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Machinery Troubleshooting Insights

How to Identify a Failing Hydraulic Pump in a Komatsu Excavator?

A failing hydraulic pump often presents with distinct symptoms. Key indicators include: 1. **Slow Operation:** The machine's movements become sluggish, especially under load. 2. **Excessive Noise:** A whining or grinding sound coming from the pump area, which often changes pitch with engine RPM. 3. **High Oil Temperature:** The hydraulic oil quickly overheats. 4. **Drifting/Creeping:** Cylinders or motors may fail to hold position. To confirm, use a hydraulic pressure testing gauge kit to check system pressure against OEM specifications. Low or fluctuating pressure indicates an internal leak or component wear within the pump.

Komatsu PC200-7 Excavator Travel Weakness Diagnosis & Solution (小松PC200-7挖掘机行走无力故障诊断与解决方案)

Diagnosis: Travel weakness (行走无力) in a PC200-7 can stem from several issues: main pump pressure loss, blocked travel motor pilot line, faulty travel solenoid valve, or a worn-out travel motor swash plate/rotating group. First, check the pressure of the main pump's travel circuit and the pilot pressure at the travel spool. If pressures are normal, inspect the travel motor's check valve and relief valve for contamination or broken springs.
Solution: If the pilot pressure is low, replace the corresponding travel solenoid (often mounted on the main control valve). If the main pump pressure is low only on the travel circuit, the load sensing (LS) valve or its pilot lines may be blocked. If all external factors are ruled out, a **travel motor overhaul** is required, focusing on replacing the piston shoe, cylinder block, and high-quality seals like the hydraulic cylinder seal kit 80/45.

Expert Knowledge & Best Practices

1. Hydraulic Contamination: Always replace the **Hydraulic Filter (FOH-2114)** when changing the pump or performing major hydraulic repairs. Contamination is the #1 cause of hydraulic component failure.
2. Troubleshooting Solenoids: If an engine fails to shut off or won't start (like with the Yanmar VDC12 Shut-off Solenoid 119653-77950), test the resistance across the solenoid's coils. An open circuit usually means replacement is necessary.
3. Identifying Alternator Diode Failure: If your battery consistently drains or overcharges, components like the Yanmar 4TNV98 Diode 119643-66900 may be compromised, requiring the replacement of the rectifier assembly.