In the whole construction project, the prevention work of multifunctional excavator mixer truck is not only the damage of structural accessories, but also the state of hydraulic oil circuit. In view of the black oil phenomenon in the construction project, we summarize the following measures according to the actual operation experience:

及时更换防尘封，禁止经常出现偏打情况。

Replace the dust seal in time, and it is forbidden to hit the dust seal with deviation frequently.

致使液压系统发生黑油情况，不仅由粉尘引起，或许因加注黄油不规范所导致。在加注黄油时，应将轮式挖掘机提起，钢钎压到活塞中，每次加注时只需加注标准黄油枪的半枪范围内即可。若在加注黄油时，未压紧钢钎，所加注的黄油会在钢钎槽上限位，在钢钎工作时，黄油会直接蹿到主油封位置，随着活塞往复运动将黄油带到中缸体内，再随着中缸内的液压油混入轮式挖掘机液压系统内，从而致使液压油发生变质、发黑等异常情况。

Black oil in the hydraulic system may be caused not only by dust, but also by irregular filling of butter. When filling grease, the wheel excavator shall be lifted and the steel drill shall be pressed into the piston. Each filling only needs to be filled within half the range of the standard grease gun. If the steel rod is not pressed tightly when filling the grease, the filled grease will be at the upper limit of the steel rod groove. When the steel rod is working, the grease will jump directly to the main oil seal position, bring the grease to the middle cylinder with the reciprocating movement of the piston, and then mix the hydraulic oil in the middle cylinder into the hydraulic pressure system of the wheel excavator, resulting in abnormal conditions such as deterioration and blackening of the hydraulic oil.

加装回油过滤器装置，将外界灰尘。在更换油管、钢管、回油滤芯等液压附件时，需将接口位置的粉尘，或杂物清理干净后才能松开更换。

Install oil return filter device to remove external dust. When replacing hydraulic accessories such as oil pipe, steel pipe and oil return filter element, it is necessary to clean the dust or sundries at the interface before loosening and replacing.

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