When KOBELCO excavator displays error codes starting with D and E, such as D012 and E013, they are a solenoid valve problem. Knowing the troubleshooting method, but not knowing the location of the solenoid valve and which solenoid valves are interchangeable, many friends who encounter this kind of problem are at a loss. Today, we will solve all these troubles for you.
1. Locations of Solenoid Valves on KOBELCO Excavators
1.1 SK60
SK60 has a total of two solenoid valves, namely the safety lock solenoid valve and the travel 1, 2 speed solenoid valves. The two are interchangeable.
1.2 SK75
SK75 has three proportional solenoid valves, namely SV-4 safety lock solenoid valve, SV-3 travel 1, 2 speed solenoid valve and SV-1 swing brake solenoid valve. SV-3 in the picture above can be interchanged with SV-4.
1.3 SK130&140
SK130 and SK140 have a total of 7 solenoid valves. The two solenoid valves SV-3 and SV-4 in the picture above are interchangeable and the three proportional solenoid valves PSV-B, PSV-C, and PSV-D are interchangeable.
1.4 20T-40T
The 20T-40T excavator has 8 solenoid valves. The three solenoid valves SV-2, SV-3 and SV-4 in the picture above are interchangeable. The three solenoid proportional valves PSV-B, PSV-C and PSV-D are interchangeable.
2. Functions of Solenoid Valves on KOBELCO Excavators
SV-4: Safety Lock Solenoid Valve
Function: When the locking lever is lowered, the safety lock solenoid valve is in the energized state, and the pilot oil passage is connected after the solenoid valve is switched.
SV-1: Swing Brake Solenoid Valve
Function: The swing solenoid valve is powered off when operating the rotation, the valve core does not switch, and the pilot oil passages through the rotary motor to the brake piston to release the brake.
SV-3: Travel 1, 2 Speed Solenoid Valve
Function: Responsible for travel speed switching between 1 and 2 speed.
SV-2: Booster Solenoid Valve
Function: The excavator has a pressure booster device to improve excavation strength.
PSV-B: P2 Unloading Proportional Valve
Function: This valve controls the opening state of the P2 unloading spool, so that the pressure oil that has not participated in the work of the hydraulic system returns to the hydraulic oil tank, eliminating the residual pressure of each actuator.
PSV-C: Straight Travel Proportional Valve
Function: When the excavator performs compound action operations, this valve keeps its travel straight.
PSV-D: P1 Unloading Proportional Valve
Function: This valve controls the opening state of the P1 unloading spool, allowing the pressure oil that has not participated in the work of the hydraulic system to return to the hydraulic oil tank, eliminating the residual pressure of each actuator.
PSV-A: 2 Speed Inverse Proportional Valve
Function: When the small arm performs a retraction action, this valve accelerates its retraction speed.
3. Common Error Codes and Troubleshooting for Solenoid Valves of KOBELCO Excavators
KOBELCO excavator solenoid valve troubleshooting methods:
▊Find the position of the solenoid valve and swap it with the interchangeable solenoid valve next to it. If the error code disappears and others are generated, this solenoid valve may be faulty.
▊In addition to the failure of the solenoid valve itself, when an error code appears, there may also be a solenoid valve wiring problem. There is an adapter between the wiring and the computer board, and service personnel are required to check the wiring harness.
3.1 Fault Code D012
Fault content: P1 loading proportional valve output transistor ON fault
Solutions:
1. If D012 disappears and other errors occur after the connector of the valve is exchanged with other proportional valves’, check the sensor. If abnormal, replace it.
2. Even if its connector is interchanged with other proportional valves’, D012 will continue to display. Check and repair according to the wiring inspection instructions.
3. Replace the computer board and confirm whether the abnormality disappears.
3.2 Fault Code D013
Fault content: P1 unloading proportional valve output transistor ON fault
Solutions:
1. If D013 disappears and other errors occur after the connector of the valve is exchanged with other proportional valves’, check the sensor. If abnormal, replace it.
2. Even if its connector is interchanged with other proportional valves’, D013 will continue to display. Check and repair according to the wiring inspection instructions.
3. Replace the computer board and confirm whether the abnormality disappears.
3.3 Fault Code D022
Fault content: P2 unloading proportional valve output transistor ON fault
Solutions:
1. If D022 disappears and other errors occur after the connector of the valve is exchanged with other proportional valves’, check the proportional valve. If abnormal, replace it.
2. Even if its connector is interchanged with other proportional valves’, D022 will continue to display. Check and repair according to the wiring inspection instructions.
3. Replace the computer board and confirm whether the abnormality disappears.
3.4 Fault Code D023
Fault content: P2 unloading proportional valve disconnected
Solutions:
1. If D023 disappears and other errors occur after the connector of the valve is exchanged with other proportional valves’, check the proportional valve. If abnormal, replace it.
2. Even if its connector is interchanged with other proportional valves’, D023 will continue to display. Check and repair according to the wiring inspection instructions.
3. Replace the computer board and confirm whether the abnormality disappears.
3.5 Fault Code D032
Fault content: Straight travel proportional valve output transistor ON fault
Solutions:
If D032 disappears and other errors occur when the connector of the straight travel proportional valve PSV-C is swapped with those of other proportional valves, check the sensor and replace it if abnormal.
3.6 Fault Code D033
Fault content: Straight travel proportional valve disconnected
Solutions:
If D033 disappears and other errors occur when the connector of the straight travel proportional valve PSV-C is swapped with those of other proportional valves, check the sensor and replace it if abnormal.
