Repair steps for overheating of Komatsu PC200 excavator engine
5 maintenance methods for Komatsu PC200 excavator
【1】 5 maintenance methods for Komatsu PC200 excavator
【1】 5 maintenance methods for Komatsu excavator
【1】 The hydraulic system of Komatsu excavator may experience malfunctions such as low or weak working device, walking, and turning speed, which may be caused by the following reasons:
1. Poor adjustment of PC valve.
2. Poor LS valve assembly.
3. The PC valve assembly is damaged.
4. Hydraulic component failure in the output circuit of the pressure reducing valve
5. Piston pump malfunction.
6. Fault in the servo piston of the plunger pump.
7. The main overflow valve is not adjusted correctly.
8. The unloading valve is not functioning properly.
9. The main overflow valve is damaged.
The problem was solved and the solution was immediately presented.
【 Solution 】 Through fault analysis, the following solutions are obtained:
1. Adjust or repair the PC valve
2. Check and repair the LS valve
3. Maintenance of PC valve
4. Repair the hydraulic components of the pressure reducing valve output circuit or replace the hydraulic components of the pressure reducing valve output circuit
5. Maintenance of plunger pump
6. Repair or replace the servo piston of the plunger pump
7. Adjust the main overflow valve again
8. Adjust or repair the unloading valve
9. Repair the main overflow valve
Komatsu excavator maintenance
【2】 Three common causes of oil burning in Komatsu excavators:
1. The excavator air filter becomes dirty
2. Blowout of excavator engine
Excavator oil was not replaced properly or non genuine excavator oil was used
Solution to oil burning fault of Komatsu excavator:
1. Regularly clean and replace the excavator air filter
2. Overhaul the excavator engine
3. Use excavator engine oil according to regulations and use engine oil that matches the excavator
Komatsu excavator maintenance
【3】 Komatsu excavator deviates during walking
Cause 1: The possible reasons for deviation during normal walking are:
1. Pressure reducing valve malfunction.
2. Poor operation of the main control valve core.
3. The walking motor assembly is faulty.
4. LS valve is damaged.
5. The PPC valve is damaged.
6. The walking pressure compensation valve is malfunctioning.
The following solutions have been proposed for the first reason:
1. Maintenance of pressure reducing valve
2. Repair the main operating valve core
3. Check and repair the walking motor
4. Maintenance of LS valve
5. Maintenance of PPC valve
6. Maintenance of walking pressure compensation valve
Cause 2: The possible reasons for deviation during startup are:
1. Poor operation of the walking pressure compensation valve.
2. The throttle hole inside the servo mechanism is blocked.
The following solution is proposed for cause two:
1. Maintenance of walking pressure compensation valve
2. Clean or unclog the throttle hole inside the servo mechanism
Komatsu excavator maintenance
【4】 After using the Komatsu excavator for a period of time, many Komatsu excavator operators have encountered the fault of "the excavator cannot move during use (only one side cannot move)"
Cause:
1. Poor operation of the oil replenishment valve in the main control valve.
2. The safety valve of the walking motor is malfunctioning.
3. Poor terminal transmission.
4. The walking motor is damaged.
Solution:
1. Check and repair the oil replenishment valve
2. Check and repair the safety valve of the walking motor
3. Maintenance and adjustment of terminal drive
4. Check and repair the walking motor
Komatsu excavator maintenance
【5】 After using the Komatsu excavator for a period of time, many Komatsu excavator operators have reported a malfunction of "weak walking (or slow speed)".
Cause:
(I) The CO valve is malfunctioning.
(2) The CO cancellation solenoid valve has a malfunction.
(3) The set pressure of the main overflow valve decreases.
(4) The 2nd level overflow solenoid valve is faulty.
