Doosan dx215-9c excavator is difficult to start and fuel consumption increases
If I ask the old drivers what problems they are most afraid of before construction? The answer is the same, it must be difficult to start! Because it is difficult to start the machine, most of the time will be wasted in the initial stage, not to mention a smooth construction day
Fault phenomenon:
In fact, the fault phenomenon of this Doosan dx215-9c excavator is relatively simple. It is difficult to start the machine. It needs to be started repeatedly before normal construction. Moreover, the owner also said that the oil consumption of the machine has increased for a period of time
However, when the fuel consumption soared, the owner did not pay much attention to it, thinking that the recent construction happened to be overloaded, so the increase in the fuel consumption of the machine was also within the scope of understanding. The most serious problem was the difficulty in starting!
In this regard, let's take a look at how the maintenance master solved the problems of difficult startup and increased fuel consumption of Doosan dx215-9c excavator!
According to the usual maintenance experience, the increase in fuel consumption and the difficulty in starting are inextricably related. The following are the fault reasons summarized by the engineer. I hope you can check the number of seats when referring to them:
First: if there are impurities on the contact surface of cylinder gasket, cylinder block, cylinder head, etc., such as common stains and dust, a small gap will appear over time, and this gap will become more and more serious, which will lead to failure
Second: some maintenance workers or the owner will apply a layer of butter to the cylinder pad during maintenance. This layer of butter will melt and deposit carbon when the engine is running at high speed and the temperature rises, and the joint surface will be uneven
Third: if the bolts are not tightened according to the specified sequence and torque when installing the cylinder head, the direct result is that the cylinder head is slightly deformed
Fourth: the expansion degree of cylinder head and screw will decrease in different degrees after repeated maintenance
Fifth: there are minor defects on the joint surface of cylinder block and cylinder head, such as pits and scratches, which will produce tiny gaps
Sixth: the cylinder liner does not protrude enough from the plane of the engine body, or the difference between the two adjacent cylinders of the multi cylinder engine is more than 0.3mm, forming a gap
Seventh: the driver's operation methods and habits are different, and a considerable number of pilots often slam the accelerator
Solutions and preventive measures:
1. It is suggested that if you are disassembling, repairing or reassembling by yourself, you should wipe the cylinder gasket, the joint between the cylinder block and the cylinder head, and leave no room for pollutants and impurities
2. The bolts on the cylinder head can not be tightened directly. During operation, everyone must master the installation method, tightening sequence and direction in advance, from the inside to the outside, from the diagonal direction for 3 to 4 times, and tighten evenly according to the specified torque
3. There is a detail that many aircraft friends will ignore. In general, the maintenance workers in the industry will work for 10-15 hours after the maintenance, and then tighten again according to the specified torque, so as to prepare for a rainy day and make secondary insurance
4. Before installation, carefully check whether there are bumps, obvious beads and pits at the plane joints of cylinder head and engine body. If there are, replace or grind the newly purchased cylinder pad. Hang it on the wall in time to avoid overlapping with other items
5. Standardize the driving habits and operating methods of the operator, and correct the habit of slamming the accelerator in time
summary
Many engine faults are not formed overnight, but a process of long-term accumulation until the outbreak. Therefore, I remind all friends to pay special attention to the slightest abnormality of the machine during daily operation or self maintenance. If there is any problem, start to check it immediately! There is no room for fault amplification.
