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 work load and improve the quality of work, all of us should 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. 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 areas, I want to come here 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 played. 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, and the accumulation of debris will cause tile burning in more serious cases. , Axle hazard and other hidden accidents. For this reason, when increasing 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 is that it is small in the top and large in the bottom. It is a cone, and the cross-section of the skirt is elliptical, so the cylinder gaps along the upper part of the circle are not the same. When testing, it is required to take the gap of the oval 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 by the side working pressure.
Cylinder liner and piston
During the repair and maintenance of construction machinery, when refitting the cylinder liners and pistons of construction machinery equipment, it is assumed that the new cylinder liners and pistons 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 clearance 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, and the installed cylinder liner and piston must make the specification sequence number of the standard piston and the specification sequence number of the standard cylinder liner the same. 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 start time, 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 has 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 the accident. delay. When the adjustment anchor bolts are unscrewed or the thicker adjustment protective layer pads or gaskets are 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 still allows adjustment.
