08What is the reason for the pressure drop of the hydraulic system of the mini excavator

08What is the reason for the pressure drop of the hydraulic system of the mini excavator

2020-12-08 10:49:42   source:chinaminiexcavator.com  edit:xiaoli

Do you know the pressure drop phenomenon of the hydraulic system of a mini excavator? Today we will introduce.

08What is the reason for the pressure drop of the hydraulic system of the mini excavator

The normal working pressure of the variable torque transmission system is between 1.0-1.6 MPa. When the pressure drops below 1.0 MPa, the loader will become weak and difficult to walk. The main reasons for the failure are as follows:

(1) 08 mini excavator torque converter hydraulic transmission oil is not filled as instructed. Repair the excavator and add unqualified hydraulic transmission oil randomly.

(2) The filter element fixed on the gearbox is dirty, the filter element is blocked due to maintenance of the excavator, and the supply pressure is insufficient.

(3) The iron particles produced by abnormal wear of the thrust bearing and thrust ring of the hydraulic torque converter of the excavator caused the distribution valve in the valve assembly to be stuck, resulting in internal oil return.

(4) The valve stem of the distribution valve of the excavator valve assembly is worn out, causing internal pressure to be released.

(5) The iron-end particles produced by the abnormal wear of the ball bearings and thrust bearings of the excavator gear set caused the distribution valve and the internal oil return to be blocked.

(6) Abnormal wear of the needle roller bearing of the 08 mini excavator pump assembly caused a slight longitudinal displacement of the driven gear, and the oil supply changed during operation.

(The pump body and pump cover in the pump assembly of the 708 mini excavator are in contact with the main and driven gears of the excavator, and the internal cavity oil is released.

When troubleshooting such failures, the following points should be noted:

(1) Replace the qualified hydraulic transmission oil according to the instructions and replace it in time.

(2) Maintain or replace the filter element installed on the gearbox housing as planned.

(3) The torque converter should be disassembled regularly, and the thrust bearing and thrust ring should be replaced in time.

(4) The stem of the valve assembly can be treated by spraying technology. The disadvantage is that the service life is very short and the valve assembly can be replaced.

(5) The needle bearings and thrust bearings of the gear set should be disassembled regularly. It is recommended to replace the bearing in less than one overhaul period.

Suggestions for the current 08 mini excavator industry and product development

1. Strengthen industry management and supervision

The machinery management department should assume the supervision function of the 08 mini excavator industry, and can strengthen the confrontation through supervision and spot checks.

2. Develop and standardize the standards of small agricultural excavators

According to the actual production situation of my country's 08 mini excavator, on the basis of existing national, industry and enterprise standards, formulate and standardize the 08 mini excavator standard, formulate product model rules uniformly, and ensure that the production of such products obeys the standards and comprehensive restrictions . Improve the production standardization of my country's 08 mini excavators, especially the mandatory safety standards, so as to improve product quality and safety, and promote the stable and sustainable development of the industry.

08 The pressure drop phenomenon analysis of the hydraulic system of the mini excavator and the industry development suggestions are like this, I hope it will help you.


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