The occurrence of the problem usually has a lot to do with the routine maintenance. A lot of bad habits will cause the machine to die in the future. For example, the power of the engine drops, the oil path is poor, and the parts are worn out, which may cause the occurrence of the car-back phenomenon. When you encounter the problem of the first carriages do not worry, and secondly to investigate according to the actual situation. Start with engines, hydraulics, circuit systems, and component connections.

Engine problem

In many cases, there is a problem with the diesel pump, which causes the power of the engine to drop. Sometimes, it is easy to start the cold car and the hot car can not start. In this case, the problem of replacing the plunger with the oil nozzle usually can be solved.

Hydraulic pump problem

First of all look at the hydraulic pump control, hydraulic control of the main pressure transferred to the starting point of the variable, and then let the car overflow, if the car, the problem certainly in the engine, but the maximum flow pump should be in standard position, nothing more than two Kind of situation:

1, the hydraulic pump power is too large,

2, the engine power is reduced, the hydraulic pump power is too large, usually caused by invariance or variable delay, P * Q = power, the P limit at the starting point of the variable, regardless of his invariant total power will not exceed the set Power, in this case, but also feed the car, of course, is the engine power is not enough, all the excavator hydraulic system power mainly from the hydraulic pump, hydraulic pump power and engine power does not match the excavator may cause the car , While the excavator hydraulic system power and engine power does not match the causes of what may have the following points:

1) abnormal increase in the temperature of hydraulic oil, resulting in parts of the hydraulic pump brake jams heat.

2) wear and tear regulator aging, serious internal leakage required to adjust the power feedback on the interruption.

3) hydraulic pump sensor failure (positive control system is more obvious), negative control has little effect.

4) The first pressure to the regulator feedback system failure.

5) hydraulic pump internal servo wear, stuck, internal leakage.

Hydraulic pump power adjustment bolts

Of course, the problem of turbocharger engine intake is not enough, it will also cause the car was stalled. Often caused by lack of engine intake due to: air filter plugging caused supercharger is not fully working; supercharger wear; exhaust manifold leakage reduced. Special instructions, such as the need to replace the turbocharger, we must remember that the turbocharger drops a few drops of oil inside to achieve lubrication, while checking the engine body connected to the turbocharger small machine pipe is smooth.

Oil problems

1) diesel quality

Many machine friends are mentioned because of excessive oil impurities, resulting in blocked filters, oil blocked, excessive fuel tank, the engine power decline, and other issues. Usually private gas stations or on-site oil and oil truck oil quality will provide relatively poor, large amount of water, impurities and more, long-term use of such oil will not only damage the machine, often leading to the most troublesome machine rattles, so in Here we suggest that we must choose a regular oil supply channel, you can recommend the use of Sinopec oil, although the price is more expensive, but the quality of oil is guaranteed.

2) Oil Model (Diesel & Oil)

Sometimes there will be winter car feed. Due to the outside temperature is low, choose the wrong type of oil, diesel viscosity will become larger, diesel engine connected to the filter at the engine block will be blocked, and then poor oil supply, eventually leading to the car. Special Note, please choose the appropriate type of diesel in winter according to the actual situation and temperature carefully.

There are also cars in the summer, the problem also appears in the oil model. It is recommended to use 10W - 50W oil in hot season. The problem of oil may be the most easily overlooked.

3) identify the fuel

Must choose genuine high-quality oil, such as the current market, the common oil brands Mobil, bp, Shell, etc., the market fake oil flooding, it is recommended to the regular store to buy, you can also compare the reference price to identify.

4) oil change cycle

Must regularly change the oil, oil deterioration is also one of the causes of the cause of the car was stalled. Everything has a certain shelf life, oil is no exception. Recommended 250-300 hours a replacement, some special models may be slightly longer period, such as Komatsu digging machine about 500 hours to replace. (The above data is for reference only.)

In addition to regular maintenance intervals required to replace the hydraulic oil, the use of crusher, deterioration of deterioration of hydraulic oil to accelerate the replacement cycle should be shortened. After replacing the hydraulic oil or hydraulic components, take care to vent the air.

Filtration problems Machine parts wear, oil impurities and the above-mentioned diesel model problems will cause diesel filter plug, suction pipe filter plug, hand pump filter plug filter and filter plug, so one by one to screen the filter, Filter and oil connections are unobstructed, such as blockage, timely clean-up and replacement. In addition long-term mining operations will produce a lot of dust, so the air filter needs regular inspection and cleaning, outside the filter ash often with compressed air from the inside out, the pressure can not be too large to prevent the filter blow. Internal filtration can not be cleaned. External filter cleaning 2,3 times after the same time with the new filter replacement.

Special Note on the filter paper filter must buy the factory, because the factory filter paper fine, large amount of impurities interception, it is easier to plug than the replacement filter replacement cycle is short, so not long-term non-blocking filter is a good filter.

Fuel system problems Due to prolonged use of low-quality oil caused by a large number of impurities at the bottom of the tank, so the need to clean up the tank regularly, to clear the oil pipeline and oil connections.

In addition, the oil-water separator is also a place easily overlooked, to regularly check the water separator oil and water separation is normal, the other need to regularly open the drain valve at the bottom of the water, to avoid excessive water storage caused by the excavator die-off.

Aging parts wear and tear in some areas is also a lot of friends looking for the most easily overlooked car, such as parts wear and tear aging. Many machine friends will first consider whether the engine and diesel pump power requirements are met, when you find these are no problem, please stop by the way to check whether the engine cylinder piston wear, the engine and other parts of the hydraulic system leaks Damage may be, if an exception must be promptly repaired.

Master to share the case of car-back

1) Komatsu machine problems Diesel piping failure caused by the car, the phenomenon is the same, nothing more than the speed drop, black smoke and the like, but the hydraulic system problems caused by the car, different brands of excavator will hold the car There are different factors, such as Komatsu valve solenoid valve stuck inside the blockage, the filter will cause clogging plugging, PC valve adjustment problems also easily lead to the car. Komatsu solenoid valve causes the refrigerator to clean the internal parts of the solenoid valve, the general can solve the problem, if the PC valve is not properly adjusted, it would have to fine-tune.

2) Caterpillar broom oil-water separator leaking oil leakage problems, and later accidentally discovered the top of the oil-water separator deformation, so spent 200 yuan ocean, converted into a diesel filter, the problem solved. We all know that the top of the separator is made of aluminum, after a long period of high temperature will be deformed, there leaking oil leakage. This is one of the most easily overlooked problems with the most common type of machine.

3) Hitachi Hiss Hitachi EFI machine is generally caused by the battery. For example, the Hitachi machine on the plateau may be a problem of EGR, unplugging the EGR plug, and there is a problem with the pressure limiter of the high-pressure common rail, which may result in the problem of getting into the car. If accompanied by a hot car is not good start, it is necessary to consider the nozzle problem, there may be a common rail and high pressure problems. Komatsu car EFI car car is sometimes epc solenoid valve die or blocked, look just fine. Yanmar's engine choke the car, usually the pump head die.

4) Second-hand phone die-car converted 2010 winter buy second-hand Yuchai 35-7. At that time when the test, difficult to start (with starter fluid), start working after high temperature (boil), the car was serious. Cheap buy back to decisively replace the entire Chai 490 engine, and then change the machine feet, connect some refit, replace the tank, all make a good test, a little better car, the new engine also hold, only disassemble the hydraulic pump, replace the tile and Copper sleeve, other accessories can also be installed test machine, car repair success. The whole do it yourself, after two years without major overhaul.

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