Excavator is a kind of heavy construction machinery, which is mainly used for digging, moving and loading materials such as soil and rock. It drives the bucket and arm through the hydraulic system to realize the excavation and handling of materials. The working principle is to provide power through the engine, drive the hydraulic pump to produce high-pressure oil, and then control the bucket and arm expansion and rotation, to complete the excavation operation. In daily operation, excavator users often encounter the problem of slow bucket movement, whether it is a single movement or a combination of operations, it may appear to be incompetent.

To address this challenge, the LTMG Team offers valuable insights and methods to help you accurately diagnose the problem and implement timely and effective solutions, ensuring your equipment remains in optimal condition and enhances operational efficiency.

Inspection process for slow bucket action:

First, operate the other actuators to determine if the problem is limited to the bucket, if the problem is limited to the bucket, check that the diesel engine is running at rated speed and operate the pilot valve to overflow the bucket large chamber.

Bucket large chamber merge check:

Check for oil flow by touching both high pressure fuel lines to determine if the bucket large chambers are merged.

Possible causes and solutions:

Bucket Large Chamber Secondary Relief Valve Problem: Check and adjust the relief pressure value, replace the spring or remove foreign material between the spool and spool seat if necessary.

Bucket cylinder piston seal is damaged: replace the piston seal.

Piston rod bent: correct, repair or replace the piston rod.

Valve group oil outlet pipe without oil flu: check whether the valve stem is bonded or stuck by foreign matter, whether the pilot control oil pressure is too low, or whether the pilot control pipeline is blocked by foreign matter.

Valve group II oil outlet pipe no oil flu: check whether the pilot pipe joint is loose, and whether the multi-way reversing valve stem has pilot reversing pressure.

Daily maintenance and care:

Avoid using violent operation, especially when encountering hard objects, to prevent damage to the cylinder. Regular inspection and maintenance, especially for oil seals and other consumable parts, should be replaced in time to avoid failure.

Additional suggestions:

① Regularly check the cleanliness and oil level of the hydraulic oil to ensure that the hydraulic system works properly.

② Check the viscosity of the hydraulic oil, because changes in oil temperature will affect the viscosity of the oil, which in turn affects the performance of the hydraulic system.

③ Change the hydraulic oil and oil filter regularly to minimize wear and contamination in the system.

By following these inspection procedures and maintenance recommendations, you can effectively diagnose and solve the problem of slow bucket action in the hydraulic system of your excavator, thus improving efficiency and prolonging the service life of your equipment.

LTMG has been manufacturing excavators for more than 23 years, and we have the top after-sales service in the industry, so that you can feel the professional service and at the same time, you can also know the LTMG products' Quality Assurance.