Sumitomo SH220LC-6 Fault Code 7613: Complete Diagnostic Guide

What is Sumitomo SH220LC-6 Fault Code 7613?

Fault Code 7613 on the Sumitomo SH220LC-6 indicates a hydraulic pump delivery pressure sensor malfunction or abnormal signal voltage in the main hydraulic system. This code is triggered when the Electronic Control Module (ECM) detects a voltage reading outside the normal operating range (typically 0.5-4.5V) from the pump pressure sensor circuit.

This fault is critical for the SH220LC-6 because the hydraulic pump pressure sensor provides real-time feedback to the controller, enabling proper load-sensing and flow control. When this sensor fails or sends erratic signals, the machine cannot optimize hydraulic performance, potentially leading to reduced digging force, slower cycle times, and increased fuel consumption. The Sumitomo SH220LC-6's advanced load-sensing hydraulic system relies heavily on accurate pressure data to maintain efficiency and prevent component damage.

Common Symptoms

When Code 7613 is active, operators typically experience:

• Hydraulic system derate with noticeably reduced boom, arm, or bucket speed
• Warning light illumination on the instrument cluster (often a hydraulic system icon)
• Erratic hydraulic response or inconsistent control during multi-function operations
• Engine RPM fluctuations under load as the ECM attempts to compensate for incorrect pressure readings
• Intermittent fault logging that may clear and return, especially during warm-up or under heavy load conditions

Potential Causes

The most common technical causes for Code 7613 on used SH220LC-6 excavators include:

• Pressure sensor internal failure due to age, contamination, or hydraulic fluid degradation (common after 8,000+ hours)
• Wiring harness damage at the sensor connector or along the routing path near the hydraulic pump mounting area where vibration and heat exposure occur
• Corroded or loose connector pins at the sensor or ECM interface, particularly on machines operated in wet or coastal environments
• ECM power supply issues affecting the 5V reference voltage to the sensor circuit
• Hydraulic oil contamination causing sensor diaphragm damage or blocked pressure ports

How to Troubleshoot and Fix Code 7613

Step 1: Visual Inspection Begin by inspecting the pump pressure sensor (located on the main hydraulic pump assembly). Check the wiring harness for abrasion, cuts, or heat damage along its routing path. On used excavators, pay special attention to harness contact points where the wires pass near metal brackets or the engine block—these are common rub-through locations on the SH220LC-6.

Step 2: Electrical Testing Using a digital multimeter, backprobe the sensor connector (engine running) and verify the 5V reference voltage from the ECM. Measure the sensor signal output voltage at idle and under load—it should range between 0.5V (low pressure) and 4.5V (high pressure). Check circuit resistance with the sensor disconnected; it should read between 250-350 ohms depending on temperature.

Step 3: Sensor and Connector Service Disconnect the sensor and inspect the connector pins for corrosion or bent contacts. Clean with electrical contact cleaner and apply dielectric grease. If voltage readings are correct but the code persists, replace the pressure sensor with an OEM or quality aftermarket unit. After replacement, clear codes using Sumitomo diagnostic software or a compatible J1939 scanner and perform a pressure calibration procedure.

Step 4: Hydraulic System Verification Before finalizing repairs, check hydraulic oil condition and filter status. Contaminated oil can damage new sensors. Verify actual system pressure using a mechanical pressure gauge to ensure the hydraulic pump is generating proper pressure (typically 320-350 bar at relief).

---

Disclaimer: This guide provides general diagnostic procedures for Code 7613. Hydraulic system repairs involve high-pressure components and electrical diagnostics requiring specialized tools. Always consult the Sumitomo service manual for your specific serial number and consider professional assistance for complex repairs.