Fault solution of sunward SWE130W bucket hydraulic cylinder

A 130 hydraulic excavator, bucket hydraulic cylinder telescopic tubing occurred in the operation when the vibration and noise of hydraulic motor by turning around it, and the hydraulic motor has large vibration. Immediately dispatched repair master to understand the situation, to solve the problem.

First of all, to understand this as SWE130W excavator use.

Factory time: 2011,

Use time: 8000 hours

Location: Shapingba District, Chongqing

Two, sunward excavator SWE130W inspection found fault phenomenon:

1, when walking, the tubing of the left motor is also vibrating, without any action, the system pipeline vibration

2, several other actions when the system is normal, the amount of oil and oil to meet the requirements.

3, a month ago, the whole car repairs. The hydraulic pump oil inlet and outlet one-way valve replacement; Madane curve has a larger rotary hydraulic pump wear; normal humidity; primary loop pressure, normal pressure valve group before, after the group valve loop pressure fluctuation; hydraulic pump out of the air bubble, but a piston exhaust flow of oil or fuel -- is not normal.

Three, sunward excavator bucket hydraulic cylinder jitter analysis of rotary sound fault:

1, there is the fault action control valve group, for the same main circuit. So the fault may be in the public or the circuit element is air, hydraulic pump, main valve or loop with air. The latter may be excluded (no exhaust air system), but found a single piston pump the oil is not normal, normal temperature and pump outlet check valve, that no fault (after a fault analysis, thus the judgment) into the hydraulic valve failure may be, after treatment system is normal, indicating that the total safety valve failure.

2, hydraulic pump work, action pump hydraulic valve with high frequency, 1500 to 1800 times per minute, but the spring stiffness is very small, the stem diameter of 6mm thread is M6, most likely occurred as a result of the fault for the assembly when the nuts are too hard. Tighten the nut should be in 20N m left and right.

Four, Sunward Intelligent SWE130W fault diagnosis and elimination:

Remove the hydraulic pump into the oil tank shell, check the oil inlet check valve, the abnormal plunger distribution chamber when the exhaust, the hydraulic valve stem is broken at the nut, after replacement, troubleshooting