Sumitomo SH220LC-6 Fault Code 7200: Complete Diagnostic Guide

What is Sumitomo SH220LC-6 Fault Code 7200?

Fault Code 7200 on the Sumitomo SH220LC-6 indicates a hydraulic pump pressure sensor circuit malfunction or abnormal pressure reading detected by the machine's Electronic Control Module (ECM). This code specifically relates to the main hydraulic pump's pressure monitoring system, which is critical for maintaining optimal hydraulic performance and protecting the pump from damage.

The pressure sensor continuously monitors hydraulic system pressure and sends voltage signals to the ECM. When the ECM detects voltage readings outside the normal range (typically 0.5-4.5V) or identifies pressure values inconsistent with engine load and pump displacement, it triggers Code 7200. This is particularly critical on the SH220LC-6 because the hydraulic system operates at pressures up to 350 bar (5,075 psi), and any monitoring failure can lead to catastrophic pump damage or reduced machine efficiency.

Common Symptoms

When Code 7200 is active, operators typically experience:

• Warning light illuminated on the instrument cluster with reduced hydraulic power
• Sluggish or inconsistent boom, arm, and bucket movements
• Automatic derate of engine RPM to protect hydraulic components
• Erratic pressure gauge readings on the dashboard display
• Intermittent loss of hydraulic functions during operation, especially under heavy loads

Potential Causes

The most common technical causes for Code 7200 on used SH220LC-6 excavators include:

• Failed hydraulic pressure sensor due to internal diaphragm wear or electrical component degradation (common after 8,000+ hours)
• Damaged wiring harness near the main pump mounting area where vibration causes wire chafing
• Corroded or loose connector pins at the sensor plug, especially on machines operating in wet or coastal environments
• ECM communication issues caused by poor ground connections at the controller mounting bracket
• Actual hydraulic pressure problems including worn pump components, contaminated hydraulic oil, or relief valve malfunction

How to Troubleshoot and Fix Code 7200

Step 1: Visual Inspection Begin by locating the hydraulic pressure sensor mounted on the main pump assembly (left side of the pump housing). Inspect the electrical connector for corrosion, bent pins, or oil contamination. On used excavators, check the wiring harness routing for signs of rubbing against the pump case or engine block—a common wear point on this model.

Step 2: Electrical Testing Disconnect the sensor and use a digital multimeter to check sensor resistance. The pressure sensor should read approximately 250-350 ohms at room temperature. Next, check the supply voltage at the harness connector with the key on, engine off—you should see 5V reference voltage from the ECM. If voltage is absent or incorrect, trace the harness back to the ECM for breaks or shorts.

Step 3: Sensor Signal Testing Reconnect the sensor and backprobe the signal wire while starting the engine. The signal voltage should range from 0.8V at idle to 3.5-4.2V under load. Erratic readings or values stuck at 0V or 5V indicate sensor failure. For used machines, consider testing hydraulic pressure with a mechanical gauge (install at test port) to verify actual system pressure matches sensor readings.

Step 4: Component Replacement If testing confirms sensor failure, replace with a genuine Sumitomo pressure sensor (Part #KRC0285). Before installation on used equipment, clean the mounting threads, apply anti-seize compound, and torque to 25-30 Nm. Replace the connector pigtail if corrosion is evident. After replacement, clear codes using diagnostic software and perform a function test under load.

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Disclaimer: This guide provides general troubleshooting information. Hydraulic systems operate under extreme pressure and require proper safety procedures. Always consult the official Sumitomo service manual and consider professional diagnosis for complex issues, especially on high-hour used machines.