Solution:
1. Maintenance of CO valve
2. Cancel the solenoid valve for CO maintenance
3. Check if the set pressure of the main overflow valve has decreased
4. Repair the 2nd level overflow solenoid valve
Repair steps for engine overheating of Komatsu excavator
Once the connector of the thermal sensor (oil) is removed, does the alarm light turn off
Addendum: If it goes out, the thermal sensor (oil) is defective and needs to be repaired or replaced
Further check if the alarm light has turned off after removing the connector of CN23
Addendum: If it goes out, the wiring WY between the CN23 thermal switches will be short circuited and the wiring WY needs to be repaired
Further check if the alarm light has turned off after removing the connector of CN14. If it has not turned off, the monitor dashboard is defective and needs to be replaced
Addendum: If it goes out, the wiring WY between CN23 and CN14 will break and need to be repaired. Excavator repair method 5:
【1】 The hydraulic system of Komatsu excavator may experience malfunctions such as low or weak working device, walking, and turning speed, which may be caused by the following reasons:
1. Poor adjustment of PC valve.
2. Poor LS valve assembly.
3. The PC valve assembly is damaged.
4. Hydraulic component failure in the output circuit of the pressure reducing valve
5. Piston pump malfunction.
6. Fault in the servo piston of the plunger pump.
7. The main overflow valve is not adjusted correctly.
8. The unloading valve is not functioning properly.
9. The main overflow valve is damaged.
The problem was solved and the solution was immediately presented.
【 Solution 】 Through fault analysis, the following solutions are obtained:
1. Adjust or repair the PC valve
2. Check and repair the LS valve
3. Maintenance of PC valve
4. Repair the hydraulic components of the pressure reducing valve output circuit or replace the hydraulic components of the pressure reducing valve output circuit
5. Maintenance of plunger pump
6. Repair or replace the servo piston of the plunger pump
7. Adjust the main overflow valve again
8. Adjust or repair the unloading valve
9. Repair the main overflow valve
Komatsu excavator maintenance
【2】 Three common causes of oil burning in Komatsu excavators:
1. The excavator air filter becomes dirty
2. Blowout of excavator engine
Excavator oil was not replaced properly or non genuine excavator oil was used
Solution to oil burning fault of Komatsu excavator:
1. Regularly clean and replace the excavator air filter
2. Overhaul the excavator engine
3. Use excavator engine oil according to regulations and use engine oil that matches the excavator
Komatsu excavator maintenance
【3】 Komatsu excavator deviates during walking
Cause 1: The possible reasons for deviation during normal walking are:
1. Pressure reducing valve malfunction.
2. Poor operation of the main control valve core.
3. The walking motor assembly is faulty.
4. LS valve is damaged.
5. The PPC valve is damaged.
6. The walking pressure compensation valve is malfunctioning.
The following solutions have been proposed for the first reason:
1. Maintenance of pressure reducing valve
2. Repair the main operating valve core
3. Check and repair the walking motor
4. Maintenance of LS valve
5. Maintenance of PPC valve
6. Maintenance of walking pressure compensation valve
Cause 2: The possible reasons for deviation during startup are:
1. Poor operation of the walking pressure compensation valve.
2. The throttle hole inside the servo mechanism is blocked.
The following solution is proposed for cause two:
1. Maintenance of walking pressure compensation valve
2. Clean or unclog the throttle hole inside the servo mechanism
Komatsu excavator maintenance
【4】 After using the Komatsu excavator for a period of time, many Komatsu excavator operators have encountered the fault of "the excavator cannot move during use (only one side cannot move)"
Cause:
1. Poor operation of the oil replenishment valve in the main control valve.
2. The safety valve of the walking motor is malfunctioning.
3. Poor terminal transmission.
4. The walking motor is damaged.
Solution:
1. Check and repair the oil replenishment valve
2. Check and repair the safety valve of the walking motor
3. Maintenance and adjustment of terminal drive
4. Check and repair the walking motor
Komatsu excavator maintenance
【5】 After using the Komatsu excavator for a period of time, many Komatsu excavator operators have reported a malfunction of "weak walking (or slow speed)".
Cause:
(I) The CO valve is malfunctioning.
(2) The CO cancellation solenoid valve has a malfunction.
(3) The set pressure of the main overflow valve decreases.
(4) The 2nd level overflow solenoid valve is faulty.
Solution:
1. Maintenance of CO valve
2. Cancel the solenoid valve for CO maintenance
3. Check if the set pressure of the main overflow valve has decreased
4. Repair the 2nd level overflow solenoid valve
Repair steps for engine overheating of Komatsu excavator
Once the connector of the thermal sensor (oil) is removed, does the alarm light turn off
Addendum: If it goes out, the thermal sensor (oil) is defective and needs to be repaired or replaced
Further check if the alarm light has turned off after removing the connector of CN23
Addendum: If it goes out, the wiring WY between the CN23 thermal switches will be short circuited and the wiring WY needs to be repaired
Further check if the alarm light has turned off after removing the connector of CN14. If it has not turned off, the monitor dashboard is defective and needs to be replaced
Addendum: If it goes out, the wiring WY between CN23 and CN14 will break and need to be repaired. The hydraulic system of the excavator may experience low or weak working devices, walking, and turning speeds due to the following reasons:
1. Poor adjustment of PC valve.
2. Poor LS valve assembly.
3. The PC valve assembly is damaged.
4. Hydraulic component failure in the output circuit of the pressure reducing valve
5. Piston pump malfunction.
6. Fault in the servo piston of the plunger pump.
7. The main overflow valve is not adjusted correctly.
8. The unloading valve is not functioning properly.
9. The main overflow valve is damaged.
The problem was solved and the solution was immediately presented.
【 Solution 】 Through fault analysis, the following solutions are obtained:
1. Adjust or repair the PC valve
2. Check and repair the LS valve
3. Maintenance of PC valve
4. Repair the hydraulic components of the pressure reducing valve output circuit or replace the hydraulic components of the pressure reducing valve output circuit
5. Maintenance of plunger pump
6. Repair or replace the servo piston of the plunger pump
7. Adjust the main overflow valve again
8. Adjust or repair the unloading valve
9. Repair the main overflow valve
Komatsu excavator maintenance
【2】 Three common causes of oil burning in Komatsu excavators:
1. The excavator air filter becomes dirty
2. Blowout of excavator engine
Excavator oil was not replaced properly or non genuine excavator oil was used
Solution to oil burning fault of Komatsu excavator:
1. Regularly clean and replace the excavator air filter
2. Overhaul the excavator engine
3. Use excavator engine oil according to regulations and use engine oil that matches the excavator
Komatsu excavator maintenance
【3】 Komatsu excavator deviates during walking
Cause 1: The possible reasons for deviation during normal walking are:
1. Pressure reducing valve malfunction.
2. Poor operation of the main control valve core.
3. The walking motor assembly is faulty.
4. LS valve is damaged.
5. The PPC valve is damaged.
6. The walking pressure compensation valve is malfunctioning.
The following solutions have been proposed for the first reason:
1. Maintenance of pressure reducing valve
2. Repair the main operating valve core
3. Check and repair the walking motor
4. Maintenance of LS valve
5. Maintenance of PPC valve
6. Maintenance of walking pressure compensation valve
Cause 2: The possible reasons for deviation during startup are:
1. Poor operation of the walking pressure compensation valve.
2. The throttle hole inside the servo mechanism is blocked.
The following solution is proposed for cause two:
1. Maintenance of walking pressure compensation valve
2. Clean or unclog the throttle hole inside the servo mechanism
Komatsu excavator maintenance
【4】 After using the Komatsu excavator for a period of time, many Komatsu excavator operators have encountered the fault of "the excavator cannot move during use (only one side cannot move)"
Cause:
1. Poor operation of the oil replenishment valve in the main control valve.
2. The safety valve of the walking motor is malfunctioning.
3. Poor terminal transmission.
4. The walking motor is damaged.
Solution:
1. Check and repair the oil replenishment valve
2. Check and repair the safety valve of the walking motor
3. Maintenance and adjustment of terminal drive
4. Check and repair the walking motor
Komatsu excavator maintenance
【5】 After using the Komatsu excavator for a period of time, many Komatsu excavator operators have reported a malfunction of "weak walking (or slow speed)".
Cause:
(I) The CO valve is malfunctioning.
(2) The CO cancellation solenoid valve has a malfunction.
(3) The set pressure of the main overflow valve decreases.
(4) The 2nd level overflow solenoid valve is faulty.
Solution:
1. Maintenance of CO valve
2. Cancel the solenoid valve for CO maintenance
3. Check if the set pressure of the main overflow valve has decreased
4. Repair the 2nd level overflow solenoid valve
Repair steps for engine overheating of Komatsu excavator
Once the connector of the thermal sensor (oil) is removed, does the alarm light turn off
Addendum: If it goes out, the thermal sensor (oil) is defective and needs to be repaired or replaced
Further check if the alarm light has turned off after removing the connector of CN23
Addendum: If it goes out, the wiring WY between the CN23 thermal switches will be short circuited and the wiring WY needs to be repaired
Further check if the alarm light has turned off after removing the connector of CN14. If it has not turned off, the monitor dashboard is defective and needs to be replaced
Addendum: If it goes out, the wiring WY between CN23 and CN14 will break and need to be repaired. The hydraulic system of the excavator may experience low or weak working devices, walking, and turning speeds due to the following reasons:
1. Poor adjustment of PC valve.
2. Poor LS valve assembly.
3. The PC valve assembly is damaged.
4. Hydraulic component failure in the output circuit of the pressure reducing valve
5. Piston pump malfunction.
6. Fault in the servo piston of the plunger pump.
7. The main overflow valve is not adjusted correctly.
8. The unloading valve is not functioning properly.
9. The main overflow valve is damaged.
The problem was solved and the solution was immediately presented.
