Kobelco SK-8 Excavator Solenoid Valve Locations, Interchanging Rules & Fault Codes Guide
When Kobelco excavators trigger D-series or E-series alarm codes (such as D012 or E013), it usually points to a solenoid valve or proportional valve issue. While troubleshooting methods are known, technicians often struggle to locate specific valves or identify which ones are interchangeable across different tonnage models (SK60-8, SK75-8, SK130-8/140-8, and 20-40T). This guide solves all these challenges completely.
1. General Solenoid Valve Troubleshooting Methods
Cross-Testing: Locate the suspect solenoid valve and swap its connector with an adjacent interchangeable valve. If the original alarm disappears and a different fault code appears, the solenoid valve itself is faulty.
Wiring Inspection: Besides valve hardware failure, harness issues are common. Since there are adapter connectors between the wiring harness and the computer board (controller), inspect the wiring harness thoroughly.
2. Solenoid Valve Core Definitions & Functions
| Code | Valve Name (EN / CN) | Core Function / Working Principle |
|---|---|---|
| SV-4 | Safety Lock Solenoid Valve | When the safety lock lever is lowered, the safety lock solenoid valve is energized. Once switched, the pilot oil circuit is connected. |
| SV-1 | Swing Brake Solenoid Valve | De-energized during swing operation; valve spool remains unshifted, allowing pilot oil to reach the travel motor brake piston to release the brake. |
| SV-3 | Travel 1/2 Speed Solenoid Valve | Responsible for switching between 1st (turtle) and 2nd (rabbit) travel speeds. |
| SV-2 | Work Device Boost Solenoid Valve | Provides work device power boost to enhance digging force. |
| PSV-B | P2 Unloading Proportional Valve | Controls the opening status of the P2 unloading spool, returning unused pressurized oil to the hydraulic tank and eliminating residual pressure. |
| PSV-C | Travel Straight Proportional Valve | Maintains travel straightness during combined multi-operation movements. |
| PSV-D | P1 Unloading Proportional Valve | Controls the opening status of the P1 unloading spool, returning unused pressurized oil to the tank to eliminate residual pressure. |
| PSV-A | Arm 2-Speed Proportional Valve | Accelerates arm speed during arm retraction operations. |
3. Solenoid Valve Locations & Interchangeability by Model
Kobelco SK60-8
Kobelco SK60-8 features a total of 2 solenoid valves: the Safety Lock Solenoid Valve and the Travel 1/2 Speed Solenoid Valve (Part Number:
PY35V00009S007). Both valves are fully interchangeable with each other.
Kobelco SK75-8
Kobelco SK75-8 is equipped with 3 solenoid valves: SV-4 Safety Lock, SV-3 Travel 1/2 Speed, and SV-1 Swing Brake Solenoid Valve (
YN35V00051F1). In this setup, SV-3 and SV-4 (YN35V00050F1) can be swapped with each other.
Kobelco SK130-8 & SK140-8
Kobelco SK130-8 and SK140-8 feature 7 solenoid/proportional valves. Among them, SV-3 and SV-4 (
YN35V00050F1) are interchangeable. Proportional valves PSV-B, PSV-C, and PSV-D (YN35V00048F1) can be swapped with one another, while PSV-A uses part number (YN35V00049F1).
Kobelco 8-Series 20–40 Ton Excavators
Kobelco 20-40T excavators feature 8 solenoid valves. Valves SV-2, SV-3, and SV-4 (
YN35V00050F1) are interchangeable with each other. Proportional valves PSV-B, PSV-C, and PSV-D (YN35V00048F1) can be swapped, and PSV-A uses YN35V00049F1.
4. Common Fault Codes & Troubleshooting Guide
D-Series Fault Codes (Proportional Valve / Transistor Faults)
| Fault Code | Fault Content (EN / CN) | Associated Valve | Standard Troubleshooting Steps |
|---|---|---|---|
| D012 / D013 | P1 Loading / Unloading Proportional Valve Transistor ON Fault | PSV-D (P1 Unloading) | 1. Swap connector with another proportional valve; if fault transfers, replace valve. 2. If fault remains, inspect wiring harness. 3. Replace controller if wiring is normal. |
| D022 / D023 | P2 Unloading Proportional Valve Transistor ON / Disconnection | PSV-B (P2 Unloading) | Same 3-step troubleshooting logic as above. |
| D032 / D033 | Straight Travel Proportional Valve Transistor ON / Disconnection | PSV-C (Travel Straight) | 1. Swap connector test. 2. Inspect sensor / proportional valve. 3. Replace components or controller. |
| D062 / D063 | Arm Retract 2-Speed Proportional Valve Faults | PSV-A (Arm 2-Speed) | 1. Cross-test connectors. 2. Check wiring harness. 3. Check computer board. |
E-Series Fault Codes (Pump Proportional Valve Faults)
| Fault Code | Fault Content (EN / CN) | Associated Valve | Standard Troubleshooting Steps |
|---|---|---|---|
| E012 / E013 | P1 Pump Proportional Valve Transistor ON Fault | P1 Pump Proportional Valve | 1. Power off, swap connectors. 2. Inspect proportional valve. 3. Inspect wiring harness, then controller . |
| E022 / E023 | P2 Pump Proportional Valve Transistor ON / Disconnection | P2 Pump Proportional Valve | Same workflow as E012/E013. |
F-Series Fault Codes (Solenoid Valve Ground Short / Open Circuit)
| Fault Code | Fault Content (EN / CN) | Associated Valve | Standard Troubleshooting Steps |
|---|---|---|---|
| F011 / F013 | ATT Boost Solenoid Valve Ground Short / Transistor ON Fault | SV-2 (Work Device Boost) | 1. Power off, cross-test connectors. 2. Inspect solenoid valve and harness for ground friction/water. 3. Replace controller if wiring is normal. |
| F021 / F023 | Swing Parking Solenoid Valve Ground Short / Disconnection | SV-1 (Swing Brake) | Same workflow as above. |
| F041 / F043 | Selection Solenoid Valve Ground Short / Disconnection | Selection Solenoid Valve | Same workflow as above. |
