First remove the two rotary air release valves around the rotating motor to improve the performance of the valve body and sealing ring. Disassemble the rotating motor, the cylinder and distribution disc can not find the initial grinding phenomenon, and the working gap is good. Make sure the magazine springs properly and won’t break. The seals on the brake pressure plates are also intact.
Check the brake oil return passage. It can be seen that there are colloidal particles in the oil return hole, and the hole is not completely blocked, so the oil return is slow and time-consuming, and the brake parts work. Therefore, when the swing motion stops, the slip amount (jump angle) becomes excessively large.
After determining the cause of the failure, engineers began cleaning the components, paying special attention to the orifices and small oil passages. After a thorough cleaning, install the components and test the vehicle.
What is the reason for the engine speed out of control of the excavator?
Too much air filter oil in inertial oil bath. It is sucked into the cylinder and burned. It’s the same as increasing the fuel supply, but speeding up and accelerating.
A bent or installed oil plug may cause the fuel injection pump plunger to turn and lose the governor bracket. In particular, the multi-cylinder oil pump is in the no-load state, and the fuel supply cannot be changed, resulting in a fault state.
The transmission sleeve of the governor of the single fuel injection pump of the single-cylinder diesel engine is stuck, causing the speed regulation to fail.
Part of the oil inlet hole and the oil return hole of the plunger sleeve of the fuel injection pump are on the same plane. If the screw on the plunger sleeve is too long and blocks the oil return hole, the oil quality will deteriorate and the oil supply will start. Surges can also cause acceleration.
The fuel pump adjustment gear is stuck in the fuel supply position, or the gear rack is disengaged from the governor lever and out of control.
Excessive lubrication of the governor casing will hinder the opening of the speed regulation and affect the speed regulation.
Excessive use of excavators for a long time will easily lead to excessive oil temperature, which is very harmful, especially in summer, when the outdoor temperature is relatively high, and it is normal for small excavators to work outdoors for a long time. What harm will it do?
The heat dissipation of the working machine of the mini excavator is not very good, so it will affect its machine temperature and the working rate will be reduced. Then our engineers will work very hard. The clutch and brake of the excavator will generate friction during the working process. There will also be high temperature that will cause wear and tear caused by high temperature, and it may burn out.
