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Home - News - Why does the excavator vibrate abnormally? Can it be solved completely

Why does the excavator vibrate abnormally? Can it be solved completely

March 18, 2021

What are the reasons for the abnormal vibration of the excavator? How to solve it?
1. Engine vibration

The engine is the main source of vibration for excavators. The engine displacement of excavators is generally large, which will produce a lot of vibration during normal operation. Therefore, a flexible connection is adopted between the engine and the fuselage. Under the action of the buffer mechanism, the vibration transmitted by the engine to the fuselage will be greatly weakened, so that the vibration of the fuselage will be controlled within a reasonable range. If the fixing screw of the engine foot pad is loose or the buffer block is fatigued and damaged, the connection between the engine and the fuselage will be loose, and the buffer mechanism will lose its function, causing the engine to shake violently during operation and drive the excavator's fuselage to abnormally vibrate.

Solution: Tighten the machine foot fixing screws or replace the buffer block.

2. Vibration of the rotating mechanism
When the upper car body rotates, it vibrates, freezes, and makes a "chucking" sound. It can be judged that there is a problem with the rotating mechanism. Since the rotating mechanism of the excavator is mainly composed of a set of planetary gear sets, due to the presence of impurities between the gears or excessive gear wear, abnormal meshing between the gears will cause the entire gear set to run poorly and eventually cause the upper body Unusual vibration occurs during rotation.

Solution: Check and clean the impurities in the planetary gear set. If the gear is damaged, replace it in time.

3. Boom vibration
When abnormal vibration occurs during the boom raising or lowering process, and the movement is not running smoothly, it is basically determined that there is a problem with the hydraulic system. Abnormal wear of the one-way valve of the boom hydraulic cylinder or the hydraulic oil contains impurities, resulting in poor spool switching and discontinuous flow of hydraulic oil, causing the hydraulic cylinder to freeze and eventually cause abnormal vibration of the boom.

Solution: Check and clean the one-way valve of the hydraulic cylinder. If the one-way valve is excessively worn, replace it in time.

4. Vibration in the cab
The abnormal vibration of the cab is the one that can be most felt by the operator. When the screw connecting and fixing the cab and the fuselage is loose, the cab will shake larger than the fuselage. Due to the principle of resonance, when the engine is in a specific The vibration of the cab is particularly strong at the speed.

Solution: Check and tighten the fixing screws of the cab base.
5. Hydraulic pump vibration
The vibration of the main hydraulic pump will also cause abnormal vibration of the whole machine. The vibration of the hydraulic pump is mainly caused by the discontinuous flow of the oil in the pump. Since the hydraulic pump produces high-pressure oil, once the oil fluctuates, it will inevitably cause the pump body to vibrate. When the oil is mixed with gas, cavitation occurs, or there are too many iron filings and other impurities in the oil, the plunger is excessively worn and the plunger is not running smoothly, which will cause the pump body to vibrate. In addition, the oil supply pipeline of the hydraulic pump is blocked, and the pump body is not smoothly supplied with oil, which may also cause vibration.