Excavator weakness - the cause of failure and maintenance method!

There are many kinds of excavator is unable to have the name, for example: "Anhui excavator repair excavator boring" excavator no effort ", refers to the manipulation of excavator walking, digging machine digging machine in the operation of rotation (rotation), large (small) excavator bucket excavator arm lifting and telescopic type action speed slow phenomenon. Lead to an impact on the efficiency of the work of the excavator failure.

Excavator inability classification:

1, excavator weakness, inability of working (cold / hot car to car to excavator)

2, the excavator's walking weakness (left / right to walk, or left and right side of the walk are relatively weak)

3, excavator rotation (rotation) powerless

4, big / small arms to lift machine

5, digging bucket / bucket rod telescopic weakness

Excavator unable reason:

The failure phenomenon of the excavator to give a detailed description:

1, excavator excavator work powerless or powerless, can be divided into two types: Excavator cold car powerless and hot excavator's weakness.

The main overflow valve failure, unloading valve, hydraulic pump failure, PC-EPC valve failure, engine speed sensor damage, distributor seal damage, control valve seal is not good, the pilot valve failure, valve plug and so on.

The machine described above except fault reason is unable to the outside, and the hydraulic system of hydraulic oil used in excavator digging machine is too dirty and polluted, the hydraulic system leak / leakage, cause flow value is lower than the required value of the excavator hydraulic pump pressure valve value. In addition, after digging machine hot weakness may be the main pump due to wear, due to the increase of the excavator hydraulic oil temperature, oil leakage will lead to increased machine pressure is not enough, unable to work.

2, the excavator walking weakness common reasons

The excavator engine long time overload operation, resulting in the lack of power, weakness phenomenon;

The excavator PC valve wear damage;

The excavator walking motor overflow pressure relief valve or not digging machine running motor wear;

The adjustment of the main relief valve defects digging machine;

The left and right sides of excavator walking motor walking pressure values are not consistent.

3, excavator rotation (rotation) can not common reasons

The machine work in turn rotary weakness caused by two aspects: excavator excavator hydraulic circuit fault and fault.

If is the circuit fault cause, need to check the voltage display and digging machine wire joint resistance.

If the hydraulic failure caused, common causes are: the internal components of excavator rotary pump wear and digging machine with oil pan (valve plate), pump control valve wear machine broken, digging machine rotating around the pressure value is high or low, rotary pump internal pressure relief, excavator rotary motor seal failure sealing oil leakage is not good, wide overflow improper adjustment, rotary motor overload.

4, a large excavator (small) to a common cause of lifting arm

The large (small) arm oil road congestion, poor fuel supply; pump inlet filter blocked, pump suction no oil.

II large (small) arm cylinder leakage / internal leakage.

Large (small) arm hydraulic cylinder leakage.

The oil quantity is not enough.

The (small) arm to hold the valve card or maintain valve damage.

The overflow valve is blocked or damaged.

5, digging bucket (ARM) to a common cause of expansion

A multi - way valve (main control valve) system is stuck or leaking.

II multi valve on the valve spool wear.

The bucket (ARM) cylinder assembly wear / damage.

The bucket (ARM) spool stuck / wear.

The bucket (ARM) regeneration loop valve, one-way valve return spring is too weak.