Why SY305 31 excavator is crazy"

Chongqing Banan District Ding Chuang boss to repair the master "digging machine mad, whirring toward one side has to stop rotating, frighten side workers are not working." listen to the boss told Ding fault phenomenon, the feeling is not his machine is broken, and finally he said the bucket stuck in the ground, the engine stopped next we have to solve this. Why "mad Y305 31 excavator".

According to Ding boss telephone description, basically roughly understand the 31 excavator turning to the side, the cause of the failure of rotary brake:

1. rotary brake pad wear

2. the brake disc has foreign substance infiltration, and the brake pad can not return

3. piston and valve plate wear seriously, brake failure

4. bypass valve has foreign body stuck, can not break the oil, resulting in the brake can not be back

5. overload valve blocking leads to turning to one side, unable to brake

Maintenance process:

First, the tubing is disassembled, basically, all kinds of rotary motors are more than five oil pipes, and the left and right turn two, return oil two, brake one, do not deliberately remember, because the pipeline direction is different. After removal, clean the appearance, prevent the motor open two times pollution

Open the motor to have ideas, remember each step, prevent the installation of confusion. Take down the cover screw, the first saw is a circle of brake spring, composed of sixteen, the top cover yellow is the valve plate

First, then get out of the cylinder, the plunger with a screwdriver, gently press the brake disc, brake plate is next to a gap. And then remove the brake pad and the brake disc, not too big strength, prevent brake disc and brake brake if the deformation, deformation, put back the plunger driving, to replace one set the brakes, error error in money. Try to be careful.

After take out one by one, first check valve plate, the valve plate has a groove found, wear is not very calendar harm, you can also use the copper cap, the plunger has not found excessive wear, abalone board also found no fault anomalies, also did not wear the swash plate deep, thimble and cup no wear, brake pads too much change, are checked, and then clean diesel.

Then remove the bypass valve cleaning, also found no spring fracture, thimble is intact, the problem is not big

The two overload valve removed, the overload valve was called horn valve, also called the safety valve, anyway, around the name, the same object is not the same name, see the articles on the line. The O ring check above, the white part is a buffer ring, is to prevent excessive pressure, play the protection effect of O ring.O ring also found no burr foaming phenomenon.

The overload valve core is opened entirely, basically the size of excavator are similar, it is similar, is a thimble, spring, adjusting valve, shell composed of several parts. Check there is no exception, clean diesel, turn back, if not a general adjustment spool, no need of adjustment.

All after cleaning, as it is put back. Although all check found no problems, but also can not find the crux of the problem, but also worried that happened two times, palliatives is of no use, and then to use this machine to machine main machine, this machine main plunger said ten thousand hours inside the pump. Cylinder and other parts, all destroyed, then replace the pump parts cleaned multiple valves, but also found that sometimes occur when using the card hysteresis phenomenon, action is not very coherent, a few seconds good, plus the leakage of hydraulic oil pump repair after serious, five thousand hours have not replaced the hydraulic oil. Less plus a month, plus more than 20 liters of appearance, think every month and there is no need to change.

Listen to the Ding boss a call, and finally find the crux of the problem, is the maintenance of large pump cleaning is not clean, while cleaning up the multi valve, cylinder and oil but also left debris and other debris, plus a long time does not change the hydraulic oil, cause two pollution, resulting in the situation, in order to more thorough sequelae of solution as follows: the replacement of hydraulic oil, must filter, hydraulic oil tank cleaning. Use one hundred hours to change the hydraulic oil and filter. To connect the clean barrel with hydraulic oil change, still half a month later, then the hydraulic oil filter, can be used in filtering stockings, left abandoned the bottom of the bucket, hydraulic filter can be used for the two time.

After the 31 SY305 excavator was repaired, the manager in accordance with my method, stuck phenomenon was not found, the oil temperature is also low, and the use is almost one hundred hours normal

After this incident, we should understand the principle of maintenance of excavator must not lazy, nor in order to save money and reduce maintenance procedures, otherwise it will appear in other machines, hinder the smooth progress of the project.