What are the causes and solutions of excavator abnormal noise

The excavator in the process of operating abnormal noise is how to return a responsibility, what kind of treatment we have, what is the cause of abnormal noise, now I give us to analyze.

1. Grease and drain out of the shaft sleeve.

2. If the gap between the piston and the cylinder of excavator is too large, the sound of when or when tapping is announced in the cylinder, especially when the speed changes suddenly or when the speed is low or the load is large, and the sound becomes weaker when the temperature rises.

The gap between the piston pin and the connecting rod bushing of the excavator is too large, so a loud crash sound is announced in the upper part of the cylinder, especially when the sudden change is from low speed to high speed.

Excavator crankshaft spindle neck and bush gap is too large, in the main bearing can be heard boring crash sound, with the load added, the noise increases, the sensation increases.

The gap between the crankshaft connecting rod journal and the bearing bush is too large. Identify the cylinder where the noise occurs, check the tightness of the connecting rod cover, or replace the connecting rod bearing bush.

Crankshaft thrust plates wear too much, crankshaft shaft swimming. Replace the thrust plates in time.

Large valve gap. Adjust valve gap to regular range according to installation skill.

Oil supply early Angle is too small, exhaust pipe blasting, announced in the cylinder depressed knock sound. Oil supply early Angle adjustment according to the rules.

3. After replacing the inverted motor of the excavator, the fault was still found.

After cleaning up the inversion motor problem, continue to check, found that the oil return back pressure valve is stuck by welding, can not be closed.

Replace the new oil return back pressure assembly to remove abnormal noise in excavator operation.

4. Observe the excellent smoke condition of the excavator engine, without black smoke or blue and white smoke. The starting function is basically normal, but the power of the engine is decreased during the excavator operation.

When the engine is accelerating rapidly, there is a severe knocking sound at the junction of the upper part of the cylinder block and the cylinder head.

In the experiment of broken cylinder, the striking sound disappeared not significantly.

Check the air filter element and air inlet hose for no blockage and contraction.

Check the valve gap of each cylinder is normal.

Remove the injector to the test bench to verify that the spray is in excellent condition.

No metal impurities were found in the oil discharged from the oil sump, and wear or abnormal damage was removed from the mechanical parts.

Found problems when checking the fuel injection pump, oil supply time lag severe, adjust the oil supply time, sweep away excavator operation abnormal noise.