What is Kobelco SK140 Fault Code 06562?

Fault Code 06562 on the Kobelco SK140 excavator indicates an abnormality in the hydraulic pump control system, specifically a malfunction in the electronic control signal for the main pump swash plate angle adjustment. This code typically registers when the Electronic Control Unit (ECU) detects an irregular voltage reading or loss of communication with the pump control solenoid that regulates hydraulic flow and pressure.

This fault is critical for the SK140's performance because the main hydraulic pump is the heart of the excavator's operational capabilities. When the swash plate angle cannot be properly controlled, the machine loses the ability to modulate hydraulic power efficiently across all functions—boom, arm, bucket, and swing. On used excavators, this code often surfaces due to degraded electrical connections, worn solenoid coils, or contaminated hydraulic oil affecting the pilot pressure system that supports electronic pump control.

Common Symptoms

• Erratic or sluggish hydraulic response across multiple functions, particularly under load
• Loss of power or inability to perform simultaneous operations (e.g., boom lift while swinging)
• Warning light illuminated on the instrument cluster, sometimes accompanied by a derated engine mode
• Intermittent code appearance that clears and returns, especially when the machine warms up or operates on uneven terrain
• Unusual hydraulic pump noise or whining due to inconsistent swash plate positioning

Potential Causes

The most common technical causes for Code 06562 on used SK140 excavators include:

• Failed or failing pump control solenoid valve—internal coil burnout or mechanical sticking from contamination
• Damaged wiring harness at known rub points near the pump mounting area or along the main chassis frame
• Corroded or loose electrical connectors at the solenoid or ECU interface, particularly on machines with high hour counts or exposure to moisture
• Faulty ECU output circuit—less common but possible in excavators with previous electrical system repairs
• Contaminated hydraulic oil causing pilot pressure inconsistencies that affect electronic signal integrity
• Worn harness grommets allowing water ingress into the pump control circuit

How to Troubleshoot and Fix Code 06562

Step 1: Visual Inspection and Connection Check Begin by inspecting the pump control solenoid and its wiring harness for obvious damage, corrosion, or oil contamination. On used SK140s, check the harness routing near the hydraulic pump where it may rub against the frame. Clean all electrical connectors with contact cleaner and verify pins are not bent or corroded. This simple check resolves approximately 30% of cases on older machines.

Step 2: Electrical Testing with Multimeter Disconnect the solenoid connector and measure resistance across the solenoid coil terminals. Kobelco specifications typically call for 8-12 ohms resistance (consult your service manual for exact values). Next, check for supply voltage at the connector with the key on—you should see battery voltage (12-14V). If voltage is absent, trace the circuit back toward the ECM for opens or shorts to ground.

Step 3: Solenoid Function Test With power restored, use Kobelco diagnostic software (or compatible scan tool) to command the solenoid on and off while monitoring actual hydraulic response. If the swash plate angle does not change or the solenoid clicks weakly, replacement is necessary. For used excavators, always inspect the solenoid mounting area for metal debris or hydraulic contamination that could cause premature failure of the new component.

Step 4: Hydraulic System Verification If electrical tests pass, verify pilot pressure to the pump control system meets specifications (typically 3.5-4.5 bar). Low pilot pressure from clogged filters or worn pilot pumps can cause erratic electronic control signals. Replace the hydraulic oil filter and sample oil for contamination before condemning electrical components.

Professional Disclaimer: While these diagnostic steps are accurate for trained technicians, improper testing can damage the ECU or create safety hazards. For used excavators with complex intermittent faults, consult a certified Kobelco technician or dealer with proper diagnostic equipment to avoid unnecessary parts replacement and ensure comprehensive system analysis.