Garbage truck:Solution to no thrust and slow speed of the hydraulic cylinder
The hydraulic cylinder of a garbage truck is an executive element in the hydraulic system that converts hydraulic energy into mechanical energy. It is not uncommon that the hydraulic system of the garbage truck cannot be used normally due to the failure of the hydraulic cylinder, such as the hydraulic cylinder cannot drive the load during work. So how should the garbage truck deal with the failure of hydraulic cylinders without thrust and slow speed during use? Let's take a look at how the after-sales technicians analyze:
The failure of hydraulic cylinders to drive the load is mainly manifested as inaccurate piston rod stop, insufficient thrust, speed drop, unstable work, etc. The reasons are:
(1) Leakage inside the hydraulic cylinder. The internal leakage of the hydraulic cylinder includes the leakage caused by the hydraulic cylinder body seal, the seal of the piston rod and the sealing cover, and the excessive wear of the piston seal.
The reason for the leakage of the seal between the piston rod and the sealing cover is that the seal is wrinkled, squeezed, torn, worn, aging, deteriorated, deformed, etc. At this time, a new seal should be replaced.
The main reason for excessive wear of the piston seal is improper adjustment of the speed control valve, resulting in excessive back pressure and improper installation of the seal or contamination of the hydraulic oil. Secondly, foreign matter enters during assembly and the quality of the sealing material is not good. The consequence is slow movement and weakness. In severe cases, it will cause damage to the piston and cylinder, causing "cylinder pulling". The treatment method is to adjust the speed control valve, and make necessary operations and improvements in accordance with the installation instructions.
(2) Leakage of hydraulic circuit. Including leakage of valves and hydraulic lines. The maintenance method is to check and eliminate the leakage of the hydraulic connection pipeline by operating the reversing valve.
(3) The hydraulic oil is bypassed back to the oil tank through the overflow valve. If dirt enters the overflow valve and jams the spool, making the overflow valve normally open, the hydraulic oil will bypass the overflow valve and directly flow back to the tank, causing no oil to enter the hydraulic cylinder. If the load is too large, although the regulating pressure of the relief valve has reached the maximum rated value, the hydraulic cylinder still cannot get the thrust required for continuous action and does not move. If the adjustment pressure is low, the vertebral force required for still loading cannot be achieved due to insufficient pressure, which manifests as insufficient thrust. At this time, check and adjust the overflow valve.
The above is the troubleshooting of the hydraulic cylinder of the garbage truck with no thrust and slow speed. When drivers and friends find that the hydraulic system of the garbage truck is not working well, you can check whether the hydraulic cylinder cannot drive the load. If it is, please check the reason carefully and take it solve.
