulic pump is seriously worn.1. Generally, the main reasons why the boom band load cannot be lifted are:
1. Excavator hydraulic pump is severely worn
In low speed operation, the pump leakage is serious; at high speed operation, the pump pressure is slightly increased, but due to the wear and leakage of the gear oil pump, the volume efficiency is significantly decreased, and it is difficult to reach the rated pressure. The hydraulic pump working for the long time intensifies the wear and the oil temperature increases, which causes the wear of hydraulic components and the aging and damage of seals, the loss of sealing capacity, and the deterioration of hydraulic oil, leading to the failure.
2. Unreasonable selection of hydraulic components
The boom cylinder specification is 70 / 40 non-standard series, the seal is also non-standard parts, high manufacturing cost and the seal replacement inconvenience. The small cylinder diameter of the boom cylinder is bound to make the system setting pressure high.
3. The hydraulic system design is unreasonable
The control valve is connected in series with the full hydraulic steering device for a single pump, and the set pressure of the safety valve is 16 MPA, and the rated working pressure of the hydraulic pump is also 16 MPA. The hydraulic pump often works under full load or long time overload (high pressure), and the system has hydraulic impact, does not change the oil for a long time, the hydraulic oil pollution, aggravate the hydraulic pump wear, so that the hydraulic pump pump shell burst (such fault was found later).
2. Improvement and effect
(1) Improve the hydraulic system design
After many arguments, the advanced priority valve and load sensing full hydraulic steering device form. New system can be in accordance with the steering requirements, priority to the distribution flow, regardless of the load size, steering wheel speed can guarantee oil supply, the rest can all supply working device circuit use, thus eliminate the steering circuit oil supply and power loss, improve the efficiency of the system, reduce the working pressure of hydraulic pump. Reduce the severe wear of the excavator hydraulic pump.
(2) Optimize the design of the boom cylinder and hydraulic gear pump modeling
Reduce the system operating pressure. Through the optimization calculation, the boom cylinder adopts the standard series 80 / 4. The displacement of the hydraulic pump is increased from 10ML / R to 14ML / R, and the system adjustment pressure is 14 MPA, which meets the lifting force and speed requirements of the boom cylinder.
(3) Strengthen the daily inspection and maintenance
In the process of use, attention should also be paid to the correct use and maintenance of the loader, to add or replace the hydraulic oil regularly, to maintain the cleanliness of the hydraulic oil, and strengthen the daily inspection and maintenance. In this way to avoid the excavator hydraulic pump severe wear.
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