【 Solution 】 Through fault analysis, the following solutions are obtained:
1. Adjust or repair the PC valve
2. Check and repair the LS valve
3. Maintenance of PC valve
4. Repair the hydraulic components of the pressure reducing valve output circuit or replace the hydraulic components of the pressure reducing valve output circuit
5. Maintenance of plunger pump
6. Repair or replace the servo piston of the plunger pump
7. Adjust the main overflow valve again
8. Adjust or repair the unloading valve
9. Repair the main overflow valve
Komatsu excavator maintenance
【2】 Three common causes of oil burning in Komatsu excavators:
1. The excavator air filter becomes dirty
2. Blowout of excavator engine
Excavator oil was not replaced properly or non genuine excavator oil was used
Solution to oil burning fault of Komatsu excavator:
1. Regularly clean and replace the excavator air filter
2. Overhaul the excavator engine
3. Use excavator engine oil according to regulations and use engine oil that matches the excavator
Komatsu excavator maintenance
【3】 Komatsu excavator deviates during walking
Cause 1: The possible reasons for deviation during normal walking are:
1. Pressure reducing valve malfunction.
2. Poor operation of the main control valve core.
3. The walking motor assembly is faulty.
4. LS valve is damaged.
5. The PPC valve is damaged.
6. The walking pressure compensation valve is malfunctioning.
The following solutions have been proposed for the first reason:
1. Maintenance of pressure reducing valve
2. Repair the main operating valve core
3. Check and repair the walking motor
4. Maintenance of LS valve
5. Maintenance of PPC valve
6. Maintenance of walking pressure compensation valve
Cause 2: The possible reasons for deviation during startup are:
1. Poor operation of the walking pressure compensation valve.
2. The throttle hole inside the servo mechanism is blocked.
The following solution is proposed for cause two:
1. Maintenance of walking pressure compensation valve
2. Clean or unclog the throttle hole inside the servo mechanism
Komatsu excavator maintenance
【4】 After using the Komatsu excavator for a period of time, many Komatsu excavator operators have encountered the fault of "the excavator cannot move during use (only one side cannot move)"
Cause:
1. Poor operation of the oil replenishment valve in the main control valve.
2. The safety valve of the walking motor is malfunctioning.
3. Poor terminal transmission.
4. The walking motor is damaged.
Solution:
1. Check and repair the oil replenishment valve
2. Check and repair the safety valve of the walking motor
3. Maintenance and adjustment of terminal drive
4. Check and repair the walking motor
Komatsu excavator maintenance
【5】 After using the Komatsu excavator for a period of time, many Komatsu excavator operators have reported a malfunction of "weak walking (or slow speed)".
Cause:
(I) The CO valve is malfunctioning.
(2) The CO cancellation solenoid valve has a malfunction.
(3) The set pressure of the main overflow valve decreases.
(4) The 2nd level overflow solenoid valve is faulty.
Solution:
1. Maintenance of CO valve
2. Cancel the solenoid valve for CO maintenance
3. Check if the set pressure of the main overflow valve has decreased
4. Repair the 2nd level overflow solenoid valve
Repair steps for engine overheating of Komatsu excavator
Once the connector of the thermal sensor (oil) is removed, does the alarm light turn off
Addendum: If it goes out, the thermal sensor (oil) is defective and needs to be repaired or replaced
Further check if the alarm light has turned off after removing the connector of CN23
Addendum: If it goes out, the wiring WY between the CN23 thermal switches will be short circuited and the wiring WY needs to be repaired
Further check if the alarm light has turned off after removing the connector of CN14. If it has not turned off, the monitor dashboard is defective and needs to be replaced
Addendum: If it goes out, the wiring WY between CN23 and CN14 will be broken and the wiring WY needs to be repaired
