As the price of excavators decreases, competition in the excavator rental industry becomes fierce. Increasing the diversity of excavator attachments is an excellent choice to increase their competitiveness.

Among them, quick hitch couplers have become the necessary excavator attachment because they can quickly replace other attachments. Hydraulic quick hitch coupler installation requirement is more than mechanical type. The hydraulic cylinder is easy to not stretch and retract during use. The following are the reasons and solutions summarized by the editor.

Circuit or solenoid valve problems

Circuit problems

The wire is broken, the virtual connection is not energized, and the solenoid valve cannot work.


Check whether there is any disconnection or virtual connection in the circuit, and re-wiring.

solenoid valve Problems

The solenoid valve is damaged due to collision during use and cannot work.


If the solenoid coil is damaged, replace the solenoid coil, or replace the complete solenoid valve.

Cylinder problems

Each cylinder is equipped with a valve core, which is also a check valve. When there is a lot of hydraulic oil, it is easy to jam, causing the cylinder to not retract.


Remove the valve core, clean it in diesel oil, and then install it.

To meet the demand of the first demolition, JIANGTU R & D team added a 360-degree rotation function on the pulverizer to improve the maneuverability and precision of accurate operation, It is suitable for the first demolition of floors with different angles and directions.

seals of the oil cylinder

Damage to the seals of the oil cylinder will also cause the cylinder to not work.


Replace the seals or replace the cylinder assembly.

Safety pin problem

The safety pin was not pulled out when replacing the attachment, causing the cylinder to not be retracted. This editor has also encountered this situation.


Pull out the safety pin.

Quick Hitch Coupler

JIANGTU Excavator quick couplers, also named as a quick hitch, bucket pin grabber, quick connector, can quickly connect various attachments (bucket, hydraulic breaker, plate compactor, log grapple, ripper, etc.) on excavators, which can expand the scope of use of excavators and can save time and improve working efficiency.

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