What is Sumitomo SH220LC-5 Fault Code 1113?

Fault Code 1113 on the Sumitomo SH220LC-5 excavator indicates a Main Pump Solenoid Valve Circuit Malfunction, specifically related to the electronic control system's inability to properly regulate hydraulic pump output. This code is triggered when the Engine Control Module (ECM) or Pump Control Unit detects an abnormal voltage, resistance, or open/short circuit condition in the solenoid valve that modulates the main hydraulic pump's swash plate angle.

This fault is critical because the main pump solenoid directly controls hydraulic flow and pressure throughout the entire machine. When this circuit malfunctions, the excavator cannot properly match hydraulic power to operator demand, resulting in reduced productivity and potential damage to the hydraulic system. On the SH220LC-5, this system uses proportional control technology that requires precise electrical signals—any degradation severely impacts machine performance.

Common Symptoms

• Erratic hydraulic response with inconsistent boom, arm, or bucket speeds regardless of joystick input
• Loss of hydraulic power or significant reduction in digging force and cycle times
• Warning light illumination on the instrument cluster, often accompanied by error code display
• Engine RPM fluctuations as the ECM attempts to compensate for improper pump control
• Complete hydraulic system failure in severe cases, rendering the machine inoperable

Potential Causes

The most common technical causes for Code 1113 on used SH220LC-5 excavators include:

• Worn or damaged solenoid valve coil within the main pump assembly, often due to heat cycling and age
• Corroded or loose electrical connectors at the pump solenoid harness connection point—a known wear area on this model
• Chafed wiring harness where cables route near the pump mounting bracket or swing bearing area
• Failed pump control module or ECM internal driver circuit providing incorrect voltage output
• Contaminated hydraulic oil causing mechanical sticking of the solenoid spool, creating electrical feedback issues
• Voltage supply problems from the main power harness, often traced to battery or alternator degradation in older machines

How to Troubleshoot and Fix Code 1113

Step 1: Initial Electrical Inspection Begin by disconnecting the solenoid valve connector at the main pump. Inspect for corrosion, bent pins, or moisture intrusion—common in used excavators operating in harsh environments. Clean connections with electrical contact cleaner and examine the wiring harness along its entire route for abrasion points, particularly where it passes through metal brackets.

Step 2: Resistance and Voltage Testing Using a digital multimeter, measure the solenoid coil resistance at the pump-side connector. Typical specifications for the SH220LC-5 range between 8-15 ohms (consult your service manual for exact values). Next, check for supply voltage at the harness connector with the ignition on—you should see approximately 12-24V DC depending on system design. Any deviation indicates harness or ECM issues.

Step 3: Functional Testing and Component Replacement With the engine running, use Sumitomo diagnostic software (or compatible scan tool) to command the solenoid valve through its range while monitoring current draw. Normal operation shows smooth amperage changes between 0.5-2.0 amps. If resistance and voltage are correct but the code persists, the solenoid valve itself requires replacement. For used excavators, always inspect the hydraulic oil filter for metal contamination before reinstalling—internal pump wear can cause secondary solenoid failure.

Step 4: Post-Repair Verification After repairs, clear fault codes, run the machine through full hydraulic cycles, and monitor for code recurrence. Check all mounting bolts on the pump assembly, as vibration from loose hardware can cause intermittent electrical connections.

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Disclaimer: This guide provides general troubleshooting information. Always consult the official Sumitomo service manual for your specific machine serial number and seek assistance from certified heavy equipment technicians for complex electrical or hydraulic repairs. Improper diagnosis can lead to costly component damage.