Author: Date of release of Jupeng Machinery:2018-11-26
Frequency of attention:2386
Excavator startup weakness refers to the mechanical equipment in the process of starting the engine, the engine speed can not be lifted, resulting in engine startup difficulties, no ignition, which is commonly known as: can not hit the car. So what will affect the inability to start?
The reasons for the failure are as follows:
1. Oil, in the environment where the temperature exceeds 10 C below zero, I suggest replacing 10W-30 oil, because 30 oil will be thinner and not too viscous, which can improve the speed of engine cold start and make the engine ignite smoothly. Some people here may be worried about whether the lack of oil will affect the life of the engine, or whether it will affect the life of the engine. Will the engine be damaged? No, absolutely not. The engine oil pressure has nothing to do with the viscosity of the oil. Many people mistakenly think that the oil is more viscous, the oil pressure is better, and the engine is better. If the oil is thin, the engine oil pressure will be lower and the engine will be damaged. In fact, this is a big misunderstanding, as long as it is a genuine machine. Oil, there is no organic oil pressure level will be related to the consistency of the oil, engine oil, like human blood, is very important! uuuuuuuuuuu Therefore, at any time, it is recommended that you use the proper oil in different seasons to protect and prolong the life of the engine.
2. Starter, starter, before winter comes, must do a maintenance, change the sleeve, carbon brush and some worn things, the rotor is clean, because the weather is cold, when the cold car engine oil is more sticky, the workload of the starter is much higher than that of the warm season, maybe it's okay to use it in peacetime. But it's not going to work in winter. Maintenance, spend a little money, make sure the starter works at its best power, and help you get ready to go!
3. Batteries (that is, batteries), battery voltage is insufficient, in winter cold weather, battery energy is not completely volatilized, so every winter, is the best time for battery sales, of course, if conditions, drivers and friends may find a thick quilt to wrap up the batteries or make one. Simple insulation measures, although not very effective, but at least can also prolong the battery life, if you don't mind the trouble, you can remove the battery and put it in a warm room, when you use it, and then install it, of course, better, haha... But now most people will choose to replace the new batteries directly. Maybe everyone is trying to save their minds too! uuuuuuuuuuu
4. Low overflow pressure of main relief valve
The main relief valve limits the maximum pressure of the whole hydraulic system to 32.5 MPa. For high pressures above this value, the main relief valve will be opened and unloaded to protect the system from damage. If the main relief valve spool is blocked due to poor oil quality and the spool is often open, or the set relief pressure of the main relief valve is low, the actual overflow pressure will be low, that is, the system pressure is low.
5. Failure of unloading valve
When the driver starts the engine and puts the lever in neutral, the output hydraulic oil of the main pump returns directly to the tank through the unloading valve, and the unloading pressure is 3 MPa. If the discharging valve spool is not closed tightly because of the dirty oil, when the machine is working, the output oil of the main pump will pass through the discharging valve to the oil tank directly, which makes the system unable to establish high pressure. Similarly, if the 0-ring on the discharging valve is damaged, the hydraulic oil of the main pump will flow back directly to the oil tank. Box.
6. Low pressure of main pump
The excavator adopts a dual swashplate axial variable piston pump. Normally, the output oil pressure of the main pump is more than 30 MPa. If the wear amount between the plunger and the cylinder body or between the end face of the cylinder body and the valve plate of the main pump exceeds the standard (the gap between the plunger and the cylinder body should be less than 0.02mm, and the contact area between the cylinder body and the valve plate should not be less than 90%), it will cause the output pressure of the main pump to be lower, which will be reflected in the working device of the machine. The phenomena of inadequate operation of the whole machine.