Sumitomo SH210LC-5LR Fault Code 1345: Complete Diagnostic Guide

What is Sumitomo SH210LC-5LR Fault Code 1345?

Fault Code 1345 on the Sumitomo SH210LC-5LR indicates a malfunction in the hydraulic pump control system, specifically related to the pump flow control solenoid circuit or its feedback sensor. This code triggers when the Electronic Control Module (ECM) detects an abnormal voltage signal, open circuit, or short circuit in the pump regulation system.

This fault is critical for the SH210LC-5LR because the pump flow control solenoid directly regulates hydraulic pressure and flow based on operator demand. When compromised, the excavator cannot properly modulate hydraulic power, leading to reduced operational efficiency and potential damage to the hydraulic system. The Sumitomo -5LR series relies heavily on precise electronic-hydraulic integration, making this code particularly important to address immediately.

Common Symptoms

When Code 1345 is active, operators typically experience:

• Reduced hydraulic power across all functions (boom, arm, bucket, swing)
• Erratic or sluggish machine response to joystick inputs
• Intermittent or constant warning light on the instrument cluster
• Engine automatically derating to protect the hydraulic system
• Unusual whining or cavitation noises from the main hydraulic pump

Potential Causes

The most common technical causes for Code 1345 on used SH210LC-5LR excavators include:

• Worn or failed pump flow control solenoid valve (common after 6,000+ operating hours)
• Damaged wiring harness near the pump area due to vibration and heat exposure
• Corroded or loose electrical connectors at the solenoid or ECM
• Faulty feedback position sensor on the pump regulator
• ECM internal fault or corrupted calibration data
• Low system voltage from aging batteries or failing alternator

How to Troubleshoot and Fix Code 1345

Step 1: Visual Inspection Begin by inspecting the pump flow control solenoid located on the main hydraulic pump. Check all wiring harnesses for abrasion, especially where they contact the pump housing or frame. On used excavators, look for oil contamination on connectors, which indicates seal failure. Clean all connector pins with electrical contact cleaner.

Step 2: Electrical Testing Using a digital multimeter, check solenoid resistance (typically 15-25 ohms for Sumitomo systems). Test supply voltage at the solenoid connector with ignition on (should read 12-14V). Check for short circuits between signal wires and ground. Inspect ECM connector pins for corrosion or bent terminals.

Step 3: Component Testing If electrical values are correct, perform a solenoid function test using Sumitomo's diagnostic software or compatible scan tool. Monitor real-time data for pump pressure feedback. Replace the solenoid valve if it fails to respond. For used machines, always replace the O-rings and seals when reinstalling components.

Step 4: Advanced Diagnostics If the fault persists, test the feedback sensor on the pump regulator using an oscilloscope to check signal quality. Verify ECM ground connections are clean and tight. Consider ECM reprogramming or replacement if all components test properly.

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Disclaimer: This guide provides general troubleshooting information. Always consult the official Sumitomo service manual and consider professional diagnostic assistance for complex repairs. Improper repairs can cause serious equipment damage or safety hazards.