Sumitomo SH260LC-6 Fault Code 560: Complete Diagnostic Guide

What is Sumitomo SH260LC-6 Fault Code 560?

Fault Code 560 on the Sumitomo SH260LC-6 excavator indicates a malfunction in the hydraulic pump control system, specifically related to the pump discharge pressure sensor circuit or abnormal pressure readings. This code is triggered when the Electronic Control Module (ECM) detects voltage irregularities, sensor signal loss, or pressure values outside the manufacturer's specified operating range.

This fault is critical for the SH260LC-6 because the hydraulic pump control system directly governs the machine's digging force, swing speed, and overall hydraulic efficiency. When this sensor fails or provides incorrect data, the ECM cannot properly regulate pump output, leading to reduced performance and potential component damage. In used excavators, this code often signals wear-related issues in the hydraulic monitoring system that require immediate attention.

Common Symptoms

When Code 560 is active on your Sumitomo SH260LC-6, operators typically experience:

• Warning light illumination on the instrument cluster, often accompanied by an audible alarm
• Reduced hydraulic power across all functions, with noticeably slower boom, arm, and bucket movements
• Erratic swing performance or inconsistent travel speed due to improper pump flow compensation
• Engine derating or automatic power reduction to protect hydraulic components from damage
• Intermittent loss of auxiliary hydraulic functions, such as breaker or grapple operation

Potential Causes

The most common technical reasons for Code 560 on used SH260LC-6 excavators include:

• Faulty pump discharge pressure sensor due to internal component degradation or contaminated hydraulic fluid
• Damaged wiring harness at known rub points near the main pump assembly or along the chassis frame rail
• Corroded or loose electrical connectors at the sensor plug, especially on machines exposed to moisture or saltwater environments
• Contaminated hydraulic oil causing sensor membrane fouling or inaccurate pressure readings
• ECM software glitches or memory errors requiring calibration updates
• Physical damage to sensor mounting threads causing oil leaks and signal interference

How to Troubleshoot and Fix Code 560

Step 1: Visual Inspection Begin by inspecting the pump discharge pressure sensor located on the main hydraulic pump assembly. Check for physical damage, oil leaks around the sensor base, and corrosion on the electrical connector. On used excavators, examine the wiring harness for abrasion points where it contacts the pump housing or frame—this is a common failure point on high-hour machines.

Step 2: Electrical Testing Using a digital multimeter, disconnect the sensor connector and measure resistance across the sensor terminals. Typical resistance values should range between 250-350 ohms at room temperature (consult your service manual for exact specifications). Check connector pins for corrosion or bent terminals. Measure supply voltage from the ECM—it should read approximately 5 volts DC with the key on, engine off.

Step 3: Signal Verification Connect Sumitomo diagnostic software (or compatible heavy equipment scanner) to read live pressure sensor data. Compare actual hydraulic pressure gauge readings with ECM-displayed values. A variance greater than 10% indicates sensor failure. Before replacing components on used machines, drain a hydraulic fluid sample to check for contamination—metal particles or water can cause false readings.

Step 4: Component Replacement If diagnostics confirm sensor failure, replace the pump discharge pressure sensor with OEM or equivalent parts. Apply thread sealant to prevent leaks. Clear fault codes and perform a system calibration using diagnostic software. Test all hydraulic functions under load to verify repair.

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Disclaimer: This guide provides general diagnostic information for Sumitomo SH260LC-6 excavators. Hydraulic system repairs involve high-pressure components and specialized tools. Always consult factory service manuals and consider professional assistance from certified Sumitomo technicians for complex diagnostics or if you're unfamiliar with hydraulic systems.