What is Sany Excavator Fault Code P260?

Fault Code P260 indicates a malfunction in the hydraulic pump solenoid circuit or pressure control system. This diagnostic trouble code (DTC) is triggered when the Electronic Control Module (ECM) detects an abnormal voltage, open circuit, or short circuit in the hydraulic pump's proportional solenoid valve wiring or control system.

In Sany excavators, the hydraulic pump solenoid regulates system pressure and flow based on operator demand and engine load. When Code P260 activates, the ECM cannot properly modulate hydraulic output, potentially causing the machine to enter a derate mode or limit hydraulic functions. This is critical because compromised hydraulic control directly affects digging force, swing speed, and overall machine productivity—especially problematic in used equipment where electrical components may have degraded over time.

Common Symptoms

• Reduced hydraulic power or sluggish boom/arm movements during operation
• Warning light illumination on the instrument cluster, often accompanied by an audible alarm
• Erratic hydraulic response where functions work intermittently or fail to respond smoothly
• Engine derating or automatic reduction in RPM to protect the hydraulic system
• Error messages displayed on the machine's monitor indicating hydraulic system faults

Potential Causes

The most common technical reasons for Code P260 in used Sany excavators include:

• Faulty hydraulic pump solenoid valve due to internal coil failure or mechanical wear
• Damaged wiring harness near the hydraulic pump area, particularly where cables rub against the frame or rotating components
• Corroded or loose electrical connectors at the solenoid valve or ECM connection points
• Short circuit to ground caused by chafed insulation exposing bare wires
• ECM internal fault affecting the solenoid driver circuit (less common but possible in older machines)
• Low voltage supply from deteriorated battery cables or poor ground connections

How to Troubleshoot and Fix Code P260

Step 1: Visual Inspection Begin by inspecting the hydraulic pump solenoid and its wiring harness for obvious damage. On used excavators, check for cable wear at known rub points near the pump mounting area, corrosion on connector terminals, and oil contamination that may have degraded wire insulation.

Step 2: Electrical Testing Using a digital multimeter, measure resistance across the solenoid coil terminals (typically 3-8 ohms for Sany models). Check for voltage supply at the connector with the key on—should read approximately 12-24V depending on your model. Test for continuity between the ECM and solenoid connector, ensuring no open circuits exist.

Step 3: Component Testing and Replacement If wiring checks pass, swap the solenoid valve with a known-good unit or test the existing solenoid's response using Sany diagnostic software (PC Suite). Clear codes after repairs and perform a function test under load. For used machines, always apply dielectric grease to connectors during reassembly to prevent future corrosion.

Disclaimer: This guide provides general troubleshooting information. Always consult the official Sany service manual for your specific model and consider professional diagnostic assistance for complex electrical issues.