3.7 Fault Code D062
Fault content: Arm retraction 2 speed proportional valve output transistor ON is disconnected
Solutions:
1. If D062 disappears and other errors occur after the connector of the valve is exchanged with other proportional valves’, check the proportional valve. If abnormal, replace it.
2. Even if its connector is interchanged with other proportional valves’, D062 will continue to display. Check and repair according to the wiring inspection instructions.
3. Replace the computer board and confirm whether the abnormality disappears.
3.8 Fault Code D063
Fault content: Arm retraction 2 speed proportional valve disconnected
Solutions:
1. If D063 disappears and other errors occur after the connector of the valve is exchanged with other proportional valves’, check the proportional valve. If abnormal, replace it.
2. Even if its connector is interchanged with other proportional valves’, D063 will continue to display. Check and repair according to the wiring inspection instructions.
3. Replace the computer board and confirm whether the abnormality disappears.
3.9 Fault Code E012
Fault content: P1 pump proportional valve output transistor ON fault
Solutions:
1. If E012 disappears and other errors occur after the connector of the valve is exchanged with other proportional valves’, check the proportional valve. If abnormal, replace it. When exchanging connectors, temporarily turn off the power.
2. Even if its connector is interchanged with other proportional valves’, E012 will continue to display. Check and repair according to the wiring inspection instructions.
3. Replace the computer board and confirm whether the abnormality disappears.
3.10 Fault Code E013
Fault content: P1 pump proportional valve output transistor ON fault
Solutions:
1. If E013 disappears and other errors occur after the connector of the valve is exchanged with other proportional valves’, check the proportional valve. If abnormal, replace it. When exchanging connectors, temporarily turn off the power.
2. Even if its connector is interchanged with other proportional valves’, E013 will continue to display. Check and repair according to the wiring inspection instructions.
3. Replace the computer board and confirm whether the abnormality disappears.
3.11 Fault Code E022
Fault content: P2 pump proportional valve output transistor ON fault
Solutions:
1. If E022 disappears and other errors occur after the connector of the valve is exchanged with other proportional valves’, check the proportional valve. If abnormal, replace it. When exchanging connectors, temporarily turn off the power.
2. Even if its connector is interchanged with other proportional valves’, E022 will continue to display. Check and repair according to the wiring inspection instructions.
3. Replace the computer board and confirm whether the abnormality disappears.
3.12 Fault Code E023
Fault content: P2 pump proportional valve disconnected
Solutions:
1. If E023 disappears and other errors occur after the connector of the valve is exchanged with other proportional valves’, check the proportional valve. If abnormal, replace it. When exchanging connectors, temporarily turn off the power.
2. Even if its connector is interchanged with other proportional valves’, E023 will continue to display. Check and repair according to the wiring inspection instructions.
3. Replace the computer board and confirm whether the abnormality disappears.
3.13 Fault Code F011
Fault content: ATT boost solenoid valve output transistor OFF fault, short circuit to ground
Solutions:
1. If F011 disappears and other errors occur after the connector of the valve is exchanged with other solenoid valves’, check the solenoid valve.
2. Even if its connector is interchanged with other proportional valves’, F011 will continue to display. Check and repair according to the wiring inspection instructions.
3. Replace the computer board and confirm whether the abnormality disappears.
3.14 Fault Code F013
Fault content: ATT boost solenoid valve output transistor ON fault, short circuit to ground
Solutions:
1. If F013 disappears and other errors occur after the connector of the valve is exchanged with other solenoid valves’, check the solenoid valve.
2. Even if its connector is interchanged with other proportional valves’, F013 will continue to display. Check and repair according to the wiring inspection instructions.
3. Replace the computer board and confirm whether the abnormality disappears.
3.15 Fault Code F021
Fault content: Swing brake solenoid valve output transistor OFF fault, short circuit to ground
Solutions:
1. If the connector of the valve is exchanged with other solenoid valves’, F021 disappears, and other errors occur, check the solenoid valve, and replace it if abnormal.
2. If F021 continues to display even if its connector is interchanged with other proportional valves’, check and repair according to the wiring inspection instructions.
3. Replace the computer board and confirm whether the abnormality disappears.
3.16 Fault Code F023
Fault content: Swing brake solenoid valve output transistor ON fault, disconnection
Solutions:
1. If the connector of the valve is exchanged with other solenoid valves’, F023 disappears, and other errors occur, check the solenoid valve, and replace it if abnormal.
2. If F023 continues to display even if its connector is interchanged with other proportional valves’, check and repair according to the wiring inspection instructions.
3. Replace the computer board and confirm whether the abnormality disappears.
3.17 Fault Code F041
Fault content: Optional solenoid valve output transistor OFF fault, short circuit to ground
Solutions:
1. If the connector of the valve is exchanged with other solenoid valves’, F041 disappears, and other errors occur, check the solenoid valve, and replace it if abnormal.
2. If F041 continues to display even if its connector is interchanged with other proportional valves’, check and repair according to the wiring inspection instructions.
3. Replace the computer board and confirm whether the abnormality disappears.
3.18 Fault Code F043
Fault content: Optional solenoid valve output transistor ON fault, disconnection
Solutions:
1. If the connector of the valve is exchanged with other solenoid valves’, F043 disappears and other errors occur, check the solenoid valve. If abnormal, replace it.
2. If F043 continues to display even if the connector of the solenoid valve is changed, check and repair according to the wiring inspection instructions.
3. Replace the computer board and confirm whether the abnormality disappears.
