According to experience, it is about the failure of the big and small arm of the excavator. Recently, the main organic caller consulted to understand that the failure phenomenon of the two arms of the excavator was weak, and the failure of the arm of the excavator also appeared.Let's take a look at the common reasons and simple treatment of this article. method.
A Cat 324 excavator suddenly expands and contracts the two arms of the excavator (the metaphor of extending and retracting within a certain limit) is boring, the movement of the two arms is particularly slow, and the two arms are straightened and automatically recovered. Arm off.
Digging machine two-arm telescopic analysis:
1. It may be that the overload holding valve of the excavator stick is too dirty. It is recommended that the arm overload holding valve on the main valve can be removed and washed. If the two arms of the excavator can be recovered, the secondary overflow valve that extends out Disassemble and clean it to see if the cone valve is worn?
2. There may also be a leak in the arm cylinder of the excavator, and the internal oil seal of the arm cylinder needs to be replaced. The hexagon socket screw plug on the spare valve body can also be removed and replaced with the overflow valve of the two arms to plug it. Into the mounting hole of the relief valve.
3. You can connect the tubing of the second arm of the excavator to the rotating tubing to see if it is a pilot problem? Check whether the filter element is dirty? Check (check and test) whether the pressure of the two arms of the excavator is very low, or may be Caused by the circuit.
Analysis of excavator arm drop:
1. The oil seal may be broken when the arm of the excavator is broken, just change the oil seal. It may be that the oil in the excavator is leaking or the distributor is worn out to relieve the pressure.
2. Check the arm holding valve of the excavator, or the seal of the oil cylinder is invalid. If the middle arm is recovered to the middle stop, it is normal. The oil recovery is not timely, and all excavators will.
3. First look at the color of the inner core of the hydraulic pump that dropped the arm (that is, the silver-white rod) under natural light. If it is blue, black or colored, it is the problem of the oil seal. Change it. If the oil seal is normal, it is If the oil seal of the distribution valve is leaking, replace the seal ring of the distribution valve. Under normal circumstances, the arm of the excavator should be replaced with a set of oil seals first. If the arm of the excavator is damaged, the cylinder may be pulled.
