How to Fix Kobelco 8 Series 8-Bank Solenoid Valve Alarm | D Code & F Code Troubleshooting
Overview
This article shows you the full step-by-step troubleshooting for Kobelco 8-series excavator 8-bank solenoid valve alarms, including D023, D033, D013, D063, F013, F033, F023-code faults. You will learn how to identify solenoid positions, test resistance, swap plugs to locate faults, check voltage, and repair wiring by flying wire method.
1. Solenoid Positions & Fault Code Types
The 8-bank solenoid valve group includes ON-OFF solenoids and proportional solenoids. Different fault codes correspond to different valves.
F-code alarms: Front 4 solenoids (ON-OFF type)
D-code alarms: Rear 4 solenoids (Proportional type) — most common: D023, D033
Solenoid Valve Fault Codes and Corresponding Diagram
2. Standard Resistance Values (Must-Know for Testing)
Measure the solenoid valve resistance with a multimeter. Below are the standard parameters for the Kobelco Type 8.
ON-OFF Solenoids (F-code)
Normal resistance: ≈32 Ω
Rotation brake solenoid is NOT interchangeable
Other 3 ON-OFF solenoids are interchangeable
Proportional Solenoid Valve (D-code)
Normal resistance: ≈17 Ω
First 3 proportional solenoids are interchangeable
8th (arm 2-speed) is NOT interchangeable
3. Step-by-Step Troubleshooting for D023 / D033 Alarm
Step 1: Swap Plugs to Check Solenoid Valve Body
The fastest way to confirm if the solenoid is bad:
Unplug the connector of D023 solenoid
Plug it into another normal proportional solenoid (e.g. D033)
If alarm moves to D033 → solenoid is broken
If alarm stays D023 → wiring or ECU issue
Step 2: Voltage Test for Wiring
Safety lock solenoid: should have 24V
Other F-type solenoids: no 24V when unplugged (normal)
Step 3: Flying Wire Repair for Hidden Wiring Damage
8-bank solenoid wires connect to ECU Plug 5 (from left).
If the harness is damaged inside, use flying wire to reconnect from ECU pin directly to solenoid terminal.
4. Conclusion
If alarm moves after swapping → replace solenoid valve
If voltage abnormal → repair wiring or fly wire
If all normal but alarm still exists → check ECU
Quality Kobelco Solenoid Valves We Supply
We provide high-quality Kobelco 8-bank solenoid valve assemblies, plugs, and wiring harnesses for SK200-8, SK210-8, SK250-8, SK260-10.
