A pure imported Cat320A hydraulic excavator, white to the pazepam construction project construction site, in the road reconstruction project is slow, excavated, when the arm or bucket stick to the end, the engine is suffocating the car. Because the project is relatively tight, it is not treated for the time being.
[details of Cat320A whole machine]
Model: Caterpillar CAT320A
Working hours: 21000 hours
Date of purchase: 01 month of 2000
Import: import machine
Current state: construction is under way
Cat320A excavated without force, cause and repair method of holding rod when extending rod
The control of the digging speed and excavating force of the excavator with a computer is realized by the control of the pilot oil path by the proportional solenoid valve based on the external load change according to the external load change. Therefore, the pilot oil pressure should be checked first, and the pressure is 3.9Mpa for normal; then the pilot oil path is checked, and the method can be checked according to the (Figure 1) method. Proportional solenoid valve. On the single wire of a large proportional solenoid valve with a direct current clamp table (mA gear), the mode switch is put on the load, the engine is started, the action is done, and the clamp type is no current.
Unplug the plug, open the key switch, test the input voltage of about 24V, normal, the proportional solenoid valve end resistance infinity, indicating the proportional solenoid valve coil circuit breakage. Dismantle the proportional solenoid valve 1 check, found that the wire sealing wire has been tired and broken. The re welding glue sealed back to the test car, when do moving, the DC clamp type readings change between 250-300mA, the whole car Normal function and troubleshooting.
Extended reading: the difference between Cat320A and Cat320V2 excavator?
V1 engine valve chamber cover sealant bar is similar to 200B slot type, V2 is embedded. The hydraulic pump is also different, the main difference is the right side has no valve block, the valve block is V1, the valve block is V2. and the operating lever hydraulic lock handle is different, the cylinder is V1, the handle type is the electromagnetic valve group next to the V2. hydraulic pump, and the solenoid valve group is also not Also, near the door is V1. The one on the side is the side door of the V2. tank side, which is different from that. V1 is fixed with screws, and V2. is fixed with glue handles.
