Kobelco 60-8 hydraulic pump pilot pump gear pump auxiliary pump tail pump

Kobelco excavator common fault repair
Kobelco excavator FAQs, you must have what you want.

first question
The Kobelco SK200-8 has 11,290 hours now. I am engaged in earthmoving work. It has been difficult to walk recently. The climb is a bit steep and I cannot move. The descent is like a rabbit. Walking left is faster than walking right, which has affected normal work. May I ask what is the reason?
Answer: 1. For excavator deviation, first check whether the tightness of the crawler tracks is consistent.
2. Use a hydraulic pump to detect the pressure of the excavator's traveling pump within the normal range. If the pressure value exceeds the standard value, leakage will occur inside the excavator, and a part of the high-pressure oil will flow back into the oil pipe, which will cause one side of the excavator to Having trouble walking.
3. Replace the excavator's rotary joint oil seal to see if the deviation is changing. If there is no change, the rotary joint is normal.
4. Check whether the slide valve of the excavator's travel control valve is blocked (if the gap between the slide valve and the valve hole is too large, it will cause the excavator to run away without power on one side);
5. Check the pressure value of the safety valve of the excavator operation control valve.
6. Check the pressure at the inlet of the walking motor (if the pressure is low, it will cause the excavator to walk on one side and escape).

second question
Kobelco SK200-8 cannot walk and will stop.
Answer: 1. The hydraulic pump and its control system are faulty. Test the P1 and P2 pump pressure. The normal value should be 32-34M.
2. Test the pilot oil pressure. The pressure is always around 3.0M.
3. Check whether the valve core and valve seat of the traveling system control valve are worn.
4. Check the pressure of the stepper motor.

Start association
My Kobelco SK75 excavator does not start properly during hot start and has been working for 5000 hours. It took 1 to 2 seconds to start up before 5000 hours, now it takes 5 seconds to start up. What's the reason for asking?

Answer: First check whether the oil filter element is iron filings. If not, check the rotating motor. It is necessary to test whether the pressure and volume settings of the excavator meet the specified values.

Question 3: My Kobelco SK250-8 does not start well. The regulator plug of the hydraulic pump has fallen off. The car is more than a dozen. The after-sales service said that the regulator starts with pressure. There are two belts. The belt pressure is high, the pressure is low, and the pressure is high. The regulator plug was pulled out and the car was very hot. After the car was hit, it was clogged. It worked normally and the pressure was normal. Can the normal pressure be adjusted?

Answer: The regulator can be repaired. Maintaining the regulator requires professional maintenance personnel to disassemble and inspect the pipeline. The plug of the hydraulic pump regulator belongs to the emergency mode. It is recommended to pull the P1 and P2 pump regulators through the regulator by hand to see if the plug has been sent out, and maintenance personnel should perform repairs. After disassembly, the pump proportional valve can be cleaned using the pump.

Question 4: My Kobelco SK350LC-8 is not easy to start. When a fire breaks out from the screen, the pump with a pressure of 200-300 pounds on two pumps of one pump keeps beating and is not flammable. Is there any pressure that makes the car hard to start! where is the problem? There are no alerts on the display.
answer:
1. The main valve core of the multi-way valve is stuck;
2. The hysteresis valve is stuck or abnormal.
3. The hydraulic pump regulator is abnormal.
4. There may be abnormal low-voltage signals.

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