You may encounter various faults when driving the excavator. I think the most common is that you can't start the fire. So what are the reasons for the failure of ignition and what are the ways to troubleshoot these faults? I'll explain it in detail today.
Circuit
There are many reasons why the excavator can't catch fire. The most common reason that Xiaobian encountered is the circuit. So how to judge that the circuit causes the ignition failure?
The failure of ignition caused by circuit failure is mainly manifested in no response when turning on the ignition switch or the starting motor speed is too low, which can feel powerless. If these two phenomena do not catch fire, it can be roughly determined that the starting circuit has failed. Then, how to check it?
Check the battery pile head
Check the circuit from the source. First check the battery pile head, clean the battery pile head, and then tighten the screw of the pile head. Xiaobian failed to catch fire several times before because the battery pile head was loose, resulting in poor contact and insufficient voltage. If possible, the owner can measure the battery voltage with the voltage gear of the multimeter.
If the battery has no fault, the next step is to check the line. Check the line along the battery to see if there is a broken line or a loose connector.
Check relay box and fuse box
Next, start to check the starting relay and fuse box, open the relay box to check whether the connector is loose, and then open the fuse box to check whether the fuse of the starting circuit is burnt out.
Of course, the failure of the starting motor or generator can also lead to non ignition. Among them, the failure of the generator will lead to the failure of the generator to generate electricity normally, and the battery power cannot be supplemented, resulting in low speed or non rotation of the starting motor.
Oil circuit
In addition to the cause of the circuit, the oil circuit is also a common cause of non ignition. Then, how to judge that the failure of the oil circuit is the cause of non ignition?
If you can hear the strong rotation of the starting motor when you unscrew the starting key, and there is no abnormal mechanical friction sound of the engine, it can be roughly determined as the cause of the oil circuit. The inspection of the oil circuit of the direct injection vehicle is simpler than the circuit, and the inspection of some electronically controlled high-pressure common rail engines is more complicated. Generally, you can check from the following steps.
Check whether there is enough fuel
First, check whether there is oil in the fuel tank. You may think this step is too incredible, but in fact, there are not a few owners who can't catch fire because the fuel tank is out of oil.
A car with a good fuel gauge can observe the fuel volume of the fuel tank through the fuel gauge, but Xiaobian suggests that at this time, it is best to check whether there is enough fuel in the fuel tank through the fuel level gauge or open the fuel tank cover. After all, the fuel gauge will also fail.
Drain water from oil-water separator
After determining that there is enough diesel fuel for ignition in the oil tank, the next step is the oil-water separator. In fact, many engine owners do not have the habit of discharging water to the oil-water separator every day. If the quality of the oil used is not high, it may be unable to start due to too much water in the diesel. The oil-water separator generally has a red buoy. The density of this buoy is between diesel and water, so it will float on the water surface and be at the point of diesel. When observing that the buoy of the oil-water separator is in the middle, unscrew the drain bolt at the bottom of the oil-water separator in time to drain the water. This should be done for each oil-water separator.
Engine exhaust air
After eliminating the cause of excessive moisture in diesel, if the fire cannot be started, the next step is to check whether the diesel is mixed with air. First, find the location of the hand pump. The installation location of the hand pump of engines of different brands is different. Some are installed near the diesel pump, and some are equipped with an electronic oil pump, so there is no need to exhaust air manually. At present, most of the hand pumps of excavators on sale are installed above the oil-water separator, Loosen the vent bolt next to the hand oil pump, press the hand oil pump by hand until the vent bolt is full of diesel, and then tighten the vent bolt to complete the air exhaust work.
Generally, after checking the circuit and oil circuit, you can start the car. At this time, if you still can't start the fire, you should consider the mechanical reasons.
mechanical failure
If there is no problem in the circuit and oil circuit after inspection, it may be a mechanical fault caused by the engine.
Generally, the probability of mechanical failure of diesel engine is relatively low, but once there is a mechanical failure, the engine will be overhauled. The common mechanical failures of engine include cylinder pulling, tile burning, cylinder tamping, etc. generally, the mechanical failure of engine is a precursor, such as the sudden weakness of engine operation in normal operation, or the total black smoke and abnormal noise during operation.
Overhaul engine
Most of the mechanical failures occur when the engine is working. The probability of mechanical failure during cold start is low. In addition, in case of mechanical failure of the engine of the general excavator, the engine needs to be hoisted for disassembly and maintenance. It is recommended to find the after-sales department or professional engine maintenance personnel for maintenance.
