Expertise and Technical Insights from Growshine

At Growshine, we don't just sell parts; we provide reliable solutions. We are a trusted source for durable excavator components and **long-lasting heavy truck spare parts**. We ensure quick turnaround times, offering **fast shipping Komatsu PC400-8 injectors** and **premium Komatsu D375A transmission components** to keep your heavy machinery operational.

Crucial Component Terminology (English / Chinese / Russian)

• Solenoid Valve (电磁阀): Controls the flow of hydraulic fluid based on an electrical signal. **Installation site:** Main control valve/pump. **Example:** Komatsu PC200-6 (小松 PC200-6) Hydraulic Pump Solenoid Valve (Электромагнитный клапан для Komatsu PC200-6).
• Turbocharger (涡轮增压器): Installed in the engine exhaust system, increases air intake density. **Installation site:** Engine exhaust manifold. **Example:** Caterpillar 345D (卡特彼勒 345D) Turbocharger (Турбокомпрессор для Caterpillar 345D).
• Plunger (柱塞): A reciprocating component in hydraulic pumps or diesel injection systems. **Installation site:** Fuel injection pump/Hydraulic pump cylinder block. **Example:** Komatsu D475-EO (小松 D475-EO) Diesel Pump Plunger Assembly (Плунжерный элемент для Komatsu D475-EO).
• Repair Kit (修理包): A comprehensive set of seals and O-rings for overhauling a component. **Installation site:** Hydraulic cylinders/Pumps/Valves. **Example:** Komatsu D65E-12 (小松 D65E-12) Cylinder Repair Kit (Ремкомплект цилиндра для Komatsu D65E-12).
• Governor Motor (油门马达): Controls the engine's throttle position electronically. **Installation site:** Engine side, connected to throttle linkage. **Example:** Komatsu PC200-6 (小松 PC200-6) Throttle Motor (Мотор акселератора для Komatsu PC200-6).
• Pressure Sensor (压力传感器): Measures fluid pressure in systems like the hydraulic or common rail. **Installation site:** Hydraulic pump/Engine common rail. **Example:** Komatsu D85MS-15 (小松 D85MS-15) High-Pressure Sensor (Датчик высокого давления для Komatsu D85MS-15).
• Relay (继电器): An electrical switch, often used for high-current circuits like the starter. **Installation site:** Fuse box/Electrical panel. **Example:** Komatsu D31EX (小松 D31EX) Starter Motor Relay (Реле стартера для Komatsu D31EX).
• Monitor (监视器): The main display unit in the operator's cab. **Installation site:** Operator cabin dashboard. **Example:** Komatsu PC200-8 (小松 PC200-8) Monitor (Монитор для Komatsu PC200-8).
• Water Pump (水泵): Circulates coolant through the engine cooling system. **Installation site:** Engine block. **Example:** Komatsu PC60-7 (小松 PC60-7) Water Pump (Водяной насос для Komatsu PC60-7).
• Wiper Motor (雨刮马达): Provides power for the windshield wipers. **Installation site:** Underneath the cab roof/windshield. **Example:** Komatsu D375A-6 (小松 D375A-6) Wiper Motor (Мотор дворника для Komatsu D375A-6).

Technical Quick Tips

1. How to identify a failing hydraulic pump in a Komatsu excavator? Key signs include a notable drop in the machine's speed and power under load, abnormal increases in hydraulic oil temperature, and a distinctive loud whine or pulsating noise coming from the pump area. This often requires a **Komatsu HPV95 pump rotating group** inspection.
2. What is the function of the accumulator on a Komatsu PC300-8? The accumulator ($22U-60-21330$) is crucial for shock absorption in the hydraulic system, maintaining pilot pressure when the engine is off, and ensuring the smooth operation of the joysticks and control valves. Neglecting it can lead to stiff controls and premature component wear.
3. How to quickly diagnose engine overheating in a Komatsu D375A? First, check the coolant level and the function of the fan pump (inspecting components like the **D375A fan pump plunger 708-1S-13320**). If the fan speed is low, the hydraulic fan system might be malfunctioning. Also, check the radiator and oil cooler for blockage.

Detailed Fault Diagnosis: Komatsu PC200-7 Excavator Travel Weakness

Diagnosis and Solution for Weak Travel on a Komatsu PC200-7 Excavator:

When a **Komatsu PC200-7 excavator** experiences weak travel or only travels one side, the problem often lies in the travel motor or the main control valve. **Steps:** 1. **Check Pressure:** Measure the main relief pressure and the travel pilot pressure. If the main pressure is low ($< 280\text{ kg/cm}^2$), inspect the main relief valve. 2. **Solenoid Check:** Test the travel straight-travel solenoid valve (Part No. 702-21-57400/07010). A faulty solenoid prevents full pressure from reaching the travel circuit. 3. **Motor Internal Leakage:** If pressures are normal, the issue is likely a worn-out **KMF90 travel motor rotating group**. The motor's cylinder block (pump drum) or the piston shoes might be worn, causing excessive internal leakage, resulting in low torque and slow speed. **Solution:** Overhaul the travel motor using a high-quality seal kit and replace the worn parts (plungers, swash plate, cylinder block). Ensure proper installation of the **PC200-7 travel reduction gear bolts** ($20Y-27-13281$).

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