What is Sumitomo SH240-6 Fault Code 560?

Fault Code 560 on the Sumitomo SH240-6 excavator indicates a hydraulic pump displacement sensor malfunction or signal error. This code is triggered when the Electronic Control Unit (ECU) detects an abnormal voltage signal from the pump displacement feedback sensor, which monitors the angle of the swash plate in the variable displacement hydraulic pump.

This sensor is critical for the SH240-6's load-sensing hydraulic system. The ECU uses this feedback to optimize pump output, fuel efficiency, and overall machine performance. When Code 560 appears, the machine may enter a protective derate mode to prevent damage to the hydraulic system or engine, significantly impacting productivity on the jobsite.

Common Symptoms

When Code 560 is active on your Sumitomo SH240-6, operators typically experience:

• Warning light illuminated on the instrument cluster, often accompanied by an audible alarm
• Reduced hydraulic power or sluggish boom, arm, and bucket movements
• Engine RPM limitations as the ECU restricts power to protect the hydraulic system
• Erratic hydraulic response during multi-function operations (e.g., simultaneous boom and swing)
• Intermittent code logging that may clear and reappear, especially during cold starts or high-load conditions

Potential Causes

Several technical issues commonly trigger Code 560 on used SH240-6 excavators:

• Worn or damaged pump displacement sensor due to age, vibration, or hydraulic fluid contamination
• Corroded or loose electrical connectors at the sensor harness connection point on the main pump
• Wiring harness damage from rubbing against the pump housing or frame rails—a known issue on high-hour machines
• ECU voltage supply issues, including poor ground connections or damaged power supply circuits
• Contaminated hydraulic fluid causing sensor fouling or mechanical interference with the swash plate mechanism
• Failed ECU internal circuitry (less common but possible on excavators with 8,000+ operating hours)

How to Troubleshoot and Fix Code 560

Step 1: Visual Inspection Start by accessing the main hydraulic pump (located behind the engine). Inspect the displacement sensor connector for corrosion, bent pins, or hydraulic oil contamination. On used excavators, check the entire wiring harness for wear points where it contacts metal surfaces—apply dielectric grease to cleaned connections.

Step 2: Electrical Testing Using a digital multimeter, measure the sensor's supply voltage (should be 5V ±0.25V with key on, engine off). Check sensor output voltage while manually moving the swash plate (if accessible)—typical range is 0.5-4.5V. Measure harness resistance from sensor connector to ECU; readings above 5 ohms indicate damaged wiring.

Step 3: Component Testing and Replacement If voltage readings are correct but the code persists, test the sensor's resistance (typically 1-3kΩ depending on specification). Replace the sensor if out of range. For used machines, always replace the connector pigtail simultaneously, as corrosion often damages connector terminals internally.

Step 4: System Verification Clear codes using Sumitomo diagnostic software (or compatible tools like Jaltest). Perform a calibration procedure and operate the machine under load for 20-30 minutes to verify the repair.

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Disclaimer: This guide provides general troubleshooting information. Always consult the official Sumitomo service manual for your specific serial number and consider professional diagnostic assistance for complex electrical or hydraulic system repairs.