A Caterpillar cat324 excavator suddenly has no interest in the extension and retraction of the two arms (the extension and retraction are metaphorical variations within a certain limit). The action of the two arms is particularly slow, and the two arms are extended and recovered automatically When the excavator is working, its arm will fall off.
Analysis on the stiffness of the second arm of the excavator:
1. It may be that the stick overload holding valve of the excavator is too dirty. It is recommended that the stick overload holding valve on the main valve be removed for washing If the second arm of the excavator can be recovered, disassemble and clean the extended secondary overflow valve to see if the cone valve is worn?
2. There may also be internal leakage in the stick cylinder of the excavator. The internal oil seal of the stick cylinder should be replaced You can also remove the hexagonal screw plug on the spare valve body and replace it with the overflow valve on the second arm, and plug it into the mounting hole of the overflow valve
3. You can connect the oil pipe of the second arm of the harvester to the rotating oil pipe to see if it is a pilot problem? Is the filter element dirty? Check (check and test) whether the pressure of the two arms of the excavator is very low, or it may be caused by the circuit.
Analysis of excavator arm dropping:
1. The oil seal may be broken when the arm of the excavator falls off. Just replace the oil seal It may be internal leakage of excavator oil circuit / wear and pressure relief of distributor.
2. Patrol the boom retaining valve of the excavator, or the oil cylinder seal fails If the middle boom is recovered to the middle and stopped, it is normal. If the oil is not chased in time, all excavators will
3. Let's first look at the color of the inner core (that is, the silver pole) of the arm dropping hydraulic pump under natural light? If it's blue black or color, it's the oil seal problem. Just replace it If the oil seal is normal, the oil seal of the distribution valve is leaking. Replace the sealing ring of the distribution valve Generally, the oil seal shall be replaced before the arm of the excavator falls off. If the arm of the excavator falls off severely, the cylinder may be pulled.
