What is Case CX220C Fault Code 7613?

Fault Code 7613 on the Case CX220C excavator indicates a Hydraulic Pump Solenoid Circuit Malfunction, specifically related to the main pump control system's electrical circuit. This diagnostic trouble code (DTC) is triggered when the Engine Control Module (ECM) detects an abnormal voltage or resistance reading in the wiring harness or solenoid that regulates hydraulic pump output.

This code is critical because the hydraulic pump solenoid directly controls the machine's hydraulic flow and pressure. On the CX220C, this system manages everything from boom and bucket speed to travel functions. When this circuit fails, the excavator's performance becomes unpredictable, potentially leading to unsafe operating conditions or complete loss of hydraulic function.

Common Symptoms

When Code 7613 is active on your Case CX220C, operators typically experience:

• Warning light illumination on the instrument cluster, often accompanied by an audible alarm
• Reduced hydraulic power across all functions (slow cycle times for boom, arm, and bucket)
• Intermittent loss of hydraulic response, particularly during warm-up or under heavy load
• Engine derate mode where RPM is automatically limited to protect the system
• Erratic hydraulic behavior such as sudden surges or drops in pressure during operation

Potential Causes

The most common technical reasons for Code 7613 on used CX220C excavators include:

• Damaged wiring harness near the hydraulic pump mounting area, where vibration and heat cause insulation breakdown
• Failed hydraulic pump solenoid due to internal coil deterioration or contamination from hydraulic fluid leaks
• Corroded or loose electrical connectors at the solenoid or ECM interface points
• Shorted or open circuits in the control wiring, especially at known rub points along the frame rail
• ECM internal fault (less common) where the control module itself has failed output circuitry
• Low system voltage from aging batteries or failing alternator affecting solenoid activation

How to Troubleshoot and Fix Code 7613

Step 1: Visual Inspection Begin by inspecting the hydraulic pump solenoid connector and wiring harness for obvious damage. On used excavators, check for oil contamination, pinched wires near mounting brackets, and corrosion on connector pins. Clean all connections with electrical contact cleaner.

Step 2: Electrical Testing Using a digital multimeter, measure resistance across the solenoid coil (typically 8-15 ohms for Case systems). Then check for supply voltage at the connector with the key on (should read 12V). Test the ground circuit for continuity to the frame.

Step 3: Harness Continuity Check Trace the wiring from the solenoid back to the ECM connector, checking for breaks or shorts to ground. Pay special attention to areas where the harness passes through bulkheads or near moving components—common failure points on machines with high operating hours.

Step 4: Component Replacement If electrical tests confirm solenoid failure, replace the hydraulic pump control solenoid with OEM or equivalent parts. For harness damage, repair or replace the affected section using proper gauge wire and weatherproof connectors designed for hydraulic system environments.

Step 5: Clear Code and Verify After repairs, use Case diagnostic software or a compatible scan tool to clear the fault code. Operate the machine through full hydraulic cycles under load to confirm proper function and ensure the code does not return.

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Disclaimer: This guide provides general troubleshooting information for Case CX220C excavators. Hydraulic and electrical system repairs should be performed by qualified technicians with proper training and equipment. Always consult the official Case service manual and follow all safety procedures when working on heavy equipment.