Have you ever encountered the situation of crawler cranes walking "crooked" roads? ---Guangzhou crawler crane guide wheel manufacturer

Walking deviation is a common failure of crawler cranes, which often troubles crawler crane drivers. Today, the editor will give you an inventory of the failure analysis of the crawler crane walking deviation and the corresponding solutions. ---Guangzhou crawler crane guide wheel manufacturer

Case fault description: When moving forward, it is biased to the right and not biased when backing. Wandering when refueling.

The walking system of a crawler crane is mainly composed of mechanical parts (driving wheels, guide wheels, towing sprocket wheels, supporting wheels, crawlers) and hydraulic driving parts. Based on the principle of easy first and difficult later, analyze the mechanical part first.

1. Mechanical part

Mainly check two aspects: (1) whether the two crawlers are parallel (2) whether the center lines of the driving wheels, guide wheels, tow sprocket wheels and supporting wheels coincide. If there is a problem with any part of the two, the walking deviation will occur. But the phenomenon should be that both forward and backward deviations, and the fault is only deviation when forwarding, so it can be determined that it is not caused by the mechanical part, and then the hydraulic part needs to be analyzed. ---Guangzhou crawler crane guide wheel manufacturer

From the perspective of the traveling hydraulic system, failures in any part of the motor, brake valve, main valve, and joystick will cause deviation. According to experience, the order of failure rate from high to low is motor, joystick, Main valve, brake valve.

2. Motor

The main fault of the motor is the large internal leakage. If the internal leakage of the right motor is large and the volumetric efficiency becomes low, the speed of the right motor will be lower than that of the left motor, and this situation will cause both forward and backward deviations to the right. , So it can be determined that it is not a motor failure.

3. Operation handle

The common faults of the main valve are large leakage in the valve, resulting in large flow loss; or the hydraulic system is not clean, causing the valve core to jam, the valve opening is incomplete, and the flow is small. Because the forward and backward are both completed by the same spool in the main valve, if the leakage in the valve is large, both forward and backward should run off. Therefore, it can be determined that the possibility of a large leakage in the main valve is very small. ---Guangzhou crawler crane guide wheel manufacturer

4. Brake valve

The common fault of the brake valve is large leakage in the valve or improper spool movement. If there is a large leakage in the valve, it will deviate from forward and backward, and it is determined that the failure of the large leakage in the valve is small. If the valve core is blocked by debris or the throttle inside the valve is blocked, the valve core does not move properly, the valve opening is small, the hydraulic oil throughput is small, and the deviation is caused. When the throttle is high, the pressure and flow loss will be large, and the deviation will be caused. Will be serious.

Therefore, connect a pressure gauge to the oil inlet of the left and right main valves to do a walking test, and it is found that the left and right pressures are the same when retreating. However, the pressure difference between the left and right is not great if the throttle is low; if the throttle is large, the pressure on the right is several megapascals higher than that on the left. When the throttle is small, the hydraulic flow is small, and the pressure and flow loss is small. When the throttle is large, the pressure and flow loss are larger. Therefore, it causes the phenomenon of deviation to the right when forwarding, no deviation when backing, and deviation when refueling. ---Guangzhou crawler crane guide wheel manufacturer

From the above analysis, we can see that there are many reasons for crawler crane walking failure. The editor here is a warm reminder: when you encounter a walking fault problem, you must calmly analyze and check step by step to find the real cause.