Excavators have been playing a key role in construction work of all sizes for a long time. In order to give full play to the high efficiency of the load work and improve the quality of work, we should all give full play to the key use of the excavator in the country’s construction at ordinary times. Therefore, we should all pay attention to early implementation during the operation process. Overhaul and maintenance.
How to do a good job of "service guarantee" for excavators is the responsibility of every driver. In normal times, many drivers still have many misconceptions about some maintenance methods. Today, I will systematically summarize for you, what should be done and what should not be done in excavator maintenance; I look forward to using this article, everyone You can check for deficiencies and add new colors to your future tasks.
Engine oil
As the key factor of diesel engine, oil is used for lubrication, cleaning and refrigeration. In these respects, I want to come to you all to have a deep understanding for a long time. For this reason, there is currently a situation in which many drivers often ensure that the amount of lubricating oil is qualified and gradually ignore the quality of the lubricating grease. It is a very serious problem. But I don’t know that if the quality of the grease is not guaranteed, even if it exceeds the quantitative amount of the grease, its lubricating effect is far from qualified. Even with sufficient grease, the lubricating effect cannot be exerted. In the end, It will cause errors in lubrication and cause serious damage to the machine.
In addition, lubricating grease that suffers from environmental pollution will cause a lot of debris during operation. With the increase of operating time, the debris will flow to the oil along with the operation of the machine. With the accumulation of debris, it will cause tile burning in more serious cases. , Axle holding and other hidden dangers For this reason, when increasing the car oil, the remaining hydraulic oil should be cleaned up and then poured into brand new oil to ensure that the oil is clear from beginning to end.
Cylinder clearance measurement
When detecting the cylinder gap of construction machinery equipment, the orientation of the piston pin hole can not be detected in the vertical bisector of the piston skirt, but in other orientations. The structural characteristics of the aluminum alloy piston are small in the upper part and large in the lower part. It is a cone, and the cross-section of the skirt is elliptical, so the cylinder clearances along the upper part of the circle are not the same. When testing, it is required to take the gap of the elliptical minor axis as the standard, that is, the gap between the piston skirt and the piston pin hole is detected vertically. That detection is more convenient and accurate, and during repeated movement, the orientation of the piston skirt that bisects the piston pin hole vertically is greatly damaged due to the use of side working pressure.
Cylinder liner and piston
In the process of repair and maintenance of construction machinery, when refitting the cylinder liner and piston of the construction machinery equipment, it is deemed that the new cylinder liner and piston are all standard parts, and they are interchangeable and can be operated after installation. In fact, the specifications of cylinder liners and pistons often have certain dimensional tolerances. If a larger size cylinder liner is added to the smallest size piston, the mutual fit gap will be too large, resulting in reduced fatigue and difficult starting. For this reason, when refitting, it is necessary to check the specification sequence number of the standard cylinder liner and piston. The installed cylinder liner and piston must be the same as the specification sequence number of the standard piston and the specification sequence number of the standard cylinder liner. Only then can they guarantee each other. Have a standard clearance for mutual fit.
Plunger stroke capacity
In the inspection of plunger diesel pumps, many construction machinery maintenance workers do not pay attention to checking the stroke capacity of the plunger of the construction machinery equipment. To put it plainly, the stroke capacity of the plunger refers to the amount of movement that the plunger can move up again after the top of the camshaft on the engine camshaft is higher than all dead points. Interruption of fuel supply during adjustment may cause accidents. Just after the beginning of the accident, the stroke capacity is often checked, because the stroke capacity of the plunger is related to the damage of the plunger and sleeve specifications. After the plunger and sleeve specifications are damaged, the plunger needs to be strengthened for a while before the oil supply is interrupted, which may cause an accident, and then interrupt the oil supply, which may cause an accident. delay. When the adjustment anchor bolts are unscrewed or a thicker adjustment protective layer pad or gasket is used, the least part of the plunger is displaced, which reduces the stroke capacity of the plunger. Therefore, when repairing and adjusting the diesel pump of construction machinery, the stroke capacity should be checked first to determine whether the diesel pump is still allowed to be adjusted.
