What is Liebherr General Fault Code E513?

Fault Code E513 indicates a malfunction in the hydraulic oil temperature sensor circuit or an abnormal hydraulic oil temperature reading outside the manufacturer's specified parameters. This code is triggered when the Electronic Control Unit (ECU) detects either an implausible signal from the hydraulic oil temperature sensor, an open circuit, a short circuit, or when the hydraulic oil temperature exceeds safe operating limits.

In Liebherr excavators, the hydraulic oil temperature sensor plays a critical role in protecting the hydraulic system from thermal damage. The ECU continuously monitors hydraulic fluid temperature to prevent overheating, which can cause accelerated component wear, seal degradation, and catastrophic hydraulic system failure. When E513 activates, the machine may enter a derated mode to protect hydraulic components, significantly impacting productivity and operational efficiency.

Common Symptoms

• Warning light illuminated on the instrument cluster, often accompanied by an audible alarm
• Reduced hydraulic performance, including slower cycle times and diminished lifting capacity
• Automatic engine derate or shutdown if the system detects critically high temperatures
• Erratic temperature gauge readings or gauge displaying abnormal values (extremely high or low)
• Hydraulic system overheating during normal operations, particularly noticeable during heavy workloads

Potential Causes

The most common technical causes for E513 in used Liebherr excavators include:

• Faulty hydraulic oil temperature sensor due to internal element failure or contamination exposure
• Damaged wiring harness or connectors, particularly at known rub points near the hydraulic tank or along the chassis frame
• Corroded or loose electrical connections at the sensor connector, common in machines operating in harsh environments
• Actual hydraulic system overheating caused by clogged hydraulic oil cooler, low oil level, or contaminated hydraulic fluid
• ECU software glitches or calibration issues requiring parameter reset or software update
• Shorted sensor wiring due to harness chafing against sharp edges or heat exposure

How to Troubleshoot and Fix Code E513

Step 1: Visual Inspection Begin with a thorough visual examination of the hydraulic oil temperature sensor located on or near the hydraulic reservoir. Check for physical damage, oil contamination on the connector, and corrosion. On used excavators, pay special attention to harness routing and potential wear points where cables contact metal surfaces.

Step 2: Electrical Testing Using a digital multimeter, check the sensor's resistance at various temperatures. Disconnect the sensor connector and measure resistance across the sensor terminals. Compare readings against Liebherr's specifications (typically 2,000-3,000 ohms at 20°C, decreasing as temperature rises). Test for continuity in the wiring harness from sensor to ECU, and check for shorts to ground.

Step 3: Verify Actual Hydraulic Temperature Use an infrared thermometer to measure actual hydraulic oil temperature at the reservoir. Compare this reading with the displayed value on the monitor. A significant discrepancy confirms sensor failure rather than actual overheating.

Step 4: Check Hydraulic System Health Inspect the hydraulic oil cooler for blockages, verify proper cooling fan operation, and check hydraulic oil level and condition. Contaminated or low oil can cause genuine overheating that triggers E513.

Step 5: Advanced Diagnostics Connect Liebherr diagnostic software (LiDat) to read live sensor data, freeze frame information, and perform active tests. Clear the code after repairs and monitor for recurrence during a test cycle.

For used excavators, always inspect connector seals and apply dielectric grease to prevent moisture intrusion, a common issue in older machines.

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Disclaimer: This guide provides general troubleshooting information. Always consult the official Liebherr service manual for your specific model and consider professional diagnostic services for complex electrical or hydraulic issues.